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