/**
* Calculate the MD5 sum for a GRF, and store it in the config.
* @param config GRF to compute.
* @param subdir The subdirectory to look in.
* @return MD5 sum was successfully computed
*/
static bool CalcGRFMD5Sum(GRFConfig *config, Subdirectory subdir)
{
FILE *f;
Md5 checksum;
uint8 buffer[1024];
size_t len, size;
/* open the file */
f = FioFOpenFile(config->filename, "rb", subdir, &size);
if (f == NULL) return false;
long start = ftell(f);
size = min(size, GRFGetSizeOfDataSection(f));
if (start < 0 || fseek(f, start, SEEK_SET) < 0) {
FioFCloseFile(f);
return false;
}
/* calculate md5sum */
while ((len = fread(buffer, 1, (size > sizeof(buffer)) ? sizeof(buffer) : size, f)) != 0 && size != 0) {
size -= len;
checksum.Append(buffer, len);
}
checksum.Finish(config->ident.md5sum);
FioFCloseFile(f);
return true;
}
/* Add the file and calculate the md5 sum. */
virtual bool AddFile(const char *filename, size_t basepath_length, const char *tar_filename)
{
Md5 checksum;
uint8 buffer[1024];
size_t len, size;
byte tmp_md5sum[16];
/* Open the file ... */
FILE *f = FioFOpenFile(filename, "rb", this->dir, &size);
if (f == NULL) return false;
/* ... calculate md5sum... */
while ((len = fread(buffer, 1, (size > sizeof(buffer)) ? sizeof(buffer) : size, f)) != 0 && size != 0) {
size -= len;
checksum.Append(buffer, len);
}
checksum.Finish(tmp_md5sum);
FioFCloseFile(f);
/* ... and xor it to the overall md5sum. */
for (uint i = 0; i < sizeof(md5sum); i++) this->md5sum[i] ^= tmp_md5sum[i];
return true;
}
/**
* Calculate and check the MD5 hash of the supplied filename.
* @param subdir The sub directory to get the files from
* @return
* - #CR_MATCH if the MD5 hash matches
* - #CR_MISMATCH if the MD5 does not match
* - #CR_NO_FILE if the file misses
*/
MD5File::ChecksumResult MD5File::CheckMD5(Subdirectory subdir) const
{
size_t size;
FILE *f = FioFOpenFile(this->filename, "rb", subdir, &size);
if (f == NULL) return CR_NO_FILE;
Md5 checksum;
uint8 buffer[1024];
uint8 digest[16];
size_t len;
while ((len = fread(buffer, 1, (size > sizeof(buffer)) ? sizeof(buffer) : size, f)) != 0 && size != 0) {
size -= len;
checksum.Append(buffer, len);
}
FioFCloseFile(f);
checksum.Finish(digest);
return memcmp(this->hash, digest, sizeof(this->hash)) == 0 ? CR_MATCH : CR_MISMATCH;
}
/**
* Calculate the MD5 sum for a GRF, and store it in the config.
* @param config GRF to compute.
* @return MD5 sum was successfully computed
*/
static bool CalcGRFMD5Sum(GRFConfig *config)
{
FILE *f;
Md5 checksum;
uint8 buffer[1024];
size_t len, size;
/* open the file */
f = FioFOpenFile(config->filename, "rb", DATA_DIR, &size);
if (f == NULL) return false;
/* calculate md5sum */
while ((len = fread(buffer, 1, (size > sizeof(buffer)) ? sizeof(buffer) : size, f)) != 0 && size != 0) {
size -= len;
checksum.Append(buffer, len);
}
checksum.Finish(config->ident.md5sum);
FioFCloseFile(f);
return true;
}