mirror of https://github.com/PurpleI2P/i2pd.git
I2P: End-to-End encrypted and anonymous Internet
https://i2pd.website/
115 lines
2.8 KiB
115 lines
2.8 KiB
/* |
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* Copyright (c) 2013-2017, The PurpleI2P Project |
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* |
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* This file is part of Purple i2pd project and licensed under BSD3 |
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* |
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* See full license text in LICENSE file at top of project tree |
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*/ |
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#include <inttypes.h> |
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#include <string.h> /* memset */ |
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#include <iostream> |
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#include "Log.h" |
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#include "Gzip.h" |
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namespace i2p |
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{ |
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namespace data |
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{ |
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const size_t GZIP_CHUNK_SIZE = 16384; |
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GzipInflator::GzipInflator (): m_IsDirty (false) |
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{ |
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memset (&m_Inflator, 0, sizeof (m_Inflator)); |
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inflateInit2 (&m_Inflator, MAX_WBITS + 16); // gzip |
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} |
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GzipInflator::~GzipInflator () |
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{ |
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inflateEnd (&m_Inflator); |
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} |
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size_t GzipInflator::Inflate (const uint8_t * in, size_t inLen, uint8_t * out, size_t outLen) |
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{ |
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if (m_IsDirty) inflateReset (&m_Inflator); |
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m_IsDirty = true; |
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m_Inflator.next_in = const_cast<uint8_t *>(in); |
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m_Inflator.avail_in = inLen; |
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m_Inflator.next_out = out; |
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m_Inflator.avail_out = outLen; |
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int err; |
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if ((err = inflate (&m_Inflator, Z_NO_FLUSH)) == Z_STREAM_END) |
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return outLen - m_Inflator.avail_out; |
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// else |
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LogPrint (eLogError, "Gzip: Inflate error ", err); |
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return 0; |
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} |
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void GzipInflator::Inflate (const uint8_t * in, size_t inLen, std::ostream& os) |
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{ |
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m_IsDirty = true; |
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uint8_t * out = new uint8_t[GZIP_CHUNK_SIZE]; |
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m_Inflator.next_in = const_cast<uint8_t *>(in); |
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m_Inflator.avail_in = inLen; |
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int ret; |
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do |
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{ |
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m_Inflator.next_out = out; |
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m_Inflator.avail_out = GZIP_CHUNK_SIZE; |
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ret = inflate (&m_Inflator, Z_NO_FLUSH); |
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if (ret < 0) |
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{ |
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inflateEnd (&m_Inflator); |
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os.setstate(std::ios_base::failbit); |
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break; |
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} |
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os.write ((char *)out, GZIP_CHUNK_SIZE - m_Inflator.avail_out); |
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} |
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while (!m_Inflator.avail_out); // more data to read |
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delete[] out; |
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} |
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void GzipInflator::Inflate (std::istream& in, std::ostream& out) |
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{ |
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uint8_t * buf = new uint8_t[GZIP_CHUNK_SIZE]; |
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while (!in.eof ()) |
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{ |
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in.read ((char *) buf, GZIP_CHUNK_SIZE); |
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Inflate (buf, in.gcount (), out); |
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} |
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delete[] buf; |
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} |
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GzipDeflator::GzipDeflator (): m_IsDirty (false) |
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{ |
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memset (&m_Deflator, 0, sizeof (m_Deflator)); |
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deflateInit2 (&m_Deflator, Z_DEFAULT_COMPRESSION, Z_DEFLATED, 15 + 16, 8, Z_DEFAULT_STRATEGY); // 15 + 16 sets gzip |
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} |
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GzipDeflator::~GzipDeflator () |
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{ |
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deflateEnd (&m_Deflator); |
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} |
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void GzipDeflator::SetCompressionLevel (int level) |
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{ |
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deflateParams (&m_Deflator, level, Z_DEFAULT_STRATEGY); |
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} |
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size_t GzipDeflator::Deflate (const uint8_t * in, size_t inLen, uint8_t * out, size_t outLen) |
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{ |
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if (m_IsDirty) deflateReset (&m_Deflator); |
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m_IsDirty = true; |
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m_Deflator.next_in = const_cast<uint8_t *>(in); |
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m_Deflator.avail_in = inLen; |
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m_Deflator.next_out = out; |
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m_Deflator.avail_out = outLen; |
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int err; |
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if ((err = deflate (&m_Deflator, Z_FINISH)) == Z_STREAM_END) |
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return outLen - m_Deflator.avail_out; |
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// else |
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LogPrint (eLogError, "Gzip: Deflate error ", err); |
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return 0; |
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} |
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} // data |
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} // i2p
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