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@yne yne/bin_extract.c
Created Dec 20, 2015

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Extract from a blob using file header
#include <stdio.h>
#include <string.h>
char* headers[]={
"ID3",
"GIF89",
"‰PNG",
"OggS",
"ÿØÿà",
"BM6x",
"DDS ",
"<?xm",
};
char* ext[]={
"mp3",
"gif",
"png",
"ogg",
"jpg",
"bmp",
"dds",
"xml"
};
int dump(char* from,char*to,size_t start,size_t end){
printf("dump %08x ~ %08x to %s\n",start,end,to);
FILE*src=fopen(from,"rb");
FILE*dst=fopen(to,"wb+");
char buf[4];
size_t pos;
fseek(src,start,SEEK_SET);
for(pos=0;pos<end-start;pos+=4){
fread (buf,4,1,src);
fwrite(buf,4,1,dst);
}
fclose(src);
fclose(dst);
}
int main(int argc,char**argv){
FILE*last=NULL,*f=fopen(argv[1],"rb");
char data[4],fname[8+4+1]="00000000.bin";
unsigned j,i,lastpos=0;
for(j=0;fread(&data,4,1,f)>0;j+=4){
for(i=0;i<sizeof(headers)/4;i++){
if(memcmp(headers[i],data,4))continue;
dump(argv[1],fname,lastpos,j);
sprintf(fname,"%08X.%s",j,ext[i]);
lastpos=j;
}
}
fclose(f);
return 0;
}
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