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