mirror of https://github.com/PurpleI2P/i2pd
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
109 lines
2.7 KiB
C++
109 lines
2.7 KiB
C++
/*
|
|
* Copyright (c) 2013-2016, The PurpleI2P Project
|
|
*
|
|
* This file is part of Purple i2pd project and licensed under BSD3
|
|
*
|
|
* See full license text in LICENSE file at top of project tree
|
|
*/
|
|
|
|
#include <inttypes.h>
|
|
#include <string.h> /* memset */
|
|
#include <iostream>
|
|
|
|
#include "Gzip.h"
|
|
|
|
namespace i2p {
|
|
namespace data {
|
|
const size_t GZIP_CHUNK_SIZE = 16384;
|
|
|
|
GzipInflator::GzipInflator (): m_IsDirty (false)
|
|
{
|
|
memset (&m_Inflator, 0, sizeof (m_Inflator));
|
|
inflateInit2 (&m_Inflator, MAX_WBITS + 16); // gzip
|
|
}
|
|
|
|
GzipInflator::~GzipInflator ()
|
|
{
|
|
inflateEnd (&m_Inflator);
|
|
}
|
|
|
|
size_t GzipInflator::Inflate (const uint8_t * in, size_t inLen, uint8_t * out, size_t outLen)
|
|
{
|
|
if (m_IsDirty) inflateReset (&m_Inflator);
|
|
m_IsDirty = true;
|
|
m_Inflator.next_in = const_cast<uint8_t *>(in);
|
|
m_Inflator.avail_in = inLen;
|
|
m_Inflator.next_out = out;
|
|
m_Inflator.avail_out = outLen;
|
|
int err;
|
|
if ((err = inflate (&m_Inflator, Z_NO_FLUSH)) == Z_STREAM_END) {
|
|
return outLen - m_Inflator.avail_out;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void GzipInflator::Inflate (const uint8_t * in, size_t inLen, std::ostream& os)
|
|
{
|
|
m_IsDirty = true;
|
|
uint8_t * out = new uint8_t[GZIP_CHUNK_SIZE];
|
|
m_Inflator.next_in = const_cast<uint8_t *>(in);
|
|
m_Inflator.avail_in = inLen;
|
|
int ret;
|
|
do {
|
|
m_Inflator.next_out = out;
|
|
m_Inflator.avail_out = GZIP_CHUNK_SIZE;
|
|
ret = inflate (&m_Inflator, Z_NO_FLUSH);
|
|
if (ret < 0) {
|
|
inflateEnd (&m_Inflator);
|
|
os.setstate(std::ios_base::failbit);
|
|
break;
|
|
}
|
|
os.write ((char *)out, GZIP_CHUNK_SIZE - m_Inflator.avail_out);
|
|
} while (!m_Inflator.avail_out); // more data to read
|
|
delete[] out;
|
|
}
|
|
|
|
void GzipInflator::Inflate (std::istream& in, std::ostream& out)
|
|
{
|
|
uint8_t * buf = new uint8_t[GZIP_CHUNK_SIZE];
|
|
while (!in.eof ())
|
|
{
|
|
in.read ((char *) buf, GZIP_CHUNK_SIZE);
|
|
Inflate (buf, in.gcount (), out);
|
|
}
|
|
delete[] buf;
|
|
}
|
|
|
|
GzipDeflator::GzipDeflator (): m_IsDirty (false)
|
|
{
|
|
memset (&m_Deflator, 0, sizeof (m_Deflator));
|
|
deflateInit2 (&m_Deflator, Z_DEFAULT_COMPRESSION, Z_DEFLATED, 15 + 16, 8, Z_DEFAULT_STRATEGY); // 15 + 16 sets gzip
|
|
}
|
|
|
|
GzipDeflator::~GzipDeflator ()
|
|
{
|
|
deflateEnd (&m_Deflator);
|
|
}
|
|
|
|
void GzipDeflator::SetCompressionLevel (int level)
|
|
{
|
|
deflateParams (&m_Deflator, level, Z_DEFAULT_STRATEGY);
|
|
}
|
|
|
|
size_t GzipDeflator::Deflate (const uint8_t * in, size_t inLen, uint8_t * out, size_t outLen)
|
|
{
|
|
if (m_IsDirty) deflateReset (&m_Deflator);
|
|
m_IsDirty = true;
|
|
m_Deflator.next_in = const_cast<uint8_t *>(in);
|
|
m_Deflator.avail_in = inLen;
|
|
m_Deflator.next_out = out;
|
|
m_Deflator.avail_out = outLen;
|
|
int err;
|
|
if ((err = deflate (&m_Deflator, Z_FINISH)) == Z_STREAM_END) {
|
|
return outLen - m_Deflator.avail_out;
|
|
} /* else */
|
|
return 0;
|
|
}
|
|
} // data
|
|
} // i2p
|