* include/ruby/encoding.h (ENC_DUMMY_P): moved dummy encoding flag to
rb_encoding from Encoding instance.
* encoding.c (rb_encoding_list): list of Encoding instances.
* encoding.c (struct rb_encoding_entry): moved base encoding from
instance variable.
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(ENCINDEX_UTF_8): renamed from ENCINDEX_UTF8.
(rb_enc_init): use ENC_REGISTER.
* include/ruby/oniguruma.h (OnigEncodingUTF8, ONIG_ENCODING_UTF8):
removed.
* enc/*.c: remove use of &encoding_*; use enc argument instead.
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ruby_encoding_index to avoid linear search in rb_enc_to_index.
* include/ruby/encoding.h (rb_enc_to_index): macro defined to use
ruby_encoding_index.
* encoding.c (rb_enc_to_index): removed.
(enc_register_at): initialize ruby_encoding_index member.
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validation.
* include/ruby/encoding.h (rb_enc_precise_mbclen): declared.
(MBCLEN_CHARFOUND): new macro.
(MBCLEN_INVALID): new macro.
(MBCLEN_NEEDMORE): new macro.
* include/ruby/oniguruma.h (OnigEncodingTypeST): replace mbc_enc_len
by precise_mbc_enc_len.
(ONIGENC_PRECISE_MBC_ENC_LEN): new macro.
(ONIGENC_CONSTRUCT_MBCLEN_CHARFOUND): new macro.
(ONIGENC_CONSTRUCT_MBCLEN_INVALID): new macro.
(ONIGENC_CONSTRUCT_MBCLEN_NEEDMORE): new macro.
(ONIGENC_MBCLEN_CHARFOUND): new macro.
(ONIGENC_MBCLEN_INVALID): new macro.
(ONIGENC_MBCLEN_NEEDMORE): new macro.
(ONIGENC_MBC_ENC_LEN): use ONIGENC_PRECISE_MBC_ENC_LEN.
* enc/euc_jp.c: validation implemented.
* enc/sjis.c: ditto.
* enc/utf8.c: ditto.
* string.c (rb_str_inspect): use rb_enc_precise_mbclen for invalid
encoding.
(rb_str_valid_encoding_p): new method String#valid_encoding?.
* io.c (rb_io_getc): use rb_enc_precise_mbclen.
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parameter to every function members.
* include/ruby/oniguruma.h (OnigEncodingTypeST): add auxiliary
data member to provide user defined data for an encoding.
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