mirror of
https://github.com/ruby/ruby.git
synced 2022-11-09 12:17:21 -05:00
411 lines
9.1 KiB
C
411 lines
9.1 KiB
C
#include "ruby.h"
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#include "ruby/encoding.h"
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RUBY_EXTERN unsigned long ruby_scan_digits(const char *str, ssize_t len, int base, size_t *retlen, int *overflow);
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RUBY_EXTERN const char ruby_hexdigits[];
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RUBY_EXTERN const signed char ruby_digit36_to_number_table[];
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#define lower_hexdigits (ruby_hexdigits+0)
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#define upper_hexdigits (ruby_hexdigits+16)
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#define char_to_number(c) ruby_digit36_to_number_table[(unsigned char)(c)]
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static VALUE rb_cCGI, rb_mUtil, rb_mEscape;
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static ID id_accept_charset;
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#define HTML_ESCAPE_MAX_LEN 6
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static const struct {
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uint8_t len;
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char str[HTML_ESCAPE_MAX_LEN+1];
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} html_escape_table[UCHAR_MAX+1] = {
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#define HTML_ESCAPE(c, str) [c] = {rb_strlen_lit(str), str}
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HTML_ESCAPE('\'', "'"),
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HTML_ESCAPE('&', "&"),
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HTML_ESCAPE('"', """),
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HTML_ESCAPE('<', "<"),
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HTML_ESCAPE('>', ">"),
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#undef HTML_ESCAPE
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};
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static inline void
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preserve_original_state(VALUE orig, VALUE dest)
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{
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rb_enc_associate(dest, rb_enc_get(orig));
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}
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static VALUE
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optimized_escape_html(VALUE str)
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{
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VALUE vbuf;
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char *buf = ALLOCV_N(char, vbuf, RSTRING_LEN(str) * HTML_ESCAPE_MAX_LEN);
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const char *cstr = RSTRING_PTR(str);
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const char *end = cstr + RSTRING_LEN(str);
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char *dest = buf;
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while (cstr < end) {
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const unsigned char c = *cstr++;
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uint8_t len = html_escape_table[c].len;
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if (len) {
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memcpy(dest, html_escape_table[c].str, len);
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dest += len;
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}
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else {
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*dest++ = c;
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}
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}
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VALUE escaped;
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if (RSTRING_LEN(str) < (dest - buf)) {
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escaped = rb_str_new(buf, dest - buf);
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preserve_original_state(str, escaped);
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}
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else {
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escaped = rb_str_dup(str);
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}
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ALLOCV_END(vbuf);
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return escaped;
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}
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static VALUE
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optimized_unescape_html(VALUE str)
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{
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enum {UNICODE_MAX = 0x10ffff};
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rb_encoding *enc = rb_enc_get(str);
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unsigned long charlimit = (strcasecmp(rb_enc_name(enc), "UTF-8") == 0 ? UNICODE_MAX :
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strcasecmp(rb_enc_name(enc), "ISO-8859-1") == 0 ? 256 :
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128);
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long i, len, beg = 0;
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size_t clen, plen;
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int overflow;
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const char *cstr;
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char buf[6];
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VALUE dest = 0;
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len = RSTRING_LEN(str);
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cstr = RSTRING_PTR(str);
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for (i = 0; i < len; i++) {
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unsigned long cc;
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char c = cstr[i];
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if (c != '&') continue;
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plen = i - beg;
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if (++i >= len) break;
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c = (unsigned char)cstr[i];
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#define MATCH(s) (len - i >= (int)rb_strlen_lit(s) && \
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memcmp(&cstr[i], s, rb_strlen_lit(s)) == 0 && \
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(i += rb_strlen_lit(s) - 1, 1))
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switch (c) {
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case 'a':
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++i;
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if (MATCH("pos;")) {
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c = '\'';
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}
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else if (MATCH("mp;")) {
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c = '&';
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}
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else continue;
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break;
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case 'q':
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++i;
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if (MATCH("uot;")) {
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c = '"';
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}
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else continue;
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break;
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case 'g':
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++i;
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if (MATCH("t;")) {
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c = '>';
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}
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else continue;
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break;
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case 'l':
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++i;
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if (MATCH("t;")) {
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c = '<';
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}
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else continue;
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break;
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case '#':
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if (len - ++i >= 2 && ISDIGIT(cstr[i])) {
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cc = ruby_scan_digits(&cstr[i], len-i, 10, &clen, &overflow);
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}
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else if ((cstr[i] == 'x' || cstr[i] == 'X') && len - ++i >= 2 && ISXDIGIT(cstr[i])) {
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cc = ruby_scan_digits(&cstr[i], len-i, 16, &clen, &overflow);
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}
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else continue;
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i += clen;
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if (overflow || cc >= charlimit || cstr[i] != ';') continue;
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if (!dest) {
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dest = rb_str_buf_new(len);
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}
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rb_str_cat(dest, cstr + beg, plen);
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if (charlimit > 256) {
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rb_str_cat(dest, buf, rb_enc_mbcput((OnigCodePoint)cc, buf, enc));
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}
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else {
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c = (unsigned char)cc;
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rb_str_cat(dest, &c, 1);
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}
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beg = i + 1;
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continue;
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default:
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--i;
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continue;
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}
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if (!dest) {
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dest = rb_str_buf_new(len);
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}
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rb_str_cat(dest, cstr + beg, plen);
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rb_str_cat(dest, &c, 1);
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beg = i + 1;
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}
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if (dest) {
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rb_str_cat(dest, cstr + beg, len - beg);
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preserve_original_state(str, dest);
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return dest;
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}
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else {
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return rb_str_dup(str);
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}
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}
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static unsigned char
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url_unreserved_char(unsigned char c)
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{
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switch (c) {
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case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9':
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case 'a': case 'b': case 'c': case 'd': case 'e': case 'f': case 'g': case 'h': case 'i': case 'j':
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case 'k': case 'l': case 'm': case 'n': case 'o': case 'p': case 'q': case 'r': case 's': case 't':
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case 'u': case 'v': case 'w': case 'x': case 'y': case 'z':
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case 'A': case 'B': case 'C': case 'D': case 'E': case 'F': case 'G': case 'H': case 'I': case 'J':
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case 'K': case 'L': case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R': case 'S': case 'T':
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case 'U': case 'V': case 'W': case 'X': case 'Y': case 'Z':
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case '-': case '.': case '_': case '~':
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return 1;
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default:
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break;
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}
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return 0;
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}
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static VALUE
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optimized_escape(VALUE str)
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{
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long i, len, beg = 0;
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VALUE dest = 0;
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const char *cstr;
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char buf[4] = {'%'};
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len = RSTRING_LEN(str);
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cstr = RSTRING_PTR(str);
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for (i = 0; i < len; ++i) {
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const unsigned char c = (unsigned char)cstr[i];
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if (!url_unreserved_char(c)) {
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if (!dest) {
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dest = rb_str_buf_new(len);
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}
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rb_str_cat(dest, cstr + beg, i - beg);
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beg = i + 1;
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if (c == ' ') {
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rb_str_cat_cstr(dest, "+");
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}
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else {
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buf[1] = upper_hexdigits[(c >> 4) & 0xf];
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buf[2] = upper_hexdigits[c & 0xf];
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rb_str_cat(dest, buf, 3);
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}
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}
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}
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if (dest) {
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rb_str_cat(dest, cstr + beg, len - beg);
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preserve_original_state(str, dest);
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return dest;
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}
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else {
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return rb_str_dup(str);
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}
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}
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static VALUE
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optimized_unescape(VALUE str, VALUE encoding)
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{
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long i, len, beg = 0;
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VALUE dest = 0;
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const char *cstr;
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rb_encoding *enc = rb_to_encoding(encoding);
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int cr, origenc, encidx = rb_enc_to_index(enc);
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len = RSTRING_LEN(str);
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cstr = RSTRING_PTR(str);
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for (i = 0; i < len; ++i) {
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char buf[1];
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const char c = cstr[i];
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int clen = 0;
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if (c == '%') {
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if (i + 3 > len) break;
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if (!ISXDIGIT(cstr[i+1])) continue;
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if (!ISXDIGIT(cstr[i+2])) continue;
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buf[0] = ((char_to_number(cstr[i+1]) << 4)
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| char_to_number(cstr[i+2]));
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clen = 2;
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}
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else if (c == '+') {
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buf[0] = ' ';
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}
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else {
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continue;
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}
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if (!dest) {
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dest = rb_str_buf_new(len);
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}
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rb_str_cat(dest, cstr + beg, i - beg);
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i += clen;
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beg = i + 1;
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rb_str_cat(dest, buf, 1);
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}
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if (dest) {
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rb_str_cat(dest, cstr + beg, len - beg);
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preserve_original_state(str, dest);
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cr = ENC_CODERANGE_UNKNOWN;
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}
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else {
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dest = rb_str_dup(str);
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cr = ENC_CODERANGE(str);
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}
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origenc = rb_enc_get_index(str);
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if (origenc != encidx) {
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rb_enc_associate_index(dest, encidx);
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if (!ENC_CODERANGE_CLEAN_P(rb_enc_str_coderange(dest))) {
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rb_enc_associate_index(dest, origenc);
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if (cr != ENC_CODERANGE_UNKNOWN)
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ENC_CODERANGE_SET(dest, cr);
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}
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}
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return dest;
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}
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/*
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* call-seq:
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* CGI.escapeHTML(string) -> string
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*
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* Returns HTML-escaped string.
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*
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*/
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static VALUE
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cgiesc_escape_html(VALUE self, VALUE str)
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{
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StringValue(str);
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if (rb_enc_str_asciicompat_p(str)) {
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return optimized_escape_html(str);
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}
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else {
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return rb_call_super(1, &str);
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}
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}
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/*
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* call-seq:
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* CGI.unescapeHTML(string) -> string
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*
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* Returns HTML-unescaped string.
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*
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*/
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static VALUE
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cgiesc_unescape_html(VALUE self, VALUE str)
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{
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StringValue(str);
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if (rb_enc_str_asciicompat_p(str)) {
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return optimized_unescape_html(str);
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}
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else {
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return rb_call_super(1, &str);
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}
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}
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/*
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* call-seq:
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* CGI.escape(string) -> string
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*
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* Returns URL-escaped string.
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*
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*/
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static VALUE
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cgiesc_escape(VALUE self, VALUE str)
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{
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StringValue(str);
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if (rb_enc_str_asciicompat_p(str)) {
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return optimized_escape(str);
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}
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else {
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return rb_call_super(1, &str);
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}
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}
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static VALUE
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accept_charset(int argc, VALUE *argv, VALUE self)
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{
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if (argc > 0)
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return argv[0];
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return rb_cvar_get(CLASS_OF(self), id_accept_charset);
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}
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/*
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* call-seq:
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* CGI.unescape(string, encoding=@@accept_charset) -> string
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*
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* Returns URL-unescaped string.
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*
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*/
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static VALUE
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cgiesc_unescape(int argc, VALUE *argv, VALUE self)
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{
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VALUE str = (rb_check_arity(argc, 1, 2), argv[0]);
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StringValue(str);
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if (rb_enc_str_asciicompat_p(str)) {
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VALUE enc = accept_charset(argc-1, argv+1, self);
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return optimized_unescape(str, enc);
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}
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else {
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return rb_call_super(argc, argv);
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}
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}
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void
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Init_escape(void)
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{
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#ifdef HAVE_RB_EXT_RACTOR_SAFE
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rb_ext_ractor_safe(true);
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#endif
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id_accept_charset = rb_intern_const("@@accept_charset");
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InitVM(escape);
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}
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void
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InitVM_escape(void)
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{
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rb_cCGI = rb_define_class("CGI", rb_cObject);
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rb_mEscape = rb_define_module_under(rb_cCGI, "Escape");
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rb_mUtil = rb_define_module_under(rb_cCGI, "Util");
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rb_define_method(rb_mEscape, "escapeHTML", cgiesc_escape_html, 1);
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rb_define_method(rb_mEscape, "unescapeHTML", cgiesc_unescape_html, 1);
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rb_define_method(rb_mEscape, "escape", cgiesc_escape, 1);
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rb_define_method(rb_mEscape, "unescape", cgiesc_unescape, -1);
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rb_prepend_module(rb_mUtil, rb_mEscape);
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rb_extend_object(rb_cCGI, rb_mEscape);
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}
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