diff -r 240620f46dd7 -r 613998625a3c project_files/frontlib/ipc/ipcbase.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/project_files/frontlib/ipc/ipcbase.c	Tue Jun 19 21:17:05 2012 +0200
@@ -0,0 +1,200 @@
+#include "ipcbase.h"
+#include "../util/logging.h"
+#include "../util/util.h"
+#include "../socket.h"
+
+#include <string.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+/*
+ * The receive buffer has to be able to hold any message that might be received. Normally
+ * the messages are at most 256 bytes, but the map preview contains 4097 bytes (4096 for a
+ * bitmap, 1 for the number of hogs which fit on the map).
+ *
+ * We don't need to worry about wasting a few kb though, and I like powers of two...
+ */
+struct _flib_ipcbase {
+	uint8_t readBuffer[8192];
+	int readBufferSize;
+
+	flib_acceptor *acceptor;
+	uint16_t port;
+
+	flib_tcpsocket *sock;
+};
+
+flib_ipcbase *flib_ipcbase_create() {
+	flib_ipcbase *result = flib_calloc(1, sizeof(flib_ipcbase));
+	flib_acceptor *acceptor = flib_acceptor_create(0);
+
+	if(!result || !acceptor) {
+		free(result);
+		flib_acceptor_close(acceptor);
+		return NULL;
+	}
+
+	result->acceptor = acceptor;
+	result->sock = NULL;
+	result->readBufferSize = 0;
+	result->port = flib_acceptor_listenport(acceptor);
+
+	flib_log_i("Started listening for IPC connections on port %u", (unsigned)result->port);
+	return result;
+}
+
+uint16_t flib_ipcbase_port(flib_ipcbase *ipc) {
+	if(!ipc) {
+		flib_log_e("null parameter in flib_ipcbase_port");
+		return 0;
+	}
+	return ipc->port;
+}
+
+void flib_ipcbase_destroy(flib_ipcbase *ipc) {
+	if(ipc) {
+		flib_acceptor_close(ipc->acceptor);
+		flib_socket_close(ipc->sock);
+		free(ipc);
+	}
+}
+
+IpcState flib_ipcbase_state(flib_ipcbase *ipc) {
+	if(!ipc) {
+		flib_log_e("null parameter in flib_ipcbase_state");
+		return IPC_NOT_CONNECTED;
+	} else if(ipc->sock) {
+		return IPC_CONNECTED;
+	} else if(ipc->acceptor) {
+		return IPC_LISTENING;
+	} else {
+		return IPC_NOT_CONNECTED;
+	}
+}
+
+static bool isMessageReady(flib_ipcbase *ipc) {
+	return ipc->readBufferSize >= ipc->readBuffer[0]+1;
+}
+
+static void receiveToBuffer(flib_ipcbase *ipc) {
+	if(ipc->sock) {
+		int size = flib_socket_nbrecv(ipc->sock, ipc->readBuffer+ipc->readBufferSize, sizeof(ipc->readBuffer)-ipc->readBufferSize);
+		if(size>=0) {
+			ipc->readBufferSize += size;
+		} else {
+			flib_socket_close(ipc->sock);
+			ipc->sock = NULL;
+		}
+	}
+}
+
+int flib_ipcbase_recv_message(flib_ipcbase *ipc, void *data) {
+	if(!ipc || !data) {
+		flib_log_e("null parameter in flib_ipcbase_recv_message");
+		return -1;
+	}
+
+	if(!isMessageReady(ipc)) {
+		receiveToBuffer(ipc);
+	}
+
+	if(isMessageReady(ipc)) {
+		int msgsize = ipc->readBuffer[0]+1;
+		memcpy(data, ipc->readBuffer, msgsize);
+		memmove(ipc->readBuffer, ipc->readBuffer+msgsize, ipc->readBufferSize-msgsize);
+		ipc->readBufferSize -= msgsize;
+		return msgsize;
+	} else if(!ipc->sock && ipc->readBufferSize>0) {
+		flib_log_w("Last message from engine data stream is incomplete (received %u of %u bytes)", (unsigned)ipc->readBufferSize, (unsigned)(ipc->readBuffer[0])+1);
+		ipc->readBufferSize = 0;
+		return -1;
+	} else {
+		return -1;
+	}
+}
+
+int flib_ipcbase_recv_map(flib_ipcbase *ipc, void *data) {
+	if(!ipc || !data) {
+		flib_log_e("null parameter in flib_ipcbase_recv_map");
+		return -1;
+	}
+
+	receiveToBuffer(ipc);
+
+	if(ipc->readBufferSize >= IPCBASE_MAPMSG_BYTES) {
+		memcpy(data, ipc->readBuffer, IPCBASE_MAPMSG_BYTES);
+		memmove(ipc->readBuffer, ipc->readBuffer+IPCBASE_MAPMSG_BYTES, ipc->readBufferSize-IPCBASE_MAPMSG_BYTES);
+		return IPCBASE_MAPMSG_BYTES;
+	} else {
+		return -1;
+	}
+}
+
+static void logSentMsg(const uint8_t *data, size_t len) {
+	if(flib_log_isActive(FLIB_LOGLEVEL_DEBUG)) {
+		size_t msgStart = 0;
+		while(msgStart < len) {
+			uint8_t msglen = data[msgStart];
+			if(msgStart+msglen < len) {
+				flib_log_d("[IPC OUT][%03u]%*.*s",(unsigned)msglen, (unsigned)msglen, (unsigned)msglen, data+msgStart+1);
+			} else {
+				uint8_t msglen2 = len-msgStart-1;
+				flib_log_d("[IPC OUT][%03u/%03u]%*.*s",(unsigned)msglen2, (unsigned)msglen, (unsigned)msglen2, (unsigned)msglen2, data+msgStart+1);
+			}
+			msgStart += (uint8_t)data[msgStart]+1;
+		}
+	}
+}
+
+int flib_ipcbase_send_raw(flib_ipcbase *ipc, const void *data, size_t len) {
+	if(!ipc || (!data && len>0)) {
+		flib_log_e("null parameter in flib_ipcbase_send_raw");
+		return -1;
+	}
+	if(!ipc->sock) {
+		flib_log_w("flib_ipcbase_send_raw: Not connected.");
+		return -1;
+	}
+
+	if(flib_socket_send(ipc->sock, data, len) == len) {
+		logSentMsg(data, len);
+		return 0;
+	} else {
+		flib_log_w("Failed or incomplete ICP write: engine connection lost.");
+		flib_socket_close(ipc->sock);
+		ipc->sock = NULL;
+		return -1;
+	}
+}
+
+int flib_ipcbase_send_message(flib_ipcbase *ipc, void *data, size_t len) {
+	if(!ipc || (!data && len>0)) {
+		flib_log_e("null parameter in flib_ipcbase_send_message");
+		return -1;
+	} else if(len>255) {
+		flib_log_e("Overlong message (%zu bytes) in flib_ipcbase_send_message", len);
+		return -1;
+	}
+
+	uint8_t sendbuf[256];
+	sendbuf[0] = len;
+	memcpy(sendbuf+1, data, len);
+	return flib_ipcbase_send_raw(ipc, sendbuf, len+1);
+}
+
+int flib_ipcbase_send_messagestr(flib_ipcbase *ipc, char *data) {
+	return flib_ipcbase_send_message(ipc, data, strlen(data));
+}
+
+void flib_ipcbase_accept(flib_ipcbase *ipc) {
+	if(!ipc) {
+		flib_log_e("null parameter in flib_ipcbase_accept");
+	} else if(!ipc->sock && ipc->acceptor) {
+		ipc->sock = flib_socket_accept(ipc->acceptor, true);
+		if(ipc->sock) {
+			flib_acceptor_close(ipc->acceptor);
+			ipc->acceptor = NULL;
+		}
+	}
+}