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/* Prism Versioning
* Copyright 2014 Jeffrey Armstrong <jeff@rainbow-100.com>
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <io.h>
#include "prism.h"
#include "md5.h"
#include "rfile.h"
#include "compress.h"
#include "fcomp.h"
static const char hex_str[]= "0123456789abcdef";
int get_archive_name(char *filename, int maxfile, int id, int revision)
{
if(filename == NULL)
return PRET_ERROR;
snprintf(filename, maxfile, "%s%s%x.%x", PDB_DIR, DIR_SEP, id, revision);
return strlen(filename);
}
int get_file_hash(const char *filename, char *hash)
{
FILE *fp;
MD5_CTX hb;
char buf[16];
int i;
if(filename == NULL || hash == NULL)
return PRET_ERROR;
fp = fopen(filename, "rb");
if(fp == NULL)
return PRET_READERROR;
MD5_Init(&hb);
while((i = fread(buf, sizeof(char), 15, fp)) > 0) {
MD5_Update(&hb, buf, i);
}
fclose(fp);
MD5_Final(buf, &hb);
for(i=0; i<16; i++) {
hash[2*i] = hex_str[buf[i] >> 4];
hash[2*i+1] = hex_str[buf[i] & 0x0F];
}
return PRET_OK;
}
int compress_file(const char *filename, int id, int revision)
{
char *newfile;
/* Arbitrary size... */
newfile = (char *)malloc(128*sizeof(char));
if(newfile == NULL)
return PRET_ERROR;
get_archive_name(newfile, 128, id, revision);
if(file_compress(filename, newfile) >= 0)
return PRET_OK;
return PRET_GZFAILED;
}
int decompress_file(const char *destination, int id, int revision)
{
char *stored_name;
/* Arbitrary size... */
stored_name = (char *)malloc(128*sizeof(char));
if(stored_name == NULL)
return PRET_ERROR;
get_archive_name(stored_name, 128, id, revision);
unlink(destination);
if(file_uncompress(stored_name, destination) >= 0)
return PRET_OK;
return PRET_GZFAILED;
}
int diff_file(const char *working, int id, int revision)
{
int res;
int namelength;
char *rev_name;
char *extension;
if(working == NULL) return PRET_ERROR;
namelength = strlen(working)+strlen(PDB_DIR)+strlen(DIR_SEP)+16;
rev_name = (char *)malloc(namelength*sizeof(char));
if(rev_name == NULL)
return PRET_ERROR;
snprintf(rev_name, namelength, "%s%s%s", PDB_DIR, DIR_SEP, working);
extension = strrchr(rev_name, '.');
if(extension != NULL) extension[0] = '\0';
#if defined(MSDOS) || defined(WIN32)
snprintf(rev_name, namelength, "%s.%.3x", rev_name, revision);
#else
snprintf(rev_name, namelength, "%s.%x", rev_name, revision);
#endif
/* Decompress the archived version to a temporary file */
res = decompress_file(rev_name, id, revision);
if(res != PRET_OK) {
free(rev_name);
return res;
}
/* Perform the comparison */
res = compare_files(rev_name, working);
unlink(rev_name);
free(rev_name);
return res;
}
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