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90 lines
2.0 KiB
C++
90 lines
2.0 KiB
C++
#pragma once
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#include <string>
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#include <vector>
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#include <unordered_map>
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#include <filesystem>
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#include "Pack.h"
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#include "PackIndex.h"
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enum class eAssetBundleType {
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None,
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Unpacked,
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Packed
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};
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struct AssetMemoryBuffer : std::streambuf {
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char* m_Base;
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bool m_Success;
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AssetMemoryBuffer(char* base, std::ptrdiff_t n, bool success) {
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m_Base = base;
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m_Success = success;
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if (!m_Success) return;
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this->setg(base, base, base + n);
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}
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~AssetMemoryBuffer() {
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if (m_Success) free(m_Base);
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}
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pos_type seekpos(pos_type sp, std::ios_base::openmode which) override {
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return seekoff(sp - pos_type(off_type(0)), std::ios_base::beg, which);
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}
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pos_type seekoff(off_type off,
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std::ios_base::seekdir dir,
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std::ios_base::openmode which = std::ios_base::in) override {
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if (dir == std::ios_base::cur)
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gbump(off);
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else if (dir == std::ios_base::end)
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setg(eback(), egptr() + off, egptr());
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else if (dir == std::ios_base::beg)
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setg(eback(), eback() + off, egptr());
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return gptr() - eback();
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}
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};
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struct AssetStream : std::istream {
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AssetStream(char* base, std::ptrdiff_t n, bool success) : std::istream(new AssetMemoryBuffer(base, n, success)) {}
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~AssetStream() {
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delete rdbuf();
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}
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operator bool() {
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return reinterpret_cast<AssetMemoryBuffer*>(rdbuf())->m_Success;
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}
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};
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class AssetManager {
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public:
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AssetManager(const std::filesystem::path& path);
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~AssetManager();
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std::filesystem::path GetResPath();
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eAssetBundleType GetAssetBundleType();
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bool HasFile(const char* name);
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bool GetFile(const char* name, char** data, uint32_t* len);
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AssetStream GetFile(const char* name);
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private:
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void LoadPackIndex();
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// Modified crc algorithm (mpeg2)
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// Reference: https://stackoverflow.com/questions/54339800/how-to-modify-crc-32-to-crc-32-mpeg-2
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inline uint32_t crc32b(uint32_t base, uint8_t* message, size_t l);
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bool m_SuccessfullyLoaded;
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std::filesystem::path m_Path;
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std::filesystem::path m_RootPath;
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std::filesystem::path m_ResPath;
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eAssetBundleType m_AssetBundleType = eAssetBundleType::None;
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PackIndex* m_PackIndex;
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};
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