1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/js/src/vm/Compression.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,55 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
1.5 + * vim: set ts=8 sts=4 et sw=4 tw=99:
1.6 + * This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#ifndef vm_Compression_h
1.11 +#define vm_Compression_h
1.12 +
1.13 +#ifdef USE_ZLIB
1.14 +
1.15 +#include <zlib.h>
1.16 +
1.17 +#include "jstypes.h"
1.18 +
1.19 +namespace js {
1.20 +
1.21 +class Compressor
1.22 +{
1.23 + /* Number of bytes we should hand to zlib each compressMore() call. */
1.24 + static const size_t CHUNKSIZE = 2048;
1.25 + z_stream zs;
1.26 + const unsigned char *inp;
1.27 + size_t inplen;
1.28 + size_t outbytes;
1.29 + bool initialized;
1.30 +
1.31 + public:
1.32 + enum Status {
1.33 + MOREOUTPUT,
1.34 + DONE,
1.35 + CONTINUE,
1.36 + OOM
1.37 + };
1.38 +
1.39 + Compressor(const unsigned char *inp, size_t inplen);
1.40 + ~Compressor();
1.41 + bool init();
1.42 + void setOutput(unsigned char *out, size_t outlen);
1.43 + size_t outWritten() const { return outbytes; }
1.44 + /* Compress some of the input. Return true if it should be called again. */
1.45 + Status compressMore();
1.46 +};
1.47 +
1.48 +/*
1.49 + * Decompress a string. The caller must know the length of the output and
1.50 + * allocate |out| to a string of that length.
1.51 + */
1.52 +bool DecompressString(const unsigned char *inp, size_t inplen,
1.53 + unsigned char *out, size_t outlen);
1.54 +
1.55 +} /* namespace js */
1.56 +
1.57 +#endif /* USE_ZLIB */
1.58 +#endif /* vm_Compression_h */
