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Adds support for compressing websockets
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Francisco Facioni
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Nov 15, 2018
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| #pragma once | ||
| #include "crow/settings.h" | ||
| #include <boost/asio/streambuf.hpp> | ||
| #include <zlib.h> | ||
| #include <string> | ||
|
|
||
| namespace crow { | ||
| class zlib_compressor { | ||
| public: | ||
| zlib_compressor(bool reset_before_compress, bool noheader, int window_bits, int level, int mem_level, int strategy) | ||
| : reset_before_compress(reset_before_compress) | ||
| , window_bits(window_bits) { | ||
| stream = std::make_unique<z_stream>(); | ||
| stream->zalloc = 0; | ||
| stream->zfree = 0; | ||
| stream->opaque = 0; | ||
|
|
||
| ::deflateInit2(stream.get(), | ||
| level, | ||
| Z_DEFLATED, | ||
| (noheader ? -window_bits : window_bits), | ||
| mem_level, | ||
| strategy | ||
| ); | ||
| } | ||
|
|
||
| ~zlib_compressor() { | ||
| ::deflateEnd(stream.get()); | ||
| } | ||
|
|
||
| std::string compress(const std::string& src) { | ||
| if(reset_before_compress) | ||
| ::deflateReset(stream.get()); | ||
|
|
||
| stream->next_in = reinterpret_cast<uint8_t*>(const_cast<char*>(src.c_str())); | ||
| stream->avail_in = src.size(); | ||
|
|
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| const uint64_t bufferSize = 256; | ||
| boost::asio::streambuf buffer; | ||
| do { | ||
| boost::asio::streambuf::mutable_buffers_type chunk = buffer.prepare(bufferSize); | ||
|
|
||
| uint8_t* next_out = boost::asio::buffer_cast<uint8_t*>(chunk); | ||
|
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| stream->next_out = next_out; | ||
| stream->avail_out = bufferSize; | ||
|
|
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| ::deflate(stream.get(), reset_before_compress ? Z_FINISH : Z_SYNC_FLUSH); | ||
|
|
||
| uint64_t outputSize = stream->next_out - next_out; | ||
| buffer.commit(outputSize); | ||
| } while(stream->avail_out == 0); | ||
|
|
||
| uint64_t buffer_size = buffer.size(); | ||
| if(!reset_before_compress) buffer_size -= 4; | ||
|
|
||
| return std::string(boost::asio::buffer_cast<const char*>(buffer.data()), buffer_size); | ||
| } | ||
|
|
||
| std::unique_ptr<z_stream> stream; | ||
|
|
||
| bool reset_before_compress; | ||
| int window_bits; | ||
| }; | ||
|
|
||
| class zlib_decompressor { | ||
| public: | ||
| zlib_decompressor(bool reset_before_decompress, bool noheader, int window_bits) | ||
| : reset_before_decompress(reset_before_decompress) | ||
| , window_bits(window_bits) { | ||
| stream = std::make_unique<z_stream>(); | ||
| stream->zalloc = 0; | ||
| stream->zfree = 0; | ||
| stream->opaque = 0; | ||
|
|
||
| ::inflateInit2(stream.get(), (noheader ? -window_bits : window_bits)); | ||
| } | ||
|
|
||
| ~zlib_decompressor() { | ||
| inflateEnd(stream.get()); | ||
| } | ||
|
|
||
| std::string decompress(std::string src) { | ||
| if(reset_before_decompress) | ||
| inflateReset(stream.get()); | ||
|
|
||
| src.push_back('\x00'); | ||
| src.push_back('\x00'); | ||
| src.push_back('\xff'); | ||
| src.push_back('\xff'); | ||
|
|
||
| stream->next_in = reinterpret_cast<uint8_t*>(const_cast<char*>(src.c_str())); | ||
| stream->avail_in = src.size(); | ||
|
|
||
| const uint64_t bufferSize = 256; | ||
| boost::asio::streambuf buffer; | ||
| do { | ||
| boost::asio::streambuf::mutable_buffers_type chunk = buffer.prepare(bufferSize); | ||
|
|
||
| uint8_t* next_out = boost::asio::buffer_cast<uint8_t*>(chunk); | ||
|
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| stream->next_out = next_out; | ||
| stream->avail_out = bufferSize; | ||
|
|
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| ::inflate(stream.get(), reset_before_decompress ? Z_FINISH : Z_SYNC_FLUSH); | ||
| buffer.commit(stream->next_out - next_out); | ||
| } while(stream->avail_out == 0); | ||
|
|
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| return std::string(boost::asio::buffer_cast<const char*>(buffer.data()), buffer.size()); | ||
| } | ||
|
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| std::unique_ptr<z_stream> stream; | ||
|
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| bool reset_before_decompress; | ||
| int window_bits; | ||
| }; | ||
| } |