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/*
* Copyright (C) 2003-2014 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "GunzipReader.hxx"
#include "util/Error.hxx"
#include "util/Domain.hxx"
const Domain zlib_domain("zlib");
GunzipReader::GunzipReader(Reader &_next, Error &error)
:next(_next), eof(false)
{
z.next_in = nullptr;
z.avail_in = 0;
z.zalloc = Z_NULL;
z.zfree = Z_NULL;
z.opaque = Z_NULL;
int result = inflateInit2(&z, 16 + MAX_WBITS);
if (result != Z_OK) {
z.opaque = this;
error.Set(zlib_domain, result, zError(result));
}
}
GunzipReader::~GunzipReader()
{
if (IsDefined())
inflateEnd(&z);
}
inline bool
GunzipReader::FillBuffer(Error &error)
{
auto w = buffer.Write();
assert(!w.IsEmpty());
size_t nbytes = next.Read(w.data, w.size, error);
if (nbytes == 0)
return false;
buffer.Append(nbytes);
return true;
}
size_t
GunzipReader::Read(void *data, size_t size, Error &error)
{
if (eof)
return 0;
z.next_out = (Bytef *)data;
z.avail_out = size;
while (true) {
int flush = Z_NO_FLUSH;
auto r = buffer.Read();
if (r.IsEmpty()) {
if (FillBuffer(error))
r = buffer.Read();
else if (error.IsDefined())
return 0;
else
flush = Z_FINISH;
}
z.next_in = r.data;
z.avail_in = r.size;
int result = inflate(&z, flush);
if (result == Z_STREAM_END) {
eof = true;
return size - z.avail_out;
} else if (result != Z_OK) {
error.Set(zlib_domain, result, zError(result));
return 0;
}
buffer.Consume(r.size - z.avail_in);
if (z.avail_out < size)
return size - z.avail_out;
}
}
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