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ffmpeg / libavcodec / tiff.c @ b39cf84c

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/*
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 * TIFF image decoder
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 * Copyright (c) 2006 Konstantin Shishkov
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 *
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 */
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#include "avcodec.h"
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#ifdef CONFIG_ZLIB
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#include <zlib.h>
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#endif
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#include "lzw.h"
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/* abridged list of TIFF tags */
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enum TiffTags{
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    TIFF_WIDTH = 0x100,
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    TIFF_HEIGHT,
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    TIFF_BPP,
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    TIFF_COMPR,
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    TIFF_INVERT = 0x106,
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    TIFF_STRIP_OFFS = 0x111,
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    TIFF_ROWSPERSTRIP = 0x116,
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    TIFF_STRIP_SIZE,
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    TIFF_XPOS = 0x11E,
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    TIFF_YPOS = 0x11F,
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    TIFF_PREDICTOR = 0x13D,
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    TIFF_PAL = 0x140
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};
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enum TiffCompr{
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    TIFF_RAW = 1,
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    TIFF_CCITT_RLE,
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    TIFF_G3,
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    TIFF_G4,
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    TIFF_LZW,
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    TIFF_JPEG,
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    TIFF_NEWJPEG,
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    TIFF_ADOBE_DEFLATE,
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    TIFF_PACKBITS = 0x8005,
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    TIFF_DEFLATE = 0x80B2
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};
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enum TiffTypes{
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    TIFF_BYTE = 1,
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    TIFF_STRING,
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    TIFF_SHORT,
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    TIFF_LONG,
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    TIFF_LONGLONG
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};
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/** sizes of various TIFF field types */
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static const int type_sizes[6] = {
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    0, 1, 100, 2, 4, 8
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};
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typedef struct TiffContext {
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    AVCodecContext *avctx;
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    AVFrame picture;
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    int width, height;
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    unsigned int bpp;
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    int le;
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    int compr;
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    int invert;
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    int strips, rps;
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    int sot;
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    uint8_t* stripdata;
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    uint8_t* stripsizes;
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    int stripsize, stripoff;
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    LZWState *lzw;
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} TiffContext;
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static int tget_short(uint8_t **p, int le){
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    int v = le ? LE_16(*p) : BE_16(*p);
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    *p += 2;
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    return v;
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}
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static int tget_long(uint8_t **p, int le){
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    int v = le ? LE_32(*p) : BE_32(*p);
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    *p += 4;
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    return v;
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}
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static int tget(uint8_t **p, int type, int le){
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    switch(type){
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    case TIFF_BYTE : return *(*p)++;
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    case TIFF_SHORT: return tget_short(p, le);
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    case TIFF_LONG : return tget_long (p, le);
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    default        : return -1;
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    }
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}
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static int tiff_unpack_strip(TiffContext *s, uint8_t* dst, int stride, uint8_t *src, int size, int lines){
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    int c, line, pixels, code;
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    uint8_t *ssrc = src;
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    int width = s->width * (s->bpp / 8);
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#ifdef CONFIG_ZLIB
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    uint8_t *zbuf; unsigned long outlen;
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    if(s->compr == TIFF_DEFLATE || s->compr == TIFF_ADOBE_DEFLATE){
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        outlen = width * lines;
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        zbuf = av_malloc(outlen);
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        if(uncompress(zbuf, &outlen, src, size) != Z_OK){
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            av_log(s->avctx, AV_LOG_ERROR, "Uncompressing failed (%lu of %lu)\n", outlen, (unsigned long)width * lines);
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            av_free(zbuf);
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            return -1;
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        }
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        src = zbuf;
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        for(line = 0; line < lines; line++){
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            memcpy(dst, src, width);
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            dst += stride;
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            src += width;
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        }
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        av_free(zbuf);
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        return 0;
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    }
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#endif
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    if(s->compr == TIFF_LZW){
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        if(ff_lzw_decode_init(s->lzw, 8, src, size, FF_LZW_TIFF) < 0){
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            av_log(s->avctx, AV_LOG_ERROR, "Error initializing LZW decoder\n");
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            return -1;
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        }
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    }
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    for(line = 0; line < lines; line++){
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        if(src - ssrc > size){
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            av_log(s->avctx, AV_LOG_ERROR, "Source data overread\n");
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            return -1;
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        }
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        switch(s->compr){
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        case TIFF_RAW:
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            memcpy(dst, src, s->width * (s->bpp / 8));
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            src += s->width * (s->bpp / 8);
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            break;
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        case TIFF_PACKBITS:
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            for(pixels = 0; pixels < width;){
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                code = (int8_t)*src++;
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                if(code >= 0){
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                    code++;
155
                    if(pixels + code > width){
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                        av_log(s->avctx, AV_LOG_ERROR, "Copy went out of bounds\n");
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                        return -1;
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                    }
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                    memcpy(dst + pixels, src, code);
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                    src += code;
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                    pixels += code;
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                }else if(code != -128){ // -127..-1
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                    code = (-code) + 1;
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                    if(pixels + code > width){
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                        av_log(s->avctx, AV_LOG_ERROR, "Run went out of bounds\n");
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                        return -1;
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                    }
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                    c = *src++;
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                    memset(dst + pixels, c, code);
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                    pixels += code;
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                }
172
            }
173
            break;
174
        case TIFF_LZW:
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            pixels = ff_lzw_decode(s->lzw, dst, width);
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            if(pixels < width){
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                av_log(s->avctx, AV_LOG_ERROR, "Decoded only %i bytes of %i\n", pixels, width);
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                return -1;
179
            }
180
            break;
181
        }
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        dst += stride;
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    }
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    return 0;
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}
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static int tiff_decode_tag(TiffContext *s, uint8_t *start, uint8_t *buf, uint8_t *end_buf, AVFrame *pic)
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{
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    int tag, type, count, off, value = 0;
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    uint8_t *src, *dst;
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    int i, j, ssize, soff, stride;
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    int *pal, *rp, *gp, *bp;
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    tag = tget_short(&buf, s->le);
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    type = tget_short(&buf, s->le);
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    count = tget_long(&buf, s->le);
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    off = tget_long(&buf, s->le);
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    if(count == 1){
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        switch(type){
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        case TIFF_BYTE:
203
        case TIFF_SHORT:
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            buf -= 4;
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            value = tget(&buf, type, s->le);
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            buf = NULL;
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            break;
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        case TIFF_LONG:
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            value = off;
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            buf = NULL;
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            break;
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        default:
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            value = -1;
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            buf = start + off;
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        }
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    }else if(type_sizes[type] * count <= 4){
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        buf -= 4;
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    }else{
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        buf = start + off;
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    }
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    if(buf && (buf < start || buf > end_buf)){
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        av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
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        return -1;
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    }
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    switch(tag){
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    case TIFF_WIDTH:
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        s->width = value;
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        break;
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    case TIFF_HEIGHT:
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        s->height = value;
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        break;
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    case TIFF_BPP:
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        if(count == 1) s->bpp = value;
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        else{
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            switch(type){
238
            case TIFF_BYTE:
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                s->bpp = (off & 0xFF) + ((off >> 8) & 0xFF) + ((off >> 16) & 0xFF) + ((off >> 24) & 0xFF);
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                break;
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            case TIFF_SHORT:
242
            case TIFF_LONG:
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                s->bpp = 0;
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                for(i = 0; i < count; i++) s->bpp += tget(&buf, type, s->le);
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                break;
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            default:
247
                s->bpp = -1;
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            }
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        }
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        switch(s->bpp){
251
        case 8:
252
            s->avctx->pix_fmt = PIX_FMT_PAL8;
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            break;
254
        case 24:
255
            s->avctx->pix_fmt = PIX_FMT_RGB24;
256
            break;
257
        default:
258
            av_log(s->avctx, AV_LOG_ERROR, "This format is not supported (bpp=%i)\n", s->bpp);
259
            return -1;
260
        }
261
        if(s->width != s->avctx->width || s->height != s->avctx->height){
262
            if(avcodec_check_dimensions(s->avctx, s->width, s->height))
263
                return -1;
264
            avcodec_set_dimensions(s->avctx, s->width, s->height);
265
        }
266
        if(s->picture.data[0])
267
            s->avctx->release_buffer(s->avctx, &s->picture);
268
        if(s->avctx->get_buffer(s->avctx, &s->picture) < 0){
269
            av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
270
            return -1;
271
        }
272
        if(s->bpp == 8){
273
            /* make default grayscale pal */
274
            pal = s->picture.data[1];
275
            for(i = 0; i < 256; i++)
276
                pal[i] = i * 0x010101;
277
        }
278
        break;
279
    case TIFF_COMPR:
280
        s->compr = value;
281
        switch(s->compr){
282
        case TIFF_RAW:
283
        case TIFF_PACKBITS:
284
        case TIFF_LZW:
285
            break;
286
        case TIFF_DEFLATE:
287
        case TIFF_ADOBE_DEFLATE:
288
#ifdef CONFIG_ZLIB
289
            break;
290
#else
291
            av_log(s->avctx, AV_LOG_ERROR, "Deflate: ZLib not compiled in\n");
292
            return -1;
293
#endif
294
        case TIFF_G3:
295
            av_log(s->avctx, AV_LOG_ERROR, "CCITT G3 compression is not supported\n");
296
            return -1;
297
        case TIFF_G4:
298
            av_log(s->avctx, AV_LOG_ERROR, "CCITT G4 compression is not supported\n");
299
            return -1;
300
        case TIFF_CCITT_RLE:
301
            av_log(s->avctx, AV_LOG_ERROR, "CCITT RLE compression is not supported\n");
302
            return -1;
303
        case TIFF_JPEG:
304
        case TIFF_NEWJPEG:
305
            av_log(s->avctx, AV_LOG_ERROR, "JPEG compression is not supported\n");
306
            return -1;
307
        default:
308
            av_log(s->avctx, AV_LOG_ERROR, "Unknown compression method %i\n", s->compr);
309
            return -1;
310
        }
311
        break;
312
    case TIFF_ROWSPERSTRIP:
313
        if(value < 1){
314
            av_log(s->avctx, AV_LOG_ERROR, "Incorrect value of rows per strip\n");
315
            return -1;
316
        }
317
        s->rps = value;
318
        break;
319
    case TIFF_STRIP_OFFS:
320
        if(count == 1){
321
            s->stripdata = NULL;
322
            s->stripoff = value;
323
        }else
324
            s->stripdata = start + off;
325
        s->strips = count;
326
        s->sot = type;
327
        if(s->stripdata > end_buf){
328
            av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
329
            return -1;
330
        }
331
        break;
332
    case TIFF_STRIP_SIZE:
333
        if(count == 1){
334
            s->stripsizes = NULL;
335
            s->stripsize = value;
336
            s->strips = 1;
337
        }else{
338
            s->stripsizes = start + off;
339
        }
340
        s->strips = count;
341
        if(s->stripsizes > end_buf){
342
            av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
343
            return -1;
344
        }
345
        if(!pic->data[0]){
346
            av_log(s->avctx, AV_LOG_ERROR, "Picture initialization missing\n");
347
            return -1;
348
        }
349
        /* now we have the data and may start decoding */
350
        stride = pic->linesize[0];
351
        dst = pic->data[0];
352
        for(i = 0; i < s->height; i += s->rps){
353
            if(s->stripsizes)
354
                ssize = tget(&s->stripsizes, type, s->le);
355
            else
356
                ssize = s->stripsize;
357

    
358
            if(s->stripdata){
359
                soff = tget(&s->stripdata, s->sot, s->le);
360
            }else
361
                soff = s->stripoff;
362
            src = start + soff;
363
            if(tiff_unpack_strip(s, dst, stride, src, ssize, FFMIN(s->rps, s->height - i)) < 0)
364
                break;
365
            dst += s->rps * stride;
366
        }
367
        break;
368
    case TIFF_PREDICTOR:
369
        if(!pic->data[0]){
370
            av_log(s->avctx, AV_LOG_ERROR, "Picture initialization missing\n");
371
            return -1;
372
        }
373
        if(value == 2){
374
            src = pic->data[0];
375
            stride = pic->linesize[0];
376
            soff = s->bpp >> 3;
377
            ssize = s->width * soff;
378
            for(i = 0; i < s->height; i++) {
379
                for(j = soff; j < ssize; j++)
380
                    src[j] += src[j - soff];
381
                src += stride;
382
            }
383
        }
384
        break;
385
    case TIFF_INVERT:
386
        switch(value){
387
        case 0:
388
            s->invert = 1;
389
            break;
390
        case 1:
391
            s->invert = 0;
392
            break;
393
        case 2:
394
        case 3:
395
            break;
396
        default:
397
            av_log(s->avctx, AV_LOG_ERROR, "Color mode %d is not supported\n", value);
398
            return -1;
399
        }
400
        break;
401
    case TIFF_PAL:
402
        if(s->avctx->pix_fmt != PIX_FMT_PAL8){
403
            av_log(s->avctx, AV_LOG_ERROR, "Palette met but this is not palettized format\n");
404
            return -1;
405
        }
406
        pal = s->picture.data[1];
407
        off = type_sizes[type];
408
        rp = buf;
409
        gp = buf + count / 3 * off;
410
        bp = buf + count / 3 * off * 2;
411
        off = (type_sizes[type] - 1) << 3;
412
        for(i = 0; i < count / 3; i++){
413
            j = (tget(&rp, type, s->le) >> off) << 16;
414
            j |= (tget(&gp, type, s->le) >> off) << 8;
415
            j |= tget(&bp, type, s->le) >> off;
416
            pal[i] = j;
417
        }
418
    }
419
    return 0;
420
}
421

    
422
static int decode_frame(AVCodecContext *avctx,
423
                        void *data, int *data_size,
424
                        uint8_t *buf, int buf_size)
425
{
426
    TiffContext * const s = avctx->priv_data;
427
    AVFrame *picture = data;
428
    AVFrame * const p= (AVFrame*)&s->picture;
429
    uint8_t *orig_buf = buf, *end_buf = buf + buf_size;
430
    int id, le, off;
431
    int i, entries;
432

    
433
    //parse image header
434
    id = LE_16(buf); buf += 2;
435
    if(id == 0x4949) le = 1;
436
    else if(id == 0x4D4D) le = 0;
437
    else{
438
        av_log(avctx, AV_LOG_ERROR, "TIFF header not found\n");
439
        return -1;
440
    }
441
    s->le = le;
442
    s->invert = 0;
443
    // As TIFF 6.0 specification puts it "An arbitrary but carefully chosen number
444
    // that further identifies the file as a TIFF file"
445
    if(tget_short(&buf, le) != 42){
446
        av_log(avctx, AV_LOG_ERROR, "The answer to life, universe and everything is not correct!\n");
447
        return -1;
448
    }
449
    /* parse image file directory */
450
    off = tget_long(&buf, le);
451
    if(orig_buf + off + 14 >= end_buf){
452
        av_log(avctx, AV_LOG_ERROR, "IFD offset is greater than image size\n");
453
        return -1;
454
    }
455
    buf = orig_buf + off;
456
    entries = tget_short(&buf, le);
457
    for(i = 0; i < entries; i++){
458
        if(tiff_decode_tag(s, orig_buf, buf, end_buf, p) < 0)
459
            return -1;
460
        buf += 12;
461
    }
462

    
463
    if(s->invert){
464
        uint8_t *src;
465
        int j;
466

    
467
        src = s->picture.data[0];
468
        for(j = 0; j < s->height; j++){
469
            for(i = 0; i < s->picture.linesize[0]; i++)
470
                src[i] = 255 - src[i];
471
            src += s->picture.linesize[0];
472
        }
473
    }
474
    *picture= *(AVFrame*)&s->picture;
475
    *data_size = sizeof(AVPicture);
476

    
477
    return buf_size;
478
}
479

    
480
static int tiff_init(AVCodecContext *avctx){
481
    TiffContext *s = avctx->priv_data;
482

    
483
    s->width = 0;
484
    s->height = 0;
485
    s->avctx = avctx;
486
    avcodec_get_frame_defaults((AVFrame*)&s->picture);
487
    avctx->coded_frame= (AVFrame*)&s->picture;
488
    s->picture.data[0] = NULL;
489
    ff_lzw_decode_open(&s->lzw);
490

    
491
    return 0;
492
}
493

    
494
static int tiff_end(AVCodecContext *avctx)
495
{
496
    TiffContext * const s = avctx->priv_data;
497

    
498
    ff_lzw_decode_close(&s->lzw);
499
    if(s->picture.data[0])
500
        avctx->release_buffer(avctx, &s->picture);
501
    return 0;
502
}
503

    
504
AVCodec tiff_decoder = {
505
    "tiff",
506
    CODEC_TYPE_VIDEO,
507
    CODEC_ID_TIFF,
508
    sizeof(TiffContext),
509
    tiff_init,
510
    NULL,
511
    tiff_end,
512
    decode_frame,
513
    0,
514
    NULL
515
};