assure setting inhibit_pre_post_conversion back to zero. Take
care of the multibyteness of the working buffer.
(inhibit_pre_post_conversion): New variable.
(setup_coding_system): If inhibit_pre_post_conversion is nonzero,
ignore post-read-conversion and pre-write-conversion property of
the coding system.
(code_convert_region_unwind): New function.
(code_convert_region): Set inhibit_pre_post_conversion to 1 while
running pre-write-conversion and post-read-conversion.
(code_convert_string): Likewise.
(decode_eol): Set produced/consumed values to zero if
src_bytes is <= 0 on entry.
[handa]
(setup_raw_text_coding_system): Call
setup_coding_system to initialize the fields of struct
coding_system correctly.
final_char is invalid.
(decode_coding): If coding->type is coding_type_ccl, call
ccl_coding_driver even if SRC_BYTES is zero.
(code_convert_region): Update `inserted' correctly after calling
coding->post_read_conversion. Even after the code converter
consumed all source text, call it once more if it is
coding_type_ccl to flush out data.
coding->spec.ccl.valid_codes for CCL based coding system.
(code_convert_region): Set point to FROM before inserting the
result of pre-write-funciton. Preserve original point.
(code_convert_string): If coding->type is coding_type_ccl, do
conversion even if the length of conversion region is zero.
alwasy returns 0 or -1.
(decode_coding_iso2022): Adjusted for the above change.
(encode_coding_iso2022): When encoding the last block, flush out
tailing garbage bytes.
(setup_coding_system): Delete unnecessary code.
(shrink_decoding_region): Check translation table. If ASCII
should be translated, give up shrinking.
(shrink_encoding_region): Likewise.
(SHRINK_CONVERSION_REGION_THRESHHOLD): New macro.
(SHRINK_CONVERSION_REGION): New macro.
(code_convert_region): Call SHRINK_CONVERSION_REGION. Delete text
properties here.
(code_convert_region): In the case of encoding, always calulate
correct character number.
(code_convert_string): Call SHRINK_CONVERSION_REGION.
(code_convert_region1): Don't delete text properties here.
(check_composing_code): Fix previous change. Now it
alwasy returns 0 or -1.
(decode_coding_iso2022): Adjusted for the above change.
(encode_coding_iso2022): When encoding the last block, flush out
tailing garbage bytes.
(setup_coding_system): Delete unnecessary code.
(shrink_decoding_region): Check translation table. If ASCII
should be translated, give up shrinking.
(shrink_encoding_region): Likewise.
(SHRINK_CONVERSION_REGION_THRESHHOLD): New macro.
(SHRINK_CONVERSION_REGION): New macro.
(code_convert_region): Call SHRINK_CONVERSION_REGION. Delete text
properties here.
(code_convert_region): In the case of encoding, always calulate
correct character number.
(code_convert_string): Call SHRINK_CONVERSION_REGION.
(code_convert_region1): Don't delete text properties here.
sequence doesn't end properly, return -1.
(DECODE_CHARACTER_ASCII): Update coding->composed_chars.
(DECODE_CHARACTER_DIMENSION1): Likewise.
(decode_coding_iso2022): Check validity of a composing sequence.
(code_convert_string): If the length of text to be converted is
shrunk to zero, don't perform code conversion.
(shrink_decoding_region): Fix previous change.
user or the CCL program executed an invalid command, return
CODING_FINISH_INTERRUPT.
(code_convert_region): Pay attention to the converters return
value CODING_FINISH_NORMAL and CODING_FINISH_INTERRUPT.
