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.
(coding_category_name): Include "coding-category-ccl".
(detect_coding_ccl): New function.
(setup_coding_system): Setup coding->spec.ccl.valid_codes from the
coding system priority `valid-codes' for CCL based coding systesm.
(detect_coding_mask): Check also a CCL based coding system.
(Fupdate_coding_systems_internal): Renamed from
Fupdate_iso_coding_systems.
(syms_of_coding): Change property char-table-extra-slot of
translation-table to 1. Initialize and static pro Qvalid_codes.
line endings. Always update dst_bytes to number of bytes actually copied.
(decode_eol): Fix value of coding->produced when decoding Unix
line endings (in case this function is ever used for that).
(detect_coding_mask): Skip ASCII codes at the head according to
ascii_skip_code.
(coding_priorities): New variable.
(Fset_coding_priority_internal): New function.
(detect_coding): Call set_coding_mask with coding_priorities as
arg CODING.
(init_coding_once): Initialize ascii_skip_code.
(syms_of_coding): Declare set-coding-priority-internal as a Lisp
function.
translate/translation respectively throughtout the file.
(encode_coding_iso2022): Fix bug in encoding a text ending by a
composite character.
(check_composing_code): If we are decoding the last block of data,
return 0 even if the source doesn't end by an escape sequence
which terminates the current composing sequence.
(decode_coding_iso2022): Decode correctly even if the source
doesn't end by an escape sequence which terminates the current
composing sequence.
if preceded by CR, since that confuses eol decoding.
(code_convert_region): When conversion fails with
CODING_FINISH_INSUFFICIENT_SRC, was overwriting src with garbage
from dst instead of copying from src to dst.
