michael@0: /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
michael@0:  * vim: set ts=8 sts=4 et sw=4 tw=99:
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef vm_Compression_h
michael@0: #define vm_Compression_h
michael@0: 
michael@0: #ifdef USE_ZLIB
michael@0: 
michael@0: #include <zlib.h>
michael@0: 
michael@0: #include "jstypes.h"
michael@0: 
michael@0: namespace js {
michael@0: 
michael@0: class Compressor
michael@0: {
michael@0:     /* Number of bytes we should hand to zlib each compressMore() call. */
michael@0:     static const size_t CHUNKSIZE = 2048;
michael@0:     z_stream zs;
michael@0:     const unsigned char *inp;
michael@0:     size_t inplen;
michael@0:     size_t outbytes;
michael@0:     bool initialized;
michael@0: 
michael@0:   public:
michael@0:     enum Status {
michael@0:         MOREOUTPUT,
michael@0:         DONE,
michael@0:         CONTINUE,
michael@0:         OOM
michael@0:     };
michael@0: 
michael@0:     Compressor(const unsigned char *inp, size_t inplen);
michael@0:     ~Compressor();
michael@0:     bool init();
michael@0:     void setOutput(unsigned char *out, size_t outlen);
michael@0:     size_t outWritten() const { return outbytes; }
michael@0:     /* Compress some of the input. Return true if it should be called again. */
michael@0:     Status compressMore();
michael@0: };
michael@0: 
michael@0: /*
michael@0:  * Decompress a string. The caller must know the length of the output and
michael@0:  * allocate |out| to a string of that length.
michael@0:  */
michael@0: bool DecompressString(const unsigned char *inp, size_t inplen,
michael@0:                       unsigned char *out, size_t outlen);
michael@0: 
michael@0: } /* namespace js */
michael@0: 
michael@0: #endif /* USE_ZLIB */
michael@0: #endif /* vm_Compression_h */