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ffmpeg / libavcodec / tiff.c @ b0c32a70

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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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/* 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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};
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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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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 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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} 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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        if(lines != s->height){
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            av_log(s->avctx, AV_LOG_ERROR, "This decoder won't decode ZLib-packed TIFF with %i lines per strip\n", lines);
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            return -1;
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        }
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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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    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++;
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                    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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                }
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            }
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            break;
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        }
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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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    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:
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        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{
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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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        s->avctx->pix_fmt = PIX_FMT_RGB24;
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        if(s->width != s->avctx->width || s->height != s->avctx->height){
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            if(avcodec_check_dimensions(s->avctx, s->width, s->height))
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                return -1;
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            avcodec_set_dimensions(s->avctx, s->width, s->height);
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        }
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        if(s->picture.data[0])
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            s->avctx->release_buffer(s->avctx, &s->picture);
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        if(s->avctx->get_buffer(s->avctx, &s->picture) < 0){
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            av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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            return -1;
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        }
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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){
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            case TIFF_BYTE:
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                s->bpp = (off & 0xFF) + ((off >> 8) & 0xFF) + ((off >> 16) & 0xFF);
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                break;
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            case TIFF_SHORT:
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            case TIFF_LONG:
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                s->bpp = tget(&buf, type, s->le) + tget(&buf, type, s->le) + tget(&buf, type, s->le);
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                break;
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            default:
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                s->bpp = -1;
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            }
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        }
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        if(s->bpp != 24){
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            av_log(s->avctx, AV_LOG_ERROR, "Only RGB24 is supported\n");
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            return -1;
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        }
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        break;
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    case TIFF_COMPR:
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        s->compr = value;
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        switch(s->compr){
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        case TIFF_RAW:
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        case TIFF_PACKBITS:
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            break;
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        case TIFF_DEFLATE:
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        case TIFF_ADOBE_DEFLATE:
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#ifdef CONFIG_ZLIB
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            break;
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#else
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            av_log(s->avctx, AV_LOG_ERROR, "Deflate: ZLib not compiled in\n");
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            return -1;
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#endif
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        case TIFF_LZW:
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            av_log(s->avctx, AV_LOG_ERROR, "LZW: not implemented yet\n");
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            return -1;
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        case TIFF_G3:
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            av_log(s->avctx, AV_LOG_ERROR, "CCITT G3 compression is not supported\n");
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            return -1;
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        case TIFF_G4:
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            av_log(s->avctx, AV_LOG_ERROR, "CCITT G4 compression is not supported\n");
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            return -1;
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        case TIFF_CCITT_RLE:
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            av_log(s->avctx, AV_LOG_ERROR, "CCITT RLE compression is not supported\n");
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            return -1;
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        default:
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            av_log(s->avctx, AV_LOG_ERROR, "Unknown compression method %i\n", s->compr);
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            return -1;
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        }
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        break;
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    case TIFF_ROWSPERSTRIP:
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        if(value < 1 || value > s->height){
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            av_log(s->avctx, AV_LOG_ERROR, "Incorrect value of rows per strip\n");
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            return -1;
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        }
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        s->rps = value;
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        break;
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    case TIFF_STRIP_OFFS:
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        if(count == 1){
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            s->stripdata = NULL;
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            s->stripoff = value;
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        }else
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            s->stripdata = start + off;
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        s->strips = count;
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        s->sot = type;
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        if(s->stripdata > 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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        break;
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    case TIFF_STRIP_SIZE:
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        if(count == 1){
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            s->stripsizes = NULL;
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            s->stripsize = value;
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            s->strips = 1;
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        }else{
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            s->stripsizes = start + off;
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        }
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        s->strips = count;
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        if(s->stripsizes > 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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        if(!pic->data[0]){
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            av_log(s->avctx, AV_LOG_ERROR, "Picture initialization missing\n");
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            return -1;
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        }
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        /* now we have the data and may start decoding */
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        stride = pic->linesize[0];
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        dst = pic->data[0];
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        for(i = 0; i < s->height; i += s->rps){
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            if(s->stripsizes)
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                ssize = tget(&s->stripsizes, type, s->le);
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            else
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                ssize = s->stripsize;
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            if(s->stripdata){
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                soff = tget(&s->stripdata, s->sot, s->le);
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            }else
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                soff = s->stripoff;
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            src = start + soff;
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            if(tiff_unpack_strip(s, dst, stride, src, ssize, FFMIN(s->rps, s->height - i)) < 0)
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                break;
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            dst += s->rps * stride;
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        }
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        break;
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    case TIFF_PREDICTOR:
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        if(!pic->data[0]){
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            av_log(s->avctx, AV_LOG_ERROR, "Picture initialization missing\n");
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            return -1;
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        }
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        if(value == 2){
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            src = pic->data[0];
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            stride = pic->linesize[0];
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            soff = s->bpp >> 3;
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            ssize = s->width * soff;
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            for(i = 0; i < s->height; i++) {
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                for(j = soff; j < ssize; j++)
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                    src[j] += src[j - soff];
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                src += stride;
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            }
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        }
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        break;
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    }
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    return 0;
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}
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static int decode_frame(AVCodecContext *avctx,
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                        void *data, int *data_size,
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                        uint8_t *buf, int buf_size)
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{
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    TiffContext * const s = avctx->priv_data;
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    AVFrame *picture = data;
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    AVFrame * const p= (AVFrame*)&s->picture;
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    uint8_t *orig_buf = buf, *end_buf = buf + buf_size;
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    int id, le, off;
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    int i, entries;
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    //parse image header
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    id = LE_16(buf); buf += 2;
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    if(id == 0x4949) le = 1;
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    else if(id == 0x4D4D) le = 0;
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    else{
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        av_log(avctx, AV_LOG_ERROR, "TIFF header not found\n");
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        return -1;
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    }
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    s->le = le;
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    // As TIFF 6.0 specification puts it "An arbitrary but carefully chosen number
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    // that further identifies the file as a TIFF file"
375
    if(tget_short(&buf, le) != 42){
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        av_log(avctx, AV_LOG_ERROR, "The answer to life, universe and everything is not correct!\n");
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        return -1;
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    }
379
    /* parse image file directory */
380
    off = tget_long(&buf, le);
381
    if(orig_buf + off + 14 >= end_buf){
382
        av_log(avctx, AV_LOG_ERROR, "IFD offset is greater than image size\n");
383
        return -1;
384
    }
385
    buf = orig_buf + off;
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    entries = tget_short(&buf, le);
387
    for(i = 0; i < entries; i++){
388
        if(tiff_decode_tag(s, orig_buf, buf, end_buf, p) < 0)
389
            return -1;
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        buf += 12;
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    }
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    *picture= *(AVFrame*)&s->picture;
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    *data_size = sizeof(AVPicture);
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396
    return buf_size;
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}
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399
static int tiff_init(AVCodecContext *avctx){
400
    TiffContext *s = avctx->priv_data;
401

    
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    s->width = 0;
403
    s->height = 0;
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    s->avctx = avctx;
405
    avcodec_get_frame_defaults((AVFrame*)&s->picture);
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    avctx->coded_frame= (AVFrame*)&s->picture;
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    s->picture.data[0] = NULL;
408

    
409
    return 0;
410
}
411

    
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static int tiff_end(AVCodecContext *avctx)
413
{
414
    TiffContext * const s = avctx->priv_data;
415

    
416
    if(s->picture.data[0])
417
        avctx->release_buffer(avctx, &s->picture);
418
    return 0;
419
}
420

    
421
AVCodec tiff_decoder = {
422
    "tiff",
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    CODEC_TYPE_VIDEO,
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    CODEC_ID_TIFF,
425
    sizeof(TiffContext),
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    tiff_init,
427
    NULL,
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    tiff_end,
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    decode_frame,
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    0,
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    NULL
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};