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ruby--ruby/ext/zlib/zlib.c
nobu 778796b008 * ext/zlib/zlib.c: take care of platforms where long is bigger 
than int.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@30445 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2011-01-01 02:10:30 +00:00

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/*
* zlib.c - An interface for zlib.
*
* Copyright (C) UENO Katsuhiro 2000-2003
*
* $Id$
*/
#include <ruby.h>
#include <zlib.h>
#include <time.h>
#include <ruby/io.h>
#ifdef HAVE_VALGRIND_MEMCHECK_H
# include <valgrind/memcheck.h>
# ifndef VALGRIND_MAKE_MEM_DEFINED
# define VALGRIND_MAKE_MEM_DEFINED(p, n) VALGRIND_MAKE_READABLE(p, n)
# endif
# ifndef VALGRIND_MAKE_MEM_UNDEFINED
# define VALGRIND_MAKE_MEM_UNDEFINED(p, n) VALGRIND_MAKE_WRITABLE(p, n)
# endif
#else
# define VALGRIND_MAKE_MEM_DEFINED(p, n) /* empty */
# define VALGRIND_MAKE_MEM_UNDEFINED(p, n) /* empty */
#endif
#define RUBY_ZLIB_VERSION "0.6.0"
#define OBJ_IS_FREED(val) (RBASIC(val)->flags == 0)
#ifndef GZIP_SUPPORT
#define GZIP_SUPPORT 1
#endif
/* from zutil.h */
#ifndef DEF_MEM_LEVEL
#if MAX_MEM_LEVEL >= 8
#define DEF_MEM_LEVEL 8
#else
#define DEF_MEM_LEVEL MAX_MEM_LEVEL
#endif
#endif
#if SIZEOF_LONG > SIZEOF_INT
static inline uInt
max_uint(long n)
{
if (n > UINT_MAX) n = UINT_MAX;
return (uInt)n;
}
#define MAX_UINT(n) max_uint(n)
#else
#define MAX_UINT(n) (uInt)(n)
#endif
#define sizeof(x) ((int)sizeof(x))
/*--------- Prototypes --------*/
static NORETURN(void raise_zlib_error(int, const char*));
static VALUE rb_zlib_version(VALUE);
static VALUE do_checksum(int, VALUE*, uLong (*)(uLong, const Bytef*, uInt));
static VALUE rb_zlib_adler32(int, VALUE*, VALUE);
static VALUE rb_zlib_crc32(int, VALUE*, VALUE);
static VALUE rb_zlib_crc_table(VALUE);
static voidpf zlib_mem_alloc(voidpf, uInt, uInt);
static void zlib_mem_free(voidpf, voidpf);
static void finalizer_warn(const char*);
struct zstream;
struct zstream_funcs;
static void zstream_init(struct zstream*, const struct zstream_funcs*);
static void zstream_expand_buffer(struct zstream*);
static void zstream_expand_buffer_into(struct zstream*, unsigned long);
static void zstream_append_buffer(struct zstream*, const Bytef*, long);
static VALUE zstream_detach_buffer(struct zstream*);
static VALUE zstream_shift_buffer(struct zstream*, long);
static void zstream_buffer_ungets(struct zstream*, const Bytef*, unsigned long);
static void zstream_buffer_ungetbyte(struct zstream*, int);
static void zstream_append_input(struct zstream*, const Bytef*, long);
static void zstream_discard_input(struct zstream*, long);
static void zstream_reset_input(struct zstream*);
static void zstream_passthrough_input(struct zstream*);
static VALUE zstream_detach_input(struct zstream*);
static void zstream_reset(struct zstream*);
static VALUE zstream_end(struct zstream*);
static void zstream_run(struct zstream*, Bytef*, long, int);
static VALUE zstream_sync(struct zstream*, Bytef*, long);
static void zstream_mark(struct zstream*);
static void zstream_free(struct zstream*);
static VALUE zstream_new(VALUE, const struct zstream_funcs*);
static struct zstream *get_zstream(VALUE);
static void zstream_finalize(struct zstream*);
static VALUE rb_zstream_end(VALUE);
static VALUE rb_zstream_reset(VALUE);
static VALUE rb_zstream_finish(VALUE);
static VALUE rb_zstream_flush_next_in(VALUE);
static VALUE rb_zstream_flush_next_out(VALUE);
static VALUE rb_zstream_avail_out(VALUE);
static VALUE rb_zstream_set_avail_out(VALUE, VALUE);
static VALUE rb_zstream_avail_in(VALUE);
static VALUE rb_zstream_total_in(VALUE);
static VALUE rb_zstream_total_out(VALUE);
static VALUE rb_zstream_data_type(VALUE);
static VALUE rb_zstream_adler(VALUE);
static VALUE rb_zstream_finished_p(VALUE);
static VALUE rb_zstream_closed_p(VALUE);
static VALUE rb_deflate_s_allocate(VALUE);
static VALUE rb_deflate_initialize(int, VALUE*, VALUE);
static VALUE rb_deflate_init_copy(VALUE, VALUE);
static VALUE deflate_run(VALUE);
static VALUE rb_deflate_s_deflate(int, VALUE*, VALUE);
static void do_deflate(struct zstream*, VALUE, int);
static VALUE rb_deflate_deflate(int, VALUE*, VALUE);
static VALUE rb_deflate_addstr(VALUE, VALUE);
static VALUE rb_deflate_flush(int, VALUE*, VALUE);
static VALUE rb_deflate_params(VALUE, VALUE, VALUE);
static VALUE rb_deflate_set_dictionary(VALUE, VALUE);
static VALUE inflate_run(VALUE);
static VALUE rb_inflate_s_allocate(VALUE);
static VALUE rb_inflate_initialize(int, VALUE*, VALUE);
static VALUE rb_inflate_s_inflate(VALUE, VALUE);
static void do_inflate(struct zstream*, VALUE);
static VALUE rb_inflate_inflate(VALUE, VALUE);
static VALUE rb_inflate_addstr(VALUE, VALUE);
static VALUE rb_inflate_sync(VALUE, VALUE);
static VALUE rb_inflate_sync_point_p(VALUE);
static VALUE rb_inflate_set_dictionary(VALUE, VALUE);
#if GZIP_SUPPORT
struct gzfile;
static void gzfile_mark(struct gzfile*);
static void gzfile_free(struct gzfile*);
static VALUE gzfile_new(VALUE, const struct zstream_funcs*, void (*) _((struct gzfile*)));
static void gzfile_reset(struct gzfile*);
static void gzfile_close(struct gzfile*, int);
static void gzfile_write_raw(struct gzfile*);
static VALUE gzfile_read_raw_partial(VALUE);
static VALUE gzfile_read_raw_rescue(VALUE);
static VALUE gzfile_read_raw(struct gzfile*);
static int gzfile_read_raw_ensure(struct gzfile*, long);
static char *gzfile_read_raw_until_zero(struct gzfile*, long);
static unsigned int gzfile_get16(const unsigned char*);
static unsigned long gzfile_get32(const unsigned char*);
static void gzfile_set32(unsigned long n, unsigned char*);
static void gzfile_make_header(struct gzfile*);
static void gzfile_make_footer(struct gzfile*);
static void gzfile_read_header(struct gzfile*);
static void gzfile_check_footer(struct gzfile*);
static void gzfile_write(struct gzfile*, Bytef*, long);
static long gzfile_read_more(struct gzfile*);
static void gzfile_calc_crc(struct gzfile*, VALUE);
static VALUE gzfile_read(struct gzfile*, long);
static VALUE gzfile_read_all(struct gzfile*);
static void gzfile_ungets(struct gzfile*, const Bytef*, long);
static void gzfile_ungetbyte(struct gzfile*, int);
static VALUE gzfile_writer_end_run(VALUE);
static void gzfile_writer_end(struct gzfile*);
static VALUE gzfile_reader_end_run(VALUE);
static void gzfile_reader_end(struct gzfile*);
static void gzfile_reader_rewind(struct gzfile*);
static VALUE gzfile_reader_get_unused(struct gzfile*);
static struct gzfile *get_gzfile(VALUE);
static VALUE gzfile_ensure_close(VALUE);
static VALUE rb_gzfile_s_wrap(int, VALUE*, VALUE);
static VALUE gzfile_s_open(int, VALUE*, VALUE, const char*);
NORETURN(static void gzfile_raise(struct gzfile *, VALUE, const char *));
static VALUE gzfile_error_inspect(VALUE);
static VALUE rb_gzfile_to_io(VALUE);
static VALUE rb_gzfile_crc(VALUE);
static VALUE rb_gzfile_mtime(VALUE);
static VALUE rb_gzfile_level(VALUE);
static VALUE rb_gzfile_os_code(VALUE);
static VALUE rb_gzfile_orig_name(VALUE);
static VALUE rb_gzfile_comment(VALUE);
static VALUE rb_gzfile_lineno(VALUE);
static VALUE rb_gzfile_set_lineno(VALUE, VALUE);
static VALUE rb_gzfile_set_mtime(VALUE, VALUE);
static VALUE rb_gzfile_set_orig_name(VALUE, VALUE);
static VALUE rb_gzfile_set_comment(VALUE, VALUE);
static VALUE rb_gzfile_close(VALUE);
static VALUE rb_gzfile_finish(VALUE);
static VALUE rb_gzfile_closed_p(VALUE);
static VALUE rb_gzfile_eof_p(VALUE);
static VALUE rb_gzfile_sync(VALUE);
static VALUE rb_gzfile_set_sync(VALUE, VALUE);
static VALUE rb_gzfile_total_in(VALUE);
static VALUE rb_gzfile_total_out(VALUE);
static VALUE rb_gzfile_path(VALUE);
static VALUE rb_gzwriter_s_allocate(VALUE);
static VALUE rb_gzwriter_s_open(int, VALUE*, VALUE);
static VALUE rb_gzwriter_initialize(int, VALUE*, VALUE);
static VALUE rb_gzwriter_flush(int, VALUE*, VALUE);
static VALUE rb_gzwriter_write(VALUE, VALUE);
static VALUE rb_gzwriter_putc(VALUE, VALUE);
static VALUE rb_gzreader_s_allocate(VALUE);
static VALUE rb_gzreader_s_open(int, VALUE*, VALUE);
static VALUE rb_gzreader_initialize(int, VALUE*, VALUE);
static VALUE rb_gzreader_rewind(VALUE);
static VALUE rb_gzreader_unused(VALUE);
static VALUE rb_gzreader_read(int, VALUE*, VALUE);
static VALUE rb_gzreader_getc(VALUE);
static VALUE rb_gzreader_readchar(VALUE);
static VALUE rb_gzreader_each_byte(VALUE);
static VALUE rb_gzreader_ungetc(VALUE, VALUE);
static VALUE rb_gzreader_ungetbyte(VALUE, VALUE);
static void gzreader_skip_linebreaks(struct gzfile*);
static VALUE gzreader_gets(int, VALUE*, VALUE);
static VALUE rb_gzreader_gets(int, VALUE*, VALUE);
static VALUE rb_gzreader_readline(int, VALUE*, VALUE);
static VALUE rb_gzreader_each(int, VALUE*, VALUE);
static VALUE rb_gzreader_readlines(int, VALUE*, VALUE);
#endif /* GZIP_SUPPORT */
void Init_zlib(void);
/*--------- Exceptions --------*/
static VALUE cZError, cStreamEnd, cNeedDict;
static VALUE cStreamError, cDataError, cMemError, cBufError, cVersionError;
static void
raise_zlib_error(int err, const char *msg)
{
VALUE exc;
if (!msg) {
msg = zError(err);
}
switch(err) {
case Z_STREAM_END:
exc = rb_exc_new2(cStreamEnd, msg);
break;
case Z_NEED_DICT:
exc = rb_exc_new2(cNeedDict, msg);
break;
case Z_STREAM_ERROR:
exc = rb_exc_new2(cStreamError, msg);
break;
case Z_DATA_ERROR:
exc = rb_exc_new2(cDataError, msg);
break;
case Z_BUF_ERROR:
exc = rb_exc_new2(cBufError, msg);
break;
case Z_VERSION_ERROR:
exc = rb_exc_new2(cVersionError, msg);
break;
case Z_MEM_ERROR:
exc = rb_exc_new2(cMemError, msg);
break;
case Z_ERRNO:
rb_sys_fail(msg);
/* no return */
default:
{
char buf[BUFSIZ];
snprintf(buf, BUFSIZ, "unknown zlib error %d: %s", err, msg);
exc = rb_exc_new2(cZError, buf);
}
}
rb_exc_raise(exc);
}
/*--- Warning (in finalizer) ---*/
static void
finalizer_warn(const char *msg)
{
fprintf(stderr, "zlib(finalizer): %s\n", msg);
}
/*-------- module Zlib --------*/
/*
* Returns the string which represents the version of zlib library.
*/
static VALUE
rb_zlib_version(VALUE klass)
{
VALUE str;
str = rb_str_new2(zlibVersion());
OBJ_TAINT(str); /* for safe */
return str;
}
#if SIZEOF_LONG > SIZEOF_INT
static uLong
checksum_long(uLong (*func)(uLong, const Bytef*, uInt), uLong sum, const Bytef *ptr, long len)
{
if (len > UINT_MAX) {
do {
sum = func(sum, ptr, UINT_MAX);
ptr += UINT_MAX;
len -= UINT_MAX;
} while (len >= UINT_MAX);
}
if (len > 0) sum = func(sum, ptr, (uInt)len);
return sum;
}
#else
#define checksum_long(func, sum, ptr, len) (func)((sum), (ptr), (len))
#endif
static VALUE
do_checksum(argc, argv, func)
int argc;
VALUE *argv;
uLong (*func)(uLong, const Bytef*, uInt);
{
VALUE str, vsum;
unsigned long sum;
rb_scan_args(argc, argv, "02", &str, &vsum);
if (!NIL_P(vsum)) {
sum = NUM2ULONG(vsum);
}
else if (NIL_P(str)) {
sum = 0;
}
else {
sum = func(0, Z_NULL, 0);
}
if (NIL_P(str)) {
sum = func(sum, Z_NULL, 0);
}
else {
StringValue(str);
sum = checksum_long(func, sum, (Bytef*)RSTRING_PTR(str), RSTRING_LEN(str));
}
return rb_uint2inum(sum);
}
/*
* call-seq: Zlib.adler32(string, adler)
*
* Calculates Adler-32 checksum for +string+, and returns updated value of
* +adler+. If +string+ is omitted, it returns the Adler-32 initial value. If
* +adler+ is omitted, it assumes that the initial value is given to +adler+.
*
* FIXME: expression.
*/
static VALUE
rb_zlib_adler32(int argc, VALUE *argv, VALUE klass)
{
return do_checksum(argc, argv, adler32);
}
#ifdef HAVE_ADLER32_COMBINE
/*
* call-seq: Zlib.adler32_combine(adler1, adler2, len2)
*
* Combine two Adler-32 check values in to one. +alder1+ is the first Adler-32
* value, +adler2+ is the second Adler-32 value. +len2+ is the length of the
* string used to generate +adler2+.
*
*/
static VALUE
rb_zlib_adler32_combine(VALUE klass, VALUE adler1, VALUE adler2, VALUE len2)
{
return ULONG2NUM(
adler32_combine(NUM2ULONG(adler1), NUM2ULONG(adler2), NUM2LONG(len2)));
}
#else
#define rb_zlib_adler32_combine rb_f_notimplement
#endif
/*
* call-seq: Zlib.crc32(string, adler)
*
* Calculates CRC checksum for +string+, and returns updated value of +crc+. If
* +string+ is omitted, it returns the CRC initial value. If +crc+ is omitted, it
* assumes that the initial value is given to +crc+.
*
* FIXME: expression.
*/
static VALUE
rb_zlib_crc32(int argc, VALUE *argv, VALUE klass)
{
return do_checksum(argc, argv, crc32);
}
#ifdef HAVE_CRC32_COMBINE
/*
* call-seq: Zlib.crc32_combine(crc1, crc2, len2)
*
* Combine two CRC-32 check values in to one. +crc1+ is the first CRC-32
* value, +crc2+ is the second CRC-32 value. +len2+ is the length of the
* string used to generate +crc2+.
*
*/
static VALUE
rb_zlib_crc32_combine(VALUE klass, VALUE crc1, VALUE crc2, VALUE len2)
{
return ULONG2NUM(
crc32_combine(NUM2ULONG(crc1), NUM2ULONG(crc2), NUM2LONG(len2)));
}
#else
#define rb_zlib_crc32_combine rb_f_notimplement
#endif
/*
* Returns the table for calculating CRC checksum as an array.
*/
static VALUE
rb_zlib_crc_table(VALUE obj)
{
const unsigned long *crctbl;
VALUE dst;
int i;
crctbl = get_crc_table();
dst = rb_ary_new2(256);
for (i = 0; i < 256; i++) {
rb_ary_push(dst, rb_uint2inum(crctbl[i]));
}
return dst;
}
/*-------- zstream - internal APIs --------*/
struct zstream {
unsigned long flags;
VALUE buf;
long buf_filled;
VALUE input;
z_stream stream;
const struct zstream_funcs {
int (*reset)(z_streamp);
int (*end)(z_streamp);
int (*run)(z_streamp, int);
} *func;
};
#define ZSTREAM_FLAG_READY 0x1
#define ZSTREAM_FLAG_IN_STREAM 0x2
#define ZSTREAM_FLAG_FINISHED 0x4
#define ZSTREAM_FLAG_CLOSING 0x8
#define ZSTREAM_FLAG_UNUSED 0x10
#define ZSTREAM_READY(z) ((z)->flags |= ZSTREAM_FLAG_READY)
#define ZSTREAM_IS_READY(z) ((z)->flags & ZSTREAM_FLAG_READY)
#define ZSTREAM_IS_FINISHED(z) ((z)->flags & ZSTREAM_FLAG_FINISHED)
#define ZSTREAM_IS_CLOSING(z) ((z)->flags & ZSTREAM_FLAG_CLOSING)
/* I think that more better value should be found,
but I gave up finding it. B) */
#define ZSTREAM_INITIAL_BUFSIZE 1024
#define ZSTREAM_AVAIL_OUT_STEP_MAX 16384
#define ZSTREAM_AVAIL_OUT_STEP_MIN 2048
static const struct zstream_funcs deflate_funcs = {
deflateReset, deflateEnd, deflate,
};
static const struct zstream_funcs inflate_funcs = {
inflateReset, inflateEnd, inflate,
};
static voidpf
zlib_mem_alloc(voidpf opaque, uInt items, uInt size)
{
voidpf p = xmalloc(items * size);
/* zlib FAQ: Valgrind (or some similar memory access checker) says that
deflate is performing a conditional jump that depends on an
uninitialized value. Isn't that a bug?
http://www.zlib.net/zlib_faq.html#faq36 */
VALGRIND_MAKE_MEM_DEFINED(p, items * size);
return p;
}
static void
zlib_mem_free(voidpf opaque, voidpf address)
{
xfree(address);
}
static void
zstream_init(struct zstream *z, const struct zstream_funcs *func)
{
z->flags = 0;
z->buf = Qnil;
z->buf_filled = 0;
z->input = Qnil;
z->stream.zalloc = zlib_mem_alloc;
z->stream.zfree = zlib_mem_free;
z->stream.opaque = Z_NULL;
z->stream.msg = Z_NULL;
z->stream.next_in = Z_NULL;
z->stream.avail_in = 0;
z->stream.next_out = Z_NULL;
z->stream.avail_out = 0;
z->func = func;
}
#define zstream_init_deflate(z) zstream_init((z), &deflate_funcs)
#define zstream_init_inflate(z) zstream_init((z), &inflate_funcs)
static void
zstream_expand_buffer(struct zstream *z)
{
long inc;
if (NIL_P(z->buf)) {
/* I uses rb_str_new here not rb_str_buf_new because
rb_str_buf_new makes a zero-length string. */
z->buf = rb_str_new(0, ZSTREAM_INITIAL_BUFSIZE);
z->buf_filled = 0;
z->stream.next_out = (Bytef*)RSTRING_PTR(z->buf);
z->stream.avail_out = ZSTREAM_INITIAL_BUFSIZE;
RBASIC(z->buf)->klass = 0;
return;
}
if (RSTRING_LEN(z->buf) - z->buf_filled >= ZSTREAM_AVAIL_OUT_STEP_MAX) {
/* to keep other threads from freezing */
z->stream.avail_out = ZSTREAM_AVAIL_OUT_STEP_MAX;
}
else {
inc = z->buf_filled / 2;
if (inc < ZSTREAM_AVAIL_OUT_STEP_MIN) {
inc = ZSTREAM_AVAIL_OUT_STEP_MIN;
}
rb_str_resize(z->buf, z->buf_filled + inc);
z->stream.avail_out = (inc < ZSTREAM_AVAIL_OUT_STEP_MAX) ?
(int)inc : ZSTREAM_AVAIL_OUT_STEP_MAX;
}
z->stream.next_out = (Bytef*)RSTRING_PTR(z->buf) + z->buf_filled;
}
static void
zstream_expand_buffer_into(struct zstream *z, unsigned long size)
{
if (NIL_P(z->buf)) {
/* I uses rb_str_new here not rb_str_buf_new because
rb_str_buf_new makes a zero-length string. */
z->buf = rb_str_new(0, size);
z->buf_filled = 0;
z->stream.next_out = (Bytef*)RSTRING_PTR(z->buf);
z->stream.avail_out = MAX_UINT(size);
RBASIC(z->buf)->klass = 0;
}
else if (z->stream.avail_out != size) {
rb_str_resize(z->buf, z->buf_filled + size);
z->stream.next_out = (Bytef*)RSTRING_PTR(z->buf) + z->buf_filled;
z->stream.avail_out = MAX_UINT(size);
}
}
static void
zstream_append_buffer(struct zstream *z, const Bytef *src, long len)
{
if (NIL_P(z->buf)) {
z->buf = rb_str_buf_new(len);
rb_str_buf_cat(z->buf, (const char*)src, len);
z->buf_filled = len;
z->stream.next_out = (Bytef*)RSTRING_PTR(z->buf);
z->stream.avail_out = 0;
RBASIC(z->buf)->klass = 0;
return;
}
if (RSTRING_LEN(z->buf) < z->buf_filled + len) {
rb_str_resize(z->buf, z->buf_filled + len);
z->stream.avail_out = 0;
}
else {
if (z->stream.avail_out >= (uInt)len) {
z->stream.avail_out -= (uInt)len;
}
else {
z->stream.avail_out = 0;
}
}
memcpy(RSTRING_PTR(z->buf) + z->buf_filled, src, len);
z->buf_filled += len;
z->stream.next_out = (Bytef*)RSTRING_PTR(z->buf) + z->buf_filled;
}
#define zstream_append_buffer2(z,v) \
zstream_append_buffer((z),(Bytef*)RSTRING_PTR(v),RSTRING_LEN(v))
static VALUE
zstream_detach_buffer(struct zstream *z)
{
VALUE dst;
if (NIL_P(z->buf)) {
dst = rb_str_new(0, 0);
}
else {
dst = z->buf;
rb_str_resize(dst, z->buf_filled);
RBASIC(dst)->klass = rb_cString;
}
z->buf = Qnil;
z->buf_filled = 0;
z->stream.next_out = 0;
z->stream.avail_out = 0;
return dst;
}
static VALUE
zstream_shift_buffer(struct zstream *z, long len)
{
VALUE dst;
long buflen;
if (z->buf_filled <= len) {
return zstream_detach_buffer(z);
}
dst = rb_str_subseq(z->buf, 0, len);
RBASIC(dst)->klass = rb_cString;
z->buf_filled -= len;
memmove(RSTRING_PTR(z->buf), RSTRING_PTR(z->buf) + len,
z->buf_filled);
z->stream.next_out = (Bytef*)RSTRING_PTR(z->buf) + z->buf_filled;
buflen = RSTRING_LEN(z->buf) - z->buf_filled;
if (buflen > ZSTREAM_AVAIL_OUT_STEP_MAX) {
buflen = ZSTREAM_AVAIL_OUT_STEP_MAX;
}
z->stream.avail_out = (uInt)buflen;
return dst;
}
static void
zstream_buffer_ungets(struct zstream *z, const Bytef *b, unsigned long len)
{
if (NIL_P(z->buf) || RSTRING_LEN(z->buf) - z->buf_filled == 0) {
zstream_expand_buffer_into(z, len);
}
memmove(RSTRING_PTR(z->buf) + len, RSTRING_PTR(z->buf), z->buf_filled);
memmove(RSTRING_PTR(z->buf), b, len);
z->buf_filled+=len;
if (z->stream.avail_out > 0) {
if (len > z->stream.avail_out) len = z->stream.avail_out;
z->stream.next_out+=len;
z->stream.avail_out-=(uInt)len;
}
}
static void
zstream_buffer_ungetbyte(struct zstream *z, int c)
{
if (NIL_P(z->buf) || RSTRING_LEN(z->buf) - z->buf_filled == 0) {
zstream_expand_buffer(z);
}
memmove(RSTRING_PTR(z->buf) + 1, RSTRING_PTR(z->buf), z->buf_filled);
RSTRING_PTR(z->buf)[0] = (char)c;
z->buf_filled++;
if (z->stream.avail_out > 0) {
z->stream.next_out++;
z->stream.avail_out--;
}
}
static void
zstream_append_input(struct zstream *z, const Bytef *src, long len)
{
if (len <= 0) return;
if (NIL_P(z->input)) {
z->input = rb_str_buf_new(len);
rb_str_buf_cat(z->input, (const char*)src, len);
RBASIC(z->input)->klass = 0;
}
else {
rb_str_buf_cat(z->input, (const char*)src, len);
}
}
#define zstream_append_input2(z,v)\
RB_GC_GUARD(v),\
zstream_append_input((z), (Bytef*)RSTRING_PTR(v), RSTRING_LEN(v))
static void
zstream_discard_input(struct zstream *z, long len)
{
if (NIL_P(z->input) || RSTRING_LEN(z->input) <= len) {
z->input = Qnil;
}
else {
memmove(RSTRING_PTR(z->input), RSTRING_PTR(z->input) + len,
RSTRING_LEN(z->input) - len);
rb_str_resize(z->input, RSTRING_LEN(z->input) - len);
}
}
static void
zstream_reset_input(struct zstream *z)
{
z->input = Qnil;
}
static void
zstream_passthrough_input(struct zstream *z)
{
if (!NIL_P(z->input)) {
zstream_append_buffer2(z, z->input);
z->input = Qnil;
}
}
static VALUE
zstream_detach_input(struct zstream *z)
{
VALUE dst;
if (NIL_P(z->input)) {
dst = rb_str_new(0, 0);
}
else {
dst = z->input;
RBASIC(dst)->klass = rb_cString;
}
z->input = Qnil;
RBASIC(dst)->klass = rb_cString;
return dst;
}
static void
zstream_reset(struct zstream *z)
{
int err;
err = z->func->reset(&z->stream);
if (err != Z_OK) {
raise_zlib_error(err, z->stream.msg);
}
z->flags = ZSTREAM_FLAG_READY;
z->buf = Qnil;
z->buf_filled = 0;
z->stream.next_out = 0;
z->stream.avail_out = 0;
zstream_reset_input(z);
}
static VALUE
zstream_end(struct zstream *z)
{
int err;
if (!ZSTREAM_IS_READY(z)) {
rb_warning("attempt to close uninitialized zstream; ignored.");
return Qnil;
}
if (z->flags & ZSTREAM_FLAG_IN_STREAM) {
rb_warning("attempt to close unfinished zstream; reset forced.");
zstream_reset(z);
}
zstream_reset_input(z);
err = z->func->end(&z->stream);
if (err != Z_OK) {
raise_zlib_error(err, z->stream.msg);
}
z->flags = 0;
return Qnil;
}
static void
zstream_run(struct zstream *z, Bytef *src, long len, int flush)
{
uInt n;
int err;
volatile VALUE guard = Qnil;
if (NIL_P(z->input) && len == 0) {
z->stream.next_in = (Bytef*)"";
z->stream.avail_in = 0;
}
else {
zstream_append_input(z, src, len);
z->stream.next_in = (Bytef*)RSTRING_PTR(z->input);
z->stream.avail_in = MAX_UINT(RSTRING_LEN(z->input));
/* keep reference to `z->input' so as not to be garbage collected
after zstream_reset_input() and prevent `z->stream.next_in'
from dangling. */
guard = z->input;
}
if (z->stream.avail_out == 0) {
zstream_expand_buffer(z);
}
for (;;) {
/* VC allocates err and guard to same address. accessing err and guard
in same scope prevents it. */
RB_GC_GUARD(guard);
n = z->stream.avail_out;
err = z->func->run(&z->stream, flush);
z->buf_filled += n - z->stream.avail_out;
rb_thread_schedule();
if (err == Z_STREAM_END) {
z->flags &= ~ZSTREAM_FLAG_IN_STREAM;
z->flags |= ZSTREAM_FLAG_FINISHED;
break;
}
if (err != Z_OK) {
if (flush != Z_FINISH && err == Z_BUF_ERROR
&& z->stream.avail_out > 0) {
z->flags |= ZSTREAM_FLAG_IN_STREAM;
break;
}
zstream_reset_input(z);
if (z->stream.avail_in > 0) {
zstream_append_input(z, z->stream.next_in, z->stream.avail_in);
}
raise_zlib_error(err, z->stream.msg);
}
if (z->stream.avail_out > 0) {
z->flags |= ZSTREAM_FLAG_IN_STREAM;
break;
}
zstream_expand_buffer(z);
}
zstream_reset_input(z);
if (z->stream.avail_in > 0) {
zstream_append_input(z, z->stream.next_in, z->stream.avail_in);
guard = Qnil; /* prevent tail call to make guard effective */
}
}
static VALUE
zstream_sync(struct zstream *z, Bytef *src, long len)
{
VALUE rest;
int err;
if (!NIL_P(z->input)) {
z->stream.next_in = (Bytef*)RSTRING_PTR(z->input);
z->stream.avail_in = MAX_UINT(RSTRING_LEN(z->input));
err = inflateSync(&z->stream);
if (err == Z_OK) {
zstream_discard_input(z,
RSTRING_LEN(z->input) - z->stream.avail_in);
zstream_append_input(z, src, len);
return Qtrue;
}
zstream_reset_input(z);
if (err != Z_DATA_ERROR) {
rest = rb_str_new((char*)z->stream.next_in, z->stream.avail_in);
raise_zlib_error(err, z->stream.msg);
}
}
if (len <= 0) return Qfalse;
z->stream.next_in = src;
z->stream.avail_in = MAX_UINT(len);
err = inflateSync(&z->stream);
if (err == Z_OK) {
zstream_append_input(z, z->stream.next_in, z->stream.avail_in);
return Qtrue;
}
if (err != Z_DATA_ERROR) {
rest = rb_str_new((char*)z->stream.next_in, z->stream.avail_in);
raise_zlib_error(err, z->stream.msg);
}
return Qfalse;
}
static void
zstream_mark(struct zstream *z)
{
rb_gc_mark(z->buf);
rb_gc_mark(z->input);
}
static void
zstream_finalize(struct zstream *z)
{
int err = z->func->end(&z->stream);
if (err == Z_STREAM_ERROR)
finalizer_warn("the stream state was inconsistent.");
if (err == Z_DATA_ERROR)
finalizer_warn("the stream was freed prematurely.");
}
static void
zstream_free(struct zstream *z)
{
if (ZSTREAM_IS_READY(z)) {
zstream_finalize(z);
}
xfree(z);
}
static VALUE
zstream_new(VALUE klass, const struct zstream_funcs *funcs)
{
VALUE obj;
struct zstream *z;
obj = Data_Make_Struct(klass, struct zstream,
zstream_mark, zstream_free, z);
zstream_init(z, funcs);
return obj;
}
#define zstream_deflate_new(klass) zstream_new((klass), &deflate_funcs)
#define zstream_inflate_new(klass) zstream_new((klass), &inflate_funcs)
static struct zstream *
get_zstream(VALUE obj)
{
struct zstream *z;
Data_Get_Struct(obj, struct zstream, z);
if (!ZSTREAM_IS_READY(z)) {
rb_raise(cZError, "stream is not ready");
}
return z;
}
/* ------------------------------------------------------------------------- */
/*
* Document-class: Zlib::ZStream
*
* Zlib::ZStream is the abstract class for the stream which handles the
* compressed data. The operations are defined in the subclasses:
* Zlib::Deflate for compression, and Zlib::Inflate for decompression.
*
* An instance of Zlib::ZStream has one stream (struct zstream in the source)
* and two variable-length buffers which associated to the input (next_in) of
* the stream and the output (next_out) of the stream. In this document,
* "input buffer" means the buffer for input, and "output buffer" means the
* buffer for output.
*
* Data input into an instance of Zlib::ZStream are temporally stored into
* the end of input buffer, and then data in input buffer are processed from
* the beginning of the buffer until no more output from the stream is
* produced (i.e. until avail_out > 0 after processing). During processing,
* output buffer is allocated and expanded automatically to hold all output
* data.
*
* Some particular instance methods consume the data in output buffer and
* return them as a String.
*
* Here is an ascii art for describing above:
*
* +================ an instance of Zlib::ZStream ================+
* || ||
* || +--------+ +-------+ +--------+ ||
* || +--| output |<---------|zstream|<---------| input |<--+ ||
* || | | buffer | next_out+-------+next_in | buffer | | ||
* || | +--------+ +--------+ | ||
* || | | ||
* +===|======================================================|===+
* | |
* v |
* "output data" "input data"
*
* If an error occurs during processing input buffer, an exception which is a
* subclass of Zlib::Error is raised. At that time, both input and output
* buffer keep their conditions at the time when the error occurs.
*
* == Method Catalogue
*
* Many of the methods in this class are fairly low-level and unlikely to be
* of interest to users. In fact, users are unlikely to use this class
* directly; rather they will be interested in Zlib::Inflate and
* Zlib::Deflate.
*
* The higher level methods are listed below.
*
* - #total_in
* - #total_out
* - #data_type
* - #adler
* - #reset
* - #finish
* - #finished?
* - #close
* - #closed?
*/
/*
* Closes the stream. All operations on the closed stream will raise an
* exception.
*/
static VALUE
rb_zstream_end(VALUE obj)
{
zstream_end(get_zstream(obj));
return Qnil;
}
/*
* Resets and initializes the stream. All data in both input and output buffer
* are discarded.
*/
static VALUE
rb_zstream_reset(VALUE obj)
{
zstream_reset(get_zstream(obj));
return Qnil;
}
/*
* Finishes the stream and flushes output buffer. See Zlib::Deflate#finish and
* Zlib::Inflate#finish for details of this behavior.
*/
static VALUE
rb_zstream_finish(VALUE obj)
{
struct zstream *z = get_zstream(obj);
VALUE dst;
zstream_run(z, (Bytef*)"", 0, Z_FINISH);
dst = zstream_detach_buffer(z);
OBJ_INFECT(dst, obj);
return dst;
}
/*
* Flushes input buffer and returns all data in that buffer.
*/
static VALUE
rb_zstream_flush_next_in(VALUE obj)
{
struct zstream *z;
VALUE dst;
Data_Get_Struct(obj, struct zstream, z);
dst = zstream_detach_input(z);
OBJ_INFECT(dst, obj);
return dst;
}
/*
* Flushes output buffer and returns all data in that buffer.
*/
static VALUE
rb_zstream_flush_next_out(VALUE obj)
{
struct zstream *z;
VALUE dst;
Data_Get_Struct(obj, struct zstream, z);
dst = zstream_detach_buffer(z);
OBJ_INFECT(dst, obj);
return dst;
}
/*
* Returns number of bytes of free spaces in output buffer. Because the free
* space is allocated automatically, this method returns 0 normally.
*/
static VALUE
rb_zstream_avail_out(VALUE obj)
{
struct zstream *z;
Data_Get_Struct(obj, struct zstream, z);
return rb_uint2inum(z->stream.avail_out);
}
/*
* Allocates +size+ bytes of free space in the output buffer. If there are more
* than +size+ bytes already in the buffer, the buffer is truncated. Because
* free space is allocated automatically, you usually don't need to use this
* method.
*/
static VALUE
rb_zstream_set_avail_out(VALUE obj, VALUE size)
{
struct zstream *z = get_zstream(obj);
Check_Type(size, T_FIXNUM);
zstream_expand_buffer_into(z, FIX2INT(size));
return size;
}
/*
* Returns bytes of data in the input buffer. Normally, returns 0.
*/
static VALUE
rb_zstream_avail_in(VALUE obj)
{
struct zstream *z;
Data_Get_Struct(obj, struct zstream, z);
return INT2FIX(NIL_P(z->input) ? 0 : (int)(RSTRING_LEN(z->input)));
}
/*
* Returns the total bytes of the input data to the stream. FIXME
*/
static VALUE
rb_zstream_total_in(VALUE obj)
{
return rb_uint2inum(get_zstream(obj)->stream.total_in);
}
/*
* Returns the total bytes of the output data from the stream. FIXME
*/
static VALUE
rb_zstream_total_out(VALUE obj)
{
return rb_uint2inum(get_zstream(obj)->stream.total_out);
}
/*
* Guesses the type of the data which have been inputed into the stream. The
* returned value is either <tt>Zlib::BINARY</tt>, <tt>Zlib::ASCII</tt>, or
* <tt>Zlib::UNKNOWN</tt>.
*/
static VALUE
rb_zstream_data_type(VALUE obj)
{
return INT2FIX(get_zstream(obj)->stream.data_type);
}
/*
* Returns the adler-32 checksum.
*/
static VALUE
rb_zstream_adler(VALUE obj)
{
return rb_uint2inum(get_zstream(obj)->stream.adler);
}
/*
* Returns true if the stream is finished.
*/
static VALUE
rb_zstream_finished_p(VALUE obj)
{
return ZSTREAM_IS_FINISHED(get_zstream(obj)) ? Qtrue : Qfalse;
}
/*
* Returns true if the stream is closed.
*/
static VALUE
rb_zstream_closed_p(VALUE obj)
{
struct zstream *z;
Data_Get_Struct(obj, struct zstream, z);
return ZSTREAM_IS_READY(z) ? Qfalse : Qtrue;
}
/* ------------------------------------------------------------------------- */
/*
* Document-class: Zlib::Deflate
*
* Zlib::Deflate is the class for compressing data. See Zlib::Stream for more
* information.
*/
#define FIXNUMARG(val, ifnil) \
(NIL_P((val)) ? (ifnil) \
: ((void)Check_Type((val), T_FIXNUM), FIX2INT((val))))
#define ARG_LEVEL(val) FIXNUMARG((val), Z_DEFAULT_COMPRESSION)
#define ARG_WBITS(val) FIXNUMARG((val), MAX_WBITS)
#define ARG_MEMLEVEL(val) FIXNUMARG((val), DEF_MEM_LEVEL)
#define ARG_STRATEGY(val) FIXNUMARG((val), Z_DEFAULT_STRATEGY)
#define ARG_FLUSH(val) FIXNUMARG((val), Z_NO_FLUSH)
static VALUE
rb_deflate_s_allocate(VALUE klass)
{
return zstream_deflate_new(klass);
}
/*
* call-seq: Zlib::Deflate.new(level=nil, windowBits=nil, memlevel=nil, strategy=nil)
*
* Creates a new deflate stream for compression. See zlib.h for details of
* each argument. If an argument is nil, the default value of that argument is
* used.
*
* TODO: document better!
*/
static VALUE
rb_deflate_initialize(int argc, VALUE *argv, VALUE obj)
{
struct zstream *z;
VALUE level, wbits, memlevel, strategy;
int err;
rb_scan_args(argc, argv, "04", &level, &wbits, &memlevel, &strategy);
Data_Get_Struct(obj, struct zstream, z);
err = deflateInit2(&z->stream, ARG_LEVEL(level), Z_DEFLATED,
ARG_WBITS(wbits), ARG_MEMLEVEL(memlevel),
ARG_STRATEGY(strategy));
if (err != Z_OK) {
raise_zlib_error(err, z->stream.msg);
}
ZSTREAM_READY(z);
return obj;
}
/*
* Duplicates the deflate stream.
*/
static VALUE
rb_deflate_init_copy(VALUE self, VALUE orig)
{
struct zstream *z1, *z2;
int err;
Data_Get_Struct(self, struct zstream, z1);
z2 = get_zstream(orig);
err = deflateCopy(&z1->stream, &z2->stream);
if (err != Z_OK) {
raise_zlib_error(err, 0);
}
z1->input = NIL_P(z2->input) ? Qnil : rb_str_dup(z2->input);
z1->buf = NIL_P(z2->buf) ? Qnil : rb_str_dup(z2->buf);
z1->buf_filled = z2->buf_filled;
z1->flags = z2->flags;
return self;
}
static VALUE
deflate_run(VALUE args)
{
struct zstream *z = (struct zstream*)((VALUE*)args)[0];
VALUE src = ((VALUE*)args)[1];
zstream_run(z, (Bytef*)RSTRING_PTR(src), RSTRING_LEN(src), Z_FINISH);
return zstream_detach_buffer(z);
}
/*
* call-seq: Zlib.deflate(string[, level])
* Zlib::Deflate.deflate(string[, level])
*
* Compresses the given +string+. Valid values of level are
* <tt>Zlib::NO_COMPRESSION</tt>, <tt>Zlib::BEST_SPEED</tt>,
* <tt>Zlib::BEST_COMPRESSION</tt>, <tt>Zlib::DEFAULT_COMPRESSION</tt>, and an
* integer from 0 to 9 (the default is 6).
*
* This method is almost equivalent to the following code:
*
* def deflate(string, level)
* z = Zlib::Deflate.new(level)
* dst = z.deflate(string, Zlib::FINISH)
* z.close
* dst
* end
*
* See also Zlib.inflate
*
*/
static VALUE
rb_deflate_s_deflate(int argc, VALUE *argv, VALUE klass)
{
struct zstream z;
VALUE src, level, dst, args[2];
int err, lev;
rb_scan_args(argc, argv, "11", &src, &level);
lev = ARG_LEVEL(level);
StringValue(src);
zstream_init_deflate(&z);
err = deflateInit(&z.stream, lev);
if (err != Z_OK) {
raise_zlib_error(err, z.stream.msg);
}
ZSTREAM_READY(&z);
args[0] = (VALUE)&z;
args[1] = src;
dst = rb_ensure(deflate_run, (VALUE)args, zstream_end, (VALUE)&z);
OBJ_INFECT(dst, src);
return dst;
}
static void
do_deflate(struct zstream *z, VALUE src, int flush)
{
if (NIL_P(src)) {
zstream_run(z, (Bytef*)"", 0, Z_FINISH);
return;
}
StringValue(src);
if (flush != Z_NO_FLUSH || RSTRING_LEN(src) > 0) { /* prevent BUF_ERROR */
zstream_run(z, (Bytef*)RSTRING_PTR(src), RSTRING_LEN(src), flush);
}
}
/*
* call-seq: deflate(string[, flush])
*
* Inputs +string+ into the deflate stream and returns the output from the
* stream. On calling this method, both the input and the output buffers of
* the stream are flushed. If +string+ is nil, this method finishes the
* stream, just like Zlib::ZStream#finish.
*
* The value of +flush+ should be either <tt>Zlib::NO_FLUSH</tt>,
* <tt>Zlib::SYNC_FLUSH</tt>, <tt>Zlib::FULL_FLUSH</tt>, or
* <tt>Zlib::FINISH</tt>. See zlib.h for details.
*
* TODO: document better!
*/
static VALUE
rb_deflate_deflate(int argc, VALUE *argv, VALUE obj)
{
struct zstream *z = get_zstream(obj);
VALUE src, flush, dst;
rb_scan_args(argc, argv, "11", &src, &flush);
OBJ_INFECT(obj, src);
do_deflate(z, src, ARG_FLUSH(flush));
dst = zstream_detach_buffer(z);
OBJ_INFECT(dst, obj);
return dst;
}
/*
* call-seq: << string
*
* Inputs +string+ into the deflate stream just like Zlib::Deflate#deflate, but
* returns the Zlib::Deflate object itself. The output from the stream is
* preserved in output buffer.
*/
static VALUE
rb_deflate_addstr(VALUE obj, VALUE src)
{
OBJ_INFECT(obj, src);
do_deflate(get_zstream(obj), src, Z_NO_FLUSH);
return obj;
}
/*
* call-seq: flush(flush)
*
* This method is equivalent to <tt>deflate('', flush)</tt>. If flush is omitted,
* <tt>Zlib::SYNC_FLUSH</tt> is used as flush. This method is just provided
* to improve the readability of your Ruby program.
*
* TODO: document better!
*/
static VALUE
rb_deflate_flush(int argc, VALUE *argv, VALUE obj)
{
struct zstream *z = get_zstream(obj);
VALUE v_flush, dst;
int flush;
rb_scan_args(argc, argv, "01", &v_flush);
flush = FIXNUMARG(v_flush, Z_SYNC_FLUSH);
if (flush != Z_NO_FLUSH) { /* prevent Z_BUF_ERROR */
zstream_run(z, (Bytef*)"", 0, flush);
}
dst = zstream_detach_buffer(z);
OBJ_INFECT(dst, obj);
return dst;
}
/*
* call-seq: params(level, strategy)
*
* Changes the parameters of the deflate stream. See zlib.h for details. The
* output from the stream by changing the params is preserved in output
* buffer.
*
* TODO: document better!
*/
static VALUE
rb_deflate_params(VALUE obj, VALUE v_level, VALUE v_strategy)
{
struct zstream *z = get_zstream(obj);
int level, strategy;
int err;
uInt n;
level = ARG_LEVEL(v_level);
strategy = ARG_STRATEGY(v_strategy);
n = z->stream.avail_out;
err = deflateParams(&z->stream, level, strategy);
z->buf_filled += n - z->stream.avail_out;
while (err == Z_BUF_ERROR) {
rb_warning("deflateParams() returned Z_BUF_ERROR");
zstream_expand_buffer(z);
n = z->stream.avail_out;
err = deflateParams(&z->stream, level, strategy);
z->buf_filled += n - z->stream.avail_out;
}
if (err != Z_OK) {
raise_zlib_error(err, z->stream.msg);
}
return Qnil;
}
/*
* call-seq: set_dictionary(string)
*
* Sets the preset dictionary and returns +string+. This method is available
* just only after Zlib::Deflate.new or Zlib::ZStream#reset method was called.
* See zlib.h for details.
*
* TODO: document better!
*/
static VALUE
rb_deflate_set_dictionary(VALUE obj, VALUE dic)
{
struct zstream *z = get_zstream(obj);
VALUE src = dic;
int err;
OBJ_INFECT(obj, dic);
StringValue(src);
err = deflateSetDictionary(&z->stream,
(Bytef*)RSTRING_PTR(src), RSTRING_LENINT(src));
if (err != Z_OK) {
raise_zlib_error(err, z->stream.msg);
}
return dic;
}
/* ------------------------------------------------------------------------- */
/*
* Document-class: Zlib::Inflate
*
* Zlib:Inflate is the class for decompressing compressed data. Unlike
* Zlib::Deflate, an instance of this class is not able to duplicate (clone,
* dup) itself.
*/
static VALUE
rb_inflate_s_allocate(VALUE klass)
{
return zstream_inflate_new(klass);
}
/*
* call-seq: Zlib::Inflate.new(window_bits)
*
* Creates a new inflate stream for decompression. See zlib.h for details
* of the argument. If +window_bits+ is +nil+, the default value is used.
*
* TODO: document better!
*/
static VALUE
rb_inflate_initialize(int argc, VALUE *argv, VALUE obj)
{
struct zstream *z;
VALUE wbits;
int err;
rb_scan_args(argc, argv, "01", &wbits);
Data_Get_Struct(obj, struct zstream, z);
err = inflateInit2(&z->stream, ARG_WBITS(wbits));
if (err != Z_OK) {
raise_zlib_error(err, z->stream.msg);
}
ZSTREAM_READY(z);
return obj;
}
static VALUE
inflate_run(VALUE args)
{
struct zstream *z = (struct zstream*)((VALUE*)args)[0];
VALUE src = ((VALUE*)args)[1];
zstream_run(z, (Bytef*)RSTRING_PTR(src), RSTRING_LEN(src), Z_SYNC_FLUSH);
zstream_run(z, (Bytef*)"", 0, Z_FINISH); /* for checking errors */
return zstream_detach_buffer(z);
}
/*
* call-seq: Zlib.inflate(string)
* Zlib::Inflate.inflate(string)
*
* Decompresses +string+. Raises a Zlib::NeedDict exception if a preset
* dictionary is needed for decompression.
*
* This method is almost equivalent to the following code:
*
* def inflate(string)
* zstream = Zlib::Inflate.new
* buf = zstream.inflate(string)
* zstream.finish
* zstream.close
* buf
* end
*
* See also Zlib.deflate
*
*/
static VALUE
rb_inflate_s_inflate(VALUE obj, VALUE src)
{
struct zstream z;
VALUE dst, args[2];
int err;
StringValue(src);
zstream_init_inflate(&z);
err = inflateInit(&z.stream);
if (err != Z_OK) {
raise_zlib_error(err, z.stream.msg);
}
ZSTREAM_READY(&z);
args[0] = (VALUE)&z;
args[1] = src;
dst = rb_ensure(inflate_run, (VALUE)args, zstream_end, (VALUE)&z);
OBJ_INFECT(dst, src);
return dst;
}
static void
do_inflate(struct zstream *z, VALUE src)
{
if (NIL_P(src)) {
zstream_run(z, (Bytef*)"", 0, Z_FINISH);
return;
}
StringValue(src);
if (RSTRING_LEN(src) > 0) { /* prevent Z_BUF_ERROR */
zstream_run(z, (Bytef*)RSTRING_PTR(src), RSTRING_LEN(src), Z_SYNC_FLUSH);
}
}
/*
* call-seq: inflate(string)
*
* Inputs +string+ into the inflate stream and returns the output from the
* stream. Calling this method, both the input and the output buffer of the
* stream are flushed. If string is +nil+, this method finishes the stream,
* just like Zlib::ZStream#finish.
*
* Raises a Zlib::NeedDict exception if a preset dictionary is needed to
* decompress. Set the dictionary by Zlib::Inflate#set_dictionary and then
* call this method again with an empty string. (<i>???</i>)
*
* TODO: document better!
*/
static VALUE
rb_inflate_inflate(VALUE obj, VALUE src)
{
struct zstream *z = get_zstream(obj);
VALUE dst;
OBJ_INFECT(obj, src);
if (ZSTREAM_IS_FINISHED(z)) {
if (NIL_P(src)) {
dst = zstream_detach_buffer(z);
}
else {
StringValue(src);
zstream_append_buffer2(z, src);
dst = rb_str_new(0, 0);
}
}
else {
do_inflate(z, src);
dst = zstream_detach_buffer(z);
if (ZSTREAM_IS_FINISHED(z)) {
zstream_passthrough_input(z);
}
}
OBJ_INFECT(dst, obj);
return dst;
}
/*
* call-seq: << string
*
* Inputs +string+ into the inflate stream just like Zlib::Inflate#inflate, but
* returns the Zlib::Inflate object itself. The output from the stream is
* preserved in output buffer.
*/
static VALUE
rb_inflate_addstr(VALUE obj, VALUE src)
{
struct zstream *z = get_zstream(obj);
OBJ_INFECT(obj, src);
if (ZSTREAM_IS_FINISHED(z)) {
if (!NIL_P(src)) {
StringValue(src);
zstream_append_buffer2(z, src);
}
}
else {
do_inflate(z, src);
if (ZSTREAM_IS_FINISHED(z)) {
zstream_passthrough_input(z);
}
}
return obj;
}
/*
* call-seq: sync(string)
*
* Inputs +string+ into the end of input buffer and skips data until a full
* flush point can be found. If the point is found in the buffer, this method
* flushes the buffer and returns false. Otherwise it returns +true+ and the
* following data of full flush point is preserved in the buffer.
*/
static VALUE
rb_inflate_sync(VALUE obj, VALUE src)
{
struct zstream *z = get_zstream(obj);
OBJ_INFECT(obj, src);
StringValue(src);
return zstream_sync(z, (Bytef*)RSTRING_PTR(src), RSTRING_LEN(src));
}
/*
* Quoted verbatim from original documentation:
*
* What is this?
*
* <tt>:)</tt>
*/
static VALUE
rb_inflate_sync_point_p(VALUE obj)
{
struct zstream *z = get_zstream(obj);
int err;
err = inflateSyncPoint(&z->stream);
if (err == 1) {
return Qtrue;
}
if (err != Z_OK) {
raise_zlib_error(err, z->stream.msg);
}
return Qfalse;
}
/*
* Sets the preset dictionary and returns +string+. This method is available just
* only after a Zlib::NeedDict exception was raised. See zlib.h for details.
*
* TODO: document better!
*/
static VALUE
rb_inflate_set_dictionary(VALUE obj, VALUE dic)
{
struct zstream *z = get_zstream(obj);
VALUE src = dic;
int err;
OBJ_INFECT(obj, dic);
StringValue(src);
err = inflateSetDictionary(&z->stream,
(Bytef*)RSTRING_PTR(src), RSTRING_LENINT(src));
if (err != Z_OK) {
raise_zlib_error(err, z->stream.msg);
}
return dic;
}
#if GZIP_SUPPORT
/* NOTE: Features for gzip files of Ruby/zlib are written from scratch
* and using undocumented feature of zlib, negative wbits.
* I don't think gzFile APIs of zlib are good for Ruby.
*/
/*------- .gz file header --------*/
#define GZ_MAGIC1 0x1f
#define GZ_MAGIC2 0x8b
#define GZ_METHOD_DEFLATE 8
#define GZ_FLAG_MULTIPART 0x2
#define GZ_FLAG_EXTRA 0x4
#define GZ_FLAG_ORIG_NAME 0x8
#define GZ_FLAG_COMMENT 0x10
#define GZ_FLAG_ENCRYPT 0x20
#define GZ_FLAG_UNKNOWN_MASK 0xc0
#define GZ_EXTRAFLAG_FAST 0x4
#define GZ_EXTRAFLAG_SLOW 0x2
/* from zutil.h */
#define OS_MSDOS 0x00
#define OS_AMIGA 0x01
#define OS_VMS 0x02
#define OS_UNIX 0x03
#define OS_ATARI 0x05
#define OS_OS2 0x06
#define OS_MACOS 0x07
#define OS_TOPS20 0x0a
#define OS_WIN32 0x0b
#define OS_VMCMS 0x04
#define OS_ZSYSTEM 0x08
#define OS_CPM 0x09
#define OS_QDOS 0x0c
#define OS_RISCOS 0x0d
#define OS_UNKNOWN 0xff
#ifndef OS_CODE
#define OS_CODE OS_UNIX
#endif
static ID id_write, id_read, id_readpartial, id_flush, id_seek, id_close, id_path, id_input;
static VALUE cGzError, cNoFooter, cCRCError, cLengthError;
/*-------- gzfile internal APIs --------*/
struct gzfile {
struct zstream z;
VALUE io;
int level;
time_t mtime; /* for header */
int os_code; /* for header */
VALUE orig_name; /* for header; must be a String */
VALUE comment; /* for header; must be a String */
unsigned long crc;
int lineno;
long ungetc;
void (*end)(struct gzfile *);
rb_encoding *enc;
rb_encoding *enc2;
rb_econv_t *ec;
int ecflags;
VALUE ecopts;
char *cbuf;
VALUE path;
};
#define GZFILE_CBUF_CAPA 10
#define GZFILE_FLAG_SYNC ZSTREAM_FLAG_UNUSED
#define GZFILE_FLAG_HEADER_FINISHED (ZSTREAM_FLAG_UNUSED << 1)
#define GZFILE_FLAG_FOOTER_FINISHED (ZSTREAM_FLAG_UNUSED << 2)
#define GZFILE_IS_FINISHED(gz) \
(ZSTREAM_IS_FINISHED(&gz->z) && (gz)->z.buf_filled == 0)
#define GZFILE_READ_SIZE 2048
static void
gzfile_mark(struct gzfile *gz)
{
rb_gc_mark(gz->io);
rb_gc_mark(gz->orig_name);
rb_gc_mark(gz->comment);
zstream_mark(&gz->z);
rb_gc_mark(gz->ecopts);
rb_gc_mark(gz->path);
}
static void
gzfile_free(struct gzfile *gz)
{
struct zstream *z = &gz->z;
if (ZSTREAM_IS_READY(z)) {
if (z->func == &deflate_funcs) {
finalizer_warn("Zlib::GzipWriter object must be closed explicitly.");
}
zstream_finalize(z);
}
if (gz->cbuf) {
xfree(gz->cbuf);
}
xfree(gz);
}
static VALUE
gzfile_new(klass, funcs, endfunc)
VALUE klass;
const struct zstream_funcs *funcs;
void (*endfunc)(struct gzfile *);
{
VALUE obj;
struct gzfile *gz;
obj = Data_Make_Struct(klass, struct gzfile, gzfile_mark, gzfile_free, gz);
zstream_init(&gz->z, funcs);
gz->io = Qnil;
gz->level = 0;
gz->mtime = 0;
gz->os_code = OS_CODE;
gz->orig_name = Qnil;
gz->comment = Qnil;
gz->crc = crc32(0, Z_NULL, 0);
gz->lineno = 0;
gz->ungetc = 0;
gz->end = endfunc;
gz->enc = rb_default_external_encoding();
gz->enc2 = 0;
gz->ec = NULL;
gz->ecflags = 0;
gz->ecopts = Qnil;
gz->cbuf = 0;
gz->path = Qnil;
return obj;
}
#define gzfile_writer_new(gz) gzfile_new((gz),&deflate_funcs,gzfile_writer_end)
#define gzfile_reader_new(gz) gzfile_new((gz),&inflate_funcs,gzfile_reader_end)
static void
gzfile_reset(struct gzfile *gz)
{
zstream_reset(&gz->z);
gz->crc = crc32(0, Z_NULL, 0);
gz->lineno = 0;
gz->ungetc = 0;
if (gz->ec) {
rb_econv_close(gz->ec);
gz->ec = rb_econv_open_opts(gz->enc2->name, gz->enc->name,
gz->ecflags, gz->ecopts);
}
}
static void
gzfile_close(struct gzfile *gz, int closeflag)
{
VALUE io = gz->io;
gz->end(gz);
gz->io = Qnil;
gz->orig_name = Qnil;
gz->comment = Qnil;
if (closeflag && rb_respond_to(io, id_close)) {
rb_funcall(io, id_close, 0);
}
}
static void
gzfile_write_raw(struct gzfile *gz)
{
VALUE str;
if (gz->z.buf_filled > 0) {
str = zstream_detach_buffer(&gz->z);
OBJ_TAINT(str); /* for safe */
rb_funcall(gz->io, id_write, 1, str);
if ((gz->z.flags & GZFILE_FLAG_SYNC)
&& rb_respond_to(gz->io, id_flush))
rb_funcall(gz->io, id_flush, 0);
}
}
static VALUE
gzfile_read_raw_partial(VALUE arg)
{
struct gzfile *gz = (struct gzfile*)arg;
VALUE str;
str = rb_funcall(gz->io, id_readpartial, 1, INT2FIX(GZFILE_READ_SIZE));
Check_Type(str, T_STRING);
return str;
}
static VALUE
gzfile_read_raw_rescue(VALUE arg)
{
struct gzfile *gz = (struct gzfile*)arg;
VALUE str = Qnil;
if (rb_obj_is_kind_of(rb_errinfo(), rb_eNoMethodError)) {
str = rb_funcall(gz->io, id_read, 1, INT2FIX(GZFILE_READ_SIZE));
if (!NIL_P(str)) {
Check_Type(str, T_STRING);
}
}
return str; /* return nil when EOFError */
}
static VALUE
gzfile_read_raw(struct gzfile *gz)
{
return rb_rescue2(gzfile_read_raw_partial, (VALUE)gz,
gzfile_read_raw_rescue, (VALUE)gz,
rb_eEOFError, rb_eNoMethodError, (VALUE)0);
}
static int
gzfile_read_raw_ensure(struct gzfile *gz, long size)
{
VALUE str;
while (NIL_P(gz->z.input) || RSTRING_LEN(gz->z.input) < size) {
str = gzfile_read_raw(gz);
if (NIL_P(str)) return 0;
zstream_append_input2(&gz->z, str);
}
return 1;
}
static char *
gzfile_read_raw_until_zero(struct gzfile *gz, long offset)
{
VALUE str;
char *p;
for (;;) {
p = memchr(RSTRING_PTR(gz->z.input) + offset, '\0',
RSTRING_LEN(gz->z.input) - offset);
if (p) break;
str = gzfile_read_raw(gz);
if (NIL_P(str)) {
rb_raise(cGzError, "unexpected end of file");
}
offset = RSTRING_LEN(gz->z.input);
zstream_append_input2(&gz->z, str);
}
return p;
}
static unsigned int
gzfile_get16(const unsigned char *src)
{
unsigned int n;
n = *(src++) & 0xff;
n |= (*(src++) & 0xff) << 8;
return n;
}
static unsigned long
gzfile_get32(const unsigned char *src)
{
unsigned long n;
n = *(src++) & 0xff;
n |= (*(src++) & 0xff) << 8;
n |= (*(src++) & 0xff) << 16;
n |= (*(src++) & 0xffU) << 24;
return n;
}
static void
gzfile_set32(unsigned long n, unsigned char *dst)
{
*(dst++) = n & 0xff;
*(dst++) = (n >> 8) & 0xff;
*(dst++) = (n >> 16) & 0xff;
*dst = (n >> 24) & 0xff;
}
static void
gzfile_raise(struct gzfile *gz, VALUE klass, const char *message)
{
VALUE exc = rb_exc_new2(klass, message);
if (!NIL_P(gz->z.input)) {
VALUE rb_str_resurrect(VALUE);
rb_ivar_set(exc, id_input, rb_str_resurrect(gz->z.input));
}
rb_exc_raise(exc);
}
static VALUE
gzfile_error_inspect(VALUE error)
{
VALUE str = rb_call_super(0, 0);
VALUE input = rb_attr_get(error, id_input);
if (!NIL_P(input)) {
rb_str_resize(str, RSTRING_LEN(str)-1);
rb_str_cat2(str, ", input=");
rb_str_append(str, rb_str_inspect(input));
rb_str_cat2(str, ">");
}
return str;
}
static void
gzfile_make_header(struct gzfile *gz)
{
Bytef buf[10]; /* the size of gzip header */
unsigned char flags = 0, extraflags = 0;
if (!NIL_P(gz->orig_name)) {
flags |= GZ_FLAG_ORIG_NAME;
}
if (!NIL_P(gz->comment)) {
flags |= GZ_FLAG_COMMENT;
}
if (gz->mtime == 0) {
gz->mtime = time(0);
}
if (gz->level == Z_BEST_SPEED) {
extraflags |= GZ_EXTRAFLAG_FAST;
}
else if (gz->level == Z_BEST_COMPRESSION) {
extraflags |= GZ_EXTRAFLAG_SLOW;
}
buf[0] = GZ_MAGIC1;
buf[1] = GZ_MAGIC2;
buf[2] = GZ_METHOD_DEFLATE;
buf[3] = flags;
gzfile_set32((unsigned long)gz->mtime, &buf[4]);
buf[8] = extraflags;
buf[9] = gz->os_code;
zstream_append_buffer(&gz->z, buf, sizeof(buf));
if (!NIL_P(gz->orig_name)) {
zstream_append_buffer2(&gz->z, gz->orig_name);
zstream_append_buffer(&gz->z, (Bytef*)"\0", 1);
}
if (!NIL_P(gz->comment)) {
zstream_append_buffer2(&gz->z, gz->comment);
zstream_append_buffer(&gz->z, (Bytef*)"\0", 1);
}
gz->z.flags |= GZFILE_FLAG_HEADER_FINISHED;
}
static void
gzfile_make_footer(struct gzfile *gz)
{
Bytef buf[8]; /* 8 is the size of gzip footer */
gzfile_set32(gz->crc, buf);
gzfile_set32(gz->z.stream.total_in, &buf[4]);
zstream_append_buffer(&gz->z, buf, sizeof(buf));
gz->z.flags |= GZFILE_FLAG_FOOTER_FINISHED;
}
static void
gzfile_read_header(struct gzfile *gz)
{
const unsigned char *head;
long len;
char flags, *p;
if (!gzfile_read_raw_ensure(gz, 10)) { /* 10 is the size of gzip header */
gzfile_raise(gz, cGzError, "not in gzip format");
}
head = (unsigned char*)RSTRING_PTR(gz->z.input);
if (head[0] != GZ_MAGIC1 || head[1] != GZ_MAGIC2) {
gzfile_raise(gz, cGzError, "not in gzip format");
}
if (head[2] != GZ_METHOD_DEFLATE) {
rb_raise(cGzError, "unsupported compression method %d", head[2]);
}
flags = head[3];
if (flags & GZ_FLAG_MULTIPART) {
rb_raise(cGzError, "multi-part gzip file is not supported");
}
else if (flags & GZ_FLAG_ENCRYPT) {
rb_raise(cGzError, "encrypted gzip file is not supported");
}
else if (flags & GZ_FLAG_UNKNOWN_MASK) {
rb_raise(cGzError, "unknown flags 0x%02x", flags);
}
if (head[8] & GZ_EXTRAFLAG_FAST) {
gz->level = Z_BEST_SPEED;
}
else if (head[8] & GZ_EXTRAFLAG_SLOW) {
gz->level = Z_BEST_COMPRESSION;
}
else {
gz->level = Z_DEFAULT_COMPRESSION;
}
gz->mtime = gzfile_get32(&head[4]);
gz->os_code = head[9];
zstream_discard_input(&gz->z, 10);
if (flags & GZ_FLAG_EXTRA) {
if (!gzfile_read_raw_ensure(gz, 2)) {
rb_raise(cGzError, "unexpected end of file");
}
len = gzfile_get16((Bytef*)RSTRING_PTR(gz->z.input));
if (!gzfile_read_raw_ensure(gz, 2 + len)) {
rb_raise(cGzError, "unexpected end of file");
}
zstream_discard_input(&gz->z, 2 + len);
}
if (flags & GZ_FLAG_ORIG_NAME) {
p = gzfile_read_raw_until_zero(gz, 0);
len = p - RSTRING_PTR(gz->z.input);
gz->orig_name = rb_str_new(RSTRING_PTR(gz->z.input), len);
OBJ_TAINT(gz->orig_name); /* for safe */
zstream_discard_input(&gz->z, len + 1);
}
if (flags & GZ_FLAG_COMMENT) {
p = gzfile_read_raw_until_zero(gz, 0);
len = p - RSTRING_PTR(gz->z.input);
gz->comment = rb_str_new(RSTRING_PTR(gz->z.input), len);
OBJ_TAINT(gz->comment); /* for safe */
zstream_discard_input(&gz->z, len + 1);
}
if (gz->z.input != Qnil && RSTRING_LEN(gz->z.input) > 0) {
zstream_run(&gz->z, 0, 0, Z_SYNC_FLUSH);
}
}
static void
gzfile_check_footer(struct gzfile *gz)
{
unsigned long crc, length;
gz->z.flags |= GZFILE_FLAG_FOOTER_FINISHED;
if (!gzfile_read_raw_ensure(gz, 8)) { /* 8 is the size of gzip footer */
gzfile_raise(gz, cNoFooter, "footer is not found");
}
crc = gzfile_get32((Bytef*)RSTRING_PTR(gz->z.input));
length = gzfile_get32((Bytef*)RSTRING_PTR(gz->z.input) + 4);
gz->z.stream.total_in += 8; /* to rewind correctly */
zstream_discard_input(&gz->z, 8);
if (gz->crc != crc) {
rb_raise(cCRCError, "invalid compressed data -- crc error");
}
if (gz->z.stream.total_out != length) {
rb_raise(cLengthError, "invalid compressed data -- length error");
}
}
static void
gzfile_write(struct gzfile *gz, Bytef *str, long len)
{
if (!(gz->z.flags & GZFILE_FLAG_HEADER_FINISHED)) {
gzfile_make_header(gz);
}
if (len > 0 || (gz->z.flags & GZFILE_FLAG_SYNC)) {
gz->crc = checksum_long(crc32, gz->crc, str, len);
zstream_run(&gz->z, str, len, (gz->z.flags & GZFILE_FLAG_SYNC)
? Z_SYNC_FLUSH : Z_NO_FLUSH);
}
gzfile_write_raw(gz);
}
static long
gzfile_read_more(struct gzfile *gz)
{
volatile VALUE str;
while (!ZSTREAM_IS_FINISHED(&gz->z)) {
str = gzfile_read_raw(gz);
if (NIL_P(str)) {
if (!ZSTREAM_IS_FINISHED(&gz->z)) {
rb_raise(cGzError, "unexpected end of file");
}
break;
}
if (RSTRING_LEN(str) > 0) { /* prevent Z_BUF_ERROR */
zstream_run(&gz->z, (Bytef*)RSTRING_PTR(str), RSTRING_LEN(str),
Z_SYNC_FLUSH);
}
if (gz->z.buf_filled > 0) break;
}
return gz->z.buf_filled;
}
static void
gzfile_calc_crc(struct gzfile *gz, VALUE str)
{
if (RSTRING_LEN(str) <= gz->ungetc) {
gz->ungetc -= RSTRING_LEN(str);
}
else {
gz->crc = checksum_long(crc32, gz->crc, (Bytef*)RSTRING_PTR(str) + gz->ungetc,
RSTRING_LEN(str) - gz->ungetc);
gz->ungetc = 0;
}
}
static VALUE
gzfile_newstr(struct gzfile *gz, VALUE str)
{
if (!gz->enc2) {
rb_enc_associate(str, gz->enc);
OBJ_TAINT(str); /* for safe */
return str;
}
if (gz->ec && rb_enc_dummy_p(gz->enc2)) {
str = rb_econv_str_convert(gz->ec, str, ECONV_PARTIAL_INPUT);
rb_enc_associate(str, gz->enc);
OBJ_TAINT(str);
return str;
}
return rb_str_conv_enc_opts(str, gz->enc2, gz->enc,
gz->ecflags, gz->ecopts);
}
static long
gzfile_fill(struct gzfile *gz, long len)
{
if (len < 0)
rb_raise(rb_eArgError, "negative length %ld given", len);
if (len == 0)
return 0;
while (!ZSTREAM_IS_FINISHED(&gz->z) && gz->z.buf_filled < len) {
gzfile_read_more(gz);
}
if (GZFILE_IS_FINISHED(gz)) {
if (!(gz->z.flags & GZFILE_FLAG_FOOTER_FINISHED)) {
gzfile_check_footer(gz);
}
return -1;
}
return len < gz->z.buf_filled ? len : gz->z.buf_filled;
}
static VALUE
gzfile_read(struct gzfile *gz, long len)
{
VALUE dst;
len = gzfile_fill(gz, len);
if (len == 0) return rb_str_new(0, 0);
if (len < 0) return Qnil;
dst = zstream_shift_buffer(&gz->z, len);
gzfile_calc_crc(gz, dst);
return dst;
}
static VALUE
gzfile_readpartial(struct gzfile *gz, long len, VALUE outbuf)
{
VALUE dst;
if (len < 0)
rb_raise(rb_eArgError, "negative length %ld given", len);
if (!NIL_P(outbuf))
OBJ_TAINT(outbuf);
if (len == 0) {
if (NIL_P(outbuf))
return rb_str_new(0, 0);
else {
rb_str_resize(outbuf, 0);
return outbuf;
}
}
while (!ZSTREAM_IS_FINISHED(&gz->z) && gz->z.buf_filled == 0) {
gzfile_read_more(gz);
}
if (GZFILE_IS_FINISHED(gz)) {
if (!(gz->z.flags & GZFILE_FLAG_FOOTER_FINISHED)) {
gzfile_check_footer(gz);
}
if (!NIL_P(outbuf))
rb_str_resize(outbuf, 0);
rb_raise(rb_eEOFError, "end of file reached");
}
dst = zstream_shift_buffer(&gz->z, len);
gzfile_calc_crc(gz, dst);
if (!NIL_P(outbuf)) {
rb_str_resize(outbuf, RSTRING_LEN(dst));
memcpy(RSTRING_PTR(outbuf), RSTRING_PTR(dst), RSTRING_LEN(dst));
dst = outbuf;
}
OBJ_TAINT(dst); /* for safe */
return dst;
}
static VALUE
gzfile_read_all(struct gzfile *gz)
{
VALUE dst;
while (!ZSTREAM_IS_FINISHED(&gz->z)) {
gzfile_read_more(gz);
}
if (GZFILE_IS_FINISHED(gz)) {
if (!(gz->z.flags & GZFILE_FLAG_FOOTER_FINISHED)) {
gzfile_check_footer(gz);
}
return rb_str_new(0, 0);
}
dst = zstream_detach_buffer(&gz->z);
gzfile_calc_crc(gz, dst);
OBJ_TAINT(dst);
return gzfile_newstr(gz, dst);
}
static VALUE
gzfile_getc(struct gzfile *gz)
{
VALUE buf, dst = 0;
int len;
len = rb_enc_mbmaxlen(gz->enc);
while (!ZSTREAM_IS_FINISHED(&gz->z) && gz->z.buf_filled < len) {
gzfile_read_more(gz);
}
if (GZFILE_IS_FINISHED(gz)) {
if (!(gz->z.flags & GZFILE_FLAG_FOOTER_FINISHED)) {
gzfile_check_footer(gz);
}
return Qnil;
}
if (gz->ec && rb_enc_dummy_p(gz->enc2)) {
const unsigned char *ss, *sp, *se;
unsigned char *ds, *dp, *de;
rb_econv_result_t res;
if (!gz->cbuf) {
gz->cbuf = ALLOC_N(char, GZFILE_CBUF_CAPA);
}
ss = sp = (const unsigned char*)RSTRING_PTR(gz->z.buf);
se = sp + gz->z.buf_filled;
ds = dp = (unsigned char *)gz->cbuf;
de = (unsigned char *)ds + GZFILE_CBUF_CAPA;
res = rb_econv_convert(gz->ec, &sp, se, &dp, de, ECONV_PARTIAL_INPUT|ECONV_AFTER_OUTPUT);
rb_econv_check_error(gz->ec);
dst = zstream_shift_buffer(&gz->z, sp - ss);
gzfile_calc_crc(gz, dst);
dst = rb_str_new(gz->cbuf, dp - ds);
rb_enc_associate(dst, gz->enc);
OBJ_TAINT(dst);
return dst;
}
else {
buf = gz->z.buf;
len = rb_enc_mbclen(RSTRING_PTR(buf), RSTRING_END(buf), gz->enc);
dst = gzfile_read(gz, len);
return gzfile_newstr(gz, dst);
}
}
static void
gzfile_ungets(struct gzfile *gz, const Bytef *b, long len)
{
zstream_buffer_ungets(&gz->z, b, len);
gz->ungetc+=len;
}
static void
gzfile_ungetbyte(struct gzfile *gz, int c)
{
zstream_buffer_ungetbyte(&gz->z, c);
gz->ungetc++;
}
static VALUE
gzfile_writer_end_run(VALUE arg)
{
struct gzfile *gz = (struct gzfile *)arg;
if (!(gz->z.flags & GZFILE_FLAG_HEADER_FINISHED)) {
gzfile_make_header(gz);
}
zstream_run(&gz->z, (Bytef*)"", 0, Z_FINISH);
gzfile_make_footer(gz);
gzfile_write_raw(gz);
return Qnil;
}
static void
gzfile_writer_end(struct gzfile *gz)
{
if (ZSTREAM_IS_CLOSING(&gz->z)) return;
gz->z.flags |= ZSTREAM_FLAG_CLOSING;
rb_ensure(gzfile_writer_end_run, (VALUE)gz, zstream_end, (VALUE)&gz->z);
}
static VALUE
gzfile_reader_end_run(VALUE arg)
{
struct gzfile *gz = (struct gzfile *)arg;
if (GZFILE_IS_FINISHED(gz)
&& !(gz->z.flags & GZFILE_FLAG_FOOTER_FINISHED)) {
gzfile_check_footer(gz);
}
return Qnil;
}
static void
gzfile_reader_end(struct gzfile *gz)
{
if (ZSTREAM_IS_CLOSING(&gz->z)) return;
gz->z.flags |= ZSTREAM_FLAG_CLOSING;
rb_ensure(gzfile_reader_end_run, (VALUE)gz, zstream_end, (VALUE)&gz->z);
}
static void
gzfile_reader_rewind(struct gzfile *gz)
{
long n;
n = gz->z.stream.total_in;
if (!NIL_P(gz->z.input)) {
n += RSTRING_LEN(gz->z.input);
}
rb_funcall(gz->io, id_seek, 2, rb_int2inum(-n), INT2FIX(1));
gzfile_reset(gz);
}
static VALUE
gzfile_reader_get_unused(struct gzfile *gz)
{
VALUE str;
if (!ZSTREAM_IS_READY(&gz->z)) return Qnil;
if (!GZFILE_IS_FINISHED(gz)) return Qnil;
if (!(gz->z.flags & GZFILE_FLAG_FOOTER_FINISHED)) {
gzfile_check_footer(gz);
}
if (NIL_P(gz->z.input)) return Qnil;
str = rb_str_dup(gz->z.input);
OBJ_TAINT(str); /* for safe */
return str;
}
static struct gzfile *
get_gzfile(VALUE obj)
{
struct gzfile *gz;
Data_Get_Struct(obj, struct gzfile, gz);
if (!ZSTREAM_IS_READY(&gz->z)) {
rb_raise(cGzError, "closed gzip stream");
}
return gz;
}
/* ------------------------------------------------------------------------- */
/*
* Document-class: Zlib::GzipFile
*
* Zlib::GzipFile is an abstract class for handling a gzip formatted
* compressed file. The operations are defined in the subclasses,
* Zlib::GzipReader for reading, and Zlib::GzipWriter for writing.
*
* GzipReader should be used by associating an IO, or IO-like, object.
*/
typedef struct {
int argc;
VALUE *argv;
VALUE klass;
} new_wrap_arg_t;
static VALUE
new_wrap(VALUE tmp)
{
new_wrap_arg_t *arg = (new_wrap_arg_t *)tmp;
return rb_class_new_instance(arg->argc, arg->argv, arg->klass);
}
static VALUE
gzfile_ensure_close(VALUE obj)
{
struct gzfile *gz;
Data_Get_Struct(obj, struct gzfile, gz);
if (ZSTREAM_IS_READY(&gz->z)) {
gzfile_close(gz, 1);
}
return Qnil;
}
static VALUE
gzfile_wrap(int argc, VALUE *argv, VALUE klass, int close_io_on_error)
{
VALUE obj;
if (close_io_on_error) {
int state = 0;
new_wrap_arg_t arg;
arg.argc = argc;
arg.argv = argv;
arg.klass = klass;
obj = rb_protect(new_wrap, (VALUE)&arg, &state);
if (state) {
rb_io_close(argv[0]);
rb_jump_tag(state);
}
}
else {
obj = rb_class_new_instance(argc, argv, klass);
}
if (rb_block_given_p()) {
return rb_ensure(rb_yield, obj, gzfile_ensure_close, obj);
}
else {
return obj;
}
}
/*
* call-seq: Zlib::GzipFile.wrap(io) { |gz| ... }
*
* Creates a GzipFile object associated with +io+, and
* executes the block with the newly created GzipFile object,
* just like File.open. The GzipFile object will be closed
* automatically after executing the block. If you want to keep
* the associated IO object opening, you may call
* +Zlib::GzipFile#finish+ method in the block.
*/
static VALUE
rb_gzfile_s_wrap(int argc, VALUE *argv, VALUE klass)
{
return gzfile_wrap(argc, argv, klass, 0);
}
/*
* See Zlib::GzipReader#open and Zlib::GzipWriter#open.
*/
static VALUE
gzfile_s_open(int argc, VALUE *argv, VALUE klass, const char *mode)
{
VALUE io, filename;
if (argc < 1) {
rb_raise(rb_eArgError, "wrong number of arguments (0 for 1)");
}
filename = argv[0];
io = rb_file_open_str(filename, mode);
argv[0] = io;
return gzfile_wrap(argc, argv, klass, 1);
}
/*
* Same as IO.
*/
static VALUE
rb_gzfile_to_io(VALUE obj)
{
return get_gzfile(obj)->io;
}
/*
* Returns CRC value of the uncompressed data.
*/
static VALUE
rb_gzfile_crc(VALUE obj)
{
return rb_uint2inum(get_gzfile(obj)->crc);
}
/*
* Returns last modification time recorded in the gzip file header.
*/
static VALUE
rb_gzfile_mtime(VALUE obj)
{
return rb_time_new(get_gzfile(obj)->mtime, (time_t)0);
}
/*
* Returns compression level.
*/
static VALUE
rb_gzfile_level(VALUE obj)
{
return INT2FIX(get_gzfile(obj)->level);
}
/*
* Returns OS code number recorded in the gzip file header.
*/
static VALUE
rb_gzfile_os_code(VALUE obj)
{
return INT2FIX(get_gzfile(obj)->os_code);
}
/*
* Returns original filename recorded in the gzip file header, or +nil+ if
* original filename is not present.
*/
static VALUE
rb_gzfile_orig_name(VALUE obj)
{
VALUE str = get_gzfile(obj)->orig_name;
if (!NIL_P(str)) {
str = rb_str_dup(str);
}
OBJ_TAINT(str); /* for safe */
return str;
}
/*
* Returns comments recorded in the gzip file header, or nil if the comments
* is not present.
*/
static VALUE
rb_gzfile_comment(VALUE obj)
{
VALUE str = get_gzfile(obj)->comment;
if (!NIL_P(str)) {
str = rb_str_dup(str);
}
OBJ_TAINT(str); /* for safe */
return str;
}
/*
* ???
*/
static VALUE
rb_gzfile_lineno(VALUE obj)
{
return INT2NUM(get_gzfile(obj)->lineno);
}
/*
* ???
*/
static VALUE
rb_gzfile_set_lineno(VALUE obj, VALUE lineno)
{
struct gzfile *gz = get_gzfile(obj);
gz->lineno = NUM2INT(lineno);
return lineno;
}
/*
* ???
*/
static VALUE
rb_gzfile_set_mtime(VALUE obj, VALUE mtime)
{
struct gzfile *gz = get_gzfile(obj);
VALUE val;
if (gz->z.flags & GZFILE_FLAG_HEADER_FINISHED) {
rb_raise(cGzError, "header is already written");
}
if (FIXNUM_P(mtime)) {
gz->mtime = FIX2INT(mtime);
}
else {
val = rb_Integer(mtime);
gz->mtime = FIXNUM_P(val) ? FIX2UINT(val) : rb_big2ulong(val);
}
return mtime;
}
/*
* ???
*/
static VALUE
rb_gzfile_set_orig_name(VALUE obj, VALUE str)
{
struct gzfile *gz = get_gzfile(obj);
VALUE s;
char *p;
if (gz->z.flags & GZFILE_FLAG_HEADER_FINISHED) {
rb_raise(cGzError, "header is already written");
}
s = rb_str_dup(rb_str_to_str(str));
p = memchr(RSTRING_PTR(s), '\0', RSTRING_LEN(s));
if (p) {
rb_str_resize(s, p - RSTRING_PTR(s));
}
gz->orig_name = s;
return str;
}
/*
* ???
*/
static VALUE
rb_gzfile_set_comment(VALUE obj, VALUE str)
{
struct gzfile *gz = get_gzfile(obj);
VALUE s;
char *p;
if (gz->z.flags & GZFILE_FLAG_HEADER_FINISHED) {
rb_raise(cGzError, "header is already written");
}
s = rb_str_dup(rb_str_to_str(str));
p = memchr(RSTRING_PTR(s), '\0', RSTRING_LEN(s));
if (p) {
rb_str_resize(s, p - RSTRING_PTR(s));
}
gz->comment = s;
return str;
}
/*
* Closes the GzipFile object. This method calls close method of the
* associated IO object. Returns the associated IO object.
*/
static VALUE
rb_gzfile_close(VALUE obj)
{
struct gzfile *gz = get_gzfile(obj);
VALUE io;
io = gz->io;
gzfile_close(gz, 1);
return io;
}
/*
* Closes the GzipFile object. Unlike Zlib::GzipFile#close, this method never
* calls the close method of the associated IO object. Returns the associated IO
* object.
*/
static VALUE
rb_gzfile_finish(VALUE obj)
{
struct gzfile *gz = get_gzfile(obj);
VALUE io;
io = gz->io;
gzfile_close(gz, 0);
return io;
}
/*
* Same as IO.
*/
static VALUE
rb_gzfile_closed_p(VALUE obj)
{
struct gzfile *gz;
Data_Get_Struct(obj, struct gzfile, gz);
return NIL_P(gz->io) ? Qtrue : Qfalse;
}
/*
* ???
*/
static VALUE
rb_gzfile_eof_p(VALUE obj)
{
struct gzfile *gz = get_gzfile(obj);
return GZFILE_IS_FINISHED(gz) ? Qtrue : Qfalse;
}
/*
* Same as IO.
*/
static VALUE
rb_gzfile_sync(VALUE obj)
{
return (get_gzfile(obj)->z.flags & GZFILE_FLAG_SYNC) ? Qtrue : Qfalse;
}
/*
* call-seq: sync = flag
*
* Same as IO. If flag is +true+, the associated IO object must respond to the
* +flush+ method. While +sync+ mode is +true+, the compression ratio
* decreases sharply.
*/
static VALUE
rb_gzfile_set_sync(VALUE obj, VALUE mode)
{
struct gzfile *gz = get_gzfile(obj);
if (RTEST(mode)) {
gz->z.flags |= GZFILE_FLAG_SYNC;
}
else {
gz->z.flags &= ~GZFILE_FLAG_SYNC;
}
return mode;
}
/*
* ???
*/
static VALUE
rb_gzfile_total_in(VALUE obj)
{
return rb_uint2inum(get_gzfile(obj)->z.stream.total_in);
}
/*
* ???
*/
static VALUE
rb_gzfile_total_out(VALUE obj)
{
struct gzfile *gz = get_gzfile(obj);
return rb_uint2inum(gz->z.stream.total_out - gz->z.buf_filled);
}
/*
* Document-method: path
*
* call-seq: path
*
* Returns the path string of the associated IO-like object. This
* method is only defined when the IO-like object responds to #path().
*/
static VALUE
rb_gzfile_path(VALUE obj)
{
struct gzfile *gz;
Data_Get_Struct(obj, struct gzfile, gz);
return gz->path;
}
static void
rb_gzfile_ecopts(struct gzfile *gz, VALUE opts)
{
if (!NIL_P(opts)) {
rb_io_extract_encoding_option(opts, &gz->enc, &gz->enc2, NULL);
}
if (gz->enc2) {
gz->ecflags = rb_econv_prepare_opts(opts, &opts);
gz->ec = rb_econv_open_opts(gz->enc2->name, gz->enc->name,
gz->ecflags, opts);
gz->ecopts = opts;
}
}
/* ------------------------------------------------------------------------- */
/*
* Document-class: Zlib::GzipWriter
*
* Zlib::GzipWriter is a class for writing gzipped files. GzipWriter should
* be used with an instance of IO, or IO-like, object.
*
* Following two example generate the same result.
*
* Zlib::GzipWriter.open('hoge.gz') do |gz|
* gz.write 'jugemu jugemu gokou no surikire...'
* end
*
* File.open('hoge.gz', 'w') do |f|
* gz = Zlib::GzipWriter.new(f)
* gz.write 'jugemu jugemu gokou no surikire...'
* gz.close
* end
*
* To make like gzip(1) does, run following:
*
* orig = 'hoge.txt'
* Zlib::GzipWriter.open('hoge.gz') do |gz|
* gz.mtime = File.mtime(orig)
* gz.orig_name = orig
* gz.write IO.binread(orig)
* end
*
* NOTE: Due to the limitation of Ruby's finalizer, you must explicitly close
* GzipWriter objects by Zlib::GzipWriter#close etc. Otherwise, GzipWriter
* will be not able to write the gzip footer and will generate a broken gzip
* file.
*/
static VALUE
rb_gzwriter_s_allocate(VALUE klass)
{
return gzfile_writer_new(klass);
}
/*
* call-seq: Zlib::GzipWriter.open(filename, level=nil, strategy=nil) { |gz| ... }
*
* Opens a file specified by +filename+ for writing gzip compressed data, and
* returns a GzipWriter object associated with that file. Further details of
* this method are found in Zlib::GzipWriter.new and Zlib::GzipFile.wrap.
*/
static VALUE
rb_gzwriter_s_open(int argc, VALUE *argv, VALUE klass)
{
return gzfile_s_open(argc, argv, klass, "wb");
}
/*
* call-seq: Zlib::GzipWriter.new(io, level, strategy)
*
* Creates a GzipWriter object associated with +io+. +level+ and +strategy+
* should be the same as the arguments of Zlib::Deflate.new. The GzipWriter
* object writes gzipped data to +io+. At least, +io+ must respond to the
* +write+ method that behaves same as write method in IO class.
*/
static VALUE
rb_gzwriter_initialize(int argc, VALUE *argv, VALUE obj)
{
struct gzfile *gz;
VALUE io, level, strategy, opt = Qnil;
int err;
if (argc > 1) {
opt = rb_check_convert_type(argv[argc-1], T_HASH, "Hash", "to_hash");
if (!NIL_P(opt)) argc--;
}
rb_scan_args(argc, argv, "12", &io, &level, &strategy);
Data_Get_Struct(obj, struct gzfile, gz);
/* this is undocumented feature of zlib */
gz->level = ARG_LEVEL(level);
err = deflateInit2(&gz->z.stream, gz->level, Z_DEFLATED,
-MAX_WBITS, DEF_MEM_LEVEL, ARG_STRATEGY(strategy));
if (err != Z_OK) {
raise_zlib_error(err, gz->z.stream.msg);
}
gz->io = io;
ZSTREAM_READY(&gz->z);
rb_gzfile_ecopts(gz, opt);
if (rb_respond_to(io, id_path)) {
gz->path = rb_funcall(gz->io, id_path, 0);
rb_define_singleton_method(obj, "path", rb_gzfile_path, 0);
}
return obj;
}
/*
* call-seq: flush(flush=nil)
*
* Flushes all the internal buffers of the GzipWriter object. The meaning of
* +flush+ is same as in Zlib::Deflate#deflate. <tt>Zlib::SYNC_FLUSH</tt> is used if
* +flush+ is omitted. It is no use giving flush <tt>Zlib::NO_FLUSH</tt>.
*/
static VALUE
rb_gzwriter_flush(int argc, VALUE *argv, VALUE obj)
{
struct gzfile *gz = get_gzfile(obj);
VALUE v_flush;
int flush;
rb_scan_args(argc, argv, "01", &v_flush);
flush = FIXNUMARG(v_flush, Z_SYNC_FLUSH);
if (flush != Z_NO_FLUSH) { /* prevent Z_BUF_ERROR */
zstream_run(&gz->z, (Bytef*)"", 0, flush);
}
gzfile_write_raw(gz);
if (rb_respond_to(gz->io, id_flush)) {
rb_funcall(gz->io, id_flush, 0);
}
return obj;
}
/*
* Same as IO.
*/
static VALUE
rb_gzwriter_write(VALUE obj, VALUE str)
{
struct gzfile *gz = get_gzfile(obj);
if (TYPE(str) != T_STRING)
str = rb_obj_as_string(str);
if (gz->enc2 && gz->enc2 != rb_ascii8bit_encoding()) {
str = rb_str_conv_enc(str, rb_enc_get(str), gz->enc2);
}
gzfile_write(gz, (Bytef*)RSTRING_PTR(str), RSTRING_LEN(str));
return INT2FIX(RSTRING_LEN(str));
}
/*
* Same as IO.
*/
static VALUE
rb_gzwriter_putc(VALUE obj, VALUE ch)
{
struct gzfile *gz = get_gzfile(obj);
char c = NUM2CHR(ch);
gzfile_write(gz, (Bytef*)&c, 1);
return ch;
}
/*
* Document-method: <<
* Same as IO.
*/
#define rb_gzwriter_addstr rb_io_addstr
/*
* Document-method: printf
* Same as IO.
*/
#define rb_gzwriter_printf rb_io_printf
/*
* Document-method: print
* Same as IO.
*/
#define rb_gzwriter_print rb_io_print
/*
* Document-method: puts
* Same as IO.
*/
#define rb_gzwriter_puts rb_io_puts
/* ------------------------------------------------------------------------- */
/*
* Document-class: Zlib::GzipReader
*
* Zlib::GzipReader is the class for reading a gzipped file. GzipReader should
* be used an IO, or -IO-lie, object.
*
* Zlib::GzipReader.open('hoge.gz') {|gz|
* print gz.read
* }
*
* File.open('hoge.gz') do |f|
* gz = Zlib::GzipReader.new(f)
* print gz.read
* gz.close
* end
*
* # TODO: test these. Are they equivalent? Can GzipReader.new take a
* # block?
*
* == Method Catalogue
*
* The following methods in Zlib::GzipReader are just like their counterparts
* in IO, but they raise Zlib::Error or Zlib::GzipFile::Error exception if an
* error was found in the gzip file.
* - #each
* - #each_line
* - #each_byte
* - #gets
* - #getc
* - #lineno
* - #lineno=
* - #read
* - #readchar
* - #readline
* - #readlines
* - #ungetc
*
* Be careful of the footer of the gzip file. A gzip file has the checksum of
* pre-compressed data in its footer. GzipReader checks all uncompressed data
* against that checksum at the following cases, and if it fails, raises
* <tt>Zlib::GzipFile::NoFooter</tt>, <tt>Zlib::GzipFile::CRCError</tt>, or
* <tt>Zlib::GzipFile::LengthError</tt> exception.
*
* - When an reading request is received beyond the end of file (the end of
* compressed data). That is, when Zlib::GzipReader#read,
* Zlib::GzipReader#gets, or some other methods for reading returns nil.
* - When Zlib::GzipFile#close method is called after the object reaches the
* end of file.
* - When Zlib::GzipReader#unused method is called after the object reaches
* the end of file.
*
* The rest of the methods are adequately described in their own
* documentation.
*/
static VALUE
rb_gzreader_s_allocate(VALUE klass)
{
return gzfile_reader_new(klass);
}
/*
* call-seq: Zlib::GzipReader.open(filename) {|gz| ... }
*
* Opens a file specified by +filename+ as a gzipped file, and returns a
* GzipReader object associated with that file. Further details of this method
* are in Zlib::GzipReader.new and ZLib::GzipFile.wrap.
*/
static VALUE
rb_gzreader_s_open(int argc, VALUE *argv, VALUE klass)
{
return gzfile_s_open(argc, argv, klass, "rb");
}
/*
* call-seq: Zlib::GzipReader.new(io)
*
* Creates a GzipReader object associated with +io+. The GzipReader object reads
* gzipped data from +io+, and parses/decompresses them. At least, +io+ must have
* a +read+ method that behaves same as the +read+ method in IO class.
*
* If the gzip file header is incorrect, raises an Zlib::GzipFile::Error
* exception.
*/
static VALUE
rb_gzreader_initialize(int argc, VALUE *argv, VALUE obj)
{
VALUE io, opt = Qnil;
struct gzfile *gz;
int err;
Data_Get_Struct(obj, struct gzfile, gz);
rb_scan_args(argc, argv, "1:", &io, &opt);
/* this is undocumented feature of zlib */
err = inflateInit2(&gz->z.stream, -MAX_WBITS);
if (err != Z_OK) {
raise_zlib_error(err, gz->z.stream.msg);
}
gz->io = io;
ZSTREAM_READY(&gz->z);
gzfile_read_header(gz);
rb_gzfile_ecopts(gz, opt);
if (rb_respond_to(io, id_path)) {
gz->path = rb_funcall(gz->io, id_path, 0);
rb_define_singleton_method(obj, "path", rb_gzfile_path, 0);
}
return obj;
}
/*
* Resets the position of the file pointer to the point created the GzipReader
* object. The associated IO object needs to respond to the +seek+ method.
*/
static VALUE
rb_gzreader_rewind(VALUE obj)
{
struct gzfile *gz = get_gzfile(obj);
gzfile_reader_rewind(gz);
return INT2FIX(0);
}
/*
* Returns the rest of the data which had read for parsing gzip format, or
* +nil+ if the whole gzip file is not parsed yet.
*/
static VALUE
rb_gzreader_unused(VALUE obj)
{
struct gzfile *gz;
Data_Get_Struct(obj, struct gzfile, gz);
return gzfile_reader_get_unused(gz);
}
/*
* See Zlib::GzipReader documentation for a description.
*/
static VALUE
rb_gzreader_read(int argc, VALUE *argv, VALUE obj)
{
struct gzfile *gz = get_gzfile(obj);
VALUE vlen;
long len;
rb_scan_args(argc, argv, "01", &vlen);
if (NIL_P(vlen)) {
return gzfile_read_all(gz);
}
len = NUM2INT(vlen);
if (len < 0) {
rb_raise(rb_eArgError, "negative length %ld given", len);
}
return gzfile_read(gz, len);
}
/*
* call-seq:
* gzipreader.readpartial(maxlen [, outbuf]) => string, outbuf
*
* Reads at most <i>maxlen</i> bytes from the gziped stream but
* it blocks only if <em>gzipreader</em> has no data immediately available.
* If the optional <i>outbuf</i> argument is present,
* it must reference a String, which will receive the data.
* It raises <code>EOFError</code> on end of file.
*/
static VALUE
rb_gzreader_readpartial(int argc, VALUE *argv, VALUE obj)
{
struct gzfile *gz = get_gzfile(obj);
VALUE vlen, outbuf;
long len;
rb_scan_args(argc, argv, "11", &vlen, &outbuf);
len = NUM2INT(vlen);
if (len < 0) {
rb_raise(rb_eArgError, "negative length %ld given", len);
}
if (!NIL_P(outbuf))
Check_Type(outbuf, T_STRING);
return gzfile_readpartial(gz, len, outbuf);
}
/*
* See Zlib::GzipReader documentation for a description.
*/
static VALUE
rb_gzreader_getc(VALUE obj)
{
struct gzfile *gz = get_gzfile(obj);
return gzfile_getc(gz);
}
/*
* See Zlib::GzipReader documentation for a description.
*/
static VALUE
rb_gzreader_readchar(VALUE obj)
{
VALUE dst;
dst = rb_gzreader_getc(obj);
if (NIL_P(dst)) {
rb_raise(rb_eEOFError, "end of file reached");
}
return dst;
}
/*
* See Zlib::GzipReader documentation for a description.
*/
static VALUE
rb_gzreader_getbyte(VALUE obj)
{
struct gzfile *gz = get_gzfile(obj);
VALUE dst;
dst = gzfile_read(gz, 1);
if (!NIL_P(dst)) {
dst = INT2FIX((unsigned int)(RSTRING_PTR(dst)[0]) & 0xff);
}
return dst;
}
/*
* See Zlib::GzipReader documentation for a description.
*/
static VALUE
rb_gzreader_readbyte(VALUE obj)
{
VALUE dst;
dst = rb_gzreader_getbyte(obj);
if (NIL_P(dst)) {
rb_raise(rb_eEOFError, "end of file reached");
}
return dst;
}
/*
* See Zlib::GzipReader documentation for a description.
*/
static VALUE
rb_gzreader_each_char(VALUE obj)
{
VALUE c;
RETURN_ENUMERATOR(obj, 0, 0);
while (!NIL_P(c = rb_gzreader_getc(obj))) {
rb_yield(c);
}
return Qnil;
}
/*
* See Zlib::GzipReader documentation for a description.
*/
static VALUE
rb_gzreader_each_byte(VALUE obj)
{
VALUE c;
RETURN_ENUMERATOR(obj, 0, 0);
while (!NIL_P(c = rb_gzreader_getbyte(obj))) {
rb_yield(c);
}
return Qnil;
}
/*
* See Zlib::GzipReader documentation for a description.
*/
static VALUE
rb_gzreader_ungetc(VALUE obj, VALUE s)
{
struct gzfile *gz;
if (FIXNUM_P(s))
return rb_gzreader_ungetbyte(obj, s);
gz = get_gzfile(obj);
StringValue(s);
if (gz->enc2 && gz->enc2 != rb_ascii8bit_encoding()) {
s = rb_str_conv_enc(s, rb_enc_get(s), gz->enc2);
}
gzfile_ungets(gz, (const Bytef*)RSTRING_PTR(s), RSTRING_LEN(s));
return Qnil;
}
/*
* See Zlib::GzipReader documentation for a description.
*/
static VALUE
rb_gzreader_ungetbyte(VALUE obj, VALUE ch)
{
struct gzfile *gz = get_gzfile(obj);
gzfile_ungetbyte(gz, NUM2CHR(ch));
return Qnil;
}
static void
gzreader_skip_linebreaks(struct gzfile *gz)
{
VALUE str;
char *p;
int n;
while (gz->z.buf_filled == 0) {
if (GZFILE_IS_FINISHED(gz)) return;
gzfile_read_more(gz);
}
n = 0;
p = RSTRING_PTR(gz->z.buf);
while (n++, *(p++) == '\n') {
if (n >= gz->z.buf_filled) {
str = zstream_detach_buffer(&gz->z);
gzfile_calc_crc(gz, str);
while (gz->z.buf_filled == 0) {
if (GZFILE_IS_FINISHED(gz)) return;
gzfile_read_more(gz);
}
n = 0;
p = RSTRING_PTR(gz->z.buf);
}
}
str = zstream_shift_buffer(&gz->z, n - 1);
gzfile_calc_crc(gz, str);
}
static void
rscheck(const char *rsptr, long rslen, VALUE rs)
{
if (RSTRING_PTR(rs) != rsptr && RSTRING_LEN(rs) != rslen)
rb_raise(rb_eRuntimeError, "rs modified");
}
static long
gzreader_charboundary(struct gzfile *gz, long n)
{
char *s = RSTRING_PTR(gz->z.buf);
char *e = s + gz->z.buf_filled;
char *p = rb_enc_left_char_head(s, s + n, e, gz->enc);
long l = p - s;
if (l < n) {
n = rb_enc_precise_mbclen(p, e, gz->enc);
if (MBCLEN_NEEDMORE_P(n)) {
if ((l = gzfile_fill(gz, l + MBCLEN_NEEDMORE_LEN(n))) > 0) {
return l;
}
}
else if (MBCLEN_CHARFOUND_P(n)) {
return l + MBCLEN_CHARFOUND_LEN(n);
}
}
return n;
}
static VALUE
gzreader_gets(int argc, VALUE *argv, VALUE obj)
{
struct gzfile *gz = get_gzfile(obj);
volatile VALUE rs;
VALUE dst;
const char *rsptr;
char *p, *res;
long rslen, n, limit = -1;
int rspara;
rb_encoding *enc = gz->enc;
int maxlen = rb_enc_mbmaxlen(enc);
if (argc == 0) {
rs = rb_rs;
}
else {
VALUE lim, tmp;
rb_scan_args(argc, argv, "11", &rs, &lim);
if (!NIL_P(lim)) {
if (!NIL_P(rs)) StringValue(rs);
}
else if (!NIL_P(rs)) {
tmp = rb_check_string_type(rs);
if (NIL_P(tmp)) {
lim = rs;
rs = rb_rs;
}
else {
rs = tmp;
}
}
if (!NIL_P(lim)) {
limit = NUM2LONG(lim);
if (limit == 0) return rb_str_new(0,0);
}
}
if (NIL_P(rs)) {
if (limit < 0) {
dst = gzfile_read_all(gz);
if (RSTRING_LEN(dst) == 0) return Qnil;
}
else if ((n = gzfile_fill(gz, limit)) <= 0) {
return Qnil;
}
else {
if (maxlen > 1 && n >= limit && !GZFILE_IS_FINISHED(gz)) {
n = gzreader_charboundary(gz, n);
}
else {
n = limit;
}
dst = zstream_shift_buffer(&gz->z, n);
gzfile_calc_crc(gz, dst);
dst = gzfile_newstr(gz, dst);
}
gz->lineno++;
return dst;
}
if (RSTRING_LEN(rs) == 0) {
rsptr = "\n\n";
rslen = 2;
rspara = 1;
} else {
rsptr = RSTRING_PTR(rs);
rslen = RSTRING_LEN(rs);
rspara = 0;
}
if (rspara) {
gzreader_skip_linebreaks(gz);
}
while (gz->z.buf_filled < rslen) {
if (ZSTREAM_IS_FINISHED(&gz->z)) {
if (gz->z.buf_filled > 0) gz->lineno++;
return gzfile_read(gz, rslen);
}
gzfile_read_more(gz);
}
p = RSTRING_PTR(gz->z.buf);
n = rslen;
for (;;) {
long filled;
if (n > gz->z.buf_filled) {
if (ZSTREAM_IS_FINISHED(&gz->z)) break;
gzfile_read_more(gz);
p = RSTRING_PTR(gz->z.buf) + n - rslen;
}
if (!rspara) rscheck(rsptr, rslen, rs);
filled = gz->z.buf_filled;
if (limit > 0 && filled >= limit) {
filled = limit;
}
res = memchr(p, rsptr[0], (filled - n + 1));
if (!res) {
n = filled;
if (limit > 0 && filled >= limit) break;
n++;
} else {
n += (long)(res - p);
p = res;
if (rslen == 1 || memcmp(p, rsptr, rslen) == 0) break;
p++, n++;
}
}
if (maxlen > 1 && n == limit && (gz->z.buf_filled > n || !ZSTREAM_IS_FINISHED(&gz->z))) {
n = gzreader_charboundary(gz, n);
}
gz->lineno++;
dst = gzfile_read(gz, n);
if (rspara) {
gzreader_skip_linebreaks(gz);
}
return gzfile_newstr(gz, dst);
}
/*
* See Zlib::GzipReader documentation for a description.
*/
static VALUE
rb_gzreader_gets(int argc, VALUE *argv, VALUE obj)
{
VALUE dst;
dst = gzreader_gets(argc, argv, obj);
if (!NIL_P(dst)) {
rb_lastline_set(dst);
}
return dst;
}
/*
* See Zlib::GzipReader documentation for a description.
*/
static VALUE
rb_gzreader_readline(int argc, VALUE *argv, VALUE obj)
{
VALUE dst;
dst = rb_gzreader_gets(argc, argv, obj);
if (NIL_P(dst)) {
rb_raise(rb_eEOFError, "end of file reached");
}
return dst;
}
/*
* See Zlib::GzipReader documentation for a description.
*/
static VALUE
rb_gzreader_each(int argc, VALUE *argv, VALUE obj)
{
VALUE str;
RETURN_ENUMERATOR(obj, 0, 0);
while (!NIL_P(str = gzreader_gets(argc, argv, obj))) {
rb_yield(str);
}
return obj;
}
/*
* See Zlib::GzipReader documentation for a description.
*/
static VALUE
rb_gzreader_readlines(int argc, VALUE *argv, VALUE obj)
{
VALUE str, dst;
dst = rb_ary_new();
while (!NIL_P(str = gzreader_gets(argc, argv, obj))) {
rb_ary_push(dst, str);
}
return dst;
}
#endif /* GZIP_SUPPORT */
/*
* The Zlib module contains several classes for compressing and decompressing
* streams, and for working with "gzip" files.
*
* == Classes
*
* Following are the classes that are most likely to be of interest to the
* user:
* Zlib::Inflate
* Zlib::Deflate
* Zlib::GzipReader
* Zlib::GzipWriter
*
* There are two important base classes for the classes above: Zlib::ZStream
* and Zlib::GzipFile. Everything else is an error class.
*
* == Constants
*
* Here's a list.
*
* Zlib::VERSION
* The Ruby/zlib version string.
*
* Zlib::ZLIB_VERSION
* The string which represents the version of zlib.h.
*
* Zlib::BINARY
* Zlib::ASCII
* Zlib::UNKNOWN
* The integers representing data types which Zlib::ZStream#data_type
* method returns.
*
* Zlib::NO_COMPRESSION
* Zlib::BEST_SPEED
* Zlib::BEST_COMPRESSION
* Zlib::DEFAULT_COMPRESSION
* The integers representing compression levels which are an argument
* for Zlib::Deflate.new, Zlib::Deflate#deflate, and so on.
*
* Zlib::FILTERED
* Zlib::HUFFMAN_ONLY
* Zlib::DEFAULT_STRATEGY
* The integers representing compression methods which are an argument
* for Zlib::Deflate.new and Zlib::Deflate#params.
*
* Zlib::DEF_MEM_LEVEL
* Zlib::MAX_MEM_LEVEL
* The integers representing memory levels which are an argument for
* Zlib::Deflate.new, Zlib::Deflate#params, and so on.
*
* Zlib::MAX_WBITS
* The default value of windowBits which is an argument for
* Zlib::Deflate.new and Zlib::Inflate.new.
*
* Zlib::NO_FLUSH
* Zlib::SYNC_FLUSH
* Zlib::FULL_FLUSH
* Zlib::FINISH
* The integers to control the output of the deflate stream, which are
* an argument for Zlib::Deflate#deflate and so on.
*
* Zlib::OS_CODE
* Zlib::OS_MSDOS
* Zlib::OS_AMIGA
* Zlib::OS_VMS
* Zlib::OS_UNIX
* Zlib::OS_VMCMS
* Zlib::OS_ATARI
* Zlib::OS_OS2
* Zlib::OS_MACOS
* Zlib::OS_ZSYSTEM
* Zlib::OS_CPM
* Zlib::OS_TOPS20
* Zlib::OS_WIN32
* Zlib::OS_QDOS
* Zlib::OS_RISCOS
* Zlib::OS_UNKNOWN
* The return values of Zlib::GzipFile#os_code method.
*/
void
Init_zlib()
{
VALUE mZlib, cZStream, cDeflate, cInflate;
#if GZIP_SUPPORT
VALUE cGzipFile, cGzipWriter, cGzipReader;
#endif
mZlib = rb_define_module("Zlib");
cZError = rb_define_class_under(mZlib, "Error", rb_eStandardError);
cStreamEnd = rb_define_class_under(mZlib, "StreamEnd", cZError);
cNeedDict = rb_define_class_under(mZlib, "NeedDict", cZError);
cDataError = rb_define_class_under(mZlib, "DataError", cZError);
cStreamError = rb_define_class_under(mZlib, "StreamError", cZError);
cMemError = rb_define_class_under(mZlib, "MemError", cZError);
cBufError = rb_define_class_under(mZlib, "BufError", cZError);
cVersionError = rb_define_class_under(mZlib, "VersionError", cZError);
rb_define_module_function(mZlib, "zlib_version", rb_zlib_version, 0);
rb_define_module_function(mZlib, "adler32", rb_zlib_adler32, -1);
rb_define_module_function(mZlib, "adler32_combine", rb_zlib_adler32_combine, 3);
rb_define_module_function(mZlib, "crc32", rb_zlib_crc32, -1);
rb_define_module_function(mZlib, "crc32_combine", rb_zlib_crc32_combine, 3);
rb_define_module_function(mZlib, "crc_table", rb_zlib_crc_table, 0);
rb_define_const(mZlib, "VERSION", rb_str_new2(RUBY_ZLIB_VERSION));
rb_define_const(mZlib, "ZLIB_VERSION", rb_str_new2(ZLIB_VERSION));
cZStream = rb_define_class_under(mZlib, "ZStream", rb_cObject);
rb_undef_alloc_func(cZStream);
rb_define_method(cZStream, "avail_out", rb_zstream_avail_out, 0);
rb_define_method(cZStream, "avail_out=", rb_zstream_set_avail_out, 1);
rb_define_method(cZStream, "avail_in", rb_zstream_avail_in, 0);
rb_define_method(cZStream, "total_in", rb_zstream_total_in, 0);
rb_define_method(cZStream, "total_out", rb_zstream_total_out, 0);
rb_define_method(cZStream, "data_type", rb_zstream_data_type, 0);
rb_define_method(cZStream, "adler", rb_zstream_adler, 0);
rb_define_method(cZStream, "finished?", rb_zstream_finished_p, 0);
rb_define_method(cZStream, "stream_end?", rb_zstream_finished_p, 0);
rb_define_method(cZStream, "closed?", rb_zstream_closed_p, 0);
rb_define_method(cZStream, "ended?", rb_zstream_closed_p, 0);
rb_define_method(cZStream, "close", rb_zstream_end, 0);
rb_define_method(cZStream, "end", rb_zstream_end, 0);
rb_define_method(cZStream, "reset", rb_zstream_reset, 0);
rb_define_method(cZStream, "finish", rb_zstream_finish, 0);
rb_define_method(cZStream, "flush_next_in", rb_zstream_flush_next_in, 0);
rb_define_method(cZStream, "flush_next_out", rb_zstream_flush_next_out, 0);
rb_define_const(mZlib, "BINARY", INT2FIX(Z_BINARY));
rb_define_const(mZlib, "ASCII", INT2FIX(Z_ASCII));
rb_define_const(mZlib, "UNKNOWN", INT2FIX(Z_UNKNOWN));
cDeflate = rb_define_class_under(mZlib, "Deflate", cZStream);
rb_define_singleton_method(cDeflate, "deflate", rb_deflate_s_deflate, -1);
rb_define_singleton_method(mZlib, "deflate", rb_deflate_s_deflate, -1);
rb_define_alloc_func(cDeflate, rb_deflate_s_allocate);
rb_define_method(cDeflate, "initialize", rb_deflate_initialize, -1);
rb_define_method(cDeflate, "initialize_copy", rb_deflate_init_copy, 1);
rb_define_method(cDeflate, "deflate", rb_deflate_deflate, -1);
rb_define_method(cDeflate, "<<", rb_deflate_addstr, 1);
rb_define_method(cDeflate, "flush", rb_deflate_flush, -1);
rb_define_method(cDeflate, "params", rb_deflate_params, 2);
rb_define_method(cDeflate, "set_dictionary", rb_deflate_set_dictionary, 1);
cInflate = rb_define_class_under(mZlib, "Inflate", cZStream);
rb_define_singleton_method(cInflate, "inflate", rb_inflate_s_inflate, 1);
rb_define_singleton_method(mZlib, "inflate", rb_inflate_s_inflate, 1);
rb_define_alloc_func(cInflate, rb_inflate_s_allocate);
rb_define_method(cInflate, "initialize", rb_inflate_initialize, -1);
rb_define_method(cInflate, "inflate", rb_inflate_inflate, 1);
rb_define_method(cInflate, "<<", rb_inflate_addstr, 1);
rb_define_method(cInflate, "sync", rb_inflate_sync, 1);
rb_define_method(cInflate, "sync_point?", rb_inflate_sync_point_p, 0);
rb_define_method(cInflate, "set_dictionary", rb_inflate_set_dictionary, 1);
rb_define_const(mZlib, "NO_COMPRESSION", INT2FIX(Z_NO_COMPRESSION));
rb_define_const(mZlib, "BEST_SPEED", INT2FIX(Z_BEST_SPEED));
rb_define_const(mZlib, "BEST_COMPRESSION", INT2FIX(Z_BEST_COMPRESSION));
rb_define_const(mZlib, "DEFAULT_COMPRESSION",
INT2FIX(Z_DEFAULT_COMPRESSION));
rb_define_const(mZlib, "FILTERED", INT2FIX(Z_FILTERED));
rb_define_const(mZlib, "HUFFMAN_ONLY", INT2FIX(Z_HUFFMAN_ONLY));
rb_define_const(mZlib, "DEFAULT_STRATEGY", INT2FIX(Z_DEFAULT_STRATEGY));
rb_define_const(mZlib, "MAX_WBITS", INT2FIX(MAX_WBITS));
rb_define_const(mZlib, "DEF_MEM_LEVEL", INT2FIX(DEF_MEM_LEVEL));
rb_define_const(mZlib, "MAX_MEM_LEVEL", INT2FIX(MAX_MEM_LEVEL));
rb_define_const(mZlib, "NO_FLUSH", INT2FIX(Z_NO_FLUSH));
rb_define_const(mZlib, "SYNC_FLUSH", INT2FIX(Z_SYNC_FLUSH));
rb_define_const(mZlib, "FULL_FLUSH", INT2FIX(Z_FULL_FLUSH));
rb_define_const(mZlib, "FINISH", INT2FIX(Z_FINISH));
#if GZIP_SUPPORT
id_write = rb_intern("write");
id_read = rb_intern("read");
id_readpartial = rb_intern("readpartial");
id_flush = rb_intern("flush");
id_seek = rb_intern("seek");
id_close = rb_intern("close");
id_path = rb_intern("path");
id_input = rb_intern("@input");
cGzipFile = rb_define_class_under(mZlib, "GzipFile", rb_cObject);
cGzError = rb_define_class_under(cGzipFile, "Error", cZError);
rb_define_attr(cGzError, "input", 1, 0);
rb_define_method(cGzError, "inspect", gzfile_error_inspect, 0);
cNoFooter = rb_define_class_under(cGzipFile, "NoFooter", cGzError);
cCRCError = rb_define_class_under(cGzipFile, "CRCError", cGzError);
cLengthError = rb_define_class_under(cGzipFile,"LengthError",cGzError);
cGzipWriter = rb_define_class_under(mZlib, "GzipWriter", cGzipFile);
cGzipReader = rb_define_class_under(mZlib, "GzipReader", cGzipFile);
rb_include_module(cGzipReader, rb_mEnumerable);
rb_define_singleton_method(cGzipFile, "wrap", rb_gzfile_s_wrap, -1);
rb_undef_alloc_func(cGzipFile);
rb_define_method(cGzipFile, "to_io", rb_gzfile_to_io, 0);
rb_define_method(cGzipFile, "crc", rb_gzfile_crc, 0);
rb_define_method(cGzipFile, "mtime", rb_gzfile_mtime, 0);
rb_define_method(cGzipFile, "level", rb_gzfile_level, 0);
rb_define_method(cGzipFile, "os_code", rb_gzfile_os_code, 0);
rb_define_method(cGzipFile, "orig_name", rb_gzfile_orig_name, 0);
rb_define_method(cGzipFile, "comment", rb_gzfile_comment, 0);
rb_define_method(cGzipReader, "lineno", rb_gzfile_lineno, 0);
rb_define_method(cGzipReader, "lineno=", rb_gzfile_set_lineno, 1);
rb_define_method(cGzipWriter, "mtime=", rb_gzfile_set_mtime, 1);
rb_define_method(cGzipWriter, "orig_name=", rb_gzfile_set_orig_name,1);
rb_define_method(cGzipWriter, "comment=", rb_gzfile_set_comment, 1);
rb_define_method(cGzipFile, "close", rb_gzfile_close, 0);
rb_define_method(cGzipFile, "finish", rb_gzfile_finish, 0);
rb_define_method(cGzipFile, "closed?", rb_gzfile_closed_p, 0);
rb_define_method(cGzipReader, "eof", rb_gzfile_eof_p, 0);
rb_define_method(cGzipReader, "eof?", rb_gzfile_eof_p, 0);
rb_define_method(cGzipFile, "sync", rb_gzfile_sync, 0);
rb_define_method(cGzipFile, "sync=", rb_gzfile_set_sync, 1);
rb_define_method(cGzipReader, "pos", rb_gzfile_total_out, 0);
rb_define_method(cGzipWriter, "pos", rb_gzfile_total_in, 0);
rb_define_method(cGzipReader, "tell", rb_gzfile_total_out, 0);
rb_define_method(cGzipWriter, "tell", rb_gzfile_total_in, 0);
rb_define_singleton_method(cGzipWriter, "open", rb_gzwriter_s_open,-1);
rb_define_alloc_func(cGzipWriter, rb_gzwriter_s_allocate);
rb_define_method(cGzipWriter, "initialize", rb_gzwriter_initialize,-1);
rb_define_method(cGzipWriter, "flush", rb_gzwriter_flush, -1);
rb_define_method(cGzipWriter, "write", rb_gzwriter_write, 1);
rb_define_method(cGzipWriter, "putc", rb_gzwriter_putc, 1);
rb_define_method(cGzipWriter, "<<", rb_gzwriter_addstr, 1);
rb_define_method(cGzipWriter, "printf", rb_gzwriter_printf, -1);
rb_define_method(cGzipWriter, "print", rb_gzwriter_print, -1);
rb_define_method(cGzipWriter, "puts", rb_gzwriter_puts, -1);
rb_define_singleton_method(cGzipReader, "open", rb_gzreader_s_open,-1);
rb_define_alloc_func(cGzipReader, rb_gzreader_s_allocate);
rb_define_method(cGzipReader, "initialize", rb_gzreader_initialize, -1);
rb_define_method(cGzipReader, "rewind", rb_gzreader_rewind, 0);
rb_define_method(cGzipReader, "unused", rb_gzreader_unused, 0);
rb_define_method(cGzipReader, "read", rb_gzreader_read, -1);
rb_define_method(cGzipReader, "readpartial", rb_gzreader_readpartial, -1);
rb_define_method(cGzipReader, "getc", rb_gzreader_getc, 0);
rb_define_method(cGzipReader, "getbyte", rb_gzreader_getbyte, 0);
rb_define_method(cGzipReader, "readchar", rb_gzreader_readchar, 0);
rb_define_method(cGzipReader, "readbyte", rb_gzreader_readbyte, 0);
rb_define_method(cGzipReader, "each_byte", rb_gzreader_each_byte, 0);
rb_define_method(cGzipReader, "each_char", rb_gzreader_each_char, 0);
rb_define_method(cGzipReader, "bytes", rb_gzreader_each_byte, 0);
rb_define_method(cGzipReader, "ungetc", rb_gzreader_ungetc, 1);
rb_define_method(cGzipReader, "ungetbyte", rb_gzreader_ungetbyte, 1);
rb_define_method(cGzipReader, "gets", rb_gzreader_gets, -1);
rb_define_method(cGzipReader, "readline", rb_gzreader_readline, -1);
rb_define_method(cGzipReader, "each", rb_gzreader_each, -1);
rb_define_method(cGzipReader, "each_line", rb_gzreader_each, -1);
rb_define_method(cGzipReader, "lines", rb_gzreader_each, -1);
rb_define_method(cGzipReader, "readlines", rb_gzreader_readlines, -1);
rb_define_const(mZlib, "OS_CODE", INT2FIX(OS_CODE));
rb_define_const(mZlib, "OS_MSDOS", INT2FIX(OS_MSDOS));
rb_define_const(mZlib, "OS_AMIGA", INT2FIX(OS_AMIGA));
rb_define_const(mZlib, "OS_VMS", INT2FIX(OS_VMS));
rb_define_const(mZlib, "OS_UNIX", INT2FIX(OS_UNIX));
rb_define_const(mZlib, "OS_ATARI", INT2FIX(OS_ATARI));
rb_define_const(mZlib, "OS_OS2", INT2FIX(OS_OS2));
rb_define_const(mZlib, "OS_MACOS", INT2FIX(OS_MACOS));
rb_define_const(mZlib, "OS_TOPS20", INT2FIX(OS_TOPS20));
rb_define_const(mZlib, "OS_WIN32", INT2FIX(OS_WIN32));
rb_define_const(mZlib, "OS_VMCMS", INT2FIX(OS_VMCMS));
rb_define_const(mZlib, "OS_ZSYSTEM", INT2FIX(OS_ZSYSTEM));
rb_define_const(mZlib, "OS_CPM", INT2FIX(OS_CPM));
rb_define_const(mZlib, "OS_QDOS", INT2FIX(OS_QDOS));
rb_define_const(mZlib, "OS_RISCOS", INT2FIX(OS_RISCOS));
rb_define_const(mZlib, "OS_UNKNOWN", INT2FIX(OS_UNKNOWN));
#endif /* GZIP_SUPPORT */
}
/* Document error classes. */
/*
* Document-class: Zlib::Error
*
* The superclass for all exceptions raised by Ruby/zlib.
*
* The following exceptions are defined as subclasses of Zlib::Error. These
* exceptions are raised when zlib library functions return with an error
* status.
*
* - Zlib::StreamEnd
* - Zlib::NeedDict
* - Zlib::DataError
* - Zlib::StreamError
* - Zlib::MemError
* - Zlib::BufError
* - Zlib::VersionError
*
*/
/*
* Document-class: Zlib::GzipFile::Error
*
* Base class of errors that occur when processing GZIP files.
*/
/*
* Document-class: Zlib::GzipFile::NoFooter
*
* Raised when gzip file footer is not found.
*/
/*
* Document-class: Zlib::GzipFile::CRCError
*
* Raised when the CRC checksum recorded in gzip file footer is not equivalent
* to the CRC checksum of the actual uncompressed data.
*/
/*
* Document-class: Zlib::GzipFile::LengthError
*
* Raised when the data length recorded in the gzip file footer is not equivalent
* to the length of the actual uncompressed data.
*/
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