143 lines
4.3 KiB
C
143 lines
4.3 KiB
C
/*
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* Copyright (c) 2014, Mathieu Malaterre <mathieu.malaterre@voxxl.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Extract all JP2 files contained within a PDF file.
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*
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* Technically you could simply use mutool, eg:
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*
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* $ mutool show -be -o obj58.jp2 Bug691816.pdf 58
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*
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* to extract a given JP2 file from within a PDF
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* However it happens sometimes that the PDF is itself corrupted, this tools is
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* a lame PDF parser which only extract stream contained in JPXDecode box
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* only work on linux since I need memmem function
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*/
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/*
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* Add support for other signatures:
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*
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* obj<</Subtype/Image/Length 110494/Filter/JPXDecode/BitsPerComponent 8/ColorSpace/DeviceRGB/Width 712/Height 1052>>stream
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*/
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#define _GNU_SOURCE
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#include <string.h>
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#include <stdio.h>
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#include <stddef.h>
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#include <assert.h>
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int main(int argc, char *argv[])
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{
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#define NUMJP2 32
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int i, c = 0;
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long offets[NUMJP2];
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char buffer[512];
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#define BUFLEN 4096
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int cont = 1;
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FILE *f;
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size_t nread;
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char haystack[BUFLEN];
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const char needle[] = "JPXDecode";
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const size_t nlen = strlen( needle );
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const size_t flen = BUFLEN - nlen;
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char *fpos = haystack + nlen;
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const char *filename;
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if( argc < 2 ) return 1;
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filename = argv[1];
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memset( haystack, 0, nlen );
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f = fopen( filename, "rb" );
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while( cont )
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{
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const char *ret;
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size_t hlen;
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nread = fread(fpos, 1, flen, f);
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hlen = nlen + nread;
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ret = memmem( haystack, hlen, needle, nlen);
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if( ret )
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{
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const long cpos = ftell(f);
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const ptrdiff_t diff = ret - haystack;
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assert( diff >= 0 );
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/*fprintf( stdout, "Found it: %lx\n", (ptrdiff_t)cpos - (ptrdiff_t)hlen + diff);*/
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offets[c++] = (ptrdiff_t)cpos - (ptrdiff_t)hlen + diff;
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}
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cont = (nread == flen);
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memcpy( haystack, haystack + nread, nlen );
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}
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assert( feof( f ) );
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for( i = 0; i < c; ++i )
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{
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int s, len = 0;
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char *r;
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const int ret = fseek(f, offets[i], SEEK_SET);
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assert( ret == 0 );
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r = fgets(buffer, sizeof(buffer), f);
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assert( r );
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/*fprintf( stderr, "DEBUG: %s", r );*/
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s = sscanf(r, "JPXDecode]/Length %d/Width %*d/BitsPerComponent %*d/Height %*d", &len);
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if( s == 0 )
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{ // try again harder
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const int ret = fseek(f, offets[i] - 40, SEEK_SET); // 40 is magic number
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assert( ret == 0 );
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r = fgets(buffer, sizeof(buffer), f);
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assert( r );
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const char needle2[] = "/Length";
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char * s2 = strstr(buffer, needle2);
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s = sscanf(s2, "/Length %d/", &len);
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}
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if( s == 1 )
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{
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FILE *jp2;
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int j;
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char jp2fn[512];
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sprintf( jp2fn, "%s.%d.jp2", filename, i );
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jp2 = fopen( jp2fn, "wb" );
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for( j = 0; j < len; ++j )
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{
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int v = fgetc(f);
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int ret2 = fputc(v, jp2);
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assert( ret2 != EOF );
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}
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fclose( jp2 );
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#if 0
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/* TODO need to check we reached endstream */
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r = fgets(buffer, sizeof(buffer), f);
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fprintf( stderr, "DEBUG: [%s]", r );
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r = fgets(buffer, sizeof(buffer), f);
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fprintf( stderr, "DEBUG: [%s]", r );
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#endif
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}
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}
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fclose(f);
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return 0;
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}
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