Merge pull request #10 from jmtomas/4

1 files changed, 37 insertions, 0 deletions

diff --git a/ipc.cpp b/ipc.cpp
new file mode 100644
index 0000000..9c96d5a
--- /dev/null
+++ b/ipc.cpp
@@ -0,0 +1,37 @@
+enum Operation {
+	OP_NULL = 0,
+	OP_MOVE1,
+	OP_MOVE2,
+	OP_MOVE4,
+	OP_MOVE8,
+	OP_INSERT,
+	OP_DELETE,
+	OP_SHOW
+};
+
+void encode2(int16_t data, uint8_t *message, size_t offset) {
+	message[offset]     =  data & 0x00ff;
+	message[offset + 1] = (data & 0xff00) >> 8;
+}
+
+int16_t decode2(uint8_t *message, size_t offset) {
+	return message[offset] | ((int16_t)message[offset + 1] << 8);
+}
+
+void encode4(int32_t data, uint8_t *message, size_t offset) {
+	encode2( data & 0x0000ffff,        message, offset);
+	encode2((data & 0xffff0000) >> 16, message, offset + 2);
+}
+
+int32_t decode4(uint8_t *message, size_t offset) {
+	return decode2(message, offset) | ((int32_t)decode2(message, offset + 2) << 16);
+}
+
+void encode8(int64_t data, uint8_t *message, size_t offset) {
+	encode4( data & 0x00000000ffffffff,        message, offset);
+	encode4((data & 0xffffffff00000000) >> 32, message, offset + 4);
+}
+
+int64_t decode8(uint8_t *message, size_t offset) {
+	return decode4(message, offset) | ((int64_t)decode4(message, offset + 4) << 32);
+}