| /* |
| * Copyright (C) 1999-2001, 2008, 2016 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 Lesser General Public |
| * License as published by the Free Software Foundation; either version 2.1 |
| * 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 |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with the GNU LIBICONV Library; see the file COPYING.LIB. |
| * If not, see <https://www.gnu.org/licenses/>. |
| */ |
| |
| /* |
| * ISO-2022-CN |
| */ |
| |
| /* 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 |
| /* |
| * and one of the following values, << 16 |
| */ |
| #define STATE3_NONE 0 |
| #define STATE3_DESIGNATED_CNS11643_2 1 |
| |
| #define SPLIT_STATE \ |
| unsigned int state1 = state & 0xff, state2 = (state >> 8) & 0xff, state3 = state >> 16 |
| #define COMBINE_STATE \ |
| state = (state3 << 16) | (state2 << 8) | state1 |
| |
| static int |
| iso2022_cn_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t 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[2] == '*') { |
| if (s[3] == 'H') { |
| state3 = STATE3_DESIGNATED_CNS11643_2; |
| s += 4; count += 4; |
| if (n < count+1) |
| goto none; |
| continue; |
| } |
| } |
| } |
| if (s[1] == 'N') { |
| switch (state3) { |
| case STATE3_NONE: |
| goto 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) |
| goto ilseq; |
| if (ret != 2) abort(); |
| COMBINE_STATE; |
| conv->istate = state; |
| return count+4; |
| } else |
| goto ilseq; |
| default: abort(); |
| } |
| } |
| goto ilseq; |
| } |
| if (c == SO) { |
| if (state2 != STATE2_DESIGNATED_GB2312 && state2 != STATE2_DESIGNATED_CNS11643_1) |
| goto 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) |
| goto ilseq; |
| if (ret != 1) abort(); |
| if (*pwc == 0x000a || *pwc == 0x000d) { |
| state2 = STATE2_NONE; state3 = STATE3_NONE; |
| } |
| COMBINE_STATE; |
| conv->istate = state; |
| return count+1; |
| } else |
| goto ilseq; |
| case STATE_TWOBYTE: |
| if (n < count+2) |
| goto none; |
| if (s[0] < 0x80 && s[1] < 0x80) { |
| int ret; |
| switch (state2) { |
| case STATE2_NONE: |
| goto 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; |
| default: abort(); |
| } |
| if (ret == RET_ILSEQ) |
| goto ilseq; |
| if (ret != 2) abort(); |
| COMBINE_STATE; |
| conv->istate = state; |
| return count+2; |
| } else |
| goto ilseq; |
| default: abort(); |
| } |
| |
| none: |
| COMBINE_STATE; |
| conv->istate = state; |
| return RET_TOOFEW(count); |
| |
| ilseq: |
| COMBINE_STATE; |
| conv->istate = state; |
| return RET_SHIFT_ILSEQ(count); |
| } |
| |
| static int |
| iso2022_cn_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t 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; |
| } |
| 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; |
| } |
| } |
| |
| return RET_ILUNI; |
| } |
| |
| static int |
| iso2022_cn_reset (conv_t conv, unsigned char *r, size_t n) |
| { |
| state_t state = conv->ostate; |
| SPLIT_STATE; |
| (void)state2; |
| (void)state3; |
| 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 STATE3_DESIGNATED_CNS11643_2 |
| #undef STATE3_NONE |
| #undef STATE2_DESIGNATED_CNS11643_1 |
| #undef STATE2_DESIGNATED_GB2312 |
| #undef STATE2_NONE |
| #undef STATE_TWOBYTE |
| #undef STATE_ASCII |
