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Add WebSocket::receiveFrame() that appends to a Poco::Buffer<char>

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This commit is contained in:
Tor Lillqvist
2015-03-07 14:38:42 +02:00
parent 4336528290
commit 08a748dae1
6 changed files with 163 additions and 53 deletions
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124
Net/src/WebSocketImpl.cpp
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@@ -104,7 +104,7 @@ int WebSocketImpl::sendBytes(const void* buffer, int length, int flags)
}
int WebSocketImpl::receiveBytes(void* buffer, int length, int)
int WebSocketImpl::receiveHeader(char mask[4], bool& useMask)
{
char header[MAX_HEADER_LENGTH];
int n = receiveNBytes(header, 2);
@@ -114,82 +114,100 @@ int WebSocketImpl::receiveBytes(void* buffer, int length, int)
return n;
}
poco_assert (n == 2);
Poco::UInt8 lengthByte = static_cast<Poco::UInt8>(header[1]);
int maskOffset = 0;
if (lengthByte & FRAME_FLAG_MASK) maskOffset += 4;
lengthByte &= 0x7f;
if (lengthByte > 0 || maskOffset > 0)
{
if (lengthByte + 2 + maskOffset < MAX_HEADER_LENGTH)
{
n = receiveNBytes(header + 2, lengthByte + maskOffset);
}
else
{
n = receiveNBytes(header + 2, MAX_HEADER_LENGTH - 2);
}
if (n <= 0) throw WebSocketException("Incomplete header received", WebSocket::WS_ERR_INCOMPLETE_FRAME);
n += 2;
}
Poco::MemoryInputStream istr(header, n);
Poco::BinaryReader reader(istr, Poco::BinaryReader::NETWORK_BYTE_ORDER);
Poco::UInt8 flags;
char mask[4];
reader >> flags >> lengthByte;
Poco::UInt8 flags = static_cast<Poco::UInt8>(header[0]);
_frameFlags = flags;
int payloadLength = 0;
int payloadOffset = 2;
if ((lengthByte & 0x7f) == 127)
Poco::UInt8 lengthByte = static_cast<Poco::UInt8>(header[1]);
useMask = ((lengthByte & FRAME_FLAG_MASK) != 0);
int payloadLength;
lengthByte &= 0x7f;
if (lengthByte == 127)
{
n = receiveNBytes(header + 2, 8);
if (n <= 0)
{
_frameFlags = 0;
return n;
}
Poco::MemoryInputStream istr(header + 2, 8);
Poco::BinaryReader reader(istr, Poco::BinaryReader::NETWORK_BYTE_ORDER);
Poco::UInt64 l;
reader >> l;
if (l > length) throw WebSocketException(Poco::format("Insufficient buffer for payload size %Lu", l), WebSocket::WS_ERR_PAYLOAD_TOO_BIG);
payloadLength = static_cast<int>(l);
payloadOffset += 8;
}
else if ((lengthByte & 0x7f) == 126)
} else if (lengthByte == 126)
{
n = receiveNBytes(header + 2, 2);
if (n <= 0)
{
_frameFlags = 0;
return n;
}
Poco::MemoryInputStream istr(header + 2, 2);
Poco::BinaryReader reader(istr, Poco::BinaryReader::NETWORK_BYTE_ORDER);
Poco::UInt16 l;
reader >> l;
if (l > length) throw WebSocketException(Poco::format("Insufficient buffer for payload size %hu", l), WebSocket::WS_ERR_PAYLOAD_TOO_BIG);
payloadLength = static_cast<int>(l);
payloadOffset += 2;
}
else
{
Poco::UInt8 l = lengthByte & 0x7f;
if (l > length) throw WebSocketException(Poco::format("Insufficient buffer for payload size %u", unsigned(l)), WebSocket::WS_ERR_PAYLOAD_TOO_BIG);
payloadLength = static_cast<int>(l);
payloadLength = lengthByte;
}
if (lengthByte & FRAME_FLAG_MASK)
if (useMask)
{
reader.readRaw(mask, 4);
payloadOffset += 4;
n = receiveNBytes(mask, 4);
if (n <= 0)
{
_frameFlags = 0;
return n;
}
}
int received = 0;
if (payloadOffset < n)
return payloadLength;
}
int WebSocketImpl::receivePayload(char *buffer, int payloadLength, char mask[4], bool useMask)
{
int received = receiveNBytes(reinterpret_cast<char*>(buffer), payloadLength);
if (received <= 0) throw WebSocketException("Incomplete frame received", WebSocket::WS_ERR_INCOMPLETE_FRAME);
if (useMask)
{
std::memcpy(buffer, header + payloadOffset, n - payloadOffset);
received = n - payloadOffset;
}
if (received < payloadLength)
{
n = receiveNBytes(reinterpret_cast<char*>(buffer) + received, payloadLength - received);
if (n <= 0) throw WebSocketException("Incomplete frame received", WebSocket::WS_ERR_INCOMPLETE_FRAME);
received += n;
}
if (lengthByte & FRAME_FLAG_MASK)
{
char* p = reinterpret_cast<char*>(buffer);
for (int i = 0; i < received; i++)
{
p[i] ^= mask[i % 4];
buffer[i] ^= mask[i % 4];
}
}
return received;
}
int WebSocketImpl::receiveBytes(void* buffer, int length, int)
{
char mask[4];
bool useMask;
int payloadLength = receiveHeader(mask, useMask);
if (payloadLength <= 0)
return payloadLength;
if (payloadLength > length)
throw WebSocketException(Poco::format("Insufficient buffer for payload size %hu", payloadLength), WebSocket::WS_ERR_PAYLOAD_TOO_BIG);
return receivePayload(reinterpret_cast<char*>(buffer), payloadLength, mask, useMask);
}
int WebSocketImpl::receiveBytes(Poco::Buffer<char>& buffer, int)
{
char mask[4];
bool useMask;
int payloadLength = receiveHeader(mask, useMask);
if (payloadLength <= 0)
return payloadLength;
int oldSize = buffer.size();
buffer.resize(oldSize + payloadLength);
return receivePayload(buffer.begin() + oldSize, payloadLength, mask, useMask);
}
int WebSocketImpl::receiveNBytes(void* buffer, int bytes)
{
int received = _pStreamSocketImpl->receiveBytes(reinterpret_cast<char*>(buffer), bytes);