/**
* Get CRC of the data in the specified archive.
* Returns 0 if file could not be opened.
*/
unsigned int CArchiveScanner::GetCRC(const std::string& arcName)
{
CRC crc;
CArchiveBase* ar;
std::list<std::string> files;
//! Try to open an archive
ar = CArchiveFactory::OpenArchive(arcName);
if (!ar) {
return 0; // It wasn't an archive
}
//! Load ignore list.
IFileFilter* ignore = CreateIgnoreFilter(ar);
for (unsigned fid = 0; fid != ar->NumFiles(); ++fid) {
std::string name;
int size;
ar->FileInfo(fid, name, size);
if (ignore->Match(name)) {
continue;
}
StringToLowerInPlace(name); //! case insensitive hash
files.push_back(name);
}
files.sort();
//! Add all files in sorted order
for (std::list<std::string>::iterator i = files.begin(); i != files.end(); ++i) {
const unsigned int nameCRC = CRC().Update(i->data(), i->size()).GetDigest();
const unsigned fid = ar->FindFile(*i);
const unsigned int dataCRC = ar->GetCrc32(fid);
crc.Update(nameCRC);
crc.Update(dataCRC);
}
delete ignore;
delete ar;
unsigned int digest = crc.GetDigest();
//! A value of 0 is used to indicate no crc.. so never return that
//! Shouldn't happen all that often
if (digest == 0) {
return 4711;
} else {
return digest;
}
}
/** Get CRC of the data in the specified archive.
Returns 0 if file could not be opened. */
unsigned int CArchiveScanner::GetCRC(const string& arcName)
{
CRC crc;
CArchiveBase* ar;
std::list<string> files;
// Try to open an archive
ar = CArchiveFactory::OpenArchive(arcName);
if (!ar) {
return 0; // It wasn't an archive
}
// Load ignore list.
IFileFilter* ignore = CreateIgnoreFilter(ar);
string name;
int size;
// Sort all file paths for deterministic behaviour
for (int cur = 0; (cur = ar->FindFiles(cur, &name, &size)); /* no-op */) {
if (ignore->Match(name)) {
continue;
}
const string lower = StringToLower(name); // case insensitive hash
files.push_back(lower);
}
files.sort();
// Add all files in sorted order
for (std::list<string>::iterator i = files.begin(); i != files.end(); i++ ) {
const unsigned int nameCRC = CRC().Update(i->data(), i->size()).GetDigest();
const unsigned int dataCRC = ar->GetCrc32(*i);
crc.Update(nameCRC);
crc.Update(dataCRC);
}
delete ignore;
delete ar;
unsigned int digest = crc.GetDigest();
// A value of 0 is used to indicate no crc.. so never return that
// Shouldn't happen all that often
if (digest == 0) {
return 4711;
} else {
return digest;
}
}