diff options
Diffstat (limited to 'src/jbig.c')
| -rw-r--r-- | src/jbig.c | 314 |
1 files changed, 0 insertions, 314 deletions
diff --git a/src/jbig.c b/src/jbig.c deleted file mode 100644 index 5b262e6..0000000 --- a/src/jbig.c +++ /dev/null @@ -1,314 +0,0 @@ -/* - * Copyright (c) 2022, yzrh <yzrh@noema.org> - * - * SPDX-License-Identifier: Apache-2.0 - */ - -#include <stdbool.h> -#include <stdint.h> -#include <stdlib.h> -#include <string.h> - -static const uint16_t _LSZ[0x71] = { - 0x5a1d, - 0x2586, 0x1114, 0x080b, 0x03d8, 0x01da, 0x00e5, 0x006f, 0x0036, - 0x001a, 0x000d, 0x0006, 0x0003, 0x0001, 0x5a7f, 0x3f25, 0x2cf2, - 0x207c, 0x17b9, 0x1182, 0x0cef, 0x09a1, 0x072f, 0x055c, 0x0406, - 0x0303, 0x0240, 0x01b1, 0x0144, 0x00f5, 0x00b7, 0x008a, 0x0068, - 0x004e, 0x003b, 0x002c, 0x5ae1, 0x484c, 0x3a0d, 0x2ef1, 0x261f, - 0x1f33, 0x19a8, 0x1518, 0x1177, 0x0e74, 0x0bfb, 0x09f8, 0x0861, - 0x0706, 0x05cd, 0x04de, 0x040f, 0x0363, 0x02d4, 0x025c, 0x01f8, - - 0x01a4, 0x0160, 0x0125, 0x00f6, 0x00cb, 0x00ab, 0x008f, 0x5b12, - 0x4d04, 0x412c, 0x37d8, 0x2fe8, 0x293c, 0x2379, 0x1edf, 0x1aa9, - 0x174e, 0x1424, 0x119c, 0x0f6b, 0x0d51, 0x0bb6, 0x0a40, 0x5832, - 0x4d1c, 0x438e, 0x3bdd, 0x34ee, 0x2eae, 0x299a, 0x2516, 0x5570, - 0x4ca9, 0x44d9, 0x3e22, 0x3824, 0x32b4, 0x2e17, 0x56a8, 0x4f46, - 0x47e5, 0x41cf, 0x3c3d, 0x375e, 0x5231, 0x4c0f, 0x4639, 0x415e, - 0x5627, 0x50e7, 0x4b85, 0x5597, 0x504f, 0x5a10, 0x5522, 0x59eb -}; - -static const uint8_t _NLPS[0x71] = { - 1, - 14, 16, 18, 20, 23, 25, 28, 30, - 33, 35, 9, 10, 12, 15, 36, 38, - 39, 40, 42, 43, 45, 46, 48, 49, - 51, 52, 54, 56, 57, 59, 60, 62, - 63, 32, 33, 37, 64, 65, 67, 68, - 69, 70, 72, 73, 74, 75, 77, 78, - 79, 48, 50, 50, 51, 52, 53, 54, - - 55, 56, 57, 58, 59, 61, 61, 65, - 80, 81, 82, 83, 84, 86, 87, 87, - 72, 72, 74, 74, 75, 77, 77, 80, - 88, 89, 90, 91, 92, 93, 86, 88, - 95, 96, 97, 99, 99, 93, 95, 101, - 102, 103, 104, 99, 105, 106, 107, 103, - 105, 108, 109, 110, 111, 110, 112, 112 -}; - -static const uint8_t _NMPS[0x71] = { - 1, - 2, 3, 4, 5, 6, 7, 8, 9, - 10, 11, 12, 13, 13, 15, 16, 17, - 18, 19, 20, 21, 22, 23, 24, 25, - 26, 27, 28, 29, 30, 31, 32, 33, - 34, 35, 9, 37, 38, 39, 40, 41, - 42, 43, 44, 45, 46, 47, 48, 49, - 50, 51, 52, 53, 54, 55, 56, 57, - - 58, 59, 60, 61, 62, 63, 32, 65, - 66, 67, 68, 69, 70, 71, 72, 73, - 74, 75, 76, 77, 78, 79, 48, 81, - 82, 83, 84, 85, 86, 87, 71, 89, - 90, 91, 92, 93, 94, 86, 96, 97, - 98, 99, 100, 93, 102, 103, 104, 99, - 106, 107, 103, 109, 107, 111, 109, 111 -}; - -static const bool _SWTCH[0x71] = { - 1, - 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 1, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 1, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, - - 0, 0, 0, 0, 0, 0, 0, 1, - 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 1, - 0, 0, 0, 0, 0, 0, 0, 1, - 0, 0, 0, 0, 0, 0, 1, 0, - 0, 0, 0, 0, 0, 0, 0, 0, - 1, 0, 0, 0, 0, 1, 0, 1 -}; - -static uint8_t _ct; -static uint8_t _pix; - -static uint16_t _reg_a; -static uint32_t _reg_c; -static uint8_t _mps[0x1000]; -static uint8_t _st[0x1000]; - -static int _width; -static int _height; - -static int _width_padded; - -static int _ret_pos; -static unsigned char *_ret; - -static int _scd_size; -static unsigned char *_scd; - -static void -_bytein(void) -{ - if (_ret_pos < _scd_size) - _reg_c += _scd[_ret_pos++] << 8; - - _ct = 8; -} - -static void -_initdec(void) -{ - memset(_mps, 0, 0x1000); - memset(_st, 0, 0x1000); - - _reg_c = 0; - _bytein(); - _reg_c <<= 8; - _bytein(); - _reg_c <<= 8; - _bytein(); - _reg_a = 0x0000; -} - -static void -_exchange_lps(uint16_t cx) -{ - uint8_t st_cx = _st[cx]; - uint16_t lsz_st_cx = _LSZ[_st[cx]]; - - if (_reg_a < lsz_st_cx) { - _pix = _mps[cx]; - _st[cx] = _NMPS[st_cx]; - } else { - _pix = 1 - _mps[cx]; - - if (_SWTCH[st_cx]) - _mps[cx] = _pix; - - _st[cx] = _NLPS[st_cx]; - } - - _reg_c -= _reg_a << 16; - _reg_a = lsz_st_cx; -} - -static void -_exchange_mps(uint16_t cx) -{ - uint8_t st_cx = _st[cx]; - uint16_t lsz_st_cx = _LSZ[_st[cx]]; - - if (_reg_a < lsz_st_cx) { - _pix = 1 - _mps[cx]; - - if (_SWTCH[st_cx]) - _mps[cx] = _pix; - - _st[cx] = _NLPS[st_cx]; - } else { - _pix = _mps[cx]; - _st[cx] = _NMPS[st_cx]; - } -} - -static void -_renormd(void) -{ - do { - if (_ct == 0) - _bytein(); - - _reg_a <<= 1; - _reg_c <<= 1; - _ct--; - } while (_reg_a < 0x8000); - - if (_ct == 0) - _bytein(); -} - -static void -_decode(uint16_t cx) -{ - _reg_a -= _LSZ[_st[cx]]; - - if (_reg_a > _reg_c >> 16) { - if (_reg_a < 0x8000) { - _exchange_mps(cx); - _renormd(); - } else { - _pix = _mps[cx]; - } - } else { - _exchange_lps(cx); - _renormd(); - } -} - -static void -_procline(int line, char *a, char *b, char *c) -{ - /* The encoder must be erroneous */ - uint16_t cx = 0; - - if (line > 0) { - cx += (_ret[_width_padded * (_height - line)] & 0x20) << 2; - cx += _ret[_width_padded * (_height - line)] & 0x40; - cx += (_ret[_width_padded * (_height - line)] & 0x80) >> 2; - } - - if (line > 1) { - cx += (_ret[_width_padded * (_height - line + 1)] & 0x40) >> 4; - cx += (_ret[_width_padded * (_height - line + 1)] & 0x80) >> 6; - } - - for (int i = 0; i < _width; i++) { - _decode(cx); - - cx >>= 1; - - if (_pix == 1) { - _ret[_width_padded * (_height - line - 1) + i / 8] |= _pix << (7 - (i & 0x07)); - c[i] = 1; - cx |= 0x0200; - } else { - cx &= 0xfdff; - } - - if (i + 2 < _width && a[i + 2] == 1) - cx |= 0x0004; - else - cx &= 0xfffb; - - if (i + 3 < _width && b[i + 3] == 1) - cx |= 0x0080; - else - cx &= 0xff7f; - } -} - -static int -_procstripe(void) -{ - if (_height <= 0 || _width_padded <= 0) - return 1; - - int pix_size = 8 * _width_padded; - - char *buf = malloc(3 * pix_size); - - if (buf == NULL) - return 1; - - memset(buf, 0, 3 * pix_size); - - char *a = buf; - char *b = a + pix_size; - char *c = b + pix_size; - char *z; - - for (int i = 0; i < _height; i++) { - _decode(0x029c); - - if (_pix == 1) { - if (i > 0) - memcpy(_ret + _width_padded * (_height - i - 1), - _ret + _width_padded * (_height - i), - _width_padded); - - memcpy(c, b, pix_size); - } else { - /* line atypical */ - memset(c, 0, pix_size); - _procline(i, a, b, c); - } - - z = a; - a = b; - b = c; - c = z; - } - - free(buf); - - return 0; -} - -int -strdec_jbig(char **bitmap, int width, int height, - const char * restrict jbig, int jbig_size) -{ - _width = width; - _height = height; - - _width_padded = (_width + 7) / 8; - - memset(*bitmap, 0, _height * _width_padded); - - _ret_pos = 0; - _ret = (unsigned char *) *bitmap; - - _scd_size = jbig_size; - _scd = (unsigned char *) jbig; - - _initdec(); - return _procstripe(); -} |