From aa72b389be17f2b1c703ac236cc839a2f6b428a5 Mon Sep 17 00:00:00 2001 From: Kenichi Handa Date: Thu, 28 Dec 2000 01:05:02 +0000 Subject: [PATCH] (SAFE_ONE_MORE_BYTE): New macro. (DECODE_EMACS_MULE_COMPOSITION_CHAR): New macro. (DECODE_EMACS_MULE_COMPOSITION_RULE): New macro. (decode_composition_emacs_mule): New function. (decode_coding_emacs_mule): Decode composition sequence by calling decode_composition_emacs_mule. (ENCODE_COMPOSITION_EMACS_MULE): New macro. (encode_coding_emacs_mule): Changed from macro to function. If a text contains compostions, encode them correctly. (setup_coding_system): Set coding->commong_flags for emacs-mule so that decoding and encoding are required. --- src/coding.c | 475 +++++++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 439 insertions(+), 36 deletions(-) diff --git a/src/coding.c b/src/coding.c index 10be961c3aa..ade20141c57 100644 --- a/src/coding.c +++ b/src/coding.c @@ -513,9 +513,9 @@ coding_safe_chars (coding) /*** 2. Emacs internal format (emacs-mule) handlers ***/ -/* Emacs' internal format for encoding multiple character sets is a - kind of multi-byte encoding, i.e. characters are encoded by - variable-length sequences of one-byte codes. +/* Emacs' internal format for representation of multiple character + sets is a kind of multi-byte encoding, i.e. characters are + represented by variable-length sequences of one-byte codes. ASCII characters and control characters (e.g. `tab', `newline') are represented by one-byte sequences which are their ASCII codes, in @@ -531,7 +531,7 @@ coding_safe_chars (coding) The other characters are represented by a sequence of `base leading-code', optional `extended leading-code', and one or two `position-code's. The length of the sequence is determined by the - base leading-code. Leading-code takes the range 0x80 through 0x9F, + base leading-code. Leading-code takes the range 0x81 through 0x9D, whereas extended leading-code and position-code take the range 0xA0 through 0xFF. See `charset.h' for more details about leading-code and position-code. @@ -542,9 +542,46 @@ coding_safe_chars (coding) ascii 0x00..0x7F eight-bit-control LEADING_CODE_8_BIT_CONTROL + 0xA0..0xBF eight-bit-graphic 0xA0..0xBF - ELSE 0x81..0x9F + [0xA0..0xFF]+ + ELSE 0x81..0x9D + [0xA0..0xFF]+ --------------------------------------------- + As this is the internal character representation, the format is + usually not used externally (i.e. in a file or in a data sent to a + process). But, it is possible to have a text externally in this + format (i.e. by encoding by the coding system `emacs-mule'). + + In that case, a sequence of one-byte codes has a slightly different + form. + + At first, all characters in eight-bit-control are represented by + one-byte sequences which are their 8-bit code. + + Next, character composition data are represented by the byte + sequence of the form: 0x80 METHOD BYTES CHARS COMPONENT ..., + where, + METHOD is 0xF0 plus one of composition method (enum + composition_method), + + BYTES is 0x20 plus a byte length of this composition data, + + CHARS is 0x20 plus a number of characters composed by this + data, + + COMPONENTs are characters of multibye form or composition + rules encoded by two-byte of ASCII codes. + + In addition, for backward compatibility, the following formats are + also recognized as composition data on decoding. + + 0x80 MSEQ ... + 0x80 0xFF MSEQ RULE MSEQ RULE ... MSEQ + + Here, + MSEQ is a multibyte form but in these special format: + ASCII: 0xA0 ASCII_CODE+0x80, + other: LEADING_CODE+0x20 FOLLOWING-BYTE ..., + RULE is a one byte code of the range 0xA0..0xF0 that + represents a composition rule. */ enum emacs_code_class_type emacs_code_class[256]; @@ -608,6 +645,261 @@ detect_coding_emacs_mule (src, src_end, multibytep) } +/* Record the starting position START and METHOD of one composition. */ + +#define CODING_ADD_COMPOSITION_START(coding, start, method) \ + do { \ + struct composition_data *cmp_data = coding->cmp_data; \ + int *data = cmp_data->data + cmp_data->used; \ + coding->cmp_data_start = cmp_data->used; \ + data[0] = -1; \ + data[1] = cmp_data->char_offset + start; \ + data[3] = (int) method; \ + cmp_data->used += 4; \ + } while (0) + +/* Record the ending position END of the current composition. */ + +#define CODING_ADD_COMPOSITION_END(coding, end) \ + do { \ + struct composition_data *cmp_data = coding->cmp_data; \ + int *data = cmp_data->data + coding->cmp_data_start; \ + data[0] = cmp_data->used - coding->cmp_data_start; \ + data[2] = cmp_data->char_offset + end; \ + } while (0) + +/* Record one COMPONENT (alternate character or composition rule). */ + +#define CODING_ADD_COMPOSITION_COMPONENT(coding, component) \ + (coding->cmp_data->data[coding->cmp_data->used++] = component) + + +/* Get one byte from a data pointed by SRC and increment SRC. If SRC + is not less than SRC_END, return -1 without inccrementing Src. */ + +#define SAFE_ONE_MORE_BYTE() (src >= src_end ? -1 : *src++) + + +/* Decode a character represented as a component of composition + sequence of Emacs 20 style at SRC. Set C to that character, store + its multibyte form sequence at P, and set P to the end of that + sequence. If no valid character is found, set C to -1. */ + +#define DECODE_EMACS_MULE_COMPOSITION_CHAR(c, p) \ + do { \ + int bytes; \ + \ + c = SAFE_ONE_MORE_BYTE (); \ + if (c < 0) \ + break; \ + if (CHAR_HEAD_P (c)) \ + c = -1; \ + else if (c == 0xA0) \ + { \ + c = SAFE_ONE_MORE_BYTE (); \ + if (c < 0xA0) \ + c = -1; \ + else \ + { \ + c -= 0xA0; \ + *p++ = c; \ + } \ + } \ + else if (BASE_LEADING_CODE_P (c - 0x20)) \ + { \ + unsigned char *p0 = p; \ + \ + c -= 0x20; \ + *p++ = c; \ + bytes = BYTES_BY_CHAR_HEAD (c); \ + while (--bytes) \ + { \ + c = SAFE_ONE_MORE_BYTE (); \ + if (c < 0) \ + break; \ + *p++ = c; \ + } \ + if (UNIBYTE_STR_AS_MULTIBYTE_P (p0, p - p0, bytes)) \ + c = STRING_CHAR (p0, bytes); \ + else \ + c = -1; \ + } \ + else \ + c = -1; \ + } while (0) + + +/* Decode a composition rule represented as a component of composition + sequence of Emacs 20 style at SRC. Set C to the rule. If not + valid rule is found, set C to -1. */ + +#define DECODE_EMACS_MULE_COMPOSITION_RULE(c) \ + do { \ + c = SAFE_ONE_MORE_BYTE (); \ + c -= 0xA0; \ + if (c < 0 || c >= 81) \ + c = -1; \ + else \ + { \ + gref = c / 9, nref = c % 9; \ + c = COMPOSITION_ENCODE_RULE (gref, nref); \ + } \ + } while (0) + + +/* Decode composition sequence encoded by `emacs-mule' at the source + pointed by SRC. SRC_END is the end of source. Store information + of the composition in CODING->cmp_data. + + For backward compatibility, decode also a composition sequence of + Emacs 20 style. In that case, the composition sequence contains + characters that should be extracted into a buffer or string. Store + those characters at *DESTINATION in multibyte form. + + If we encounter an invalid byte sequence, return 0. + If we encounter an insufficient source or destination, or + insufficient space in CODING->cmp_data, return 1. + Otherwise, return consumed bytes in the source. + +*/ +static INLINE int +decode_composition_emacs_mule (coding, src, src_end, + destination, dst_end, dst_bytes) + struct coding_system *coding; + unsigned char *src, *src_end, **destination, *dst_end; + int dst_bytes; +{ + unsigned char *dst = *destination; + int method, data_len, nchars; + unsigned char *src_base = src++; + /* Store compoments of composition. */ + int component[COMPOSITION_DATA_MAX_BUNCH_LENGTH]; + int ncomponent; + /* Store multibyte form of characters to be composed. This is for + Emacs 20 style composition sequence. */ + unsigned char buf[MAX_COMPOSITION_COMPONENTS * MAX_MULTIBYTE_LENGTH]; + unsigned char *bufp = buf; + int c, i, gref, nref; + + if (coding->cmp_data->used + COMPOSITION_DATA_MAX_BUNCH_LENGTH + >= COMPOSITION_DATA_SIZE) + { + coding->result = CODING_FINISH_INSUFFICIENT_CMP; + return -1; + } + + ONE_MORE_BYTE (c); + if (c - 0xF0 >= COMPOSITION_RELATIVE + && c - 0xF0 <= COMPOSITION_WITH_RULE_ALTCHARS) + { + int with_rule; + + method = c - 0xF0; + with_rule = (method == COMPOSITION_WITH_RULE + || method == COMPOSITION_WITH_RULE_ALTCHARS); + ONE_MORE_BYTE (c); + data_len = c - 0xA0; + if (data_len < 4 + || src_base + data_len > src_end) + return 0; + ONE_MORE_BYTE (c); + nchars = c - 0xA0; + if (c < 1) + return 0; + for (ncomponent = 0; src < src_base + data_len; ncomponent++) + { + if (ncomponent % 2 && with_rule) + { + ONE_MORE_BYTE (gref); + gref -= 32; + ONE_MORE_BYTE (nref); + nref -= 32; + c = COMPOSITION_ENCODE_RULE (gref, nref); + } + else + { + int bytes; + if (UNIBYTE_STR_AS_MULTIBYTE_P (src, src_end - src, bytes)) + c = STRING_CHAR (src, bytes); + else + c = *src, bytes = 1; + src += bytes; + } + component[ncomponent] = c; + } + } + else + { + /* This may be an old Emacs 20 style format. See the comment at + the section 2 of this file. */ + while (src < src_end && !CHAR_HEAD_P (*src)) src++; + if (src == src_end + && !(coding->mode & CODING_MODE_LAST_BLOCK)) + goto label_end_of_loop; + + src_end = src; + src = src_base + 1; + if (c < 0xC0) + { + method = COMPOSITION_RELATIVE; + for (ncomponent = 0; ncomponent < MAX_COMPOSITION_COMPONENTS;) + { + DECODE_EMACS_MULE_COMPOSITION_CHAR (c, bufp); + if (c < 0) + break; + component[ncomponent++] = c; + } + if (ncomponent < 2) + return 0; + nchars = ncomponent; + } + else if (c == 0xFF) + { + method = COMPOSITION_WITH_RULE; + src++; + DECODE_EMACS_MULE_COMPOSITION_CHAR (c, bufp); + if (c < 0) + return 0; + component[0] = c; + for (ncomponent = 1; + ncomponent < MAX_COMPOSITION_COMPONENTS * 2 - 1;) + { + DECODE_EMACS_MULE_COMPOSITION_RULE (c); + if (c < 0) + break; + component[ncomponent++] = c; + DECODE_EMACS_MULE_COMPOSITION_CHAR (c, bufp); + if (c < 0) + break; + component[ncomponent++] = c; + } + if (ncomponent < 3) + return 0; + nchars = (ncomponent + 1) / 2; + } + else + return 0; + } + + if (buf == bufp || dst + (bufp - buf) <= (dst_bytes ? dst_end : src)) + { + CODING_ADD_COMPOSITION_START (coding, coding->produced_char, method); + for (i = 0; i < ncomponent; i++) + CODING_ADD_COMPOSITION_COMPONENT (coding, component[i]); + CODING_ADD_COMPOSITION_END (coding, coding->produced_char + nchars); + if (buf < bufp) + { + unsigned char *p = buf; + EMIT_BYTES (p, bufp); + *destination += bufp - buf; + coding->produced_char += nchars; + } + return (src - src_base); + } + label_end_of_loop: + return -1; +} + /* See the above "GENERAL NOTES on `decode_coding_XXX ()' functions". */ static void @@ -669,6 +961,23 @@ decode_coding_emacs_mule (coding, source, destination, src_bytes, dst_bytes) coding->produced_char++; continue; } + else if (*src == 0x80) + { + /* Start of composition data. */ + int consumed = decode_composition_emacs_mule (coding, src, src_end, + &dst, dst_end, + dst_bytes); + if (consumed < 0) + goto label_end_of_loop; + else if (consumed > 0) + { + src += consumed; + continue; + } + bytes = CHAR_STRING (*src, tmp); + p = tmp; + src++; + } else if (UNIBYTE_STR_AS_MULTIBYTE_P (src, src_end - src, bytes)) { p = src; @@ -693,9 +1002,123 @@ decode_coding_emacs_mule (coding, source, destination, src_bytes, dst_bytes) coding->produced = dst - destination; } -#define encode_coding_emacs_mule(coding, source, destination, src_bytes, dst_bytes) \ - encode_eol (coding, source, destination, src_bytes, dst_bytes) +/* Encode composition data stored at DATA into a special byte sequence + starting by 0x80. Update CODING->cmp_data_start and maybe + CODING->cmp_data for the next call. */ + +#define ENCODE_COMPOSITION_EMACS_MULE(coding, data) \ + do { \ + unsigned char buf[1024], *p0 = buf, *p; \ + int len = data[0]; \ + int i; \ + \ + buf[0] = 0x80; \ + buf[1] = 0xF0 + data[3]; /* METHOD */ \ + buf[3] = 0xA0 + (data[2] - data[1]); /* COMPOSED-CHARS */ \ + p = buf + 4; \ + if (data[3] == COMPOSITION_WITH_RULE \ + || data[3] == COMPOSITION_WITH_RULE_ALTCHARS) \ + { \ + p += CHAR_STRING (data[4], p); \ + for (i = 5; i < len; i += 2) \ + { \ + int gref, nref; \ + COMPOSITION_DECODE_RULE (data[i], gref, nref); \ + *p++ = 0x20 + gref; \ + *p++ = 0x20 + nref; \ + p += CHAR_STRING (data[i + 1], p); \ + } \ + } \ + else \ + { \ + for (i = 4; i < len; i++) \ + p += CHAR_STRING (data[i], p); \ + } \ + buf[2] = 0xA0 + (p - buf); /* COMPONENTS-BYTES */ \ + \ + if (dst + (p - buf) + 4 > (dst_bytes ? dst_end : src)) \ + { \ + coding->result = CODING_FINISH_INSUFFICIENT_DST; \ + goto label_end_of_loop; \ + } \ + while (p0 < p) \ + *dst++ = *p0++; \ + coding->cmp_data_start += data[0]; \ + if (coding->cmp_data_start == coding->cmp_data->used \ + && coding->cmp_data->next) \ + { \ + coding->cmp_data = coding->cmp_data->next; \ + coding->cmp_data_start = 0; \ + } \ + } while (0) + + +static void encode_eol P_ ((struct coding_system *, unsigned char *, + unsigned char *, int, int)); + +static void +encode_coding_emacs_mule (coding, source, destination, src_bytes, dst_bytes) + struct coding_system *coding; + unsigned char *source, *destination; + int src_bytes, dst_bytes; +{ + unsigned char *src = source; + unsigned char *src_end = source + src_bytes; + unsigned char *dst = destination; + unsigned char *dst_end = destination + dst_bytes; + unsigned char *src_base; + int c; + int char_offset; + int *data; + + Lisp_Object translation_table; + + translation_table = Qnil; + + /* Optimization for the case that there's no composition. */ + if (!coding->cmp_data || coding->cmp_data->used == 0) + { + encode_eol (coding, source, destination, src_bytes, dst_bytes); + return; + } + + char_offset = coding->cmp_data->char_offset; + data = coding->cmp_data->data + coding->cmp_data_start; + while (1) + { + src_base = src; + + /* If SRC starts a composition, encode the information about the + composition in advance. */ + if (coding->cmp_data_start < coding->cmp_data->used + && char_offset + coding->consumed_char == data[1]) + { + ENCODE_COMPOSITION_EMACS_MULE (coding, data); + char_offset = coding->cmp_data->char_offset; + data = coding->cmp_data->data + coding->cmp_data_start; + } + + ONE_MORE_CHAR (c); + if (c == '\n' && (coding->eol_type == CODING_EOL_CRLF + || coding->eol_type == CODING_EOL_CR)) + { + if (coding->eol_type == CODING_EOL_CRLF) + EMIT_TWO_BYTES ('\r', c); + else + EMIT_ONE_BYTE ('\r'); + } + else if (SINGLE_BYTE_CHAR_P (c)) + EMIT_ONE_BYTE (c); + else + EMIT_BYTES (src_base, src); + coding->consumed_char++; + } + label_end_of_loop: + coding->consumed = src_base - source; + coding->produced = coding->produced_char = dst - destination; + return; +} /*** 3. ISO2022 handlers ***/ @@ -1180,35 +1603,12 @@ coding_allocate_composition_data (coding, char_offset) coding->cmp_data_start = 0; } -/* Record the starting position START and METHOD of one composition. */ - -#define CODING_ADD_COMPOSITION_START(coding, start, method) \ - do { \ - struct composition_data *cmp_data = coding->cmp_data; \ - int *data = cmp_data->data + cmp_data->used; \ - coding->cmp_data_start = cmp_data->used; \ - data[0] = -1; \ - data[1] = cmp_data->char_offset + start; \ - data[3] = (int) method; \ - cmp_data->used += 4; \ - } while (0) - -/* Record the ending position END of the current composition. */ - -#define CODING_ADD_COMPOSITION_END(coding, end) \ - do { \ - struct composition_data *cmp_data = coding->cmp_data; \ - int *data = cmp_data->data + coding->cmp_data_start; \ - data[0] = cmp_data->used - coding->cmp_data_start; \ - data[2] = cmp_data->char_offset + end; \ - } while (0) - -/* Record one COMPONENT (alternate character or composition rule). */ - -#define CODING_ADD_COMPOSITION_COMPONENT(coding, component) \ - (coding->cmp_data->data[coding->cmp_data->used++] = component) - -/* Handle compositoin start sequence ESC 0, ESC 2, ESC 3, or ESC 4. */ +/* Handle composition start sequence ESC 0, ESC 2, ESC 3, or ESC 4. + ESC 0 : relative composition : ESC 0 CHAR ... ESC 1 + ESC 2 : rulebase composition : ESC 2 CHAR RULE CHAR RULE ... CHAR ESC 1 + ESC 3 : altchar composition : ESC 3 ALT ... ESC 0 CHAR ... ESC 1 + ESC 4 : alt&rule composition : ESC 4 ALT RULE .. ALT ESC 0 CHAR ... ESC 1 + */ #define DECODE_COMPOSITION_START(c1) \ do { \ @@ -3088,6 +3488,9 @@ setup_coding_system (coding_system, coding) { case 0: coding->type = coding_type_emacs_mule; + coding->common_flags + |= CODING_REQUIRE_DECODING_MASK | CODING_REQUIRE_ENCODING_MASK; + coding->composing = COMPOSITION_NO; if (!NILP (coding->post_read_conversion)) coding->common_flags |= CODING_REQUIRE_DECODING_MASK; if (!NILP (coding->pre_write_conversion)) -- 2.39.2