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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef XZSTREAM_h
#define XZSTREAM_h
#include <cstdlib>
#define XZ_DEC_DYNALLOC
#include "xz.h"
// Used to decode XZ stream buffers.
class XZStream
{
public:
// Returns whether the provided buffer is likely a XZ stream.
static bool IsXZ(const void* aBuf, size_t aBufSize);
// Creates a XZ stream object for the given input buffer.
XZStream(const void* aInBuf, size_t aInSize);
~XZStream();
// Initializes the decoder and returns whether decoding may commence.
bool Init();
// Decodes the next chunk of input into the given output buffer.
size_t Decode(void* aOutBuf, size_t aOutSize);
// Returns the number of yet undecoded bytes in the input buffer.
size_t RemainingInput() const;
// Returns the total number of bytes in the input buffer (compressed size).
size_t Size() const;
// Returns the expected final number of bytes in the output buffer.
// Note: will return 0 before successful Init().
size_t UncompressedSize() const;
private:
// Parses the stream footer and returns the size of the index in bytes.
size_t ParseIndexSize() const;
// Parses the stream index and returns the expected uncompressed size in bytes.
size_t ParseUncompressedSize() const;
const uint8_t* mInBuf;
size_t mUncompSize;
xz_buf mBuffers;
xz_dec* mDec;
};
#endif // XZSTREAM_h
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