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FFmpeg/libavcodec/faxcompr.c
Luca Barbato a3b2b83f01 faxcompr: return meaningful errors 
And optionally forward them to the caller instead of concealing them.

Unify err and ret in a single variable.
2013-06-07 17:23:53 +02:00

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/*
* CCITT Fax Group 3 and 4 decompression
* Copyright (c) 2008 Konstantin Shishkov
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; 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;
runend--; // for the last written 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
run_off += *ref++;
run = run_off - offs;
offs = run_off;
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 (run_off <= offs) {
run_off += *ref++;
run_off += *ref++;
}
}
*runs++ = saved_run;
*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;
runs = av_malloc(runsize * sizeof(runs[0]));
ref = av_malloc(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);
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 &&
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;
}
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