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panorepack.c
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panorepack.c
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#include "stupidvalve.h"
#include "crc32.h"
#include <stdio.h>
int main(int argc, char** argv) {
if(argc < 4) {
fprintf(stderr,"Usage: ./panorepack oldfile newcontents outputfile\n");
exit(1);
}
filedata* fd = loadfile(argv[1]);
if(fd->filetype != SVF) {
fprintf(stderr,"Error: oldfile must be valid SVF file\n");
exit(4);
}
char* newcontents;
uint64_t newlen = readintobuf(argv[2], &newcontents);
svffile_generic* ret = fd->parsed;
// find the data lump header
uint32_t i;
for(i=0;i<ret->hdr->lumps.count;i++) {
if(strncmp(ret->lumpheaders[i].tag,"DATA",4)==0) {
break;
}
}
if(i==ret->hdr->lumps.count) {
fprintf(stderr,"Error: No DATA lump found in input file!\n");
exit(8);
}
uint64_t headerlen = fd->length - ret->lumpheaders[i].length;
uint64_t newtotallen = headerlen + newlen + 6;
char* newbuff = (char*)calloc(sizeof(char),newtotallen);
ret->lumpheaders[i].length = newlen + 6;
memcpy(newbuff, fd->contents, headerlen);
memcpy(newbuff+headerlen+6, newcontents, newlen);
*(uint32_t*)(newbuff + headerlen) = crc32(0,newcontents, newlen);
*(uint32_t*)newbuff = newtotallen;
FILE* of = fopen(argv[3],"w");
if(of == NULL) {
fprintf(stderr,"Error: Unable to open output file %s for writing!\n",argv[3]);
exit(16);
}
fwrite(newbuff, sizeof(char), newtotallen, of);
fclose(of);
free(newbuff);
free(newcontents);
fd_free(fd);
}