93 lines
2.2 KiB
C++
93 lines
2.2 KiB
C++
/*
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* Copyright 2003-2017 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "GzipOutputStream.hxx"
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#include "lib/zlib/Error.hxx"
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GzipOutputStream::GzipOutputStream(OutputStream &_next)
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:next(_next)
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{
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z.next_in = nullptr;
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z.avail_in = 0;
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z.zalloc = Z_NULL;
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z.zfree = Z_NULL;
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z.opaque = Z_NULL;
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constexpr int windowBits = 15;
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constexpr int gzip_encoding = 16;
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int result = deflateInit2(&z, Z_DEFAULT_COMPRESSION, Z_DEFLATED,
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windowBits | gzip_encoding,
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8, Z_DEFAULT_STRATEGY);
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if (result != Z_OK)
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throw ZlibError(result);
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}
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GzipOutputStream::~GzipOutputStream()
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{
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deflateEnd(&z);
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}
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void
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GzipOutputStream::Flush()
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{
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/* no more input */
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z.next_in = nullptr;
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z.avail_in = 0;
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while (true) {
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Bytef output[4096];
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z.next_out = output;
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z.avail_out = sizeof(output);
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int result = deflate(&z, Z_FINISH);
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if (z.next_out > output)
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next.Write(output, z.next_out - output);
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if (result == Z_STREAM_END)
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break;
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else if (result != Z_OK)
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throw ZlibError(result);
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}
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}
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void
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GzipOutputStream::Write(const void *_data, size_t size)
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{
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/* zlib's API requires non-const input pointer */
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void *data = const_cast<void *>(_data);
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z.next_in = reinterpret_cast<Bytef *>(data);
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z.avail_in = size;
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while (z.avail_in > 0) {
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Bytef output[4096];
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z.next_out = output;
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z.avail_out = sizeof(output);
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int result = deflate(&z, Z_NO_FLUSH);
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if (result != Z_OK)
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throw ZlibError(result);
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if (z.next_out > output)
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next.Write(output, z.next_out - output);
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}
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}
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