132 lines
3.2 KiB
D
132 lines
3.2 KiB
D
/**
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* Socket encoding/decoding functions
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*/
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module bformat.sockets;
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import std.socket : Socket, SocketFlags, MSG_WAITALL;
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/**
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* Receives a message from the provided socket
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* by decoding the streamed bytes into bformat
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* and finally placing the resulting payload in
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* the provided array
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*
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* Params:
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* originator = the socket to receive from
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* receiveMessage = the nbuffer to receive into
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*
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* Returns: true if the receive succeeded, false otheriwse
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*/
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public bool receiveMessage(Socket originator, ref byte[] receiveMessage)
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{
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/* Construct a buffer to receive into */
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byte[] receiveBuffer;
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bool status = true;
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/* The amount of bytes received */
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long bytesReceived;
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/* Get the length of the message */
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byte[4] messageLengthBytes;
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bytesReceived = originator.receive(messageLengthBytes, cast(SocketFlags)MSG_WAITALL);
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/* If there was an error reading from the socket */
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if(!(bytesReceived > 0))
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{
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status = false;
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}
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/* If the receive was successful */
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else
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{
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/* Response message length */
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uint messageLength;
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/* Little endian version you simply read if off the bone (it's already in the correct order) */
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version(LittleEndian)
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{
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messageLength = *cast(int*)messageLengthBytes.ptr;
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}
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/* Big endian requires we byte-sapped the little-endian encoded number */
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version(BigEndian)
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{
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byte[] swappedLength;
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swappedLength.length = 4;
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swappedLength[0] = messageLengthBytes[3];
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swappedLength[1] = messageLengthBytes[2];
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swappedLength[2] = messageLengthBytes[1];
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swappedLength[3] = messageLengthBytes[0];
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messageLength = *cast(int*)swappedLength.ptr;
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}
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/* Read the full message */
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receiveBuffer.length = messageLength;
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bytesReceived = originator.receive(receiveBuffer, cast(SocketFlags)MSG_WAITALL);
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/* If there was an error reading from the socket */
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if(!(bytesReceived > 0))
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{
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status = false;
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}
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/* If there was no error receiving the message */
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else
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{
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receiveMessage = receiveBuffer;
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}
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}
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return status;
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}
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/**
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* Encodes the provided message into the bformat format
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* and sends it over the provided socket
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*
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* Params:
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* recipient = the socket to send over
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* message = the message to encode and send
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*
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* Returns: true if the send succeeded, false otherwise
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*/
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public bool sendMessage(Socket recipient, byte[] message)
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{
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/* The message buffer */
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byte[] messageBuffer;
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/* Encode the 4 byte message length header (little endian) */
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int payloadLength = cast(int)message.length;
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byte* lengthBytes = cast(byte*)&payloadLength;
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/* On little endian simply get the bytes as is (it would be encoded as little endian) */
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version(LittleEndian)
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{
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messageBuffer ~= *(lengthBytes+0);
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messageBuffer ~= *(lengthBytes+1);
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messageBuffer ~= *(lengthBytes+2);
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messageBuffer ~= *(lengthBytes+3);
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}
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/* On Big Endian you must swap the big-endian-encoded number to be in little endian ordering */
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version(BigEndian)
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{
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messageBuffer ~= *(lengthBytes+3);
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messageBuffer ~= *(lengthBytes+2);
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messageBuffer ~= *(lengthBytes+1);
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messageBuffer ~= *(lengthBytes+0);
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}
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/* Add the message to the buffer */
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messageBuffer ~= cast(byte[])message;
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/* Send the message */
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long bytesSent = recipient.send(messageBuffer);
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/* TODO: Compact this */
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return bytesSent > 0;
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} |