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FFmpeg/libavcodec/tiff.c

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  1. /*

  2.  * Copyright (c) 2006 Konstantin Shishkov

  3.  *

  4.  * This file is part of FFmpeg.

  5.  *

  6.  * FFmpeg is free software; you can redistribute it and/or

  7.  * modify it under the terms of the GNU Lesser General Public

  8.  * License as published by the Free Software Foundation; either

  9.  * version 2.1 of the License, or (at your option) any later version.

  10.  *

  11.  * FFmpeg is distributed in the hope that it will be useful,

  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  14.  * Lesser General Public License for more details.

  15.  *

  16.  * You should have received a copy of the GNU Lesser General Public

  17.  * License along with FFmpeg; if not, write to the Free Software

  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  19.  */

  20. 

  21. /**

  22.  * @file

  23.  * TIFF image decoder

  24.  * @author Konstantin Shishkov

  25.  */

  26. 

  27. #include "avcodec.h"

  28. #include "bytestream.h"

  29. #include "config.h"

  30. #if CONFIG_ZLIB

  31. #include <zlib.h>

  32. #endif

  33. #include "lzw.h"

  34. #include "tiff.h"

  35. #include "tiff_data.h"

  36. #include "faxcompr.h"

  37. #include "internal.h"

  38. #include "mathops.h"

  39. #include "libavutil/attributes.h"

  40. #include "libavutil/intreadwrite.h"

  41. #include "libavutil/imgutils.h"

  42. #include "libavutil/avstring.h"

  43. 

  44. typedef struct TiffContext {

  45.     AVCodecContext *avctx;

  46.     AVFrame picture;

  47.     GetByteContext gb;

  48. 

  49.     int width, height;

  50.     unsigned int bpp, bppcount;

  51.     uint32_t palette[256];

  52.     int palette_is_set;

  53.     int le;

  54.     enum TiffCompr compr;

  55.     int invert;

  56.     int fax_opts;

  57.     int predictor;

  58.     int fill_order;

  59. 

  60.     int strips, rps, sstype;

  61.     int sot;

  62.     int stripsizesoff, stripsize, stripoff, strippos;

  63.     LZWState *lzw;

  64. 

  65.     uint8_t *deinvert_buf;

  66.     int deinvert_buf_size;

  67. 

  68.     int geotag_count;

  69.     TiffGeoTag *geotags;

  70. } TiffContext;

  71. 

  72. static unsigned tget_short(GetByteContext *gb, int le)

  73. {

  74.     unsigned v = le ? bytestream2_get_le16(gb) : bytestream2_get_be16(gb);

  75.     return v;

  76. }

  77. 

  78. static unsigned tget_long(GetByteContext *gb, int le)

  79. {

  80.     unsigned v = le ? bytestream2_get_le32(gb) : bytestream2_get_be32(gb);

  81.     return v;

  82. }

  83. 

  84. static double tget_double(GetByteContext *gb, int le)

  85. {

  86.     av_alias64 i = { .u64 = le ? bytestream2_get_le64(gb) : bytestream2_get_be64(gb)};

  87.     return i.f64;

  88. }

  89. 

  90. static unsigned tget(GetByteContext *gb, int type, int le)

  91. {

  92.     switch (type) {

  93.     case TIFF_BYTE : return bytestream2_get_byte(gb);

  94.     case TIFF_SHORT: return tget_short(gb, le);

  95.     case TIFF_LONG : return tget_long(gb, le);

  96.     default        : return UINT_MAX;

  97.     }

  98. }

  99. 

  100. static void free_geotags(TiffContext *const s)

  101. {

  102.     int i;

  103.     for (i = 0; i < s->geotag_count; i++) {

  104.         if (s->geotags[i].val)

  105.             av_freep(&s->geotags[i].val);

  106.     }

  107.     av_freep(&s->geotags);

  108. }

  109. 

  110. #define RET_GEOKEY(TYPE, array, element)\

  111.     if (key >= TIFF_##TYPE##_KEY_ID_OFFSET &&\

  112.         key - TIFF_##TYPE##_KEY_ID_OFFSET < FF_ARRAY_ELEMS(ff_tiff_##array##_name_type_map))\

  113.         return ff_tiff_##array##_name_type_map[key - TIFF_##TYPE##_KEY_ID_OFFSET].element;

  114. 

  115. static const char *get_geokey_name(int key)

  116. {

  117.     RET_GEOKEY(VERT, vert, name);

  118.     RET_GEOKEY(PROJ, proj, name);

  119.     RET_GEOKEY(GEOG, geog, name);

  120.     RET_GEOKEY(CONF, conf, name);

  121. 

  122.     return NULL;

  123. }

  124. 

  125. static int get_geokey_type(int key)

  126. {

  127.     RET_GEOKEY(VERT, vert, type);

  128.     RET_GEOKEY(PROJ, proj, type);

  129.     RET_GEOKEY(GEOG, geog, type);

  130.     RET_GEOKEY(CONF, conf, type);

  131. 

  132.     return AVERROR_INVALIDDATA;

  133. }

  134. 

  135. static int cmp_id_key(const void *id, const void *k)

  136. {

  137.     return *(const int*)id - ((const TiffGeoTagKeyName*)k)->key;

  138. }

  139. 

  140. static const char *search_keyval(const TiffGeoTagKeyName *keys, int n, int id)

  141. {

  142.     return ((TiffGeoTagKeyName*)bsearch(&id, keys, n, sizeof(keys[0]), cmp_id_key))->name;

  143. }

  144. 

  145. static char *get_geokey_val(int key, int val)

  146. {

  147.     char *ap;

  148. 

  149.     if (val == TIFF_GEO_KEY_UNDEFINED)

  150.         return av_strdup("undefined");

  151.     if (val == TIFF_GEO_KEY_USER_DEFINED)

  152.         return av_strdup("User-Defined");

  153. 

  154. #define RET_GEOKEY_VAL(TYPE, array)\

  155.     if (val >= TIFF_##TYPE##_OFFSET &&\

  156.         val - TIFF_##TYPE##_OFFSET < FF_ARRAY_ELEMS(ff_tiff_##array##_codes))\

  157.         return av_strdup(ff_tiff_##array##_codes[val - TIFF_##TYPE##_OFFSET]);

  158. 

  159.     switch (key) {

  160.     case TIFF_GT_MODEL_TYPE_GEOKEY:

  161.         RET_GEOKEY_VAL(GT_MODEL_TYPE, gt_model_type);

  162.         break;

  163.     case TIFF_GT_RASTER_TYPE_GEOKEY:

  164.         RET_GEOKEY_VAL(GT_RASTER_TYPE, gt_raster_type);

  165.         break;

  166.     case TIFF_GEOG_LINEAR_UNITS_GEOKEY:

  167.     case TIFF_PROJ_LINEAR_UNITS_GEOKEY:

  168.     case TIFF_VERTICAL_UNITS_GEOKEY:

  169.         RET_GEOKEY_VAL(LINEAR_UNIT, linear_unit);

  170.         break;

  171.     case TIFF_GEOG_ANGULAR_UNITS_GEOKEY:

  172.     case TIFF_GEOG_AZIMUTH_UNITS_GEOKEY:

  173.         RET_GEOKEY_VAL(ANGULAR_UNIT, angular_unit);

  174.         break;

  175.     case TIFF_GEOGRAPHIC_TYPE_GEOKEY:

  176.         RET_GEOKEY_VAL(GCS_TYPE, gcs_type);

  177.         RET_GEOKEY_VAL(GCSE_TYPE, gcse_type);

  178.         break;

  179.     case TIFF_GEOG_GEODETIC_DATUM_GEOKEY:

  180.         RET_GEOKEY_VAL(GEODETIC_DATUM, geodetic_datum);

  181.         RET_GEOKEY_VAL(GEODETIC_DATUM_E, geodetic_datum_e);

  182.         break;

  183.     case TIFF_GEOG_ELLIPSOID_GEOKEY:

  184.         RET_GEOKEY_VAL(ELLIPSOID, ellipsoid);

  185.         break;

  186.     case TIFF_GEOG_PRIME_MERIDIAN_GEOKEY:

  187.         RET_GEOKEY_VAL(PRIME_MERIDIAN, prime_meridian);

  188.         break;

  189.     case TIFF_PROJECTED_CS_TYPE_GEOKEY:

  190.         return av_strdup(search_keyval(ff_tiff_proj_cs_type_codes, FF_ARRAY_ELEMS(ff_tiff_proj_cs_type_codes), val));

  191.         break;

  192.     case TIFF_PROJECTION_GEOKEY:

  193.         return av_strdup(search_keyval(ff_tiff_projection_codes, FF_ARRAY_ELEMS(ff_tiff_projection_codes), val));

  194.         break;

  195.     case TIFF_PROJ_COORD_TRANS_GEOKEY:

  196.         RET_GEOKEY_VAL(COORD_TRANS, coord_trans);

  197.         break;

  198.     case TIFF_VERTICAL_CS_TYPE_GEOKEY:

  199.         RET_GEOKEY_VAL(VERT_CS, vert_cs);

  200.         RET_GEOKEY_VAL(ORTHO_VERT_CS, ortho_vert_cs);

  201.         break;

  202. 

  203.     }

  204. 

  205.     ap = av_malloc(14);

  206.     if (ap)

  207.         snprintf(ap, 14, "Unknown-%d", val);

  208.     return ap;

  209. }

  210. 

  211. static char *doubles2str(double *dp, int count, const char *sep)

  212. {

  213.     int i;

  214.     char *ap, *ap0;

  215.     int component_len;

  216.     if (!sep) sep = ", ";

  217.     component_len = 15 + strlen(sep);

  218.     ap = av_malloc(component_len * count);

  219.     if (!ap)

  220.         return NULL;

  221.     ap0   = ap;

  222.     ap[0] = '\0';

  223.     for (i = 0; i < count; i++) {

  224.         unsigned l = snprintf(ap, component_len, "%f%s", dp[i], sep);

  225.         if(l >= component_len) {

  226.             av_free(ap0);

  227.             return NULL;

  228.         }

  229.         ap += l;

  230.     }

  231.     ap0[strlen(ap0) - strlen(sep)] = '\0';

  232.     return ap0;

  233. }

  234. 

  235. static char *shorts2str(int16_t *sp, int count, const char *sep)

  236. {

  237.     int i;

  238.     char *ap, *ap0;

  239.     if (!sep) sep = ", ";

  240.     ap = av_malloc((5 + strlen(sep)) * count);

  241.     if (!ap)

  242.         return NULL;

  243.     ap0   = ap;

  244.     ap[0] = '\0';

  245.     for (i = 0; i < count; i++) {

  246.         int l = snprintf(ap, 5 + strlen(sep), "%d%s", sp[i], sep);

  247.         ap += l;

  248.     }

  249.     ap0[strlen(ap0) - strlen(sep)] = '\0';

  250.     return ap0;

  251. }

  252. 

  253. static int add_doubles_metadata(int count,

  254.                                 const char *name, const char *sep,

  255.                                 TiffContext *s)

  256. {

  257.     char *ap;

  258.     int i;

  259.     double *dp;

  260. 

  261.     if (count >= INT_MAX / sizeof(int64_t) || count <= 0)

  262.         return AVERROR_INVALIDDATA;

  263.     if (bytestream2_get_bytes_left(&s->gb) < count * sizeof(int64_t))

  264.         return AVERROR_INVALIDDATA;

  265. 

  266.     dp = av_malloc(count * sizeof(double));

  267.     if (!dp)

  268.         return AVERROR(ENOMEM);

  269. 

  270.     for (i = 0; i < count; i++)

  271.         dp[i] = tget_double(&s->gb, s->le);

  272.     ap = doubles2str(dp, count, sep);

  273.     av_freep(&dp);

  274.     if (!ap)

  275.         return AVERROR(ENOMEM);

  276.     av_dict_set(&s->picture.metadata, name, ap, AV_DICT_DONT_STRDUP_VAL);

  277.     return 0;

  278. }

  279. 

  280. static int add_shorts_metadata(int count, const char *name,

  281.                                const char *sep, TiffContext *s)

  282. {

  283.     char *ap;

  284.     int i;

  285.     int16_t *sp;

  286. 

  287.     if (count >= INT_MAX / sizeof(int16_t) || count <= 0)

  288.         return AVERROR_INVALIDDATA;

  289.     if (bytestream2_get_bytes_left(&s->gb) < count * sizeof(int16_t))

  290.         return AVERROR_INVALIDDATA;

  291. 

  292.     sp = av_malloc(count * sizeof(int16_t));

  293.     if (!sp)

  294.         return AVERROR(ENOMEM);

  295. 

  296.     for (i = 0; i < count; i++)

  297.         sp[i] = tget_short(&s->gb, s->le);

  298.     ap = shorts2str(sp, count, sep);

  299.     av_freep(&sp);

  300.     if (!ap)

  301.         return AVERROR(ENOMEM);

  302.     av_dict_set(&s->picture.metadata, name, ap, AV_DICT_DONT_STRDUP_VAL);

  303.     return 0;

  304. }

  305. 

  306. static int add_string_metadata(int count, const char *name,

  307.                                TiffContext *s)

  308. {

  309.     char *value;

  310. 

  311.     if (bytestream2_get_bytes_left(&s->gb) < count || count < 0)

  312.         return AVERROR_INVALIDDATA;

  313. 

  314.     value = av_malloc(count + 1);

  315.     if (!value)

  316.         return AVERROR(ENOMEM);

  317. 

  318.     bytestream2_get_bufferu(&s->gb, value, count);

  319.     value[count] = 0;

  320. 

  321.     av_dict_set(&s->picture.metadata, name, value, AV_DICT_DONT_STRDUP_VAL);

  322.     return 0;

  323. }

  324. 

  325. static int add_metadata(int count, int type,

  326.                         const char *name, const char *sep, TiffContext *s)

  327. {

  328.     switch(type) {

  329.     case TIFF_DOUBLE: return add_doubles_metadata(count, name, sep, s);

  330.     case TIFF_SHORT : return add_shorts_metadata(count, name, sep, s);

  331.     case TIFF_STRING: return add_string_metadata(count, name, s);

  332.     default         : return AVERROR_INVALIDDATA;

  333.     };

  334. }

  335. 

  336. #if CONFIG_ZLIB

  337. static int tiff_uncompress(uint8_t *dst, unsigned long *len, const uint8_t *src,

  338.                            int size)

  339. {

  340.     z_stream zstream = { 0 };

  341.     int zret;

  342. 

  343.     zstream.next_in = (uint8_t *)src;

  344.     zstream.avail_in = size;

  345.     zstream.next_out = dst;

  346.     zstream.avail_out = *len;

  347.     zret = inflateInit(&zstream);

  348.     if (zret != Z_OK) {

  349.         av_log(NULL, AV_LOG_ERROR, "Inflate init error: %d\n", zret);

  350.         return zret;

  351.     }

  352.     zret = inflate(&zstream, Z_SYNC_FLUSH);

  353.     inflateEnd(&zstream);

  354.     *len = zstream.total_out;

  355.     return zret == Z_STREAM_END ? Z_OK : zret;

  356. }

  357. #endif

  358. 

  359. static void av_always_inline horizontal_fill(unsigned int bpp, uint8_t* dst,

  360.                                              int usePtr, const uint8_t *src,

  361.                                              uint8_t c, int width, int offset)

  362. {

  363.     switch (bpp) {

  364.     case 1:

  365.         while (--width >= 0) {

  366.             dst[(width+offset)*8+7] = (usePtr ? src[width] : c)      & 0x1;

  367.             dst[(width+offset)*8+6] = (usePtr ? src[width] : c) >> 1 & 0x1;

  368.             dst[(width+offset)*8+5] = (usePtr ? src[width] : c) >> 2 & 0x1;

  369.             dst[(width+offset)*8+4] = (usePtr ? src[width] : c) >> 3 & 0x1;

  370.             dst[(width+offset)*8+3] = (usePtr ? src[width] : c) >> 4 & 0x1;

  371.             dst[(width+offset)*8+2] = (usePtr ? src[width] : c) >> 5 & 0x1;

  372.             dst[(width+offset)*8+1] = (usePtr ? src[width] : c) >> 6 & 0x1;

  373.             dst[(width+offset)*8+0] = (usePtr ? src[width] : c) >> 7;

  374.         }

  375.         break;

  376.     case 2:

  377.         while (--width >= 0) {

  378.             dst[(width+offset)*4+3] = (usePtr ? src[width] : c) & 0x3;

  379.             dst[(width+offset)*4+2] = (usePtr ? src[width] : c) >> 2 & 0x3;

  380.             dst[(width+offset)*4+1] = (usePtr ? src[width] : c) >> 4 & 0x3;

  381.             dst[(width+offset)*4+0] = (usePtr ? src[width] : c) >> 6;

  382.         }

  383.         break;

  384.     case 4:

  385.         while (--width >= 0) {

  386.             dst[(width+offset)*2+1] = (usePtr ? src[width] : c) & 0xF;

  387.             dst[(width+offset)*2+0] = (usePtr ? src[width] : c) >> 4;

  388.         }

  389.         break;

  390.     default:

  391.         if (usePtr) {

  392.             memcpy(dst + offset, src, width);

  393.         } else {

  394.             memset(dst + offset, c, width);

  395.         }

  396.     }

  397. }

  398. 

  399. static int tiff_unpack_strip(TiffContext *s, uint8_t *dst, int stride,

  400.                              const uint8_t *src, int size, int lines)

  401. {

  402.     int c, line, pixels, code, ret;

  403.     const uint8_t *ssrc = src;

  404.     int width = ((s->width * s->bpp) + 7) >> 3;

  405. 

  406.     if (size <= 0)

  407.         return AVERROR_INVALIDDATA;

  408. 

  409. #if CONFIG_ZLIB

  410.     if (s->compr == TIFF_DEFLATE || s->compr == TIFF_ADOBE_DEFLATE) {

  411.         uint8_t *src2 = NULL, *zbuf;

  412.         unsigned long outlen;

  413.         int i, ret;

  414.         outlen = width * lines;

  415.         zbuf = av_malloc(outlen);

  416.         if (!zbuf)

  417.             return AVERROR(ENOMEM);

  418.         if (s->fill_order) {

  419.             src2 = av_malloc((unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE);

  420.             if (!src2) {

  421.                 av_log(s->avctx, AV_LOG_ERROR, "Error allocating temporary buffer\n");

  422.                 av_free(zbuf);

  423.                 return AVERROR(ENOMEM);

  424.             }

  425.             for (i = 0; i < size; i++)

  426.                 src2[i] = ff_reverse[src[i]];

  427.             memset(src2 + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

  428.             src = src2;

  429.         }

  430.         ret = tiff_uncompress(zbuf, &outlen, src, size);

  431.         if (ret != Z_OK) {

  432.             av_log(s->avctx, AV_LOG_ERROR,

  433.                    "Uncompressing failed (%lu of %lu) with error %d\n", outlen,

  434.                    (unsigned long)width * lines, ret);

  435.             av_free(src2);

  436.             av_free(zbuf);

  437.             return AVERROR_UNKNOWN;

  438.         }

  439.         src = zbuf;

  440.         for (line = 0; line < lines; line++) {

  441.             if(s->bpp < 8 && s->avctx->pix_fmt == AV_PIX_FMT_PAL8){

  442.                 horizontal_fill(s->bpp, dst, 1, src, 0, width, 0);

  443.             }else{

  444.                 memcpy(dst, src, width);

  445.             }

  446.             dst += stride;

  447.             src += width;

  448.         }

  449.         av_free(src2);

  450.         av_free(zbuf);

  451.         return 0;

  452.     }

  453. #endif

  454.     if (s->compr == TIFF_LZW) {

  455.         if (s->fill_order) {

  456.             int i;

  457.             av_fast_padded_malloc(&s->deinvert_buf, &s->deinvert_buf_size, size);

  458.             if (!s->deinvert_buf)

  459.                 return AVERROR(ENOMEM);

  460.             for (i = 0; i < size; i++)

  461.                 s->deinvert_buf[i] = ff_reverse[src[i]];

  462.             src = s->deinvert_buf;

  463.             ssrc = src;

  464.         }

  465.         if (size > 1 && !src[0] && (src[1]&1)) {

  466.             av_log(s->avctx, AV_LOG_ERROR, "Old style LZW is unsupported\n");

  467.         }

  468.         if ((ret = ff_lzw_decode_init(s->lzw, 8, src, size, FF_LZW_TIFF)) < 0) {

  469.             av_log(s->avctx, AV_LOG_ERROR, "Error initializing LZW decoder\n");

  470.             return ret;

  471.         }

  472.     }

  473.     if (s->compr == TIFF_CCITT_RLE || s->compr == TIFF_G3

  474.         || s->compr == TIFF_G4) {

  475.         int i, ret = 0;

  476.         uint8_t *src2 = av_malloc((unsigned)size +

  477.                                   FF_INPUT_BUFFER_PADDING_SIZE);

  478. 

  479.         if (!src2) {

  480.             av_log(s->avctx, AV_LOG_ERROR,

  481.                    "Error allocating temporary buffer\n");

  482.             return AVERROR(ENOMEM);

  483.         }

  484.         if (s->fax_opts & 2) {

  485.             av_log(s->avctx, AV_LOG_ERROR,

  486.                    "Uncompressed fax mode is not supported (yet)\n");

  487.             av_free(src2);

  488.             return AVERROR_INVALIDDATA;

  489.         }

  490.         if (!s->fill_order) {

  491.             memcpy(src2, src, size);

  492.         } else {

  493.             for (i = 0; i < size; i++)

  494.                 src2[i] = ff_reverse[src[i]];

  495.         }

  496.         memset(src2 + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

  497.         switch (s->compr) {

  498.         case TIFF_CCITT_RLE:

  499.         case TIFF_G3:

  500.         case TIFF_G4:

  501.             ret = ff_ccitt_unpack(s->avctx, src2, size, dst, lines, stride,

  502.                                   s->compr, s->fax_opts);

  503.             break;

  504.         }

  505.         if (s->bpp < 8 && s->avctx->pix_fmt == AV_PIX_FMT_PAL8)

  506.             for (line = 0; line < lines; line++) {

  507.                 horizontal_fill(s->bpp, dst, 1, dst, 0, width, 0);

  508.                 dst += stride;

  509.             }

  510.         av_free(src2);

  511.         return ret;

  512.     }

  513.     for (line = 0; line < lines; line++) {

  514.         if (src - ssrc > size) {

  515.             av_log(s->avctx, AV_LOG_ERROR, "Source data overread\n");

  516.             return AVERROR_INVALIDDATA;

  517.         }

  518.         switch (s->compr) {

  519.         case TIFF_RAW:

  520.             if (ssrc + size - src < width)

  521.                 return AVERROR_INVALIDDATA;

  522.             if (!s->fill_order) {

  523.                 horizontal_fill(s->bpp * (s->avctx->pix_fmt == AV_PIX_FMT_PAL8),

  524.                                 dst, 1, src, 0, width, 0);

  525.             } else {

  526.                 int i;

  527.                 for (i = 0; i < width; i++)

  528.                     dst[i] = ff_reverse[src[i]];

  529.             }

  530.             src += width;

  531.             break;

  532.         case TIFF_PACKBITS:

  533.             for (pixels = 0; pixels < width;) {

  534.                 if (ssrc + size - src < 2) {

  535.                     av_log(s->avctx, AV_LOG_ERROR, "Read went out of bounds\n");

  536.                     return AVERROR_INVALIDDATA;

  537.                 }

  538.                 code = (int8_t) * src++;

  539.                 if (code >= 0) {

  540.                     code++;

  541.                     if (pixels + code > width) {

  542.                         av_log(s->avctx, AV_LOG_ERROR,

  543.                                "Copy went out of bounds\n");

  544.                         return AVERROR_INVALIDDATA;

  545.                     }

  546.                     if (ssrc + size - src < code) {

  547.                         av_log(s->avctx, AV_LOG_ERROR, "Read went out of bounds\n");

  548.                         return AVERROR_INVALIDDATA;

  549.                     }

  550.                     horizontal_fill(s->bpp * (s->avctx->pix_fmt == AV_PIX_FMT_PAL8),

  551.                                     dst, 1, src, 0, code, pixels);

  552.                     src += code;

  553.                     pixels += code;

  554.                 } else if (code != -128) { // -127..-1

  555.                     code = (-code) + 1;

  556.                     if (pixels + code > width) {

  557.                         av_log(s->avctx, AV_LOG_ERROR,

  558.                                "Run went out of bounds\n");

  559.                         return AVERROR_INVALIDDATA;

  560.                     }

  561.                     c = *src++;

  562.                     horizontal_fill(s->bpp * (s->avctx->pix_fmt == AV_PIX_FMT_PAL8),

  563.                                     dst, 0, NULL, c, code, pixels);

  564.                     pixels += code;

  565.                 }

  566.             }

  567.             break;

  568.         case TIFF_LZW:

  569.             pixels = ff_lzw_decode(s->lzw, dst, width);

  570.             if (pixels < width) {

  571.                 av_log(s->avctx, AV_LOG_ERROR, "Decoded only %i bytes of %i\n",

  572.                        pixels, width);

  573.                 return AVERROR_INVALIDDATA;

  574.             }

  575.             if (s->bpp < 8 && s->avctx->pix_fmt == AV_PIX_FMT_PAL8)

  576.                 horizontal_fill(s->bpp, dst, 1, dst, 0, width, 0);

  577.             break;

  578.         }

  579.         dst += stride;

  580.     }

  581.     return 0;

  582. }

  583. 

  584. static int init_image(TiffContext *s)

  585. {

  586.     int i, ret;

  587.     uint32_t *pal;

  588. 

  589.     switch (s->bpp * 10 + s->bppcount) {

  590.     case 11:

  591.         if (!s->palette_is_set) {

  592.             s->avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;

  593.             break;

  594.         }

  595.     case 21:

  596.     case 41:

  597.     case 81:

  598.         s->avctx->pix_fmt = AV_PIX_FMT_PAL8;

  599.         break;

  600.     case 243:

  601.         s->avctx->pix_fmt = AV_PIX_FMT_RGB24;

  602.         break;

  603.     case 161:

  604.         s->avctx->pix_fmt = s->le ? AV_PIX_FMT_GRAY16LE : AV_PIX_FMT_GRAY16BE;

  605.         break;

  606.     case 162:

  607.         s->avctx->pix_fmt = AV_PIX_FMT_GRAY8A;

  608.         break;

  609.     case 324:

  610.         s->avctx->pix_fmt = AV_PIX_FMT_RGBA;

  611.         break;

  612.     case 483:

  613.         s->avctx->pix_fmt = s->le ? AV_PIX_FMT_RGB48LE : AV_PIX_FMT_RGB48BE;

  614.         break;

  615.     case 644:

  616.         s->avctx->pix_fmt = s->le ? AV_PIX_FMT_RGBA64LE : AV_PIX_FMT_RGBA64BE;

  617.         break;

  618.     default:

  619.         av_log(s->avctx, AV_LOG_ERROR,

  620.                "This format is not supported (bpp=%d, bppcount=%d)\n",

  621.                s->bpp, s->bppcount);

  622.         return AVERROR_INVALIDDATA;

  623.     }

  624.     if (s->width != s->avctx->width || s->height != s->avctx->height) {

  625.         if ((ret = av_image_check_size(s->width, s->height, 0, s->avctx)) < 0)

  626.             return ret;

  627.         avcodec_set_dimensions(s->avctx, s->width, s->height);

  628.     }

  629.     if (s->picture.data[0])

  630.         s->avctx->release_buffer(s->avctx, &s->picture);

  631.     if ((ret = ff_get_buffer(s->avctx, &s->picture)) < 0) {

  632.         av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  633.         return ret;

  634.     }

  635.     if (s->avctx->pix_fmt == AV_PIX_FMT_PAL8) {

  636.         if (s->palette_is_set) {

  637.             memcpy(s->picture.data[1], s->palette, sizeof(s->palette));

  638.         } else {

  639.             /* make default grayscale pal */

  640.             pal = (uint32_t *) s->picture.data[1];

  641.             for (i = 0; i < 1<<s->bpp; i++)

  642.                 pal[i] = 0xFFU << 24 | i * 255 / ((1<<s->bpp) - 1) * 0x010101;

  643.         }

  644.     }

  645.     return 0;

  646. }

  647. 

  648. static int tiff_decode_tag(TiffContext *s)

  649. {

  650.     unsigned tag, type, count, off, value = 0;

  651.     int i, j, k, pos, start;

  652.     int ret;

  653.     uint32_t *pal;

  654.     double *dp;

  655. 

  656.     tag   = tget_short(&s->gb, s->le);

  657.     type  = tget_short(&s->gb, s->le);

  658.     count = tget_long(&s->gb, s->le);

  659.     off   = tget_long(&s->gb, s->le);

  660.     start = bytestream2_tell(&s->gb);

  661. 

  662.     if (type == 0 || type >= FF_ARRAY_ELEMS(type_sizes)) {

  663.         av_log(s->avctx, AV_LOG_DEBUG, "Unknown tiff type (%u) encountered\n",

  664.                type);

  665.         return 0;

  666.     }

  667. 

  668.     if (count == 1) {

  669.         switch (type) {

  670.         case TIFF_BYTE:

  671.         case TIFF_SHORT:

  672.             bytestream2_seek(&s->gb, -4, SEEK_CUR);

  673.             value = tget(&s->gb, type, s->le);

  674.             break;

  675.         case TIFF_LONG:

  676.             value = off;

  677.             break;

  678.         case TIFF_STRING:

  679.             if (count <= 4) {

  680.                 bytestream2_seek(&s->gb, -4, SEEK_CUR);

  681.                 break;

  682.             }

  683.         default:

  684.             value = UINT_MAX;

  685.             bytestream2_seek(&s->gb, off, SEEK_SET);

  686.         }

  687.     } else {

  688.         if (count <= 4 && type_sizes[type] * count <= 4) {

  689.             bytestream2_seek(&s->gb, -4, SEEK_CUR);

  690.         } else {

  691.             bytestream2_seek(&s->gb, off, SEEK_SET);

  692.         }

  693.     }

  694. 

  695.     switch (tag) {

  696.     case TIFF_WIDTH:

  697.         s->width = value;

  698.         break;

  699.     case TIFF_HEIGHT:

  700.         s->height = value;

  701.         break;

  702.     case TIFF_BPP:

  703.         s->bppcount = count;

  704.         if (count > 4) {

  705.             av_log(s->avctx, AV_LOG_ERROR,

  706.                    "This format is not supported (bpp=%d, %d components)\n",

  707.                    s->bpp, count);

  708.             return AVERROR_INVALIDDATA;

  709.         }

  710.         if (count == 1)

  711.             s->bpp = value;

  712.         else {

  713.             switch (type) {

  714.             case TIFF_BYTE:

  715.                 s->bpp = (off & 0xFF) + ((off >> 8) & 0xFF) +

  716.                          ((off >> 16) & 0xFF) + ((off >> 24) & 0xFF);

  717.                 break;

  718.             case TIFF_SHORT:

  719.             case TIFF_LONG:

  720.                 s->bpp = 0;

  721.                 if (bytestream2_get_bytes_left(&s->gb) < type_sizes[type] * count)

  722.                     return AVERROR_INVALIDDATA;

  723.                 for (i = 0; i < count; i++)

  724.                     s->bpp += tget(&s->gb, type, s->le);

  725.                 break;

  726.             default:

  727.                 s->bpp = -1;

  728.             }

  729.         }

  730.         break;

  731.     case TIFF_SAMPLES_PER_PIXEL:

  732.         if (count != 1) {

  733.             av_log(s->avctx, AV_LOG_ERROR,

  734.                    "Samples per pixel requires a single value, many provided\n");

  735.             return AVERROR_INVALIDDATA;

  736.         }

  737.         if (s->bppcount == 1)

  738.             s->bpp *= value;

  739.         s->bppcount = value;

  740.         break;

  741.     case TIFF_COMPR:

  742.         s->compr = value;

  743.         s->predictor = 0;

  744.         switch (s->compr) {

  745.         case TIFF_RAW:

  746.         case TIFF_PACKBITS:

  747.         case TIFF_LZW:

  748.         case TIFF_CCITT_RLE:

  749.             break;

  750.         case TIFF_G3:

  751.         case TIFF_G4:

  752.             s->fax_opts = 0;

  753.             break;

  754.         case TIFF_DEFLATE:

  755.         case TIFF_ADOBE_DEFLATE:

  756. #if CONFIG_ZLIB

  757.             break;

  758. #else

  759.             av_log(s->avctx, AV_LOG_ERROR, "Deflate: ZLib not compiled in\n");

  760.             return AVERROR(ENOSYS);

  761. #endif

  762.         case TIFF_JPEG:

  763.         case TIFF_NEWJPEG:

  764.             av_log(s->avctx, AV_LOG_ERROR,

  765.                    "JPEG compression is not supported\n");

  766.             return AVERROR_PATCHWELCOME;

  767.         default:

  768.             av_log(s->avctx, AV_LOG_ERROR, "Unknown compression method %i\n",

  769.                    s->compr);

  770.             return AVERROR_INVALIDDATA;

  771.         }

  772.         break;

  773.     case TIFF_ROWSPERSTRIP:

  774.         if (type == TIFF_LONG && value == UINT_MAX)

  775.             value = s->height;

  776.         if (value < 1) {

  777.             av_log(s->avctx, AV_LOG_ERROR,

  778.                    "Incorrect value of rows per strip\n");

  779.             return AVERROR_INVALIDDATA;

  780.         }

  781.         s->rps = value;

  782.         break;

  783.     case TIFF_STRIP_OFFS:

  784.         if (count == 1) {

  785.             s->strippos = 0;

  786.             s->stripoff = value;

  787.         } else

  788.             s->strippos = off;

  789.         s->strips = count;

  790.         if (s->strips == 1)

  791.             s->rps = s->height;

  792.         s->sot = type;

  793.         if (s->strippos > bytestream2_size(&s->gb)) {

  794.             av_log(s->avctx, AV_LOG_ERROR,

  795.                    "Tag referencing position outside the image\n");

  796.             return AVERROR_INVALIDDATA;

  797.         }

  798.         break;

  799.     case TIFF_STRIP_SIZE:

  800.         if (count == 1) {

  801.             s->stripsizesoff = 0;

  802.             s->stripsize = value;

  803.             s->strips = 1;

  804.         } else {

  805.             s->stripsizesoff = off;

  806.         }

  807.         s->strips = count;

  808.         s->sstype = type;

  809.         if (s->stripsizesoff > bytestream2_size(&s->gb)) {

  810.             av_log(s->avctx, AV_LOG_ERROR,

  811.                    "Tag referencing position outside the image\n");

  812.             return AVERROR_INVALIDDATA;

  813.         }

  814.         break;

  815.     case TIFF_TILE_BYTE_COUNTS:

  816.     case TIFF_TILE_LENGTH:

  817.     case TIFF_TILE_OFFSETS:

  818.     case TIFF_TILE_WIDTH:

  819.         av_log(s->avctx, AV_LOG_ERROR, "Tiled images are not supported\n");

  820.         return AVERROR_PATCHWELCOME;

  821.         break;

  822.     case TIFF_PREDICTOR:

  823.         s->predictor = value;

  824.         break;

  825.     case TIFF_INVERT:

  826.         switch (value) {

  827.         case 0:

  828.             s->invert = 1;

  829.             break;

  830.         case 1:

  831.             s->invert = 0;

  832.             break;

  833.         case 2:

  834.         case 3:

  835.             break;

  836.         default:

  837.             av_log(s->avctx, AV_LOG_ERROR, "Color mode %d is not supported\n",

  838.                    value);

  839.             return AVERROR_INVALIDDATA;

  840.         }

  841.         break;

  842.     case TIFF_FILL_ORDER:

  843.         if (value < 1 || value > 2) {

  844.             av_log(s->avctx, AV_LOG_ERROR,

  845.                    "Unknown FillOrder value %d, trying default one\n", value);

  846.             value = 1;

  847.         }

  848.         s->fill_order = value - 1;

  849.         break;

  850.     case TIFF_PAL:

  851.         pal = (uint32_t *) s->palette;

  852.         off = type_sizes[type];

  853.         if (count / 3 > 256 || bytestream2_get_bytes_left(&s->gb) < count / 3 * off * 3)

  854.             return AVERROR_INVALIDDATA;

  855.         off = (type_sizes[type] - 1) << 3;

  856.         for (k = 2; k >= 0; k--) {

  857.             for (i = 0; i < count / 3; i++) {

  858.                 if (k == 2)

  859.                     pal[i] = 0xFFU << 24;

  860.                 j =  (tget(&s->gb, type, s->le) >> off) << (k * 8);

  861.                 pal[i] |= j;

  862.             }

  863.         }

  864.         s->palette_is_set = 1;

  865.         break;

  866.     case TIFF_PLANAR:

  867.         if (value == 2) {

  868.             av_log(s->avctx, AV_LOG_ERROR, "Planar format is not supported\n");

  869.             return AVERROR_PATCHWELCOME;

  870.         }

  871.         break;

  872.     case TIFF_T4OPTIONS:

  873.         if (s->compr == TIFF_G3)

  874.             s->fax_opts = value;

  875.         break;

  876.     case TIFF_T6OPTIONS:

  877.         if (s->compr == TIFF_G4)

  878.             s->fax_opts = value;

  879.         break;

  880. #define ADD_METADATA(count, name, sep)\

  881.     if ((ret = add_metadata(count, type, name, sep, s)) < 0) {\

  882.         av_log(s->avctx, AV_LOG_ERROR, "Error allocating temporary buffer\n");\

  883.         return ret;\

  884.     }

  885.     case TIFF_MODEL_PIXEL_SCALE:

  886.         ADD_METADATA(count, "ModelPixelScaleTag", NULL);

  887.         break;

  888.     case TIFF_MODEL_TRANSFORMATION:

  889.         ADD_METADATA(count, "ModelTransformationTag", NULL);

  890.         break;

  891.     case TIFF_MODEL_TIEPOINT:

  892.         ADD_METADATA(count, "ModelTiepointTag", NULL);

  893.         break;

  894.     case TIFF_GEO_KEY_DIRECTORY:

  895.         ADD_METADATA(1, "GeoTIFF_Version", NULL);

  896.         ADD_METADATA(2, "GeoTIFF_Key_Revision", ".");

  897.         s->geotag_count   = tget_short(&s->gb, s->le);

  898.         if (s->geotag_count > count / 4 - 1) {

  899.             s->geotag_count = count / 4 - 1;

  900.             av_log(s->avctx, AV_LOG_WARNING, "GeoTIFF key directory buffer shorter than specified\n");

  901.         }

  902.         if (bytestream2_get_bytes_left(&s->gb) < s->geotag_count * sizeof(int16_t) * 4)

  903.             return -1;

  904.         s->geotags = av_mallocz(sizeof(TiffGeoTag) * s->geotag_count);

  905.         if (!s->geotags) {

  906.             av_log(s->avctx, AV_LOG_ERROR, "Error allocating temporary buffer\n");

  907.             return AVERROR(ENOMEM);

  908.         }

  909.         for (i = 0; i < s->geotag_count; i++) {

  910.             s->geotags[i].key    = tget_short(&s->gb, s->le);

  911.             s->geotags[i].type   = tget_short(&s->gb, s->le);

  912.             s->geotags[i].count  = tget_short(&s->gb, s->le);

  913. 

  914.             if (!s->geotags[i].type)

  915.                 s->geotags[i].val  = get_geokey_val(s->geotags[i].key, tget_short(&s->gb, s->le));

  916.             else

  917.                 s->geotags[i].offset = tget_short(&s->gb, s->le);

  918.         }

  919.         break;

  920.     case TIFF_GEO_DOUBLE_PARAMS:

  921.         if (count >= INT_MAX / sizeof(int64_t))

  922.             return AVERROR_INVALIDDATA;

  923.         if (bytestream2_get_bytes_left(&s->gb) < count * sizeof(int64_t))

  924.             return AVERROR_INVALIDDATA;

  925.         dp = av_malloc(count * sizeof(double));

  926.         if (!dp) {

  927.             av_log(s->avctx, AV_LOG_ERROR, "Error allocating temporary buffer\n");

  928.             return AVERROR(ENOMEM);

  929.         }

  930.         for (i = 0; i < count; i++)

  931.             dp[i] = tget_double(&s->gb, s->le);

  932.         for (i = 0; i < s->geotag_count; i++) {

  933.             if (s->geotags[i].type == TIFF_GEO_DOUBLE_PARAMS) {

  934.                 if (s->geotags[i].count == 0

  935.                     || s->geotags[i].offset + s->geotags[i].count > count) {

  936.                     av_log(s->avctx, AV_LOG_WARNING, "Invalid GeoTIFF key %d\n", s->geotags[i].key);

  937.                 } else {

  938.                     char *ap = doubles2str(&dp[s->geotags[i].offset], s->geotags[i].count, ", ");

  939.                     if (!ap) {

  940.                         av_log(s->avctx, AV_LOG_ERROR, "Error allocating temporary buffer\n");

  941.                         av_freep(&dp);

  942.                         return AVERROR(ENOMEM);

  943.                     }

  944.                     s->geotags[i].val = ap;

  945.                 }

  946.             }

  947.         }

  948.         av_freep(&dp);

  949.         break;

  950.     case TIFF_GEO_ASCII_PARAMS:

  951.         pos = bytestream2_tell(&s->gb);

  952.         for (i = 0; i < s->geotag_count; i++) {

  953.             if (s->geotags[i].type == TIFF_GEO_ASCII_PARAMS) {

  954.                 if (s->geotags[i].count == 0

  955.                     || s->geotags[i].offset +  s->geotags[i].count > count) {

  956.                     av_log(s->avctx, AV_LOG_WARNING, "Invalid GeoTIFF key %d\n", s->geotags[i].key);

  957.                 } else {

  958.                     char *ap;

  959. 

  960.                     bytestream2_seek(&s->gb, pos + s->geotags[i].offset, SEEK_SET);

  961.                     if (bytestream2_get_bytes_left(&s->gb) < s->geotags[i].count)

  962.                         return AVERROR_INVALIDDATA;

  963.                     ap = av_malloc(s->geotags[i].count);

  964.                     if (!ap) {

  965.                         av_log(s->avctx, AV_LOG_ERROR, "Error allocating temporary buffer\n");

  966.                         return AVERROR(ENOMEM);

  967.                     }

  968.                     bytestream2_get_bufferu(&s->gb, ap, s->geotags[i].count);

  969.                     ap[s->geotags[i].count - 1] = '\0'; //replace the "|" delimiter with a 0 byte

  970.                     s->geotags[i].val = ap;

  971.                 }

  972.             }

  973.         }

  974.         break;

  975.     case TIFF_ARTIST:

  976.         ADD_METADATA(count, "artist", NULL);

  977.         break;

  978.     case TIFF_COPYRIGHT:

  979.         ADD_METADATA(count, "copyright", NULL);

  980.         break;

  981.     case TIFF_DATE:

  982.         ADD_METADATA(count, "date", NULL);

  983.         break;

  984.     case TIFF_DOCUMENT_NAME:

  985.         ADD_METADATA(count, "document_name", NULL);

  986.         break;

  987.     case TIFF_HOST_COMPUTER:

  988.         ADD_METADATA(count, "computer", NULL);

  989.         break;

  990.     case TIFF_IMAGE_DESCRIPTION:

  991.         ADD_METADATA(count, "description", NULL);

  992.         break;

  993.     case TIFF_MAKE:

  994.         ADD_METADATA(count, "make", NULL);

  995.         break;

  996.     case TIFF_MODEL:

  997.         ADD_METADATA(count, "model", NULL);

  998.         break;

  999.     case TIFF_PAGE_NAME:

  1000.         ADD_METADATA(count, "page_name", NULL);

  1001.         break;

  1002.     case TIFF_PAGE_NUMBER:

  1003.         ADD_METADATA(count, "page_number", " / ");

  1004.         break;

  1005.     case TIFF_SOFTWARE_NAME:

  1006.         ADD_METADATA(count, "software", NULL);

  1007.         break;

  1008.     default:

  1009.         av_log(s->avctx, AV_LOG_DEBUG, "Unknown or unsupported tag %d/0X%0X\n",

  1010.                tag, tag);

  1011.     }

  1012.     bytestream2_seek(&s->gb, start, SEEK_SET);

  1013.     return 0;

  1014. }

  1015. 

  1016. static int decode_frame(AVCodecContext *avctx,

  1017.                         void *data, int *got_frame, AVPacket *avpkt)

  1018. {

  1019.     TiffContext *const s = avctx->priv_data;

  1020.     AVFrame *picture = data;

  1021.     AVFrame *const p = &s->picture;

  1022.     unsigned off;

  1023.     int id, le, ret;

  1024.     int i, j, entries;

  1025.     int stride;

  1026.     unsigned soff, ssize;

  1027.     uint8_t *dst;

  1028.     GetByteContext stripsizes;

  1029.     GetByteContext stripdata;

  1030. 

  1031.     bytestream2_init(&s->gb, avpkt->data, avpkt->size);

  1032. 

  1033.     //parse image header

  1034.     if (avpkt->size < 8)

  1035.         return AVERROR_INVALIDDATA;

  1036.     id = bytestream2_get_le16u(&s->gb);

  1037.     if (id == 0x4949)

  1038.         le = 1;

  1039.     else if (id == 0x4D4D)

  1040.         le = 0;

  1041.     else {

  1042.         av_log(avctx, AV_LOG_ERROR, "TIFF header not found\n");

  1043.         return AVERROR_INVALIDDATA;

  1044.     }

  1045.     s->le = le;

  1046.     // TIFF_BPP is not a required tag and defaults to 1

  1047.     s->bppcount = s->bpp = 1;

  1048.     s->invert = 0;

  1049.     s->compr = TIFF_RAW;

  1050.     s->fill_order = 0;

  1051.     free_geotags(s);

  1052.     /* metadata has been destroyed from lavc internals, that pointer is not

  1053.      * valid anymore */

  1054.     s->picture.metadata = NULL;

  1055. 

  1056.     // As TIFF 6.0 specification puts it "An arbitrary but carefully chosen number

  1057.     // that further identifies the file as a TIFF file"

  1058.     if (tget_short(&s->gb, le) != 42) {

  1059.         av_log(avctx, AV_LOG_ERROR,

  1060.                "The answer to life, universe and everything is not correct!\n");

  1061.         return AVERROR_INVALIDDATA;

  1062.     }

  1063.     // Reset these offsets so we can tell if they were set this frame

  1064.     s->stripsizesoff = s->strippos = 0;

  1065.     /* parse image file directory */

  1066.     off = tget_long(&s->gb, le);

  1067.     if (off >= UINT_MAX - 14 || avpkt->size < off + 14) {

  1068.         av_log(avctx, AV_LOG_ERROR, "IFD offset is greater than image size\n");

  1069.         return AVERROR_INVALIDDATA;

  1070.     }

  1071.     bytestream2_seek(&s->gb, off, SEEK_SET);

  1072.     entries = tget_short(&s->gb, le);

  1073.     if (bytestream2_get_bytes_left(&s->gb) < entries * 12)

  1074.         return AVERROR_INVALIDDATA;

  1075.     for (i = 0; i < entries; i++) {

  1076.         if ((ret = tiff_decode_tag(s)) < 0)

  1077.             return ret;

  1078.     }

  1079. 

  1080.     for (i = 0; i<s->geotag_count; i++) {

  1081.         const char *keyname = get_geokey_name(s->geotags[i].key);

  1082.         if (!keyname) {

  1083.             av_log(avctx, AV_LOG_WARNING, "Unknown or unsupported GeoTIFF key %d\n", s->geotags[i].key);

  1084.             continue;

  1085.         }

  1086.         if (get_geokey_type(s->geotags[i].key) != s->geotags[i].type) {

  1087.             av_log(avctx, AV_LOG_WARNING, "Type of GeoTIFF key %d is wrong\n", s->geotags[i].key);

  1088.             continue;

  1089.         }

  1090.         ret = av_dict_set(&s->picture.metadata, keyname, s->geotags[i].val, 0);

  1091.         if (ret<0) {

  1092.             av_log(avctx, AV_LOG_ERROR, "Writing metadata with key '%s' failed\n", keyname);

  1093.             return ret;

  1094.         }

  1095.     }

  1096. 

  1097.     if (!s->strippos && !s->stripoff) {

  1098.         av_log(avctx, AV_LOG_ERROR, "Image data is missing\n");

  1099.         return AVERROR_INVALIDDATA;

  1100.     }

  1101.     /* now we have the data and may start decoding */

  1102.     if ((ret = init_image(s)) < 0)

  1103.         return ret;

  1104. 

  1105.     if (s->strips == 1 && !s->stripsize) {

  1106.         av_log(avctx, AV_LOG_WARNING, "Image data size missing\n");

  1107.         s->stripsize = avpkt->size - s->stripoff;

  1108.     }

  1109.     stride = p->linesize[0];

  1110.     dst = p->data[0];

  1111. 

  1112.     if (s->stripsizesoff) {

  1113.         if (s->stripsizesoff >= (unsigned)avpkt->size)

  1114.             return AVERROR_INVALIDDATA;

  1115.         bytestream2_init(&stripsizes, avpkt->data + s->stripsizesoff, avpkt->size - s->stripsizesoff);

  1116.     }

  1117.     if (s->strippos) {

  1118.         if (s->strippos >= (unsigned)avpkt->size)

  1119.             return AVERROR_INVALIDDATA;

  1120.         bytestream2_init(&stripdata, avpkt->data + s->strippos, avpkt->size - s->strippos);

  1121.     }

  1122. 

  1123.     if (s->rps <= 0) {

  1124.         av_log(avctx, AV_LOG_ERROR, "rps %d invalid\n", s->rps);

  1125.         return AVERROR_INVALIDDATA;

  1126.     }

  1127. 

  1128.     for (i = 0; i < s->height; i += s->rps) {

  1129.         if (s->stripsizesoff)

  1130.             ssize = tget(&stripsizes, s->sstype, s->le);

  1131.         else

  1132.             ssize = s->stripsize;

  1133. 

  1134.         if (s->strippos)

  1135.             soff = tget(&stripdata, s->sot, s->le);

  1136.         else

  1137.             soff = s->stripoff;

  1138. 

  1139.         if (soff > avpkt->size || ssize > avpkt->size - soff) {

  1140.             av_log(avctx, AV_LOG_ERROR, "Invalid strip size/offset\n");

  1141.             return AVERROR_INVALIDDATA;

  1142.         }

  1143.         if (tiff_unpack_strip(s, dst, stride, avpkt->data + soff, ssize,

  1144.                               FFMIN(s->rps, s->height - i)) < 0)

  1145.             break;

  1146.         dst += s->rps * stride;

  1147.     }

  1148.     if (s->predictor == 2) {

  1149.         dst = p->data[0];

  1150.         soff = s->bpp >> 3;

  1151.         ssize = s->width * soff;

  1152.         if (s->avctx->pix_fmt == AV_PIX_FMT_RGB48LE ||

  1153.             s->avctx->pix_fmt == AV_PIX_FMT_RGBA64LE) {

  1154.             for (i = 0; i < s->height; i++) {

  1155.                 for (j = soff; j < ssize; j += 2)

  1156.                     AV_WL16(dst + j, AV_RL16(dst + j) + AV_RL16(dst + j - soff));

  1157.                 dst += stride;

  1158.             }

  1159.         } else if (s->avctx->pix_fmt == AV_PIX_FMT_RGB48BE ||

  1160.                    s->avctx->pix_fmt == AV_PIX_FMT_RGBA64BE) {

  1161.             for (i = 0; i < s->height; i++) {

  1162.                 for (j = soff; j < ssize; j += 2)

  1163.                     AV_WB16(dst + j, AV_RB16(dst + j) + AV_RB16(dst + j - soff));

  1164.                 dst += stride;

  1165.             }

  1166.         } else {

  1167.             for (i = 0; i < s->height; i++) {

  1168.                 for (j = soff; j < ssize; j++)

  1169.                     dst[j] += dst[j - soff];

  1170.                 dst += stride;

  1171.             }

  1172.         }

  1173.     }

  1174. 

  1175.     if (s->invert) {

  1176.         dst = s->picture.data[0];

  1177.         for (i = 0; i < s->height; i++) {

  1178.             for (j = 0; j < s->picture.linesize[0]; j++)

  1179.                 dst[j] = (s->avctx->pix_fmt == AV_PIX_FMT_PAL8 ? (1<<s->bpp) - 1 : 255) - dst[j];

  1180.             dst += s->picture.linesize[0];

  1181.         }

  1182.     }

  1183.     *picture   = s->picture;

  1184.     *got_frame = 1;

  1185. 

  1186.     return avpkt->size;

  1187. }

  1188. 

  1189. static av_cold int tiff_init(AVCodecContext *avctx)

  1190. {

  1191.     TiffContext *s = avctx->priv_data;

  1192. 

  1193.     s->width = 0;

  1194.     s->height = 0;

  1195.     s->avctx = avctx;

  1196.     avcodec_get_frame_defaults(&s->picture);

  1197.     avctx->coded_frame = &s->picture;

  1198.     ff_lzw_decode_open(&s->lzw);

  1199.     ff_ccitt_unpack_init();

  1200. 

  1201.     return 0;

  1202. }

  1203. 

  1204. static av_cold int tiff_end(AVCodecContext *avctx)

  1205. {

  1206.     TiffContext *const s = avctx->priv_data;

  1207. 

  1208.     free_geotags(s);

  1209. 

  1210.     ff_lzw_decode_close(&s->lzw);

  1211.     av_freep(&s->deinvert_buf);

  1212.     if (s->picture.data[0])

  1213.         avctx->release_buffer(avctx, &s->picture);

  1214.     return 0;

  1215. }

  1216. 

  1217. AVCodec ff_tiff_decoder = {

  1218.     .name           = "tiff",

  1219.     .type           = AVMEDIA_TYPE_VIDEO,

  1220.     .id             = AV_CODEC_ID_TIFF,

  1221.     .priv_data_size = sizeof(TiffContext),

  1222.     .init           = tiff_init,

  1223.     .close          = tiff_end,

  1224.     .decode         = decode_frame,

  1225.     .capabilities   = CODEC_CAP_DR1,

  1226.     .long_name      = NULL_IF_CONFIG_SMALL("TIFF image"),

  1227. };