size_t CachingFileLoader::ReadAt(s64 absolutePos, size_t bytes, void *data, Flags flags) {
Prepare();
if (absolutePos >= filesize_) {
bytes = 0;
} else if (absolutePos + (s64)bytes >= filesize_) {
bytes = (size_t)(filesize_ - absolutePos);
}
size_t readSize = 0;
if ((flags & Flags::HINT_UNCACHED) != 0) {
readSize = backend_->ReadAt(absolutePos, bytes, data, flags);
} else {
readSize = ReadFromCache(absolutePos, bytes, data);
// While in case the cache size is too small for the entire read.
while (readSize < bytes) {
SaveIntoCache(absolutePos + readSize, bytes - readSize, flags);
size_t bytesFromCache = ReadFromCache(absolutePos + readSize, bytes - readSize, (u8 *)data + readSize);
readSize += bytesFromCache;
if (bytesFromCache == 0) {
// We can't read any more.
break;
}
}
StartReadAhead(absolutePos + readSize);
}
return readSize;
}
size_t CachingFileLoader::ReadAt(s64 absolutePos, size_t bytes, void *data) {
size_t readSize = ReadFromCache(absolutePos, bytes, data);
// While in case the cache size is too small for the entire read.
while (readSize < bytes) {
SaveIntoCache(absolutePos + readSize, bytes - readSize);
readSize += ReadFromCache(absolutePos + readSize, bytes - readSize, (u8 *)data + readSize);
}
StartReadAhead(absolutePos + readSize);
filepos_ = absolutePos + readSize;
return readSize;
}
size_t RamCachingFileLoader::ReadAt(s64 absolutePos, size_t bytes, void *data) {
size_t readSize = 0;
if (cache_ == nullptr) {
lock_guard guard(backendMutex_);
readSize = backend_->ReadAt(absolutePos, bytes, data);
} else {
readSize = ReadFromCache(absolutePos, bytes, data);
// While in case the cache size is too small for the entire read.
while (readSize < bytes) {
SaveIntoCache(absolutePos + readSize, bytes - readSize);
readSize += ReadFromCache(absolutePos + readSize, bytes - readSize, (u8 *)data + readSize);
}
}
StartReadAhead(absolutePos + readSize);
filepos_ = absolutePos + readSize;
return readSize;
}
size_t RamCachingFileLoader::ReadAt(s64 absolutePos, size_t bytes, void *data, Flags flags) {
size_t readSize = 0;
if (cache_ == nullptr || (flags & Flags::HINT_UNCACHED) != 0) {
lock_guard guard(backendMutex_);
readSize = backend_->ReadAt(absolutePos, bytes, data, flags);
} else {
readSize = ReadFromCache(absolutePos, bytes, data);
// While in case the cache size is too small for the entire read.
while (readSize < bytes) {
SaveIntoCache(absolutePos + readSize, bytes - readSize, flags);
size_t bytesFromCache = ReadFromCache(absolutePos + readSize, bytes - readSize, (u8 *)data + readSize);
readSize += bytesFromCache;
if (bytesFromCache == 0) {
// We can't read any more.
break;
}
}
StartReadAhead(absolutePos + readSize);
}
filepos_ = absolutePos + readSize;
return readSize;
}