metaforce/Runtime/IOStreams.hpp

#pragma once

#include <memory>

#include "Runtime/GCNTypes.hpp"

#include <athena/IStreamReader.hpp>
#include <athena/IStreamWriter.hpp>
#include <athena/MemoryReader.hpp>
#include <athena/MemoryWriter.hpp>
#ifdef URDE_ZIP_INPUT_STREAM
#include <zlib.h>
#endif

namespace urde {
using CInputStream = athena::io::IStreamReader;
using COutputStream = athena::io::IStreamWriter;

struct CBitStreamReader : athena::io::MemoryReader {
  u32 x1c_val = 0;
  u32 x20_bitOffset = 0;

public:
  static constexpr u32 GetBitCount(u32 maxVal) {
    u32 ret = 0;
    while (maxVal != 0) {
      maxVal /= 2;
      ret++;
    }

    return ret;
  }

  CBitStreamReader(const void* data, atUint64 length) : MemoryReader(data, length) {}

  s32 ReadEncoded(u32 key);
};

class CBitStreamWriter : public athena::io::MemoryWriter {
  u32 x14_val = 0;
  u32 x18_bitOffset = 0x20;

public:
  static constexpr u32 GetBitCount(u32 maxVal) { return CBitStreamReader::GetBitCount(maxVal); }

  CBitStreamWriter(atUint8* data = nullptr, atUint64 length = 0x10) : MemoryWriter(data, length) {}

  void WriteEncoded(u32 val, u32 bitCount);

  void Flush();

  ~CBitStreamWriter() override { Flush(); }
};

using CMemoryInStream = athena::io::MemoryReader;
using CMemoryOutStream = athena::io::MemoryWriter;

#ifdef URDE_ZIP_INPUT_STREAM
class CZipInputStream : public CInputStream {
  std::unique_ptr<u8[]> x24_compBuf;
  std::unique_ptr<CInputStream> x28_strm;
  z_stream x30_zstrm = {};

public:
  CZipInputStream(std::unique_ptr<CInputStream>&& strm);
  ~CZipInputStream() override;
  atUint64 readUBytesToBuf(void* buf, atUint64 len) override;
  void seek(atInt64, athena::SeekOrigin) override {}
  atUint64 position() const override { return 0; }
  atUint64 length() const override { return 0; }
};
#endif

} // namespace urde