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iso2022_cnext.h
Package: libiconv-1.1.tar.gz [view]
Upload User: yingmei828
Upload Date: 2007-01-01
Package Size: 1646k
Code Size: 12k
Category:
SourceCode/Document
Development Platform:
Unix_Linux
- /*
- * ISO-2022-CN-EXT
- */
- /* Specification: RFC 1922 */
- #define ESC 0x1b
- #define SO 0x0e
- #define SI 0x0f
- /*
- * The state is composed of one of the following values
- */
- #define STATE_ASCII 0
- #define STATE_TWOBYTE 1
- /*
- * and one of the following values, << 8
- */
- #define STATE2_NONE 0
- #define STATE2_DESIGNATED_GB2312 1
- #define STATE2_DESIGNATED_CNS11643_1 2
- #define STATE2_DESIGNATED_ISO_IR_165 3
- /*
- * and one of the following values, << 16
- */
- #define STATE3_NONE 0
- #define STATE3_DESIGNATED_CNS11643_2 1
- /*
- * and one of the following values, << 24
- */
- #define STATE4_NONE 0
- #define STATE4_DESIGNATED_CNS11643_3 1
- #define STATE4_DESIGNATED_CNS11643_4 2
- #define STATE4_DESIGNATED_CNS11643_5 3
- #define STATE4_DESIGNATED_CNS11643_6 4
- #define STATE4_DESIGNATED_CNS11643_7 5
- #define SPLIT_STATE
- unsigned int state1 = state & 0xff, state2 = (state >> 8) & 0xff, state3 = (state >> 16) & 0xff, state4 = state >> 24
- #define COMBINE_STATE
- state = (state4 << 24) | (state3 << 16) | (state2 << 8) | state1
- static int
- iso2022_cn_ext_mbtowc (conv_t conv, wchar_t *pwc, const unsigned char *s, int n)
- {
- state_t state = conv->istate;
- SPLIT_STATE;
- int count = 0;
- unsigned char c;
- for (;;) {
- c = *s;
- if (c == ESC) {
- if (n < count+4)
- goto none;
- if (s[1] == '$') {
- if (s[2] == ')') {
- if (s[3] == 'A') {
- state2 = STATE2_DESIGNATED_GB2312;
- s += 4; count += 4;
- if (n < count+1)
- goto none;
- continue;
- }
- if (s[3] == 'G') {
- state2 = STATE2_DESIGNATED_CNS11643_1;
- s += 4; count += 4;
- if (n < count+1)
- goto none;
- continue;
- }
- if (s[3] == 'E') {
- state2 = STATE2_DESIGNATED_ISO_IR_165;
- s += 4; count += 4;
- if (n < count+1)
- goto none;
- continue;
- }
- }
- if (s[2] == '*') {
- if (s[3] == 'H') {
- state3 = STATE3_DESIGNATED_CNS11643_2;
- s += 4; count += 4;
- if (n < count+1)
- goto none;
- continue;
- }
- }
- if (s[2] == '+') {
- if (s[3] == 'I') {
- state4 = STATE4_DESIGNATED_CNS11643_3;
- s += 4; count += 4;
- if (n < count+1)
- goto none;
- continue;
- }
- if (s[3] == 'J') {
- state4 = STATE4_DESIGNATED_CNS11643_4;
- s += 4; count += 4;
- if (n < count+1)
- goto none;
- continue;
- }
- if (s[3] == 'K') {
- state4 = STATE4_DESIGNATED_CNS11643_5;
- s += 4; count += 4;
- if (n < count+1)
- goto none;
- continue;
- }
- if (s[3] == 'L') {
- state4 = STATE4_DESIGNATED_CNS11643_6;
- s += 4; count += 4;
- if (n < count+1)
- goto none;
- continue;
- }
- if (s[3] == 'M') {
- state4 = STATE4_DESIGNATED_CNS11643_7;
- s += 4; count += 4;
- if (n < count+1)
- goto none;
- continue;
- }
- }
- }
- if (s[1] == 'N') {
- switch (state3) {
- case STATE3_NONE:
- return RET_ILSEQ;
- case STATE3_DESIGNATED_CNS11643_2:
- if (s[2] < 0x80 && s[3] < 0x80) {
- int ret = cns11643_2_mbtowc(conv,pwc,s+2,2);
- if (ret == RET_ILSEQ)
- return RET_ILSEQ;
- if (ret != 2) abort();
- COMBINE_STATE;
- conv->istate = state;
- return count+4;
- } else
- return RET_ILSEQ;
- default: abort();
- }
- }
- if (s[1] == 'O') {
- switch (state4) {
- case STATE4_NONE:
- return RET_ILSEQ;
- case STATE4_DESIGNATED_CNS11643_3:
- if (s[2] < 0x80 && s[3] < 0x80) {
- int ret = cns11643_3_mbtowc(conv,pwc,s+2,2);
- if (ret == RET_ILSEQ)
- return RET_ILSEQ;
- if (ret != 2) abort();
- COMBINE_STATE;
- conv->istate = state;
- return count+4;
- } else
- return RET_ILSEQ;
- case STATE4_DESIGNATED_CNS11643_4:
- if (s[2] < 0x80 && s[3] < 0x80) {
- /* We don't have a CNS 11643-4 to Unicode table yet. */
- return RET_ILSEQ;
- } else
- return RET_ILSEQ;
- case STATE4_DESIGNATED_CNS11643_5:
- if (s[2] < 0x80 && s[3] < 0x80) {
- /* We don't have a CNS 11643-5 to Unicode table yet. */
- return RET_ILSEQ;
- } else
- return RET_ILSEQ;
- case STATE4_DESIGNATED_CNS11643_6:
- if (s[2] < 0x80 && s[3] < 0x80) {
- /* We don't have a CNS 11643-6 to Unicode table yet. */
- return RET_ILSEQ;
- } else
- return RET_ILSEQ;
- case STATE4_DESIGNATED_CNS11643_7:
- if (s[2] < 0x80 && s[3] < 0x80) {
- /* We don't have a CNS 11643-7 to Unicode table yet. */
- return RET_ILSEQ;
- } else
- return RET_ILSEQ;
- default: abort();
- }
- }
- return RET_ILSEQ;
- }
- if (c == SO) {
- if (state2 != STATE2_DESIGNATED_GB2312 && state2 != STATE2_DESIGNATED_CNS11643_1 && state2 != STATE2_DESIGNATED_ISO_IR_165)
- return RET_ILSEQ;
- state1 = STATE_TWOBYTE;
- s++; count++;
- if (n < count+1)
- goto none;
- continue;
- }
- if (c == SI) {
- state1 = STATE_ASCII;
- s++; count++;
- if (n < count+1)
- goto none;
- continue;
- }
- break;
- }
- switch (state1) {
- case STATE_ASCII:
- if (c < 0x80) {
- int ret = ascii_mbtowc(conv,pwc,s,1);
- if (ret == RET_ILSEQ)
- return RET_ILSEQ;
- if (ret != 1) abort();
- if (*pwc == 0x000a || *pwc == 0x000d) {
- state2 = STATE2_NONE; state3 = STATE3_NONE; state4 = STATE3_NONE;
- }
- COMBINE_STATE;
- conv->istate = state;
- return count+1;
- } else
- return RET_ILSEQ;
- case STATE_TWOBYTE:
- if (n < count+2)
- goto none;
- if (s[0] < 0x80 && s[1] < 0x80) {
- int ret;
- switch (state2) {
- case STATE2_NONE:
- return RET_ILSEQ;
- case STATE2_DESIGNATED_GB2312:
- ret = gb2312_mbtowc(conv,pwc,s,2); break;
- case STATE2_DESIGNATED_CNS11643_1:
- ret = cns11643_1_mbtowc(conv,pwc,s,2); break;
- case STATE2_DESIGNATED_ISO_IR_165:
- ret = isoir165_mbtowc(conv,pwc,s,2); break;
- default: abort();
- }
- if (ret == RET_ILSEQ)
- return RET_ILSEQ;
- if (ret != 2) abort();
- COMBINE_STATE;
- conv->istate = state;
- return count+2;
- } else
- return RET_ILSEQ;
- default: abort();
- }
- none:
- COMBINE_STATE;
- conv->istate = state;
- return RET_TOOFEW(count);
- }
- static int
- iso2022_cn_ext_wctomb (conv_t conv, unsigned char *r, wchar_t wc, int n)
- {
- state_t state = conv->ostate;
- SPLIT_STATE;
- unsigned char buf[3];
- int ret;
- /* Try ASCII. */
- ret = ascii_wctomb(conv,buf,wc,1);
- if (ret != RET_ILSEQ) {
- if (ret != 1) abort();
- if (buf[0] < 0x80) {
- int count = (state1 == STATE_ASCII ? 1 : 2);
- if (n < count)
- return RET_TOOSMALL;
- if (state1 != STATE_ASCII) {
- r[0] = SI;
- r += 1;
- state1 = STATE_ASCII;
- }
- r[0] = buf[0];
- if (wc == 0x000a || wc == 0x000d) {
- state2 = STATE2_NONE; state3 = STATE3_NONE; state4 = STATE3_NONE;
- }
- COMBINE_STATE;
- conv->ostate = state;
- return count;
- }
- }
- /* Try GB 2312-1980. */
- ret = gb2312_wctomb(conv,buf,wc,2);
- if (ret != RET_ILSEQ) {
- if (ret != 2) abort();
- if (buf[0] < 0x80 && buf[1] < 0x80) {
- int count = (state2 == STATE2_DESIGNATED_GB2312 ? 0 : 4) + (state1 == STATE_TWOBYTE ? 0 : 1) + 2;
- if (n < count)
- return RET_TOOSMALL;
- if (state2 != STATE2_DESIGNATED_GB2312) {
- r[0] = ESC;
- r[1] = '$';
- r[2] = ')';
- r[3] = 'A';
- r += 4;
- state2 = STATE2_DESIGNATED_GB2312;
- }
- if (state1 != STATE_TWOBYTE) {
- r[0] = SO;
- r += 1;
- state1 = STATE_TWOBYTE;
- }
- r[0] = buf[0];
- r[1] = buf[1];
- COMBINE_STATE;
- conv->ostate = state;
- return count;
- }
- }
- ret = cns11643_wctomb(conv,buf,wc,3);
- if (ret != RET_ILSEQ) {
- if (ret != 3) abort();
- /* Try CNS 11643-1992 Plane 1. */
- if (buf[0] == 0 && buf[1] < 0x80 && buf[2] < 0x80) {
- int count = (state2 == STATE2_DESIGNATED_CNS11643_1 ? 0 : 4) + (state1 == STATE_TWOBYTE ? 0 : 1) + 2;
- if (n < count)
- return RET_TOOSMALL;
- if (state2 != STATE2_DESIGNATED_CNS11643_1) {
- r[0] = ESC;
- r[1] = '$';
- r[2] = ')';
- r[3] = 'G';
- r += 4;
- state2 = STATE2_DESIGNATED_CNS11643_1;
- }
- if (state1 != STATE_TWOBYTE) {
- r[0] = SO;
- r += 1;
- state1 = STATE_TWOBYTE;
- }
- r[0] = buf[1];
- r[1] = buf[2];
- COMBINE_STATE;
- conv->ostate = state;
- return count;
- }
- /* Try CNS 11643-1992 Plane 2. */
- if (buf[0] == 1 && buf[1] < 0x80 && buf[2] < 0x80) {
- int count = (state3 == STATE3_DESIGNATED_CNS11643_2 ? 0 : 4) + 4;
- if (n < count)
- return RET_TOOSMALL;
- if (state3 != STATE3_DESIGNATED_CNS11643_2) {
- r[0] = ESC;
- r[1] = '$';
- r[2] = '*';
- r[3] = 'H';
- r += 4;
- state3 = STATE3_DESIGNATED_CNS11643_2;
- }
- r[0] = ESC;
- r[1] = 'N';
- r[2] = buf[1];
- r[3] = buf[2];
- COMBINE_STATE;
- conv->ostate = state;
- return count;
- }
- /* Try CNS 11643-1992 Plane 3. */
- if (buf[0] == 2 && buf[1] < 0x80 && buf[2] < 0x80) {
- int count = (state4 == STATE4_DESIGNATED_CNS11643_3 ? 0 : 4) + 4;
- if (n < count)
- return RET_TOOSMALL;
- if (state4 != STATE4_DESIGNATED_CNS11643_3) {
- r[0] = ESC;
- r[1] = '$';
- r[2] = '+';
- r[3] = 'I';
- r += 4;
- state4 = STATE4_DESIGNATED_CNS11643_3;
- }
- r[0] = ESC;
- r[1] = 'O';
- r[2] = buf[1];
- r[3] = buf[2];
- COMBINE_STATE;
- conv->ostate = state;
- return count;
- }
- /* No table for CNS 11643-1992 Plane 4 yet. */
- /* No table for CNS 11643-1992 Plane 5 yet. */
- /* No table for CNS 11643-1992 Plane 6 yet. */
- /* No table for CNS 11643-1992 Plane 7 yet. */
- }
- /* Try ISO-IR-165. */
- ret = isoir165_wctomb(conv,buf,wc,2);
- if (ret != RET_ILSEQ) {
- if (ret != 2) abort();
- if (buf[0] < 0x80 && buf[1] < 0x80) {
- int count = (state2 == STATE2_DESIGNATED_ISO_IR_165 ? 0 : 4) + (state1 == STATE_TWOBYTE ? 0 : 1) + 2;
- if (n < count)
- return RET_TOOSMALL;
- if (state2 != STATE2_DESIGNATED_ISO_IR_165) {
- r[0] = ESC;
- r[1] = '$';
- r[2] = ')';
- r[3] = 'E';
- r += 4;
- state2 = STATE2_DESIGNATED_ISO_IR_165;
- }
- if (state1 != STATE_TWOBYTE) {
- r[0] = SO;
- r += 1;
- state1 = STATE_TWOBYTE;
- }
- r[0] = buf[0];
- r[1] = buf[1];
- COMBINE_STATE;
- conv->ostate = state;
- return count;
- }
- }
- return RET_ILSEQ;
- }
- static int
- iso2022_cn_ext_reset (conv_t conv, unsigned char *r, int n)
- {
- state_t state = conv->ostate;
- SPLIT_STATE;
- (void)state2;
- (void)state3;
- (void)state4;
- if (state1 != STATE_ASCII) {
- if (n < 1)
- return RET_TOOSMALL;
- r[0] = SI;
- /* conv->ostate = 0; will be done by the caller */
- return 1;
- } else
- return 0;
- }
- #undef COMBINE_STATE
- #undef SPLIT_STATE
- #undef STATE4_DESIGNATED_CNS11643_7
- #undef STATE4_DESIGNATED_CNS11643_6
- #undef STATE4_DESIGNATED_CNS11643_5
- #undef STATE4_DESIGNATED_CNS11643_4
- #undef STATE4_DESIGNATED_CNS11643_3
- #undef STATE4_NONE
- #undef STATE3_DESIGNATED_CNS11643_2
- #undef STATE3_NONE
- #undef STATE2_DESIGNATED_ISO_IR_165
- #undef STATE2_DESIGNATED_CNS11643_1
- #undef STATE2_DESIGNATED_GB2312
- #undef STATE2_NONE
- #undef STATE_TWOBYTE
- #undef STATE_ASCII