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#include "StarMemoryAssetSource.hpp"
#include "StarDataStreamDevices.hpp"
#include "StarDataStreamExtra.hpp"
#include "StarSha256.hpp"
namespace Star {
MemoryAssetSource::MemoryAssetSource(JsonObject metadata) : m_metadata(metadata) {}
JsonObject MemoryAssetSource::metadata() const {
return m_metadata;
}
StringList MemoryAssetSource::assetPaths() const {
return m_files.keys();
}
IODevicePtr MemoryAssetSource::open(String const& path) {
struct AssetReader : public IODevice {
AssetReader(ByteArrayPtr assetData, String name) : assetData(assetData), name(name) { setMode(IOMode::Read); }
size_t read(char* data, size_t len) override {
len = min<StreamOffset>(len, StreamOffset(assetData->size()) - assetPos);
assetData->copyTo(data, len);
return len;
}
size_t write(char const*, size_t) override {
throw IOException("Assets IODevices are read-only");
}
StreamOffset size() override { return assetData->size(); }
StreamOffset pos() override { return assetPos; }
String deviceName() const override { return name; }
bool atEnd() override {
return assetPos >= assetData->size();
}
void seek(StreamOffset p, IOSeek mode) override {
if (mode == IOSeek::Absolute)
assetPos = p;
else if (mode == IOSeek::Relative)
assetPos = clamp<StreamOffset>(assetPos + p, 0, assetData->size());
else
assetPos = clamp<StreamOffset>(assetPos - p, 0, assetData->size());
}
ByteArrayPtr assetData;
StreamOffset assetPos;
String name;
};
auto p = m_files.ptr(path);
if (!p)
throw AssetSourceException::format("Requested file '{}' does not exist in memory", path);
return make_shared<AssetReader>(*p, path);
}
bool MemoryAssetSource::empty() const {
return m_files.empty();
}
bool MemoryAssetSource::contains(String const& path) const {
return m_files.contains(path);
}
bool MemoryAssetSource::erase(String const& path) {
return m_files.erase(path) != 0;
}
bool MemoryAssetSource::set(String const& path, ByteArray data) {
return m_files.emplace(path, make_shared<ByteArray>(std::move(data))).second;
}
ByteArray MemoryAssetSource::read(String const& path) {
auto p = m_files.ptr(path);
if (!p)
throw AssetSourceException::format("Requested file '{}' does not exist in memory", path);
else
return *p->get(); // this is a double indirection, and that freaking sucks!!
}
}
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