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Diffstat (limited to 'nx-X11/lib/X11/lcCT.c')
| -rw-r--r-- | nx-X11/lib/X11/lcCT.c | 1303 |
1 files changed, 1303 insertions, 0 deletions
diff --git a/nx-X11/lib/X11/lcCT.c b/nx-X11/lib/X11/lcCT.c new file mode 100644 index 000000000..63608a3cd --- /dev/null +++ b/nx-X11/lib/X11/lcCT.c @@ -0,0 +1,1303 @@ +/* $Xorg: lcCT.c,v 1.4 2000/08/17 19:45:16 cpqbld Exp $ */ +/* + * Copyright 1992, 1993 by TOSHIBA Corp. + * + * Permission to use, copy, modify, and distribute this software and its + * documentation for any purpose and without fee is hereby granted, provided + * that the above copyright notice appear in all copies and that both that + * copyright notice and this permission notice appear in supporting + * documentation, and that the name of TOSHIBA not be used in advertising + * or publicity pertaining to distribution of the software without specific, + * written prior permission. TOSHIBA make no representations about the + * suitability of this software for any purpose. It is provided "as is" + * without express or implied warranty. + * + * TOSHIBA DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING + * ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL + * TOSHIBA BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR + * ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, + * WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, + * ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS + * SOFTWARE. + * + * Author: Katsuhisa Yano TOSHIBA Corp. + * mopi@osa.ilab.toshiba.co.jp + */ +/* + * Copyright 1995 by FUJITSU LIMITED + * This is source code modified by FUJITSU LIMITED under the Joint + * Development Agreement for the CDE/Motif PST. + * + * Modifier: Takanori Tateno FUJITSU LIMITED + * + */ +/* + * 2000 + * Modifier: Ivan Pascal The XFree86 Project + * Modifier: Bruno Haible The XFree86 Project + */ +/* $XFree86: xc/lib/X11/lcCT.c,v 3.26 2001/10/28 03:32:34 tsi Exp $ */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif +#include "Xlibint.h" +#include "XlcPubI.h" +#include <X11/Xos.h> +#include <stdio.h> + + +/* ====================== Built-in Character Sets ====================== */ + +/* + * Static representation of a character set that can be used in Compound Text. + */ +typedef struct _CTDataRec { + const char *name; + const char *ct_sequence; /* Compound Text encoding, ESC sequence */ +} CTDataRec, *CTData; + +static CTDataRec default_ct_data[] = +{ + /* */ + /* X11 registry name MIME name ISO-IR ESC sequence */ + /* */ + + /* Registered character sets with one byte per character */ + { "ISO8859-1:GL", /* US-ASCII 6 */ "\033(B" }, + { "ISO8859-1:GR", /* ISO-8859-1 100 */ "\033-A" }, + { "ISO8859-2:GR", /* ISO-8859-2 101 */ "\033-B" }, + { "ISO8859-3:GR", /* ISO-8859-3 109 */ "\033-C" }, + { "ISO8859-4:GR", /* ISO-8859-4 110 */ "\033-D" }, + { "ISO8859-5:GR", /* ISO-8859-5 144 */ "\033-L" }, + { "ISO8859-6:GR", /* ISO-8859-6 127 */ "\033-G" }, + { "ISO8859-7:GR", /* ISO-8859-7 126 */ "\033-F" }, + { "ISO8859-8:GR", /* ISO-8859-8 138 */ "\033-H" }, + { "ISO8859-9:GR", /* ISO-8859-9 148 */ "\033-M" }, + { "ISO8859-10:GR", /* ISO-8859-10 157 */ "\033-V" }, + { "ISO8859-11:GR", /* ISO-8859-11 166 */ "\033-T" }, + { "ISO8859-13:GR", /* ISO-8859-13 179 */ "\033-Y" }, + { "ISO8859-14:GR", /* ISO-8859-14 199 */ "\033-_" }, + { "ISO8859-15:GR", /* ISO-8859-15 203 */ "\033-b" }, + { "ISO8859-16:GR", /* ISO-8859-16 226 */ "\033-f" }, + { "JISX0201.1976-0:GL", /* ISO-646-JP 14 */ "\033(J" }, + { "JISX0201.1976-0:GR", "\033)I" }, +#if 0 + { "TIS620-0:GR", /* TIS-620 166 */ "\033-T" }, +#endif + + /* Registered character sets with two byte per character */ + { "GB2312.1980-0:GL", /* GB_2312-80 58 */ "\033$(A" }, + { "GB2312.1980-0:GR", /* GB_2312-80 58 */ "\033$)A" }, + { "JISX0208.1983-0:GL", /* JIS_X0208-1983 87 */ "\033$(B" }, + { "JISX0208.1983-0:GR", /* JIS_X0208-1983 87 */ "\033$)B" }, + { "JISX0208.1990-0:GL", /* JIS_X0208-1990 168 */ "\033$(B" }, + { "JISX0208.1990-0:GR", /* JIS_X0208-1990 168 */ "\033$)B" }, + { "JISX0212.1990-0:GL", /* JIS_X0212-1990 159 */ "\033$(D" }, + { "JISX0212.1990-0:GR", /* JIS_X0212-1990 159 */ "\033$)D" }, + { "KSC5601.1987-0:GL", /* KS_C_5601-1987 149 */ "\033$(C" }, + { "KSC5601.1987-0:GR", /* KS_C_5601-1987 149 */ "\033$)C" }, + { "CNS11643.1986-1:GL", /* CNS 11643-1992 pl.1 171 */ "\033$(G" }, + { "CNS11643.1986-1:GR", /* CNS 11643-1992 pl.1 171 */ "\033$)G" }, + { "CNS11643.1986-2:GL", /* CNS 11643-1992 pl.2 172 */ "\033$(H" }, + { "CNS11643.1986-2:GR", /* CNS 11643-1992 pl.2 172 */ "\033$)H" }, + { "CNS11643.1992-3:GL", /* CNS 11643-1992 pl.3 183 */ "\033$(I" }, + { "CNS11643.1992-3:GR", /* CNS 11643-1992 pl.3 183 */ "\033$)I" }, + { "CNS11643.1992-4:GL", /* CNS 11643-1992 pl.4 184 */ "\033$(J" }, + { "CNS11643.1992-4:GR", /* CNS 11643-1992 pl.4 184 */ "\033$)J" }, + { "CNS11643.1992-5:GL", /* CNS 11643-1992 pl.5 185 */ "\033$(K" }, + { "CNS11643.1992-5:GR", /* CNS 11643-1992 pl.5 185 */ "\033$)K" }, + { "CNS11643.1992-6:GL", /* CNS 11643-1992 pl.6 186 */ "\033$(L" }, + { "CNS11643.1992-6:GR", /* CNS 11643-1992 pl.6 186 */ "\033$)L" }, + { "CNS11643.1992-7:GL", /* CNS 11643-1992 pl.7 187 */ "\033$(M" }, + { "CNS11643.1992-7:GR", /* CNS 11643-1992 pl.7 187 */ "\033$)M" }, + + /* Registered encodings with a varying number of bytes per character */ + { "ISO10646-1", /* UTF-8 196 */ "\033%G" }, + + /* Encodings without ISO-IR assigned escape sequence must be + defined in XLC_LOCALE files, using "\033%/1" or "\033%/2". */ + + /* Backward compatibility with XFree86 3.x */ +#if 1 + { "ISO8859-14:GR", "\033%/1" }, + { "ISO8859-15:GR", "\033%/1" }, +#endif + /* For use by utf8 -> ctext */ + { "BIG5-0:GLGR", "\033%/2"}, + /* used by Emacs, but not backed by ISO-IR */ + { "BIG5-E0:GL", "\033$(0" }, + { "BIG5-E0:GR", "\033$)0" }, + { "BIG5-E1:GL", "\033$(1" }, + { "BIG5-E1:GR", "\033$)1" }, + +}; + +/* We represent UTF-8 as an XlcGLGR charset, not in extended segments. */ +#define UTF8_IN_EXTSEQ 0 + +/* ======================= Parsing ESC Sequences ======================= */ + +#define XctC0 0x0000 +#define XctHT 0x0009 +#define XctNL 0x000a +#define XctESC 0x001b +#define XctGL 0x0020 +#define XctC1 0x0080 +#define XctCSI 0x009b +#define XctGR 0x00a0 +#define XctSTX 0x0002 + +#define XctCntrlFunc 0x0023 +#define XctMB 0x0024 +#define XctOtherCoding 0x0025 +#define XctGL94 0x0028 +#define XctGR94 0x0029 +#define XctGR96 0x002d +#define XctNonStandard 0x002f +#define XctIgnoreExt 0x0030 +#define XctNotIgnoreExt 0x0031 +#define XctLeftToRight 0x0031 +#define XctRightToLeft 0x0032 +#define XctDirection 0x005d +#define XctDirectionEnd 0x005d + +#define XctGL94MB 0x2428 +#define XctGR94MB 0x2429 +#define XctExtSeg 0x252f +#define XctReturn 0x2540 + +/* + * Parses the header of a Compound Text segment, i.e. the charset designator. + * The string starts at *text and has *length bytes. + * Return value is one of: + * 0 (no valid charset designator), + * XctGL94, XctGR94, XctGR96, XctGL94MB, XctGR94MB, + * XctLeftToRight, XctRightToLeft, XctDirectionEnd, + * XctExtSeg, XctOtherCoding, XctReturn, XctIgnoreExt, XctNotIgnoreExt. + * If the return value is not 0, *text is incremented and *length decremented, + * to point past the charset designator. If the return value is one of + * XctGL94, XctGR94, XctGR96, XctGL94MB, XctGR94MB, + * XctExtSeg, XctOtherCoding, XctIgnoreExt, XctNotIgnoreExt, + * *final_byte is set to the "final byte" of the charset designator. + */ +static unsigned int +_XlcParseCT( + const char **text, + int *length, + unsigned char *final_byte) +{ + unsigned int ret = 0; + unsigned char ch; + const unsigned char *str = (const unsigned char *) *text; + + *final_byte = 0; + + if (*length < 1) + return 0; + switch (ch = *str++) { + case XctESC: + if (*length < 2) + return 0; + switch (ch = *str++) { + case XctOtherCoding: /* % */ + if (*length < 3) + return 0; + ch = *str++; + if (ch == XctNonStandard) { /* / */ + if (*length < 4) + return 0; + ret = XctExtSeg; + ch = *str++; + } else if (ch == '@') { + ret = XctReturn; + } else { + ret = XctOtherCoding; + } + *final_byte = ch; + break; + + case XctCntrlFunc: /* # */ + if (*length < 4) + return 0; + *final_byte = *str++; + switch (*str++) { + case XctIgnoreExt: /* 0 */ + ret = XctIgnoreExt; + break; + case XctNotIgnoreExt: /* 1 */ + ret = XctNotIgnoreExt; + break; + default: + ret = 0; + break; + } + break; + + case XctMB: /* $ */ + if (*length < 4) + return 0; + ch = *str++; + switch (ch) { + case XctGL94: /* ( */ + ret = XctGL94MB; + break; + case XctGR94: /* ) */ + ret = XctGR94MB; + break; + default: + ret = 0; + break; + } + *final_byte = *str++; + break; + + case XctGL94: /* ( */ + if (*length < 3) + return 0; + ret = XctGL94; + *final_byte = *str++; + break; + case XctGR94: /* ) */ + if (*length < 3) + return 0; + ret = XctGR94; + *final_byte = *str++; + break; + case XctGR96: /* - */ + if (*length < 3) + return 0; + ret = XctGR96; + *final_byte = *str++; + break; + } + break; + case XctCSI: + /* direction */ + if (*length < 2) + return 0; + switch (*str++) { + case XctLeftToRight: + if (*length < 3) + return 0; + if (*str++ == XctDirection) + ret = XctLeftToRight; + break; + case XctRightToLeft: + if (*length < 3) + return 0; + if (*str++ == XctDirection) + ret = XctRightToLeft; + break; + case XctDirectionEnd: + ret = XctDirectionEnd; + break; + } + break; + } + + if (ret) { + *length -= (const char *) str - *text; + *text = (const char *) str; + } + return ret; +} + +/* + * Fills into a freshly created XlcCharSet the fields that can be inferred + * from the ESC sequence. These are side, char_size, set_size. + * Returns True if the charset can be used with Compound Text. + * + * Used by _XlcCreateDefaultCharSet. + */ +Bool +_XlcParseCharSet( + XlcCharSet charset) +{ + unsigned int type; + unsigned char final_byte; + const char *ptr = charset->ct_sequence; + int length; + int char_size; + + if (*ptr == '\0') + return False; + + length = strlen(ptr); + + type = _XlcParseCT(&ptr, &length, &final_byte); + + /* Check for validity and determine char_size. + char_size = 0 means varying number of bytes per character. */ + switch (type) { + case XctGL94: + case XctGR94: + case XctGR96: + char_size = 1; + break; + case XctGL94MB: + case XctGR94MB: + char_size = (final_byte < 0x60 ? 2 : final_byte < 0x70 ? 3 : 4); + break; + case XctExtSeg: + char_size = final_byte - '0'; + if (!(char_size >= 0 && char_size <= 4)) + return False; + break; + case XctOtherCoding: + char_size = 0; + break; + default: + return False; + } + + charset->char_size = char_size; + + /* Fill in other values. */ + switch (type) { + case XctGL94: + case XctGL94MB: + charset->side = XlcGL; + charset->set_size = 94; + break; + case XctGR94: + case XctGR94MB: + charset->side = XlcGR; + charset->set_size = 94; + break; + case XctGR96: + charset->side = XlcGR; + charset->set_size = 96; + break; + case XctExtSeg: + case XctOtherCoding: + charset->side = XlcGLGR; + charset->set_size = 0; + break; + } + return True; +} + + +/* =============== Management of the List of Character Sets =============== */ + +/* + * Representation of a character set that can be used for Compound Text, + * at run time. + * Note: This information is not contained in the XlcCharSet, because + * multiple ESC sequences may be used for the same XlcCharSet. + */ +typedef struct _CTInfoRec { + XlcCharSet charset; + const char *ct_sequence; /* Compound Text ESC sequence */ + unsigned int type; + unsigned char final_byte; + /* If type == XctExtSeg: */ + const char *ext_segment; /* extended segment name, then '\002' */ + int ext_segment_len; /* length of above, including final '\002' */ + + struct _CTInfoRec *next; +} CTInfoRec, *CTInfo; + +/* + * List of character sets that can be used for Compound Text, + * Includes all that are listed in default_ct_data, but more can be added + * at runtime through _XlcAddCT. + */ +static CTInfo ct_list = NULL; +static CTInfo ct_list_end = NULL; + +/* + * Returns a Compound Text info record for an ESC sequence. + * The first part of the ESC sequence has already been parsed into 'type' + * and 'final_byte'. The remainder starts at 'text', at least 'text_len' + * bytes (only used if type == XctExtSeg). + */ +static CTInfo +_XlcGetCTInfo( + unsigned int type, + unsigned char final_byte, + const char *text, + int text_len) +{ + CTInfo ct_info; + + for (ct_info = ct_list; ct_info; ct_info = ct_info->next) + if (ct_info->type == type + && ct_info->final_byte == final_byte + && (type != XctExtSeg + || (text_len >= ct_info->ext_segment_len + && memcmp(text, ct_info->ext_segment, + ct_info->ext_segment_len) == 0))) + return ct_info; + + return (CTInfo) NULL; +} + +/* Returns the Compound Text info for a given XlcCharSet. + Returns NULL if none is found. */ +static CTInfo +_XlcGetCTInfoFromCharSet( + XlcCharSet charset) +{ + CTInfo ct_info; + + for (ct_info = ct_list; ct_info; ct_info = ct_info->next) + if (ct_info->charset == charset) + return ct_info; + + return (CTInfo) NULL; +} + +/* Creates a new XlcCharSet, given its name (including side suffix) and + Compound Text ESC sequence (normally at most 4 bytes), and makes it + eligible for Compound Text processing. */ +XlcCharSet +_XlcAddCT( + const char *name, + const char *ct_sequence) +{ + CTInfo ct_info, existing_info; + XlcCharSet charset; + const char *ct_ptr; + int length; + unsigned int type; + unsigned char final_byte; + + charset = _XlcGetCharSet(name); + if (charset != NULL) { + /* Even if the charset already exists, it is OK to register a second + Compound Text sequence for it. */ + } else { + /* Attempt to create the charset. */ + charset = _XlcCreateDefaultCharSet(name, ct_sequence); + if (charset == NULL) + return (XlcCharSet) NULL; + _XlcAddCharSet(charset); + } + + /* Allocate a CTinfo record. */ + length = strlen(ct_sequence); + ct_info = (CTInfo) Xmalloc(sizeof(CTInfoRec) + length+1); + if (ct_info == NULL) + return charset; + + ct_info->charset = charset; + ct_info->ct_sequence = strcpy((char *) (ct_info + 1), ct_sequence); + + /* Parse the Compound Text sequence. */ + ct_ptr = ct_sequence; + type = _XlcParseCT(&ct_ptr, &length, &final_byte); + + ct_info->type = type; + ct_info->final_byte = final_byte; + + switch (type) { + case XctGL94: + case XctGR94: + case XctGR96: + case XctGL94MB: + case XctGR94MB: + case XctOtherCoding: + ct_info->ext_segment = NULL; + ct_info->ext_segment_len = 0; + break; + case XctExtSeg: { + /* By convention, the extended segment name is the encoding_name + in lowercase. */ + const char *q = charset->encoding_name; + int n = strlen(q); + char *p; + + /* Ensure ct_info->ext_segment_len <= 0x3fff - 6. */ + if (n > 0x3fff - 6 - 1) { + Xfree(ct_info); + return charset; + } + p = (char *) Xmalloc(n+1); + if (p == NULL) { + Xfree(ct_info); + return charset; + } + ct_info->ext_segment = p; + ct_info->ext_segment_len = n+1; + for ( ; n > 0; p++, q++, n--) + *p = (*q >= 'A' && *q <= 'Z' ? *q - 'A' + 'a' : *q); + *p = XctSTX; + break; + } + default: + Xfree(ct_info); + return (XlcCharSet) NULL; + } + + /* Insert it into the list, if not already present. */ + existing_info = + _XlcGetCTInfo(type, ct_info->final_byte, + ct_info->ext_segment, ct_info->ext_segment_len); + if (existing_info == NULL) { + /* Insert it at the end. If there are duplicates CTinfo entries + for the same XlcCharSet, we want the first (standard) one to + override the second (user defined) one. */ + ct_info->next = NULL; + if (ct_list_end) + ct_list_end->next = ct_info; + else + ct_list = ct_info; + ct_list_end = ct_info; + } else { + if (existing_info->charset != charset + /* We have a conflict, with one exception: JISX0208.1983-0 and + JISX0208.1990-0 are the same for all practical purposes. */ + && !(strncmp(existing_info->charset->name, "JISX0208", 8) == 0 + && strncmp(charset->name, "JISX0208", 8) == 0)) { + fprintf(stderr, + "Xlib: charsets %s and %s have the same CT sequence\n", + charset->name, existing_info->charset->name); + if (strcmp(charset->ct_sequence, ct_sequence) == 0) + charset->ct_sequence = ""; + } + Xfree(ct_info); + } + + return charset; +} + + +/* ========== Converters String <--> CharSet <--> Compound Text ========== */ + +/* + * Structure representing the parse state of a Compound Text string. + */ +typedef struct _StateRec { + XlcCharSet charset; /* The charset of the current segment */ + XlcCharSet GL_charset; /* The charset responsible for 0x00..0x7F */ + XlcCharSet GR_charset; /* The charset responsible for 0x80..0xFF */ + XlcCharSet Other_charset; /* != NULL if currently in an other segment */ + int ext_seg_left; /* > 0 if currently in an extended segment */ +} StateRec, *State; + + +/* Subroutine for parsing an ESC sequence. */ + +typedef enum { + resOK, /* Charset saved in 'state', sequence skipped */ + resNotInList, /* Charset not found, sequence skipped */ + resNotCTSeq /* EscSeq not recognized, pointers not changed */ +} CheckResult; + +static CheckResult +_XlcCheckCTSequence( + State state, + const char **ctext, + int *ctext_len) +{ + XlcCharSet charset; + CTInfo ct_info; + const char *tmp_ctext = *ctext; + int tmp_ctext_len = *ctext_len; + unsigned int type; + unsigned char final_byte; + int ext_seg_left = 0; + + /* Check for validity. */ + type = _XlcParseCT(&tmp_ctext, &tmp_ctext_len, &final_byte); + + switch (type) { + case XctGL94: + case XctGR94: + case XctGR96: + case XctGL94MB: + case XctGR94MB: + case XctOtherCoding: + *ctext = tmp_ctext; + *ctext_len = tmp_ctext_len; + break; + case XctReturn: + *ctext = tmp_ctext; + *ctext_len = tmp_ctext_len; + state->Other_charset = NULL; + return resOK; + case XctExtSeg: + if (tmp_ctext_len > 2 + && (tmp_ctext[0] & 0x80) && (tmp_ctext[0] & 0x80)) { + unsigned int msb = tmp_ctext[0] & 0x7f; + unsigned int lsb = tmp_ctext[1] & 0x7f; + ext_seg_left = (msb << 7) + lsb; + if (ext_seg_left <= tmp_ctext_len - 2) { + *ctext = tmp_ctext + 2; + *ctext_len = tmp_ctext_len - 2; + break; + } + } + return resNotCTSeq; + default: + return resNotCTSeq; + } + + ct_info = _XlcGetCTInfo(type, final_byte, *ctext, ext_seg_left); + + if (ct_info) { + charset = ct_info->charset; + state->ext_seg_left = ext_seg_left; + if (type == XctExtSeg) { + state->charset = charset; + /* Skip past the extended segment name and the separator. */ + *ctext += ct_info->ext_segment_len; + *ctext_len -= ct_info->ext_segment_len; + state->ext_seg_left -= ct_info->ext_segment_len; + } else if (type == XctOtherCoding) { + state->Other_charset = charset; + } else { + if (charset->side == XlcGL) { + state->GL_charset = charset; + } else if (charset->side == XlcGR) { + state->GR_charset = charset; + } else { + state->GL_charset = charset; + state->GR_charset = charset; + } + } + return resOK; + } else { + state->ext_seg_left = 0; + if (type == XctExtSeg) { + /* Skip the entire extended segment. */ + *ctext += ext_seg_left; + *ctext_len -= ext_seg_left; + } + return resNotInList; + } +} + +static void +init_state( + XlcConv conv) +{ + State state = (State) conv->state; + static XlcCharSet default_GL_charset = NULL; + static XlcCharSet default_GR_charset = NULL; + + if (default_GL_charset == NULL) { + default_GL_charset = _XlcGetCharSet("ISO8859-1:GL"); + default_GR_charset = _XlcGetCharSet("ISO8859-1:GR"); + } + + /* The initial state is ISO-8859-1 on both sides. */ + state->GL_charset = state->charset = default_GL_charset; + state->GR_charset = default_GR_charset; + + state->Other_charset = NULL; + + state->ext_seg_left = 0; +} + +/* from XlcNCompoundText to XlcNCharSet */ + +static int +cttocs( + XlcConv conv, + XPointer *from, + int *from_left, + XPointer *to, + int *to_left, + XPointer *args, + int num_args) +{ + State state = (State) conv->state; + XlcCharSet charset = NULL; + const char *ctptr; + char *bufptr; + int ctext_len, buf_len; + int unconv_num = 0; + + ctptr = (const char *) *from; + bufptr = (char *) *to; + ctext_len = *from_left; + buf_len = *to_left; + + while (ctext_len > 0 && buf_len > 0) { + if (state->ext_seg_left == 0) { + /* Not in the middle of an extended segment; look at next byte. */ + unsigned char ch = *ctptr; + XlcCharSet ch_charset; + + if (ch == XctESC) { + CheckResult ret = + _XlcCheckCTSequence(state, &ctptr, &ctext_len); + if (ret == resOK) + /* state has been modified. */ + continue; + if (ret == resNotInList) { + /* XXX Just continue with previous charset. */ + unconv_num++; + continue; + } + } else if (ch == XctCSI) { + /* XXX Simply ignore the XctLeftToRight, XctRightToLeft, + XctDirectionEnd sequences for the moment. */ + unsigned char dummy; + if (_XlcParseCT(&ctptr, &ctext_len, &dummy)) { + unconv_num++; + continue; + } + } + + /* Find the charset which is responsible for this byte. */ + ch_charset = (state->Other_charset != NULL ? state->Other_charset : + (ch & 0x80 ? state->GR_charset : state->GL_charset)); + + /* Set the charset of this run, or continue the current run, + or stop the current run. */ + if (charset) { + if (charset != ch_charset) + break; + } else { + state->charset = charset = ch_charset; + } + + /* We don't want to split a character into multiple pieces. */ + if (buf_len < 6) { + if (charset->char_size > 0) { + if (buf_len < charset->char_size) + break; + } else { + /* char_size == 0 is tricky. The code here is good only + for valid UTF-8 input. */ + if (charset->ct_sequence[0] == XctESC + && charset->ct_sequence[1] == XctOtherCoding + && charset->ct_sequence[2] == 'G') { + int char_size = (ch < 0xc0 ? 1 : + ch < 0xe0 ? 2 : + ch < 0xf0 ? 3 : + ch < 0xf8 ? 4 : + ch < 0xfc ? 5 : + 6); + if (buf_len < char_size) + break; + } + } + } + + *bufptr++ = *ctptr++; + ctext_len--; + buf_len--; + } else { + /* Copy as much as possible from the current extended segment + to the buffer. */ + int char_size; + + /* Set the charset of this run, or continue the current run, + or stop the current run. */ + if (charset) { + if (charset != state->charset) + break; + } else { + charset = state->charset; + } + + char_size = charset->char_size; + + if (state->ext_seg_left <= buf_len || char_size > 0) { + int n = (state->ext_seg_left <= buf_len + ? state->ext_seg_left + : (buf_len / char_size) * char_size); + memcpy(bufptr, ctptr, n); + ctptr += n; ctext_len -= n; + bufptr += n; buf_len -= n; + state->ext_seg_left -= n; + } else { +#if UTF8_IN_EXTSEQ + /* char_size == 0 is tricky. The code here is good only + for valid UTF-8 input. */ + if (strcmp(charset->name, "ISO10646-1") == 0) { + unsigned char ch = *ctptr; + int char_size = (ch < 0xc0 ? 1 : + ch < 0xe0 ? 2 : + ch < 0xf0 ? 3 : + ch < 0xf8 ? 4 : + ch < 0xfc ? 5 : + 6); + int i; + if (buf_len < char_size) + break; + /* A small loop is faster than calling memcpy. */ + for (i = char_size; i > 0; i--) + *bufptr++ = *ctptr++; + ctext_len -= char_size; + buf_len -= char_size; + state->ext_seg_left -= char_size; + } else +#endif + { + /* Here ctext_len >= state->ext_seg_left > buf_len. + We may be splitting a character into multiple pieces. + Oh well. */ + int n = buf_len; + memcpy(bufptr, ctptr, n); + ctptr += n; ctext_len -= n; + bufptr += n; buf_len -= n; + state->ext_seg_left -= n; + } + } + } + } + + /* 'charset' is the charset for the current run. In some cases, + 'state->charset' contains the charset for the next run. Therefore, + return 'charset'. + 'charset' may still be NULL only if no output was produced. */ + if (num_args > 0) + *((XlcCharSet *) args[0]) = charset; + + *from_left -= ctptr - *((const char **) from); + *from = (XPointer) ctptr; + + *to_left -= bufptr - *((char **) to); + *to = (XPointer) bufptr; + + return unconv_num; +} + +/* from XlcNCharSet to XlcNCompoundText */ + +static int +cstoct( + XlcConv conv, + XPointer *from, + int *from_left, + XPointer *to, + int *to_left, + XPointer *args, + int num_args) +{ + State state = (State) conv->state; + XlcSide side; + unsigned char min_ch = 0, max_ch = 0; + int length, unconv_num; + CTInfo ct_info; + XlcCharSet charset; + const char *csptr; + char *ctptr; + int csstr_len, ct_len; + char *ext_segment_start; + int char_size; + + /* One argument is required, of type XlcCharSet. */ + if (num_args < 1) + return -1; + + csptr = *((const char **) from); + ctptr = *((char **) to); + csstr_len = *from_left; + ct_len = *to_left; + + charset = (XlcCharSet) args[0]; + + ct_info = _XlcGetCTInfoFromCharSet(charset); + if (ct_info == NULL) + return -1; + + side = charset->side; + length = strlen(ct_info->ct_sequence); + + ext_segment_start = NULL; + + if (ct_info->type == XctOtherCoding) { + /* Output the Escape sequence for switching to the charset, and + reserve room now for the XctReturn sequence at the end. */ + if (ct_len < length + 3) + return -1; + + memcpy(ctptr, ct_info->ct_sequence, length); + ctptr += length; + ct_len -= length + 3; + } else + /* Test whether the charset is already active. */ + if (((side == XlcGR || side == XlcGLGR) + && charset != state->GR_charset) + || ((side == XlcGL || side == XlcGLGR) + && charset != state->GL_charset)) { + + /* Output the Escape sequence for switching to the charset. */ + if (ct_info->type == XctExtSeg) { + if (ct_len < length + 2 + ct_info->ext_segment_len) + return -1; + + memcpy(ctptr, ct_info->ct_sequence, length); + ctptr += length; + ct_len -= length; + + ctptr += 2; + ct_len -= 2; + ext_segment_start = ctptr; + + /* The size of an extended segment must fit in 14 bits. */ + if (ct_len > 0x3fff) + ct_len = 0x3fff; + + memcpy(ctptr, ct_info->ext_segment, ct_info->ext_segment_len); + ctptr += ct_info->ext_segment_len; + ct_len -= ct_info->ext_segment_len; + } else { + if (ct_len < length) + return -1; + + memcpy(ctptr, ct_info->ct_sequence, length); + ctptr += length; + ct_len -= length; + } + } + + /* If the charset has side GL or GR, prepare remapping the characters + to the correct side. */ + if (charset->set_size) { + min_ch = 0x20; + max_ch = 0x7f; + if (charset->set_size == 94) { + max_ch--; + if (charset->char_size > 1 || side == XlcGR) + min_ch++; + } + } + + /* Actually copy the contents. */ + unconv_num = 0; + char_size = charset->char_size; + if (char_size == 1) { + while (csstr_len > 0 && ct_len > 0) { + if (charset->set_size) { + /* The CompoundText specification says that the only + control characters allowed are 0x09, 0x0a, 0x1b, 0x9b. + Therefore here we eliminate other control characters. */ + unsigned char ch = *((unsigned char *) csptr) & 0x7f; + if (!((ch >= min_ch && ch <= max_ch) + || (side == XlcGL + && (ch == 0x00 || ch == 0x09 || ch == 0x0a)) + || ((side == XlcGL || side == XlcGR) + && (ch == 0x1b)))) { + csptr++; + csstr_len--; + unconv_num++; + continue; + } + } + + if (side == XlcGL) + *ctptr++ = *csptr++ & 0x7f; + else if (side == XlcGR) + *ctptr++ = *csptr++ | 0x80; + else + *ctptr++ = *csptr++; + csstr_len--; + ct_len--; + } + } else if (char_size > 1) { + while (csstr_len >= char_size && ct_len >= char_size) { + if (side == XlcGL) { + int i; + for (i = char_size; i > 0; i--) + *ctptr++ = *csptr++ & 0x7f; + } else if (side == XlcGR) { + int i; + for (i = char_size; i > 0; i--) + *ctptr++ = *csptr++ | 0x80; + } else { + int i; + for (i = char_size; i > 0; i--) + *ctptr++ = *csptr++; + } + csstr_len -= char_size; + ct_len -= char_size; + } + } else { + /* char_size = 0. The code here is good only for valid UTF-8 input. */ + if ((charset->ct_sequence[0] == XctESC + && charset->ct_sequence[1] == XctOtherCoding + && charset->ct_sequence[2] == 'G') +#if UTF8_IN_EXTSEQ + || strcmp(charset->name, "ISO10646-1") == 0 +#endif + ) { + while (csstr_len > 0 && ct_len > 0) { + unsigned char ch = * (unsigned char *) csptr; + int char_size = (ch < 0xc0 ? 1 : + ch < 0xe0 ? 2 : + ch < 0xf0 ? 3 : + ch < 0xf8 ? 4 : + ch < 0xfc ? 5 : + 6); + int i; + if (!(csstr_len >= char_size && ct_len >= char_size)) + break; + for (i = char_size; i > 0; i--) + *ctptr++ = *csptr++; + csstr_len -= char_size; + ct_len -= char_size; + } + } else { + while (csstr_len > 0 && ct_len > 0) { + *ctptr++ = *csptr++; + csstr_len--; + ct_len--; + } + } + } + + if (ct_info->type == XctOtherCoding) { + /* Terminate with an XctReturn sequence. */ + ctptr[0] = XctESC; + ctptr[1] = XctOtherCoding; + ctptr[2] = '@'; + ctptr += 3; + } else if (ext_segment_start != NULL) { + /* Backpatch the extended segment's length. */ + int ext_segment_length = ctptr - ext_segment_start; + *(ext_segment_start - 2) = (ext_segment_length >> 7) | 0x80; + *(ext_segment_start - 1) = (ext_segment_length & 0x7f) | 0x80; + } else { + if (side == XlcGR || side == XlcGLGR) + state->GR_charset = charset; + if (side == XlcGL || side == XlcGLGR) + state->GL_charset = charset; + } + + *from_left -= csptr - *((const char **) from); + *from = (XPointer) csptr; + + *to_left -= ctptr - *((char **) to); + *to = (XPointer) ctptr; + + return 0; +} + +/* from XlcNString to XlcNCharSet */ + +static int +strtocs( + XlcConv conv, + XPointer *from, + int *from_left, + XPointer *to, + int *to_left, + XPointer *args, + int num_args) +{ + State state = (State) conv->state; + const char *src; + char *dst; + unsigned char side; + int length; + + src = (const char *) *from; + dst = (char *) *to; + + length = min(*from_left, *to_left); + side = *((unsigned char *) src) & 0x80; + + while (side == (*((unsigned char *) src) & 0x80) && length-- > 0) + *dst++ = *src++; + + *from_left -= src - (const char *) *from; + *from = (XPointer) src; + *to_left -= dst - (char *) *to; + *to = (XPointer) dst; + + if (num_args > 0) + *((XlcCharSet *)args[0]) = (side ? state->GR_charset : state->GL_charset); + + return 0; +} + +/* from XlcNCharSet to XlcNString */ + +static int +cstostr( + XlcConv conv, + XPointer *from, + int *from_left, + XPointer *to, + int *to_left, + XPointer *args, + int num_args) +{ + State state = (State) conv->state; + const char *csptr; + char *string_ptr; + int csstr_len, str_len; + unsigned char ch; + int unconv_num = 0; + + /* This converter can only convert from ISO8859-1:GL and ISO8859-1:GR. */ + if (num_args < 1 + || !((XlcCharSet) args[0] == state->GL_charset + || (XlcCharSet) args[0] == state->GR_charset)) + return -1; + + csptr = *((const char **) from); + string_ptr = *((char **) to); + csstr_len = *from_left; + str_len = *to_left; + + while (csstr_len > 0 && str_len > 0) { + ch = *((unsigned char *) csptr++); + csstr_len--; + /* Citing ICCCM: "STRING as a type specifies the ISO Latin-1 character + set plus the control characters TAB and NEWLINE." */ + if ((ch < 0x20 && ch != 0x00 && ch != 0x09 && ch != 0x0a) + || (ch >= 0x7f && ch < 0xa0)) { + unconv_num++; + continue; + } + *((unsigned char *) string_ptr++) = ch; + str_len--; + } + + *from_left -= csptr - *((const char **) from); + *from = (XPointer) csptr; + + *to_left -= string_ptr - *((char **) to); + *to = (XPointer) string_ptr; + + return unconv_num; +} + + +static XlcConv +create_conv( + XlcConvMethods methods) +{ + XlcConv conv; + + conv = (XlcConv) Xmalloc(sizeof(XlcConvRec) + sizeof(StateRec)); + if (conv == NULL) + return (XlcConv) NULL; + + conv->state = (XPointer) &conv[1]; + + conv->methods = methods; + + init_state(conv); + + return conv; +} + +static void +close_converter( + XlcConv conv) +{ + /* conv->state is allocated together with conv, free both at once. */ + Xfree((char *) conv); +} + + +static XlcConvMethodsRec cttocs_methods = { + close_converter, + cttocs, + init_state +}; + +static XlcConv +open_cttocs( + XLCd from_lcd, + const char *from_type, + XLCd to_lcd, + const char *to_type) +{ + return create_conv(&cttocs_methods); +} + + +static XlcConvMethodsRec cstoct_methods = { + close_converter, + cstoct, + init_state +}; + +static XlcConv +open_cstoct( + XLCd from_lcd, + const char *from_type, + XLCd to_lcd, + const char *to_type) +{ + return create_conv(&cstoct_methods); +} + + +static XlcConvMethodsRec strtocs_methods = { + close_converter, + strtocs, + init_state +}; + +static XlcConv +open_strtocs( + XLCd from_lcd, + const char *from_type, + XLCd to_lcd, + const char *to_type) +{ + return create_conv(&strtocs_methods); +} + + +static XlcConvMethodsRec cstostr_methods = { + close_converter, + cstostr, + init_state +}; + +static XlcConv +open_cstostr( + XLCd from_lcd, + const char *from_type, + XLCd to_lcd, + const char *to_type) +{ + return create_conv(&cstostr_methods); +} + + +/* =========================== Initialization =========================== */ + +Bool +_XlcInitCTInfo() +{ + if (ct_list == NULL) { + CTData ct_data; + int num; + XlcCharSet charset; + + /* Initialize ct_list. */ + + num = sizeof(default_ct_data) / sizeof(CTDataRec); + for (ct_data = default_ct_data; num > 0; ct_data++, num--) { + charset = _XlcAddCT(ct_data->name, ct_data->ct_sequence); + if (charset == NULL) + continue; + if (strncmp(charset->ct_sequence, "\x1b\x25\x2f", 3) != 0) + charset->source = CSsrcStd; + else + charset->source = CSsrcXLC; + } + + /* Register CompoundText and CharSet converters. */ + + _XlcSetConverter((XLCd) NULL, XlcNCompoundText, + (XLCd) NULL, XlcNCharSet, + open_cttocs); + _XlcSetConverter((XLCd) NULL, XlcNString, + (XLCd) NULL, XlcNCharSet, + open_strtocs); + + _XlcSetConverter((XLCd) NULL, XlcNCharSet, + (XLCd) NULL, XlcNCompoundText, + open_cstoct); + _XlcSetConverter((XLCd) NULL, XlcNCharSet, + (XLCd) NULL, XlcNString, + open_cstostr); + } + + return True; +} |