125 lines
3.1 KiB
C++
125 lines
3.1 KiB
C++
/*
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* Copyright 2014-2021 Max Kellermann <max.kellermann@gmail.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "GzipOutputStream.hxx"
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#include "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::SyncFlush()
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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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do {
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Bytef output[16384];
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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_SYNC_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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break;
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next.Write(output, z.next_out - output);
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} while (z.avail_out == 0);
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}
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void
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GzipOutputStream::Finish()
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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[16384];
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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[65536];
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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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