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WebSocketPerMessageDeflateCompressor can work with vector or std::string

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This commit is contained in:
Benjamin Sergeant
2020-07-07 18:17:44 -07:00
parent afd9ef7d6f
commit fbe7b0b020
2 changed files with 25 additions and 8 deletions
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29
ixwebsocket/IXWebSocketPerMessageDeflateCodec.cpp
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@@ -59,11 +59,15 @@ namespace ix
return true; return true;
} }
bool WebSocketPerMessageDeflateCompressor::endsWith(const std::string& value, template<typename T>
const std::string& ending) bool WebSocketPerMessageDeflateCompressor::endsWithEmptyUnCompressedBlock(const T& value)
{ {
if (ending.size() > value.size()) return false; if (kEmptyUncompressedBlock.size() > value.size()) return false;
return std::equal(ending.rbegin(), ending.rend(), value.rbegin()); auto N = value.size();
return value[N - 1] == kEmptyUncompressedBlock[3] &&
value[N - 2] == kEmptyUncompressedBlock[2] &&
value[N - 3] == kEmptyUncompressedBlock[1] &&
value[N - 4] == kEmptyUncompressedBlock[0];
} }
bool WebSocketPerMessageDeflateCompressor::compress(const std::string& in, std::string& out) bool WebSocketPerMessageDeflateCompressor::compress(const std::string& in, std::string& out)
@@ -71,11 +75,21 @@ namespace ix
return compressData(in, out); return compressData(in, out);
} }
bool WebSocketPerMessageDeflateCompressor::compress(const std::string& in, std::vector<uint8_t>& out)
{
return compressData(in, out);
}
bool WebSocketPerMessageDeflateCompressor::compress(const std::vector<uint8_t>& in, std::string& out) bool WebSocketPerMessageDeflateCompressor::compress(const std::vector<uint8_t>& in, std::string& out)
{ {
return compressData(in, out); return compressData(in, out);
} }
bool WebSocketPerMessageDeflateCompressor::compress(const std::vector<uint8_t>& in, std::vector<uint8_t>& out)
{
return compressData(in, out);
}
template<typename T, typename S> bool WebSocketPerMessageDeflateCompressor::compressData(const T& in, S& out) template<typename T, typename S> bool WebSocketPerMessageDeflateCompressor::compressData(const T& in, S& out)
{ {
// //
@@ -106,7 +120,8 @@ namespace ix
// The normal buffer size should be 6 but // The normal buffer size should be 6 but
// we remove the 4 octets from the tail (#4) // we remove the 4 octets from the tail (#4)
uint8_t buf[2] = {0x02, 0x00}; uint8_t buf[2] = {0x02, 0x00};
out.append((char*) (buf), 2); out.push_back(buf[0]);
out.push_back(buf[1]);
return true; return true;
} }
@@ -124,10 +139,10 @@ namespace ix
output = _compressBufferSize - _deflateState.avail_out; output = _compressBufferSize - _deflateState.avail_out;
out.append((char*) (_compressBuffer.get()), output); out.insert(out.end(), _compressBuffer.get(), _compressBuffer.get() + output);
} while (_deflateState.avail_out == 0); } while (_deflateState.avail_out == 0);
if (endsWith(out, kEmptyUncompressedBlock)) if (endsWithEmptyUnCompressedBlock(out))
{ {
out.resize(out.size() - 4); out.resize(out.size() - 4);
} }

4
ixwebsocket/IXWebSocketPerMessageDeflateCodec.h
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@@ -21,12 +21,14 @@ namespace ix
bool init(uint8_t deflateBits, bool clientNoContextTakeOver); bool init(uint8_t deflateBits, bool clientNoContextTakeOver);
bool compress(const std::string& in, std::string& out); bool compress(const std::string& in, std::string& out);
bool compress(const std::string& in, std::vector<uint8_t>& out);
bool compress(const std::vector<uint8_t>& in, std::string& out); bool compress(const std::vector<uint8_t>& in, std::string& out);
bool compress(const std::vector<uint8_t>& in, std::vector<uint8_t>& out);
template<typename T, typename S> bool compressData(const T& in, S& out); template<typename T, typename S> bool compressData(const T& in, S& out);
private: private:
static bool endsWith(const std::string& value, const std::string& ending); template<typename T> bool endsWithEmptyUnCompressedBlock(const T& value);
int _flush; int _flush;
size_t _compressBufferSize; size_t _compressBufferSize;