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nx_compress.c
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nx_compress.c
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/*
* NX-GZIP compression accelerator user library
*
* Copyright (C) IBM Corporation, 2011-2017
*
* Licenses for GPLv2 and Apache v2.0:
*
* GPLv2:
*
* 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.
*
*
* Apache v2.0:
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Author: Xiao Lei Hu <xlhu@cn.ibm.com>
*
*/
#include <zlib.h>
#include "nx_zlib.h"
int nx_compress2(Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen, int level)
{
z_stream stream;
int rc;
const uInt max = 1<<30;
uLong remaining;
remaining = *destLen;
*destLen = 0;
stream.zalloc = (alloc_func)0;
stream.zfree = (free_func)0;
stream.opaque = (voidpf)0;
prt_info("nx_compress2 begin: sourceLen %ld\n", sourceLen);
rc = nx_deflateInit(&stream, level);
if (rc != Z_OK) return rc;
stream.next_out = dest;
stream.avail_out = 0;
stream.next_in = (z_const Bytef *)source;
stream.avail_in = 0;
do {
if (stream.avail_out == 0) {
stream.avail_out = remaining > (uLong)max ? max : (uInt)remaining;
remaining -= stream.avail_out;
}
if (stream.avail_in == 0) {
stream.avail_in = sourceLen > (uLong)max ? max : (uInt)sourceLen;
sourceLen -= stream.avail_in;
}
rc = nx_deflate(&stream, sourceLen ? Z_NO_FLUSH : Z_FINISH);
prt_info(" err %d\n", rc);
} while (rc == Z_OK);
*destLen = stream.total_out;
nx_deflateEnd(&stream);
prt_info("nx_compress2 end: destLen %ld\n", *destLen);
return rc == Z_STREAM_END ? Z_OK : rc;
}
int nx_compress(Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen)
{
return nx_compress2(dest, destLen, source, sourceLen, Z_DEFAULT_COMPRESSION);
}
uLong nx_compressBound(uLong sourceLen)
{
return sourceLen * 15/8 + NX_MIN( sysconf(_SC_PAGESIZE), 1<<16 );
// return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) +
// (sourceLen >> 25) + 13;
}
#ifdef ZLIB_API
int compress(Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen)
{
return nx_compress(dest, destLen, source, sourceLen);
}
int compress2(Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen, int level)
{
return nx_compress2(dest, destLen, source, sourceLen, level);
}
uLong compressBound(uLong sourceLen)
{
return nx_compressBound(sourceLen);
}
#endif