/* * Copyright (C) 1999-2001 Free Software Foundation, Inc. * This file is part of the GNU LIBICONV Library. * * The GNU LIBICONV Library is free software; you can redistribute it * and/or modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * The GNU LIBICONV Library is distributed in the hope that it will be * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with the GNU LIBICONV Library; see the file COPYING.LIB. * If not, write to the Free Software Foundation, Inc., 51 Franklin Street, * Fifth Floor, Boston, MA 02110-1301, USA. */ /* * 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, ucs4_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) { int ret = cns11643_4_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_5: if (s[2] < 0x80 && s[3] < 0x80) { int ret = cns11643_5_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_6: if (s[2] < 0x80 && s[3] < 0x80) { int ret = cns11643_6_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_7: if (s[2] < 0x80 && s[3] < 0x80) { int ret = cns11643_7_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(); } } 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, ucs4_t wc, int n) { state_t state = conv->ostate; SPLIT_STATE; unsigned char buf[3]; int ret; /* There is no need to handle Unicode 3.1 tag characters and to look for "zh-CN" or "zh-TW" tags, because GB2312 and CNS11643 are disjoint. */ /* Try ASCII. */ ret = ascii_wctomb(conv,buf,wc,1); if (ret != RET_ILUNI) { 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_ILUNI) { 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_ILUNI) { if (ret != 3) abort(); /* Try CNS 11643-1992 Plane 1. */ if (buf[0] == 1 && 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] = '$'; r[2] = ')'; r[3] = 'G'; r += 4; state2 = STATE2_DESIGNATED_CNS11643_1; } if (state1 != STATE_TWOBYTE) { r[0] = SO; r += 1; state1 = STATE_TWOBYTE; } r[0] = buf[1]; r[1] = buf[2]; COMBINE_STATE; conv->ostate = state; return count; } /* Try CNS 11643-1992 Plane 2. */ if (buf[0] == 2 && buf[1] < 0x80 && buf[2] < 0x80) { int count = (state3 == STATE3_DESIGNATED_CNS11643_2 ? 0 : 4) + 4; if (n < count) return RET_TOOSMALL; if (state3 != STATE3_DESIGNATED_CNS11643_2) { r[0] = ESC; r[1] = '$'; 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] == 3 && 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] = '$'; r[2] = '+'; r[3] = 'I'; r += 4; state4 = STATE4_DESIGNATED_CNS11643_3; } r[0] = ESC; r[1] = 'O'; r[2] = buf[1]; r[3] = buf[2]; COMBINE_STATE; conv->ostate = state; return count; } /* Try CNS 11643-1992 Plane 4. */ if (buf[0] == 4 && buf[1] < 0x80 && buf[2] < 0x80) { int count = (state4 == STATE4_DESIGNATED_CNS11643_4 ? 0 : 4) + 4; if (n < count) return RET_TOOSMALL; if (state4 != STATE4_DESIGNATED_CNS11643_4) { r[0] = ESC; r[1] = '$'; r[2] = '+'; r[3] = 'J'; r += 4; state4 = STATE4_DESIGNATED_CNS11643_4; } r[0] = ESC; r[1] = 'O'; r[2] = buf[1]; r[3] = buf[2]; COMBINE_STATE; conv->ostate = state; return count; } /* Try CNS 11643-1992 Plane 5. */ if (buf[0] == 5 && buf[1] < 0x80 && buf[2] < 0x80) { int count = (state4 == STATE4_DESIGNATED_CNS11643_5 ? 0 : 4) + 4; if (n < count) return RET_TOOSMALL; if (state4 != STATE4_DESIGNATED_CNS11643_5) { r[0] = ESC; r[1] = '$'; r[2] = '+'; r[3] = 'K'; r += 4; state4 = STATE4_DESIGNATED_CNS11643_5; } r[0] = ESC; r[1] = 'O'; r[2] = buf[1]; r[3] = buf[2]; COMBINE_STATE; conv->ostate = state; return count; } /* Try CNS 11643-1992 Plane 6. */ if (buf[0] == 6 && buf[1] < 0x80 && buf[2] < 0x80) { int count = (state4 == STATE4_DESIGNATED_CNS11643_6 ? 0 : 4) + 4; if (n < count) return RET_TOOSMALL; if (state4 != STATE4_DESIGNATED_CNS11643_6) { r[0] = ESC; r[1] = '$'; r[2] = '+'; r[3] = 'L'; r += 4; state4 = STATE4_DESIGNATED_CNS11643_6; } r[0] = ESC; r[1] = 'O'; r[2] = buf[1]; r[3] = buf[2]; COMBINE_STATE; conv->ostate = state; return count; } /* Try CNS 11643-1992 Plane 7. */ if (buf[0] == 7 && buf[1] < 0x80 && buf[2] < 0x80) { int count = (state4 == STATE4_DESIGNATED_CNS11643_7 ? 0 : 4) + 4; if (n < count) return RET_TOOSMALL; if (state4 != STATE4_DESIGNATED_CNS11643_7) { r[0] = ESC; r[1] = '$'; r[2] = '+'; r[3] = 'M'; r += 4; state4 = STATE4_DESIGNATED_CNS11643_7; } r[0] = ESC; r[1] = 'O'; r[2] = buf[1]; r[3] = buf[2]; COMBINE_STATE; conv->ostate = state; return count; } } /* Try ISO-IR-165. */ ret = isoir165_wctomb(conv,buf,wc,2); if (ret != RET_ILUNI) { if (ret != 2) abort(); if (buf[0] < 0x80 && buf[1] < 0x80) { int count = (state2 == STATE2_DESIGNATED_ISO_IR_165 ? 0 : 4) + (state1 == STATE_TWOBYTE ? 0 : 1) + 2; if (n < count) return RET_TOOSMALL; if (state2 != STATE2_DESIGNATED_ISO_IR_165) { r[0] = ESC; r[1] = '$'; 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_ILUNI; } 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