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ffmpeg/libavcodec/tiff.c
Michael Niedermayer 17f9626b5d tiff/doubles2str: check for truncation 
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2012-09-09 14:41:18 +02:00

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/*
* Copyright (c) 2006 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
* TIFF image decoder
* @author Konstantin Shishkov
*/
#include "avcodec.h"
#include "bytestream.h"
#include "config.h"
#if CONFIG_ZLIB
#include <zlib.h>
#endif
#include "lzw.h"
#include "tiff.h"
#include "tiff_data.h"
#include "faxcompr.h"
#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/imgutils.h"
#include "libavutil/avstring.h"
typedef struct TiffContext {
AVCodecContext *avctx;
AVFrame picture;
GetByteContext gb;
int width, height;
unsigned int bpp, bppcount;
uint32_t palette[256];
int palette_is_set;
int le;
enum TiffCompr compr;
int invert;
int fax_opts;
int predictor;
int fill_order;
int strips, rps, sstype;
int sot;
int stripsizesoff, stripsize, stripoff, strippos;
LZWState *lzw;
int geotag_count;
TiffGeoTag *geotags;
} TiffContext;
static unsigned tget_short(GetByteContext *gb, int le)
{
unsigned v = le ? bytestream2_get_le16u(gb) : bytestream2_get_be16u(gb);
return v;
}
static unsigned tget_long(GetByteContext *gb, int le)
{
unsigned v = le ? bytestream2_get_le32u(gb) : bytestream2_get_be32u(gb);
return v;
}
static double tget_double(GetByteContext *gb, int le)
{
av_alias64 i = { .u64 = le ? bytestream2_get_le64u(gb) : bytestream2_get_be64u(gb)};
return i.f64;
}
static unsigned tget(GetByteContext *gb, int type, int le)
{
switch (type) {
case TIFF_BYTE : return bytestream2_get_byteu(gb);
case TIFF_SHORT: return tget_short(gb, le);
case TIFF_LONG : return tget_long(gb, le);
default : return UINT_MAX;
}
}
static void free_geotags(TiffContext *const s)
{
int i;
for (i = 0; i < s->geotag_count; i++) {
if (s->geotags[i].val)
av_freep(&s->geotags[i].val);
}
av_freep(&s->geotags);
}
#define RET_GEOKEY(TYPE, array, element)\
if (key >= TIFF_##TYPE##_KEY_ID_OFFSET &&\
key - TIFF_##TYPE##_KEY_ID_OFFSET < FF_ARRAY_ELEMS(ff_tiff_##array##_name_type_map))\
return ff_tiff_##array##_name_type_map[key - TIFF_##TYPE##_KEY_ID_OFFSET].element;
static const char *get_geokey_name(int key)
{
RET_GEOKEY(VERT, vert, name);
RET_GEOKEY(PROJ, proj, name);
RET_GEOKEY(GEOG, geog, name);
RET_GEOKEY(CONF, conf, name);
return NULL;
}
static int get_geokey_type(int key)
{
RET_GEOKEY(VERT, vert, type);
RET_GEOKEY(PROJ, proj, type);
RET_GEOKEY(GEOG, geog, type);
RET_GEOKEY(CONF, conf, type);
return AVERROR_INVALIDDATA;
}
static int cmp_id_key(const void *id, const void *k)
{
return *(const int*)id - ((const TiffGeoTagKeyName*)k)->key;
}
static const char *search_keyval(const TiffGeoTagKeyName *keys, int n, int id)
{
return ((TiffGeoTagKeyName*)bsearch(&id, keys, n, sizeof(keys[0]), cmp_id_key))->name;
}
static char *get_geokey_val(int key, int val)
{
char *ap;
if (val == TIFF_GEO_KEY_UNDEFINED)
return av_strdup("undefined");
if (val == TIFF_GEO_KEY_USER_DEFINED)
return av_strdup("User-Defined");
#define RET_GEOKEY_VAL(TYPE, array)\
if (val >= TIFF_##TYPE##_OFFSET &&\
val - TIFF_##TYPE##_OFFSET < FF_ARRAY_ELEMS(ff_tiff_##array##_codes))\
return av_strdup(ff_tiff_##array##_codes[val - TIFF_##TYPE##_OFFSET]);
switch (key) {
case TIFF_GT_MODEL_TYPE_GEOKEY:
RET_GEOKEY_VAL(GT_MODEL_TYPE, gt_model_type);
break;
case TIFF_GT_RASTER_TYPE_GEOKEY:
RET_GEOKEY_VAL(GT_RASTER_TYPE, gt_raster_type);
break;
case TIFF_GEOG_LINEAR_UNITS_GEOKEY:
case TIFF_PROJ_LINEAR_UNITS_GEOKEY:
case TIFF_VERTICAL_UNITS_GEOKEY:
RET_GEOKEY_VAL(LINEAR_UNIT, linear_unit);
break;
case TIFF_GEOG_ANGULAR_UNITS_GEOKEY:
case TIFF_GEOG_AZIMUTH_UNITS_GEOKEY:
RET_GEOKEY_VAL(ANGULAR_UNIT, angular_unit);
break;
case TIFF_GEOGRAPHIC_TYPE_GEOKEY:
RET_GEOKEY_VAL(GCS_TYPE, gcs_type);
RET_GEOKEY_VAL(GCSE_TYPE, gcse_type);
break;
case TIFF_GEOG_GEODETIC_DATUM_GEOKEY:
RET_GEOKEY_VAL(GEODETIC_DATUM, geodetic_datum);
RET_GEOKEY_VAL(GEODETIC_DATUM_E, geodetic_datum_e);
break;
case TIFF_GEOG_ELLIPSOID_GEOKEY:
RET_GEOKEY_VAL(ELLIPSOID, ellipsoid);
break;
case TIFF_GEOG_PRIME_MERIDIAN_GEOKEY:
RET_GEOKEY_VAL(PRIME_MERIDIAN, prime_meridian);
break;
case TIFF_PROJECTED_CS_TYPE_GEOKEY:
return av_strdup(search_keyval(ff_tiff_proj_cs_type_codes, FF_ARRAY_ELEMS(ff_tiff_proj_cs_type_codes), val));
break;
case TIFF_PROJECTION_GEOKEY:
return av_strdup(search_keyval(ff_tiff_projection_codes, FF_ARRAY_ELEMS(ff_tiff_projection_codes), val));
break;
case TIFF_PROJ_COORD_TRANS_GEOKEY:
RET_GEOKEY_VAL(COORD_TRANS, coord_trans);
break;
case TIFF_VERTICAL_CS_TYPE_GEOKEY:
RET_GEOKEY_VAL(VERT_CS, vert_cs);
RET_GEOKEY_VAL(ORTHO_VERT_CS, ortho_vert_cs);
break;
}
ap = av_malloc(14);
if (ap)
snprintf(ap, 14, "Unknown-%d", val);
return ap;
}
static char *doubles2str(double *dp, int count, const char *sep)
{
int i;
char *ap, *ap0;
int component_len = 15 + strlen(sep);
if (!sep) sep = ", ";
ap = av_malloc(component_len * count);
if (!ap)
return NULL;
ap0 = ap;
ap[0] = '\0';
for (i = 0; i < count; i++) {
unsigned l = snprintf(ap, component_len, "%f%s", dp[i], sep);
if(l >= component_len)
return NULL;
ap += l;
}
ap0[strlen(ap0) - strlen(sep)] = '\0';
return ap0;
}
static char *shorts2str(int16_t *sp, int count, const char *sep)
{
int i;
char *ap, *ap0;
if (!sep) sep = ", ";
ap = av_malloc((5 + strlen(sep)) * count);
if (!ap)
return NULL;
ap0 = ap;
ap[0] = '\0';
for (i = 0; i < count; i++) {
int l = snprintf(ap, 5 + strlen(sep), "%d%s", sp[i], sep);
ap += l;
}
ap0[strlen(ap0) - strlen(sep)] = '\0';
return ap0;
}
static int add_doubles_metadata(int count,
const char *name, const char *sep,
TiffContext *s)
{
char *ap;
int i;
double *dp;
if (count >= INT_MAX / sizeof(int64_t))
return AVERROR_INVALIDDATA;
if (bytestream2_get_bytes_left(&s->gb) < count * sizeof(int64_t))
return AVERROR_INVALIDDATA;
dp = av_malloc(count * sizeof(double));
if (!dp)
return AVERROR(ENOMEM);
for (i = 0; i < count; i++)
dp[i] = tget_double(&s->gb, s->le);
ap = doubles2str(dp, count, sep);
av_freep(&dp);
if (!ap)
return AVERROR(ENOMEM);
av_dict_set(&s->picture.metadata, name, ap, AV_DICT_DONT_STRDUP_VAL);
return 0;
}
static int add_shorts_metadata(int count, const char *name,
const char *sep, TiffContext *s)
{
char *ap;
int i;
int16_t *sp;
if (count >= INT_MAX / sizeof(int16_t))
return AVERROR_INVALIDDATA;
if (bytestream2_get_bytes_left(&s->gb) < count * sizeof(int16_t))
return AVERROR_INVALIDDATA;
sp = av_malloc(count * sizeof(int16_t));
if (!sp)
return AVERROR(ENOMEM);
for (i = 0; i < count; i++)
sp[i] = tget_short(&s->gb, s->le);
ap = shorts2str(sp, count, sep);
av_freep(&sp);
if (!ap)
return AVERROR(ENOMEM);
av_dict_set(&s->picture.metadata, name, ap, AV_DICT_DONT_STRDUP_VAL);
return 0;
}
static int add_string_metadata(int count, const char *name,
TiffContext *s)
{
char *value;
if (bytestream2_get_bytes_left(&s->gb) < count)
return AVERROR_INVALIDDATA;
value = av_malloc(count + 1);
if (!value)
return AVERROR(ENOMEM);
bytestream2_get_bufferu(&s->gb, value, count);
value[count] = 0;
av_dict_set(&s->picture.metadata, name, value, AV_DICT_DONT_STRDUP_VAL);
return 0;
}
static int add_metadata(int count, int type,
const char *name, const char *sep, TiffContext *s)
{
switch(type) {
case TIFF_DOUBLE: return add_doubles_metadata(count, name, sep, s);
case TIFF_SHORT : return add_shorts_metadata(count, name, sep, s);
case TIFF_STRING: return add_string_metadata(count, name, s);
default : return AVERROR_INVALIDDATA;
};
}
#if CONFIG_ZLIB
static int tiff_uncompress(uint8_t *dst, unsigned long *len, const uint8_t *src,
int size)
{
z_stream zstream = { 0 };
int zret;
zstream.next_in = src;
zstream.avail_in = size;
zstream.next_out = dst;
zstream.avail_out = *len;
zret = inflateInit(&zstream);
if (zret != Z_OK) {
av_log(NULL, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
return zret;
}
zret = inflate(&zstream, Z_SYNC_FLUSH);
inflateEnd(&zstream);
*len = zstream.total_out;
return zret == Z_STREAM_END ? Z_OK : zret;
}
#endif
static void av_always_inline horizontal_fill(unsigned int bpp, uint8_t* dst,
int usePtr, const uint8_t *src,
uint8_t c, int width, int offset)
{
switch (bpp) {
case 1:
while (--width >= 0) {
dst[(width+offset)*8+7] = (usePtr ? src[width] : c) & 0x1;
dst[(width+offset)*8+6] = (usePtr ? src[width] : c) >> 1 & 0x1;
dst[(width+offset)*8+5] = (usePtr ? src[width] : c) >> 2 & 0x1;
dst[(width+offset)*8+4] = (usePtr ? src[width] : c) >> 3 & 0x1;
dst[(width+offset)*8+3] = (usePtr ? src[width] : c) >> 4 & 0x1;
dst[(width+offset)*8+2] = (usePtr ? src[width] : c) >> 5 & 0x1;
dst[(width+offset)*8+1] = (usePtr ? src[width] : c) >> 6 & 0x1;
dst[(width+offset)*8+0] = (usePtr ? src[width] : c) >> 7;
}
break;
case 2:
while (--width >= 0) {
dst[(width+offset)*4+3] = (usePtr ? src[width] : c) & 0x3;
dst[(width+offset)*4+2] = (usePtr ? src[width] : c) >> 2 & 0x3;
dst[(width+offset)*4+1] = (usePtr ? src[width] : c) >> 4 & 0x3;
dst[(width+offset)*4+0] = (usePtr ? src[width] : c) >> 6;
}
break;
case 4:
while (--width >= 0) {
dst[(width+offset)*2+1] = (usePtr ? src[width] : c) & 0xF;
dst[(width+offset)*2+0] = (usePtr ? src[width] : c) >> 4;
}
break;
default:
if (usePtr) {
memcpy(dst + offset, src, width);
} else {
memset(dst + offset, c, width);
}
}
}
static int tiff_unpack_strip(TiffContext *s, uint8_t *dst, int stride,
const uint8_t *src, int size, int lines)
{
int c, line, pixels, code;
const uint8_t *ssrc = src;
int width = ((s->width * s->bpp) + 7) >> 3;
if (size <= 0)
return AVERROR_INVALIDDATA;
#if CONFIG_ZLIB
if (s->compr == TIFF_DEFLATE || s->compr == TIFF_ADOBE_DEFLATE) {
uint8_t *zbuf;
unsigned long outlen;
int ret;
outlen = width * lines;
zbuf = av_malloc(outlen);
if (!zbuf)
return AVERROR(ENOMEM);
ret = tiff_uncompress(zbuf, &outlen, src, size);
if (ret != Z_OK) {
av_log(s->avctx, AV_LOG_ERROR,
"Uncompressing failed (%lu of %lu) with error %d\n", outlen,
(unsigned long)width * lines, ret);
av_free(zbuf);
return -1;
}
src = zbuf;
for (line = 0; line < lines; line++) {
if(s->bpp < 8 && s->avctx->pix_fmt == PIX_FMT_PAL8){
horizontal_fill(s->bpp, dst, 1, src, 0, width, 0);
}else{
memcpy(dst, src, width);
}
dst += stride;
src += width;
}
av_free(zbuf);
return 0;
}
#endif
if (s->compr == TIFF_LZW) {
if (ff_lzw_decode_init(s->lzw, 8, src, size, FF_LZW_TIFF) < 0) {
av_log(s->avctx, AV_LOG_ERROR, "Error initializing LZW decoder\n");
return -1;
}
}
if (s->compr == TIFF_CCITT_RLE || s->compr == TIFF_G3
|| s->compr == TIFF_G4) {
int i, ret = 0;
uint8_t *src2 = av_malloc((unsigned)size +
FF_INPUT_BUFFER_PADDING_SIZE);
if (!src2) {
av_log(s->avctx, AV_LOG_ERROR,
"Error allocating temporary buffer\n");
return AVERROR(ENOMEM);
}
if (s->fax_opts & 2) {
av_log(s->avctx, AV_LOG_ERROR,
"Uncompressed fax mode is not supported (yet)\n");
av_free(src2);
return -1;
}
if (!s->fill_order) {
memcpy(src2, src, size);
} else {
for (i = 0; i < size; i++)
src2[i] = av_reverse[src[i]];
}
memset(src2 + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
switch (s->compr) {
case TIFF_CCITT_RLE:
case TIFF_G3:
case TIFF_G4:
ret = ff_ccitt_unpack(s->avctx, src2, size, dst, lines, stride,
s->compr, s->fax_opts);
break;
}
if (s->bpp < 8 && s->avctx->pix_fmt == PIX_FMT_PAL8)
for (line = 0; line < lines; line++) {
horizontal_fill(s->bpp, dst, 1, dst, 0, width, 0);
dst += stride;
}
av_free(src2);
return ret;
}
for (line = 0; line < lines; line++) {
if (src - ssrc > size) {
av_log(s->avctx, AV_LOG_ERROR, "Source data overread\n");
return -1;
}
switch (s->compr) {
case TIFF_RAW:
if (ssrc + size - src < width)
return AVERROR_INVALIDDATA;
if (!s->fill_order) {
horizontal_fill(s->bpp * (s->avctx->pix_fmt == PIX_FMT_PAL8),
dst, 1, src, 0, width, 0);
} else {
int i;
for (i = 0; i < width; i++)
dst[i] = av_reverse[src[i]];
}
src += width;
break;
case TIFF_PACKBITS:
for (pixels = 0; pixels < width;) {
if (ssrc + size - src < 2) {
av_log(s->avctx, AV_LOG_ERROR, "Read went out of bounds\n");
return AVERROR_INVALIDDATA;
}
code = (int8_t) * src++;
if (code >= 0) {
code++;
if (pixels + code > width) {
av_log(s->avctx, AV_LOG_ERROR,
"Copy went out of bounds\n");
return -1;
}
if (ssrc + size - src < code) {
av_log(s->avctx, AV_LOG_ERROR, "Read went out of bounds\n");
return AVERROR_INVALIDDATA;
}
horizontal_fill(s->bpp * (s->avctx->pix_fmt == PIX_FMT_PAL8),
dst, 1, src, 0, code, pixels);
src += code;
pixels += code;
} else if (code != -128) { // -127..-1
code = (-code) + 1;
if (pixels + code > width) {
av_log(s->avctx, AV_LOG_ERROR,
"Run went out of bounds\n");
return -1;
}
c = *src++;
horizontal_fill(s->bpp * (s->avctx->pix_fmt == PIX_FMT_PAL8),
dst, 0, NULL, c, code, pixels);
pixels += code;
}
}
break;
case TIFF_LZW:
pixels = ff_lzw_decode(s->lzw, dst, width);
if (pixels < width) {
av_log(s->avctx, AV_LOG_ERROR, "Decoded only %i bytes of %i\n",
pixels, width);
return -1;
}
if (s->bpp < 8 && s->avctx->pix_fmt == PIX_FMT_PAL8)
horizontal_fill(s->bpp, dst, 1, dst, 0, width, 0);
break;
}
dst += stride;
}
return 0;
}
static int init_image(TiffContext *s)
{
int i, ret;
uint32_t *pal;
switch (s->bpp * 10 + s->bppcount) {
case 11:
if (!s->palette_is_set) {
s->avctx->pix_fmt = PIX_FMT_MONOBLACK;
break;
}
case 21:
case 41:
case 81:
s->avctx->pix_fmt = PIX_FMT_PAL8;
break;
case 243:
s->avctx->pix_fmt = PIX_FMT_RGB24;
break;
case 161:
s->avctx->pix_fmt = s->le ? PIX_FMT_GRAY16LE : PIX_FMT_GRAY16BE;
break;
case 162:
s->avctx->pix_fmt = PIX_FMT_GRAY8A;
break;
case 324:
s->avctx->pix_fmt = PIX_FMT_RGBA;
break;
case 483:
s->avctx->pix_fmt = s->le ? PIX_FMT_RGB48LE : PIX_FMT_RGB48BE;
break;
case 644:
s->avctx->pix_fmt = s->le ? PIX_FMT_RGBA64LE : PIX_FMT_RGBA64BE;
break;
default:
av_log(s->avctx, AV_LOG_ERROR,
"This format is not supported (bpp=%d, bppcount=%d)\n",
s->bpp, s->bppcount);
return AVERROR_INVALIDDATA;
}
if (s->width != s->avctx->width || s->height != s->avctx->height) {
if ((ret = av_image_check_size(s->width, s->height, 0, s->avctx)) < 0)
return ret;
avcodec_set_dimensions(s->avctx, s->width, s->height);
}
if (s->picture.data[0])
s->avctx->release_buffer(s->avctx, &s->picture);
if ((ret = s->avctx->get_buffer(s->avctx, &s->picture)) < 0) {
av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return ret;
}
if (s->avctx->pix_fmt == PIX_FMT_PAL8) {
if (s->palette_is_set) {
memcpy(s->picture.data[1], s->palette, sizeof(s->palette));
} else {
/* make default grayscale pal */
pal = (uint32_t *) s->picture.data[1];
for (i = 0; i < 1<<s->bpp; i++)
pal[i] = 0xFF << 24 | i * 255 / ((1<<s->bpp) - 1) * 0x010101;
}
}
return 0;
}
static int tiff_decode_tag(TiffContext *s)
{
unsigned tag, type, count, off, value = 0;
int i, j, k, pos, start;
int ret;
uint32_t *pal;
double *dp;
tag = tget_short(&s->gb, s->le);
type = tget_short(&s->gb, s->le);
count = tget_long(&s->gb, s->le);
off = tget_long(&s->gb, s->le);
start = bytestream2_tell(&s->gb);
if (type == 0 || type >= FF_ARRAY_ELEMS(type_sizes)) {
av_log(s->avctx, AV_LOG_DEBUG, "Unknown tiff type (%u) encountered\n",
type);
return 0;
}
if (count == 1) {
switch (type) {
case TIFF_BYTE:
case TIFF_SHORT:
bytestream2_seek(&s->gb, -4, SEEK_CUR);
value = tget(&s->gb, type, s->le);
break;
case TIFF_LONG:
value = off;
break;
case TIFF_STRING:
if (count <= 4) {
bytestream2_seek(&s->gb, -4, SEEK_CUR);
break;
}
default:
value = UINT_MAX;
bytestream2_seek(&s->gb, off, SEEK_SET);
}
} else {
if (count <= 4 && type_sizes[type] * count <= 4) {
bytestream2_seek(&s->gb, -4, SEEK_CUR);
} else {
bytestream2_seek(&s->gb, off, SEEK_SET);
}
}
switch (tag) {
case TIFF_WIDTH:
s->width = value;
break;
case TIFF_HEIGHT:
s->height = value;
break;
case TIFF_BPP:
s->bppcount = count;
if (count > 4) {
av_log(s->avctx, AV_LOG_ERROR,
"This format is not supported (bpp=%d, %d components)\n",
s->bpp, count);
return -1;
}
if (count == 1)
s->bpp = value;
else {
switch (type) {
case TIFF_BYTE:
s->bpp = (off & 0xFF) + ((off >> 8) & 0xFF) +
((off >> 16) & 0xFF) + ((off >> 24) & 0xFF);
break;
case TIFF_SHORT:
case TIFF_LONG:
s->bpp = 0;
if (bytestream2_get_bytes_left(&s->gb) < type_sizes[type] * count)
return -1;
for (i = 0; i < count; i++)
s->bpp += tget(&s->gb, type, s->le);
break;
default:
s->bpp = -1;
}
}
break;
case TIFF_SAMPLES_PER_PIXEL:
if (count != 1) {
av_log(s->avctx, AV_LOG_ERROR,
"Samples per pixel requires a single value, many provided\n");
return AVERROR_INVALIDDATA;
}
if (s->bppcount == 1)
s->bpp *= value;
s->bppcount = value;
break;
case TIFF_COMPR:
s->compr = value;
s->predictor = 0;
switch (s->compr) {
case TIFF_RAW:
case TIFF_PACKBITS:
case TIFF_LZW:
case TIFF_CCITT_RLE:
break;
case TIFF_G3:
case TIFF_G4:
s->fax_opts = 0;
break;
case TIFF_DEFLATE:
case TIFF_ADOBE_DEFLATE:
#if CONFIG_ZLIB
break;
#else
av_log(s->avctx, AV_LOG_ERROR, "Deflate: ZLib not compiled in\n");
return -1;
#endif
case TIFF_JPEG:
case TIFF_NEWJPEG:
av_log(s->avctx, AV_LOG_ERROR,
"JPEG compression is not supported\n");
return -1;
default:
av_log(s->avctx, AV_LOG_ERROR, "Unknown compression method %i\n",
s->compr);
return -1;
}
break;
case TIFF_ROWSPERSTRIP:
if (type == TIFF_LONG && value == UINT_MAX)
value = s->avctx->height;
if (value < 1) {
av_log(s->avctx, AV_LOG_ERROR,
"Incorrect value of rows per strip\n");
return -1;
}
s->rps = value;
break;
case TIFF_STRIP_OFFS:
if (count == 1) {
s->strippos = 0;
s->stripoff = value;
} else
s->strippos = off;
s->strips = count;
if (s->strips == 1)
s->rps = s->height;
s->sot = type;
if (s->strippos > bytestream2_size(&s->gb)) {
av_log(s->avctx, AV_LOG_ERROR,
"Tag referencing position outside the image\n");
return -1;
}
break;
case TIFF_STRIP_SIZE:
if (count == 1) {
s->stripsizesoff = 0;
s->stripsize = value;
s->strips = 1;
} else {
s->stripsizesoff = off;
}
s->strips = count;
s->sstype = type;
if (s->stripsizesoff > bytestream2_size(&s->gb)) {
av_log(s->avctx, AV_LOG_ERROR,
"Tag referencing position outside the image\n");
return -1;
}
break;
case TIFF_TILE_BYTE_COUNTS:
case TIFF_TILE_LENGTH:
case TIFF_TILE_OFFSETS:
case TIFF_TILE_WIDTH:
av_log(s->avctx, AV_LOG_ERROR, "Tiled images are not supported\n");
return AVERROR_PATCHWELCOME;
break;
case TIFF_PREDICTOR:
s->predictor = value;
break;
case TIFF_INVERT:
switch (value) {
case 0:
s->invert = 1;
break;
case 1:
s->invert = 0;
break;
case 2:
case 3:
break;
default:
av_log(s->avctx, AV_LOG_ERROR, "Color mode %d is not supported\n",
value);
return -1;
}
break;
case TIFF_FILL_ORDER:
if (value < 1 || value > 2) {
av_log(s->avctx, AV_LOG_ERROR,
"Unknown FillOrder value %d, trying default one\n", value);
value = 1;
}
s->fill_order = value - 1;
break;
case TIFF_PAL:
pal = (uint32_t *) s->palette;
off = type_sizes[type];
if (count / 3 > 256 || bytestream2_get_bytes_left(&s->gb) < count / 3 * off * 3)
return -1;
off = (type_sizes[type] - 1) << 3;
for (k = 2; k >= 0; k--) {
for (i = 0; i < count / 3; i++) {
if (k == 2)
pal[i] = 0xff << 24;
j = (tget(&s->gb, type, s->le) >> off) << (k * 8);
pal[i] |= j;
}
}
s->palette_is_set = 1;
break;
case TIFF_PLANAR:
if (value == 2) {
av_log(s->avctx, AV_LOG_ERROR, "Planar format is not supported\n");
return -1;
}
break;
case TIFF_T4OPTIONS:
if (s->compr == TIFF_G3)
s->fax_opts = value;
break;
case TIFF_T6OPTIONS:
if (s->compr == TIFF_G4)
s->fax_opts = value;
break;
#define ADD_METADATA(count, name, sep)\
if (ret = add_metadata(count, type, name, sep, s) < 0) {\
av_log(s->avctx, AV_LOG_ERROR, "Error allocating temporary buffer\n");\
return ret;\
}
case TIFF_MODEL_PIXEL_SCALE:
ADD_METADATA(count, "ModelPixelScaleTag", NULL);
break;
case TIFF_MODEL_TRANSFORMATION:
ADD_METADATA(count, "ModelTransformationTag", NULL);
break;
case TIFF_MODEL_TIEPOINT:
ADD_METADATA(count, "ModelTiepointTag", NULL);
break;
case TIFF_GEO_KEY_DIRECTORY:
ADD_METADATA(1, "GeoTIFF_Version", NULL);
ADD_METADATA(2, "GeoTIFF_Key_Revision", ".");
s->geotag_count = tget_short(&s->gb, s->le);
if (s->geotag_count > count / 4 - 1) {
s->geotag_count = count / 4 - 1;
av_log(s->avctx, AV_LOG_WARNING, "GeoTIFF key directory buffer shorter than specified\n");
}
if (bytestream2_get_bytes_left(&s->gb) < s->geotag_count * sizeof(int16_t) * 4)
return -1;
s->geotags = av_mallocz(sizeof(TiffGeoTag) * s->geotag_count);
if (!s->geotags) {
av_log(s->avctx, AV_LOG_ERROR, "Error allocating temporary buffer\n");
return AVERROR(ENOMEM);
}
for (i = 0; i < s->geotag_count; i++) {
s->geotags[i].key = tget_short(&s->gb, s->le);
s->geotags[i].type = tget_short(&s->gb, s->le);
s->geotags[i].count = tget_short(&s->gb, s->le);
if (!s->geotags[i].type)
s->geotags[i].val = get_geokey_val(s->geotags[i].key, tget_short(&s->gb, s->le));
else
s->geotags[i].offset = tget_short(&s->gb, s->le);
}
break;
case TIFF_GEO_DOUBLE_PARAMS:
if (count >= INT_MAX / sizeof(int64_t))
return AVERROR_INVALIDDATA;
if (bytestream2_get_bytes_left(&s->gb) < count * sizeof(int64_t))
return AVERROR_INVALIDDATA;
dp = av_malloc(count * sizeof(double));
if (!dp) {
av_log(s->avctx, AV_LOG_ERROR, "Error allocating temporary buffer\n");
return AVERROR(ENOMEM);
}
for (i = 0; i < count; i++)
dp[i] = tget_double(&s->gb, s->le);
for (i = 0; i < s->geotag_count; i++) {
if (s->geotags[i].type == TIFF_GEO_DOUBLE_PARAMS) {
if (s->geotags[i].count == 0
|| s->geotags[i].offset + s->geotags[i].count > count) {
av_log(s->avctx, AV_LOG_WARNING, "Invalid GeoTIFF key %d\n", s->geotags[i].key);
} else {
char *ap = doubles2str(&dp[s->geotags[i].offset], s->geotags[i].count, ", ");
if (!ap) {
av_log(s->avctx, AV_LOG_ERROR, "Error allocating temporary buffer\n");
av_freep(&dp);
return AVERROR(ENOMEM);
}
s->geotags[i].val = ap;
}
}
}
av_freep(&dp);
break;
case TIFF_GEO_ASCII_PARAMS:
pos = bytestream2_tell(&s->gb);
for (i = 0; i < s->geotag_count; i++) {
if (s->geotags[i].type == TIFF_GEO_ASCII_PARAMS) {
if (s->geotags[i].count == 0
|| s->geotags[i].offset + s->geotags[i].count > count) {
av_log(s->avctx, AV_LOG_WARNING, "Invalid GeoTIFF key %d\n", s->geotags[i].key);
} else {
char *ap;
bytestream2_seek(&s->gb, pos + s->geotags[i].offset, SEEK_SET);
if (bytestream2_get_bytes_left(&s->gb) < s->geotags[i].count)
return -1;
ap = av_malloc(s->geotags[i].count);
if (!ap) {
av_log(s->avctx, AV_LOG_ERROR, "Error allocating temporary buffer\n");
return AVERROR(ENOMEM);
}
bytestream2_get_bufferu(&s->gb, ap, s->geotags[i].count);
ap[s->geotags[i].count - 1] = '\0'; //replace the "|" delimiter with a 0 byte
s->geotags[i].val = ap;
}
}
}
break;
case TIFF_ARTIST:
ADD_METADATA(count, "artist", NULL);
break;
case TIFF_COPYRIGHT:
ADD_METADATA(count, "copyright", NULL);
break;
case TIFF_DATE:
ADD_METADATA(count, "date", NULL);
break;
case TIFF_DOCUMENT_NAME:
ADD_METADATA(count, "document_name", NULL);
break;
case TIFF_HOST_COMPUTER:
ADD_METADATA(count, "computer", NULL);
break;
case TIFF_IMAGE_DESCRIPTION:
ADD_METADATA(count, "description", NULL);
break;
case TIFF_MAKE:
ADD_METADATA(count, "make", NULL);
break;
case TIFF_MODEL:
ADD_METADATA(count, "model", NULL);
break;
case TIFF_PAGE_NAME:
ADD_METADATA(count, "page_name", NULL);
break;
case TIFF_PAGE_NUMBER:
ADD_METADATA(count, "page_number", " / ");
break;
case TIFF_SOFTWARE_NAME:
ADD_METADATA(count, "software", NULL);
break;
default:
av_log(s->avctx, AV_LOG_DEBUG, "Unknown or unsupported tag %d/0X%0X\n",
tag, tag);
}
bytestream2_seek(&s->gb, start, SEEK_SET);
return 0;
}
static int decode_frame(AVCodecContext *avctx,
void *data, int *data_size, AVPacket *avpkt)
{
TiffContext *const s = avctx->priv_data;
AVFrame *picture = data;
AVFrame *const p = &s->picture;
unsigned off;
int id, le, ret;
int i, j, entries;
int stride;
unsigned soff, ssize;
uint8_t *dst;
GetByteContext stripsizes;
GetByteContext stripdata;
bytestream2_init(&s->gb, avpkt->data, avpkt->size);
//parse image header
if (avpkt->size < 8)
return AVERROR_INVALIDDATA;
id = bytestream2_get_le16u(&s->gb);
if (id == 0x4949)
le = 1;
else if (id == 0x4D4D)
le = 0;
else {
av_log(avctx, AV_LOG_ERROR, "TIFF header not found\n");
return -1;
}
s->le = le;
s->invert = 0;
s->compr = TIFF_RAW;
s->fill_order = 0;
free_geotags(s);
/* free existing metadata */
av_dict_free(&s->picture.metadata);
// As TIFF 6.0 specification puts it "An arbitrary but carefully chosen number
// that further identifies the file as a TIFF file"
if (tget_short(&s->gb, le) != 42) {
av_log(avctx, AV_LOG_ERROR,
"The answer to life, universe and everything is not correct!\n");
return -1;
}
// Reset these offsets so we can tell if they were set this frame
s->stripsizesoff = s->strippos = 0;
/* parse image file directory */
off = tget_long(&s->gb, le);
if (off >= UINT_MAX - 14 || avpkt->size < off + 14) {
av_log(avctx, AV_LOG_ERROR, "IFD offset is greater than image size\n");
return AVERROR_INVALIDDATA;
}
bytestream2_seek(&s->gb, off, SEEK_SET);
entries = tget_short(&s->gb, le);
if (bytestream2_get_bytes_left(&s->gb) < entries * 12)
return AVERROR_INVALIDDATA;
for (i = 0; i < entries; i++) {
if (tiff_decode_tag(s) < 0)
return -1;
}
for (i = 0; i<s->geotag_count; i++) {
const char *keyname = get_geokey_name(s->geotags[i].key);
if (!keyname) {
av_log(avctx, AV_LOG_WARNING, "Unknown or unsupported GeoTIFF key %d\n", s->geotags[i].key);
continue;
}
if (get_geokey_type(s->geotags[i].key) != s->geotags[i].type) {
av_log(avctx, AV_LOG_WARNING, "Type of GeoTIFF key %d is wrong\n", s->geotags[i].key);
continue;
}
ret = av_dict_set(&s->picture.metadata, keyname, s->geotags[i].val, 0);
if (ret<0) {
av_log(avctx, AV_LOG_ERROR, "Writing metadata with key '%s' failed\n", keyname);
return ret;
}
}
if (!s->strippos && !s->stripoff) {
av_log(avctx, AV_LOG_ERROR, "Image data is missing\n");
return -1;
}
/* now we have the data and may start decoding */
if ((ret = init_image(s)) < 0)
return ret;
if (s->strips == 1 && !s->stripsize) {
av_log(avctx, AV_LOG_WARNING, "Image data size missing\n");
s->stripsize = avpkt->size - s->stripoff;
}
stride = p->linesize[0];
dst = p->data[0];
if (s->stripsizesoff) {
if (s->stripsizesoff >= avpkt->size)
return AVERROR_INVALIDDATA;
bytestream2_init(&stripsizes, avpkt->data + s->stripsizesoff, avpkt->size - s->stripsizesoff);
}
if (s->strippos) {
if (s->strippos >= avpkt->size)
return AVERROR_INVALIDDATA;
bytestream2_init(&stripdata, avpkt->data + s->strippos, avpkt->size - s->strippos);
}
for (i = 0; i < s->height; i += s->rps) {
if (s->stripsizesoff)
ssize = tget(&stripsizes, s->sstype, s->le);
else
ssize = s->stripsize;
if (s->strippos)
soff = tget(&stripdata, s->sot, s->le);
else
soff = s->stripoff;
if (soff > avpkt->size || ssize > avpkt->size - soff) {
av_log(avctx, AV_LOG_ERROR, "Invalid strip size/offset\n");
return -1;
}
if (tiff_unpack_strip(s, dst, stride, avpkt->data + soff, ssize,
FFMIN(s->rps, s->height - i)) < 0)
break;
dst += s->rps * stride;
}
if (s->predictor == 2) {
dst = p->data[0];
soff = s->bpp >> 3;
ssize = s->width * soff;
if (s->avctx->pix_fmt == PIX_FMT_RGB48LE ||
s->avctx->pix_fmt == PIX_FMT_RGBA64LE) {
for (i = 0; i < s->height; i++) {
for (j = soff; j < ssize; j += 2)
AV_WL16(dst + j, AV_RL16(dst + j) + AV_RL16(dst + j - soff));
dst += stride;
}
} else if (s->avctx->pix_fmt == PIX_FMT_RGB48BE ||
s->avctx->pix_fmt == PIX_FMT_RGBA64BE) {
for (i = 0; i < s->height; i++) {
for (j = soff; j < ssize; j += 2)
AV_WB16(dst + j, AV_RB16(dst + j) + AV_RB16(dst + j - soff));
dst += stride;
}
} else {
for (i = 0; i < s->height; i++) {
for (j = soff; j < ssize; j++)
dst[j] += dst[j - soff];
dst += stride;
}
}
}
if (s->invert) {
dst = s->picture.data[0];
for (i = 0; i < s->height; i++) {
for (j = 0; j < s->picture.linesize[0]; j++)
dst[j] = (s->avctx->pix_fmt == PIX_FMT_PAL8 ? (1<<s->bpp) - 1 : 255) - dst[j];
dst += s->picture.linesize[0];
}
}
*picture = s->picture;
*data_size = sizeof(AVPicture);
return avpkt->size;
}
static av_cold int tiff_init(AVCodecContext *avctx)
{
TiffContext *s = avctx->priv_data;
s->width = 0;
s->height = 0;
s->avctx = avctx;
avcodec_get_frame_defaults(&s->picture);
avctx->coded_frame = &s->picture;
ff_lzw_decode_open(&s->lzw);
ff_ccitt_unpack_init();
return 0;
}
static av_cold int tiff_end(AVCodecContext *avctx)
{
TiffContext *const s = avctx->priv_data;
free_geotags(s);
if (avctx->coded_frame && avctx->coded_frame->metadata)
av_dict_free(&avctx->coded_frame->metadata);
ff_lzw_decode_close(&s->lzw);
if (s->picture.data[0])
avctx->release_buffer(avctx, &s->picture);
return 0;
}
AVCodec ff_tiff_decoder = {
.name = "tiff",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_TIFF,
.priv_data_size = sizeof(TiffContext),
.init = tiff_init,
.close = tiff_end,
.decode = decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("TIFF image"),
};
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