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53 lines
1.4 KiB
C++
53 lines
1.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sts=4 et sw=4 tw=99:
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* 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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef vm_Compression_h
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#define vm_Compression_h
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#include <zlib.h>
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#include "jstypes.h"
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namespace js {
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class Compressor
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{
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/* Number of bytes we should hand to zlib each compressMore() call. */
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static const size_t CHUNKSIZE = 2048;
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z_stream zs;
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const unsigned char* inp;
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size_t inplen;
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size_t outbytes;
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bool initialized;
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public:
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enum Status {
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MOREOUTPUT,
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DONE,
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CONTINUE,
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OOM
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};
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Compressor(const unsigned char* inp, size_t inplen);
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~Compressor();
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bool init();
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void setOutput(unsigned char* out, size_t outlen);
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size_t outWritten() const { return outbytes; }
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/* Compress some of the input. Return true if it should be called again. */
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Status compressMore();
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};
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/*
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* Decompress a string. The caller must know the length of the output and
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* allocate |out| to a string of that length.
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*/
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bool DecompressString(const unsigned char* inp, size_t inplen,
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unsigned char* out, size_t outlen);
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} /* namespace js */
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#endif /* vm_Compression_h */
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