Fix decoding

1 files changed, 12 insertions, 9 deletions

diff --git a/ipc.cpp b/ipc.cpp
index 9c96d5a..7d46307 100644
--- a/ipc.cpp
+++ b/ipc.cpp
@@ -9,29 +9,32 @@ enum Operation {
 	OP_SHOW
 };
 
-void encode2(int16_t data, uint8_t *message, size_t offset) {
+void encode2(int16_t data, int8_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);
+int16_t decode2(int8_t *message, size_t offset) {
+	return (int16_t)message[offset + 1] << 8 & 0xff00
+	     | (int16_t)message[offset]          & 0x00ff;
 }
 
-void encode4(int32_t data, uint8_t *message, size_t offset) {
+void encode4(int32_t data, int8_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);
+int32_t decode4(int8_t *message, size_t offset) {
+	return (int32_t)decode2(message, offset + 2) << 16 & 0xffff0000
+	     | (int32_t)decode2(message, offset)           & 0x0000ffff;
 }
 
-void encode8(int64_t data, uint8_t *message, size_t offset) {
+void encode8(int64_t data, int8_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);
+int64_t decode8(int8_t *message, size_t offset) {
+	return (int64_t)decode4(message, offset + 4) << 32 & 0xffffffff00000000
+	     | (int64_t)decode4(message, offset)           & 0x00000000ffffffff;
 }