FILE *
FileCache::Save(const TCHAR *name, const TCHAR *original_path)
{
FileInfo original_info;
if (!GetRegularFileInfo(original_path, original_info))
return NULL;
Directory::Create(cache_path);
TCHAR path[PathBufferSize(name)];
MakeCachePath(path, name);
File::Delete(path);
FILE *file = _tfopen(path, _T("wb"));
if (file == NULL)
return NULL;
if (fwrite(&FILE_CACHE_MAGIC, sizeof(FILE_CACHE_MAGIC), 1, file) != 1 ||
fwrite(&original_info, sizeof(original_info), 1, file) != 1) {
fclose(file);
File::Delete(path);
return NULL;
}
return file;
}
FILE *
FileCache::Save(const TCHAR *name, Path original_path)
{
FileInfo original_info;
if (!GetRegularFileInfo(original_path, original_info))
return nullptr;
Directory::Create(cache_path);
const auto path = MakeCachePath(name);
File::Delete(path);
FILE *file = _tfopen(path.c_str(), _T("wb"));
if (file == nullptr)
return nullptr;
if (fwrite(&FILE_CACHE_MAGIC, sizeof(FILE_CACHE_MAGIC), 1, file) != 1 ||
fwrite(&original_info, sizeof(original_info), 1, file) != 1) {
fclose(file);
File::Delete(path);
return nullptr;
}
return file;
}
FILE *
FileCache::Load(const TCHAR *name, const TCHAR *original_path)
{
FileInfo original_info;
if (!GetRegularFileInfo(original_path, original_info))
return NULL;
TCHAR path[PathBufferSize(name)];
MakeCachePath(path, name);
FileInfo cached_info;
if (!GetRegularFileInfo(path, cached_info))
return NULL;
/* if the original file is newer than the cache, discard the cache -
unless the system clock is skewed (origina file's modification
time is in the future) */
if (original_info.mtime > cached_info.mtime && !original_info.IsFuture()) {
File::Delete(path);
return NULL;
}
FILE *file = _tfopen(path, _T("rb"));
if (file == NULL)
return NULL;
unsigned magic;
struct FileInfo old_info;
if (fread(&magic, sizeof(magic), 1, file) != 1 ||
magic != FILE_CACHE_MAGIC ||
fread(&old_info, sizeof(old_info), 1, file) != 1 ||
old_info != original_info) {
fclose(file);
File::Delete(path);
return NULL;
}
return file;
}
