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#include <stdio.h>
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#include <string>
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int main(int argc, char ** argv)
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{
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if (argc!=5)
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{
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fprintf(stderr,"Expected pattern_file,pattern_offset,pattern_len,match_file\n");
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return -1;
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}
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std::string pattern = argv[1];
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int offset = atoi(argv[2]);
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size_t len = atoi(argv[3]);
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std::string find_in_here = argv[4];
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FILE * p = fopen(pattern.c_str(),"rb");
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if (!p)
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{
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fprintf(stderr,"Unable to open %s\n",pattern.c_str());
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return -1;
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}
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fseek(p,offset,SEEK_SET);
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unsigned char * data = (unsigned char *)malloc(len);
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if (fread(data,1,len,p)!=len)
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{
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fprintf(stderr,"Unable to read pattern\n");
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return -1;
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}
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fclose(p);
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FILE * f = fopen(find_in_here.c_str(),"rb");
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if (!f)
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{
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fprintf(stderr,"Unable to open %s\n",find_in_here.c_str());
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return -1;
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}
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int file_offset = 0;
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unsigned char * match = (unsigned char *)malloc(len);
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bool found = false;
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while (!found)
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{
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fseek(f,file_offset,SEEK_SET);
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if (fread(match,1,len,f) !=len)
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break;
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found = true;
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for (size_t i=0;i!=len;++i)
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{
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//printf("%d:%d:%02x %02x\n",file_offset,i,match[i],data[i]);
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if (match[i]!=data[i])
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{
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found = false;
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break;
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}
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}
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if (found)
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{
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printf("%08x",file_offset);
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break;
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}
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++file_offset;
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}
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fclose(f);
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free(match);
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free(data);
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if (found)
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return 0;
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else
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return -1;
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}
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