[deb_ffmpeg.git] / ffmpeg / libavcodec / faxcompr.c

/*
 * CCITT Fax Group 3 and 4 decompression
 * Copyright (c) 2008 Konstantin Shishkov
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg 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.
 *
 * FFmpeg 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 FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * CCITT Fax Group 3 and 4 decompression
 * @author Konstantin Shishkov
 */
#include "avcodec.h"
#include "get_bits.h"
#include "put_bits.h"
#include "faxcompr.h"

#define CCITT_SYMS 104

static const uint16_t ccitt_syms[CCITT_SYMS] = {
    0,    1,    2,    3,    4,    5,    6,    7,    8,    9,   10,   11,   12,
   13,   14,   15,   16,   17,   18,   19,   20,   21,   22,   23,   24,   25,
   26,   27,   28,   29,   30,   31,   32,   33,   34,   35,   36,   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,   64,
  128,  192,  256,  320,  384,  448,  512,  576,  640,  704,  768,  832,  896,
  960, 1024, 1088, 1152, 1216, 1280, 1344, 1408, 1472, 1536, 1600, 1664, 1728,
 1792, 1856, 1920, 1984, 2048, 2112, 2176, 2240, 2304, 2368, 2432, 2496, 2560
};

static const uint8_t ccitt_codes_bits[2][CCITT_SYMS] =
{
  {
    0x35, 0x07, 0x07, 0x08, 0x0B, 0x0C, 0x0E, 0x0F, 0x13, 0x14, 0x07, 0x08, 0x08,
    0x03, 0x34, 0x35, 0x2A, 0x2B, 0x27, 0x0C, 0x08, 0x17, 0x03, 0x04, 0x28, 0x2B,
    0x13, 0x24, 0x18, 0x02, 0x03, 0x1A, 0x1B, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
    0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x04, 0x05, 0x0A, 0x0B, 0x52, 0x53, 0x54,
    0x55, 0x24, 0x25, 0x58, 0x59, 0x5A, 0x5B, 0x4A, 0x4B, 0x32, 0x33, 0x34, 0x1B,
    0x12, 0x17, 0x37, 0x36, 0x37, 0x64, 0x65, 0x68, 0x67, 0xCC, 0xCD, 0xD2, 0xD3,
    0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0x98, 0x99, 0x9A, 0x18, 0x9B,
    0x08, 0x0C, 0x0D, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x1C, 0x1D, 0x1E, 0x1F
  },
  {
    0x37, 0x02, 0x03, 0x02, 0x03, 0x03, 0x02, 0x03, 0x05, 0x04, 0x04, 0x05, 0x07,
    0x04, 0x07, 0x18, 0x17, 0x18, 0x08, 0x67, 0x68, 0x6C, 0x37, 0x28, 0x17, 0x18,
    0xCA, 0xCB, 0xCC, 0xCD, 0x68, 0x69, 0x6A, 0x6B, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6,
    0xD7, 0x6C, 0x6D, 0xDA, 0xDB, 0x54, 0x55, 0x56, 0x57, 0x64, 0x65, 0x52, 0x53,
    0x24, 0x37, 0x38, 0x27, 0x28, 0x58, 0x59, 0x2B, 0x2C, 0x5A, 0x66, 0x67, 0x0F,
    0xC8, 0xC9, 0x5B, 0x33, 0x34, 0x35, 0x6C, 0x6D, 0x4A, 0x4B, 0x4C, 0x4D, 0x72,
    0x73, 0x74, 0x75, 0x76, 0x77, 0x52, 0x53, 0x54, 0x55, 0x5A, 0x5B, 0x64, 0x65,
    0x08, 0x0C, 0x0D, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x1C, 0x1D, 0x1E, 0x1F
  }
};

static const uint8_t ccitt_codes_lens[2][CCITT_SYMS] =
{
  {
     8,  6,  4,  4,  4,  4,  4,  4,  5,  5,  5,  5,  6,  6,  6,  6,  6,  6,  7,  7,
     7,  7,  7,  7,  7,  7,  7,  7,  7,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,
     8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,
     8,  8,  8,  8,  5,  5,  6,  7,  8,  8,  8,  8,  8,  8,  9,  9,  9,  9,  9,  9,
     9,  9,  9,  9,  9,  9,  9,  9,  9,  6,  9, 11, 11, 11, 12, 12, 12, 12, 12, 12,
    12, 12, 12, 12
  },
  {
    10,  3,  2,  2,  3,  4,  4,  5,  6,  6,  7,  7,  7,  8,  8,  9, 10, 10, 10, 11,
    11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
    12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
    12, 12, 12, 12, 10, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13, 13, 13, 13,
    13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 11, 11, 11, 12, 12, 12, 12, 12, 12,
    12, 12, 12, 12
  }
};

static const uint8_t ccitt_group3_2d_bits[11] = {
    1, 1, 2, 2, 2, 1, 3, 3, 3, 1, 1
};

static const uint8_t ccitt_group3_2d_lens[11] = {
    4, 3, 7, 6, 3, 1, 3, 6, 7, 7, 9
};

static VLC ccitt_vlc[2], ccitt_group3_2d_vlc;

av_cold void ff_ccitt_unpack_init(void)
{
    static VLC_TYPE code_table1[528][2];
    static VLC_TYPE code_table2[648][2];
    int i;
    static int initialized = 0;

    if (initialized)
        return;
    ccitt_vlc[0].table = code_table1;
    ccitt_vlc[0].table_allocated = 528;
    ccitt_vlc[1].table = code_table2;
    ccitt_vlc[1].table_allocated = 648;
    for (i = 0; i < 2; i++) {
        ff_init_vlc_sparse(&ccitt_vlc[i], 9, CCITT_SYMS,
                           ccitt_codes_lens[i], 1, 1,
                           ccitt_codes_bits[i], 1, 1,
                           ccitt_syms, 2, 2,
                           INIT_VLC_USE_NEW_STATIC);
    }
    INIT_VLC_STATIC(&ccitt_group3_2d_vlc, 9, 11,
                    ccitt_group3_2d_lens, 1, 1,
                    ccitt_group3_2d_bits, 1, 1, 512);
    initialized = 1;
}


static int decode_group3_1d_line(AVCodecContext *avctx, GetBitContext *gb,
                                 unsigned int pix_left, int *runs,
                                 const int *runend)
{
    int mode         = 0;
    unsigned int run = 0;
    unsigned int t;
    for (;;) {
        t    = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2);
        run += t;
        if (t < 64) {
            *runs++ = run;
            if (runs >= runend) {
                av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
                return AVERROR_INVALIDDATA;
            }
            if (pix_left <= run) {
                if (pix_left == run)
                    break;
                av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
                return AVERROR_INVALIDDATA;
            }
            pix_left -= run;
            run       = 0;
            mode      = !mode;
        } else if ((int)t == -1) {
            av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");
            return AVERROR_INVALIDDATA;
        }
    }
    *runs++ = 0;
    return 0;
}

static int decode_group3_2d_line(AVCodecContext *avctx, GetBitContext *gb,
                                 unsigned int width, int *runs,
                                 const int *runend, const int *ref)
{
    int mode          = 0, saved_run = 0, t;
    int run_off       = *ref++;
    unsigned int offs = 0, run = 0;

    while (offs < width) {
        int cmode = get_vlc2(gb, ccitt_group3_2d_vlc.table, 9, 1);
        if (cmode == -1) {
            av_log(avctx, AV_LOG_ERROR, "Incorrect mode VLC\n");
            return AVERROR_INVALIDDATA;
        }
        if (!cmode) { //pass mode
            if (run_off < width)
                run_off += *ref++;
            run      = run_off - offs;
            offs     = run_off;
            if (run_off < width)
                run_off += *ref++;
            if (offs > width) {
                av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
                return AVERROR_INVALIDDATA;
            }
            saved_run += run;
        } else if (cmode == 1) { //horizontal mode
            int k;
            for (k = 0; k < 2; k++) {
                run = 0;
                for (;;) {
                    t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2);
                    if (t == -1) {
                        av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");
                        return AVERROR_INVALIDDATA;
                    }
                    run += t;
                    if (t < 64)
                        break;
                }
                *runs++ = run + saved_run;
                if (runs >= runend) {
                    av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
                    return AVERROR_INVALIDDATA;
                }
                saved_run = 0;
                offs     += run;
                if (offs > width || run > width) {
                    av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
                    return AVERROR_INVALIDDATA;
                }
                mode = !mode;
            }
        } else if (cmode == 9 || cmode == 10) {
            avpriv_report_missing_feature(avctx, "Special modes support");
            return AVERROR_PATCHWELCOME;
        } else { //vertical mode
            run      = run_off - offs + (cmode - 5);
            run_off -= *--ref;
            offs    += run;
            if (offs > width || run > width) {
                av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
                return AVERROR_INVALIDDATA;
            }
            *runs++ = run + saved_run;
            if (runs >= runend) {
                av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
                return AVERROR_INVALIDDATA;
            }
            saved_run = 0;
            mode      = !mode;
        }
        //sync line pointers
        while (offs < width && run_off <= offs) {
            run_off += *ref++;
            run_off += *ref++;
        }
    }
    *runs++ = saved_run;
    if (saved_run) {
        if (runs >= runend) {
            av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
            return -1;
        }
        *runs++ = 0;
    }
    return 0;
}

static void put_line(uint8_t *dst, int size, int width, const int *runs)
{
    PutBitContext pb;
    int run, mode = ~0, pix_left = width, run_idx = 0;

    init_put_bits(&pb, dst, size * 8);
    while (pix_left > 0) {
        run       = runs[run_idx++];
        mode      = ~mode;
        pix_left -= run;
        for (; run > 16; run -= 16)
            put_sbits(&pb, 16, mode);
        if (run)
            put_sbits(&pb, run, mode);
    }
    flush_put_bits(&pb);
}

static int find_group3_syncmarker(GetBitContext *gb, int srcsize)
{
    unsigned int state = -1;
    srcsize -= get_bits_count(gb);
    while (srcsize-- > 0) {
        state += state + get_bits1(gb);
        if ((state & 0xFFF) == 1)
            return 0;
    }
    return -1;
}

int ff_ccitt_unpack(AVCodecContext *avctx, const uint8_t *src, int srcsize,
                    uint8_t *dst, int height, int stride,
                    enum TiffCompr compr, int opts)
{
    int j;
    GetBitContext gb;
    int *runs, *ref = NULL, *runend;
    int ret;
    int runsize = avctx->width + 2;
    int has_eol;

    runs = av_malloc_array(runsize, sizeof(runs[0]));
    ref  = av_malloc_array(runsize, sizeof(ref[0]));
    if (!runs || !ref) {
        ret = AVERROR(ENOMEM);
        goto fail;
    }
    ref[0] = avctx->width;
    ref[1] = 0;
    ref[2] = 0;
    init_get_bits(&gb, src, srcsize * 8);
    has_eol = show_bits(&gb, 12) == 1 || show_bits(&gb, 16) == 1;

    for (j = 0; j < height; j++) {
        runend = runs + runsize;
        if (compr == TIFF_G4) {
            ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, runend,
                                        ref);
            if (ret < 0)
                goto fail;
        } else {
            int g3d1 = (compr == TIFF_G3) && !(opts & 1);
            if (compr != TIFF_CCITT_RLE &&
                has_eol &&
                find_group3_syncmarker(&gb, srcsize * 8) < 0)
                break;
            if (compr == TIFF_CCITT_RLE || g3d1 || get_bits1(&gb))
                ret = decode_group3_1d_line(avctx, &gb, avctx->width, runs,
                                            runend);
            else
                ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs,
                                            runend, ref);
            if (compr == TIFF_CCITT_RLE)
                align_get_bits(&gb);
        }
        if (avctx->err_recognition & AV_EF_EXPLODE && ret < 0)
            goto fail;

        if (ret < 0) {
            put_line(dst, stride, avctx->width, ref);
        } else {
            put_line(dst, stride, avctx->width, runs);
            FFSWAP(int *, runs, ref);
        }
        dst += stride;
    }
    ret = 0;
fail:
    av_free(runs);
    av_free(ref);
    return ret;
}
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* CCITT Fax Group 3 and 4 decompression
	3	* Copyright (c) 2008 Konstantin Shishkov
	4	*
	5	* This file is part of FFmpeg.
	6	*
	7	* FFmpeg is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU Lesser General Public
	9	* License as published by the Free Software Foundation; either
	10	* version 2.1 of the License, or (at your option) any later version.
	11	*
	12	* FFmpeg is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* Lesser General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU Lesser General Public
	18	* License along with FFmpeg; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	20	*/
	21
	22	/**
	23	* @file
	24	* CCITT Fax Group 3 and 4 decompression
	25	* @author Konstantin Shishkov
	26	*/
	27	#include "avcodec.h"
	28	#include "get_bits.h"
	29	#include "put_bits.h"
	30	#include "faxcompr.h"
	31
	32	#define CCITT_SYMS 104
	33
	34	static const uint16_t ccitt_syms[CCITT_SYMS] = {
	35	0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,
	36	13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,
	37	26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38,
	38	39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,
	39	52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64,
	40	128, 192, 256, 320, 384, 448, 512, 576, 640, 704, 768, 832, 896,
	41	960, 1024, 1088, 1152, 1216, 1280, 1344, 1408, 1472, 1536, 1600, 1664, 1728,
	42	1792, 1856, 1920, 1984, 2048, 2112, 2176, 2240, 2304, 2368, 2432, 2496, 2560
	43	};
	44
	45	static const uint8_t ccitt_codes_bits[2][CCITT_SYMS] =
	46	{
	47	{
	48	0x35, 0x07, 0x07, 0x08, 0x0B, 0x0C, 0x0E, 0x0F, 0x13, 0x14, 0x07, 0x08, 0x08,
	49	0x03, 0x34, 0x35, 0x2A, 0x2B, 0x27, 0x0C, 0x08, 0x17, 0x03, 0x04, 0x28, 0x2B,
	50	0x13, 0x24, 0x18, 0x02, 0x03, 0x1A, 0x1B, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
	51	0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x04, 0x05, 0x0A, 0x0B, 0x52, 0x53, 0x54,
	52	0x55, 0x24, 0x25, 0x58, 0x59, 0x5A, 0x5B, 0x4A, 0x4B, 0x32, 0x33, 0x34, 0x1B,
	53	0x12, 0x17, 0x37, 0x36, 0x37, 0x64, 0x65, 0x68, 0x67, 0xCC, 0xCD, 0xD2, 0xD3,
	54	0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0x98, 0x99, 0x9A, 0x18, 0x9B,
	55	0x08, 0x0C, 0x0D, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x1C, 0x1D, 0x1E, 0x1F
	56	},
	57	{
	58	0x37, 0x02, 0x03, 0x02, 0x03, 0x03, 0x02, 0x03, 0x05, 0x04, 0x04, 0x05, 0x07,
	59	0x04, 0x07, 0x18, 0x17, 0x18, 0x08, 0x67, 0x68, 0x6C, 0x37, 0x28, 0x17, 0x18,
	60	0xCA, 0xCB, 0xCC, 0xCD, 0x68, 0x69, 0x6A, 0x6B, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6,
	61	0xD7, 0x6C, 0x6D, 0xDA, 0xDB, 0x54, 0x55, 0x56, 0x57, 0x64, 0x65, 0x52, 0x53,
	62	0x24, 0x37, 0x38, 0x27, 0x28, 0x58, 0x59, 0x2B, 0x2C, 0x5A, 0x66, 0x67, 0x0F,
	63	0xC8, 0xC9, 0x5B, 0x33, 0x34, 0x35, 0x6C, 0x6D, 0x4A, 0x4B, 0x4C, 0x4D, 0x72,
	64	0x73, 0x74, 0x75, 0x76, 0x77, 0x52, 0x53, 0x54, 0x55, 0x5A, 0x5B, 0x64, 0x65,
65	0x08, 0x0C, 0x0D, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x1C, 0x1D, 0x1E, 0x1F
66	}
67	};
68
69	static const uint8_t ccitt_codes_lens[2][CCITT_SYMS] =
70	{
71	{
72	8, 6, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 7, 7,
73	7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
74	8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
75	8, 8, 8, 8, 5, 5, 6, 7, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9,
76	9, 9, 9, 9, 9, 9, 9, 9, 9, 6, 9, 11, 11, 11, 12, 12, 12, 12, 12, 12,
77	12, 12, 12, 12
78	},
79	{
80	10, 3, 2, 2, 3, 4, 4, 5, 6, 6, 7, 7, 7, 8, 8, 9, 10, 10, 10, 11,
81	11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
82	12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
83	12, 12, 12, 12, 10, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13, 13, 13, 13,
84	13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 11, 11, 11, 12, 12, 12, 12, 12, 12,
85	12, 12, 12, 12
86	}
87	};
88
89	static const uint8_t ccitt_group3_2d_bits[11] = {
90	1, 1, 2, 2, 2, 1, 3, 3, 3, 1, 1
91	};
92
93	static const uint8_t ccitt_group3_2d_lens[11] = {
94	4, 3, 7, 6, 3, 1, 3, 6, 7, 7, 9
95	};
96
97	static VLC ccitt_vlc[2], ccitt_group3_2d_vlc;
98
99	av_cold void ff_ccitt_unpack_init(void)
100	{
101	static VLC_TYPE code_table1[528][2];
102	static VLC_TYPE code_table2[648][2];
103	int i;
104	static int initialized = 0;
105
106	if (initialized)
107	return;
108	ccitt_vlc[0].table = code_table1;
109	ccitt_vlc[0].table_allocated = 528;
110	ccitt_vlc[1].table = code_table2;
111	ccitt_vlc[1].table_allocated = 648;
112	for (i = 0; i < 2; i++) {
113	ff_init_vlc_sparse(&ccitt_vlc[i], 9, CCITT_SYMS,
114	ccitt_codes_lens[i], 1, 1,
115	ccitt_codes_bits[i], 1, 1,
116	ccitt_syms, 2, 2,
117	INIT_VLC_USE_NEW_STATIC);
118	}
119	INIT_VLC_STATIC(&ccitt_group3_2d_vlc, 9, 11,
120	ccitt_group3_2d_lens, 1, 1,
121	ccitt_group3_2d_bits, 1, 1, 512);
122	initialized = 1;
123	}
124
125
126	static int decode_group3_1d_line(AVCodecContext avctx, GetBitContext gb,
127	unsigned int pix_left, int *runs,
128	const int *runend)
129	{
130	int mode = 0;
131	unsigned int run = 0;
132	unsigned int t;
133	for (;;) {
134	t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2);
135	run += t;
136	if (t < 64) {
137	*runs++ = run;
138	if (runs >= runend) {
139	av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
140	return AVERROR_INVALIDDATA;
141	}
142	if (pix_left <= run) {
143	if (pix_left == run)
144	break;
145	av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
146	return AVERROR_INVALIDDATA;
147	}
148	pix_left -= run;
149	run = 0;
150	mode = !mode;
151	} else if ((int)t == -1) {
152	av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");
153	return AVERROR_INVALIDDATA;
154	}
155	}
156	*runs++ = 0;
157	return 0;
158	}
159
160	static int decode_group3_2d_line(AVCodecContext avctx, GetBitContext gb,
161	unsigned int width, int *runs,
162	const int runend, const int ref)
163	{
164	int mode = 0, saved_run = 0, t;
165	int run_off = *ref++;
166	unsigned int offs = 0, run = 0;
167
168	while (offs < width) {
169	int cmode = get_vlc2(gb, ccitt_group3_2d_vlc.table, 9, 1);
170	if (cmode == -1) {
171	av_log(avctx, AV_LOG_ERROR, "Incorrect mode VLC\n");
172	return AVERROR_INVALIDDATA;
173	}
174	if (!cmode) { //pass mode
175	if (run_off < width)
176	run_off += *ref++;
177	run = run_off - offs;
178	offs = run_off;
179	if (run_off < width)
180	run_off += *ref++;
181	if (offs > width) {
182	av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
183	return AVERROR_INVALIDDATA;
184	}
185	saved_run += run;
186	} else if (cmode == 1) { //horizontal mode
187	int k;
188	for (k = 0; k < 2; k++) {
189	run = 0;
190	for (;;) {
191	t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2);
192	if (t == -1) {
193	av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");
194	return AVERROR_INVALIDDATA;
195	}
196	run += t;
197	if (t < 64)
198	break;
199	}
200	*runs++ = run + saved_run;
201	if (runs >= runend) {
202	av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
203	return AVERROR_INVALIDDATA;
204	}
205	saved_run = 0;
206	offs += run;
207	if (offs > width \|\| run > width) {
208	av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
209	return AVERROR_INVALIDDATA;
210	}
211	mode = !mode;
212	}
213	} else if (cmode == 9 \|\| cmode == 10) {
214	avpriv_report_missing_feature(avctx, "Special modes support");
215	return AVERROR_PATCHWELCOME;
216	} else { //vertical mode
217	run = run_off - offs + (cmode - 5);
218	run_off -= *--ref;
219	offs += run;
220	if (offs > width \|\| run > width) {
221	av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
222	return AVERROR_INVALIDDATA;
223	}
224	*runs++ = run + saved_run;
225	if (runs >= runend) {
226	av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
227	return AVERROR_INVALIDDATA;
228	}
229	saved_run = 0;
230	mode = !mode;
231	}
232	//sync line pointers
233	while (offs < width && run_off <= offs) {
234	run_off += *ref++;
235	run_off += *ref++;
236	}
237	}
238	*runs++ = saved_run;
239	if (saved_run) {
240	if (runs >= runend) {
241	av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
242	return -1;
243	}
244	*runs++ = 0;
245	}
246	return 0;
247	}
248
249	static void put_line(uint8_t dst, int size, int width, const int runs)
250	{
251	PutBitContext pb;
252	int run, mode = ~0, pix_left = width, run_idx = 0;
253
254	init_put_bits(&pb, dst, size * 8);
255	while (pix_left > 0) {
256	run = runs[run_idx++];
257	mode = ~mode;
258	pix_left -= run;
259	for (; run > 16; run -= 16)
260	put_sbits(&pb, 16, mode);
261	if (run)
262	put_sbits(&pb, run, mode);
263	}
264	flush_put_bits(&pb);
265	}
266
267	static int find_group3_syncmarker(GetBitContext *gb, int srcsize)
268	{
269	unsigned int state = -1;
270	srcsize -= get_bits_count(gb);
271	while (srcsize-- > 0) {
272	state += state + get_bits1(gb);
273	if ((state & 0xFFF) == 1)
274	return 0;
275	}
276	return -1;
277	}
278
279	int ff_ccitt_unpack(AVCodecContext avctx, const uint8_t src, int srcsize,
280	uint8_t *dst, int height, int stride,
281	enum TiffCompr compr, int opts)
282	{
283	int j;
284	GetBitContext gb;
285	int runs, ref = NULL, *runend;
286	int ret;
287	int runsize = avctx->width + 2;
288	int has_eol;
289
290	runs = av_malloc_array(runsize, sizeof(runs[0]));
291	ref = av_malloc_array(runsize, sizeof(ref[0]));
292	if (!runs \|\| !ref) {
293	ret = AVERROR(ENOMEM);
294	goto fail;
295	}
296	ref[0] = avctx->width;
297	ref[1] = 0;
298	ref[2] = 0;
299	init_get_bits(&gb, src, srcsize * 8);
300	has_eol = show_bits(&gb, 12) == 1 \|\| show_bits(&gb, 16) == 1;
301
302	for (j = 0; j < height; j++) {
303	runend = runs + runsize;
304	if (compr == TIFF_G4) {
305	ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, runend,
306	ref);
307	if (ret < 0)
308	goto fail;
309	} else {
310	int g3d1 = (compr == TIFF_G3) && !(opts & 1);
311	if (compr != TIFF_CCITT_RLE &&
312	has_eol &&
313	find_group3_syncmarker(&gb, srcsize * 8) < 0)
314	break;
315	if (compr == TIFF_CCITT_RLE \|\| g3d1 \|\| get_bits1(&gb))
316	ret = decode_group3_1d_line(avctx, &gb, avctx->width, runs,
317	runend);
318	else
319	ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs,
320	runend, ref);
321	if (compr == TIFF_CCITT_RLE)
322	align_get_bits(&gb);
323	}
324	if (avctx->err_recognition & AV_EF_EXPLODE && ret < 0)
325	goto fail;
326
327	if (ret < 0) {
328	put_line(dst, stride, avctx->width, ref);
329	} else {
330	put_line(dst, stride, avctx->width, runs);
331	FFSWAP(int *, runs, ref);
332	}
333	dst += stride;
334	}
335	ret = 0;
336	fail:
337	av_free(runs);
338	av_free(ref);
339	return ret;
340	}