Add shared/buffer.[ch] for easily dealing with array values.

shared/buffer.c

@@ -0,0 +1,65 @@
+#include "buffer.h"
+
+uint8_t GetBufferUint8(uint8_t *buffer, uint32_t offset)
+{
+    return *(uint8_t*)(buffer + offset);
+}
+
+uint16_t GetBufferUint16(uint8_t *buffer, uint32_t offset)
+{
+    return *(uint16_t*)(buffer+ offset);
+}
+
+uint32_t GetBufferUint32(uint8_t *buffer, uint32_t offset)
+{
+    return *(uint32_t*)(buffer + offset);
+}
+
+uint8_t  GetBufferUint8Be(uint8_t *buffer, uint32_t offset)
+{
+    return buffer[offset];
+}
+
+uint16_t GetBufferUint16Be(uint8_t *buffer, uint32_t offset)
+{
+    return (buffer[offset] << 8) + (buffer[offset+1] << 0);
+}
+
+uint32_t GetBufferUint32Be(uint8_t *buffer, uint32_t offset)
+{
+    return (buffer[offset] << 24) + (buffer[offset+1] << 16) + (buffer[offset+2] << 8) + (buffer[offset+3] << 0);
+}
+
+void SetBufferUint8(uint8_t *buffer, uint32_t offset, uint8_t value)
+{
+    *(uint8_t*)(buffer + offset) = value;
+}
+
+void SetBufferUint16(uint8_t *buffer, uint32_t offset, uint16_t value)
+{
+    *(uint16_t*)(buffer + offset) = value;
+}
+
+void SetBufferUint32(uint8_t *buffer, uint32_t offset, uint32_t value)
+{
+    *(uint32_t*)(buffer + offset) = value;
+}
+
+void SetBufferUint8Be(uint8_t *buffer, uint32_t offset, uint8_t value)
+{
+    buffer[offset] = value;
+}
+
+void SetBufferUint16Be(uint8_t *buffer, uint32_t offset, uint16_t value)
+{
+    buffer[offset+0] = (value >> 8) & 0xff;
+    buffer[offset+1] = (value >> 0) & 0xff;
+}
+
+void SetBufferUint32Be(uint8_t *buffer, uint32_t offset, uint32_t value)
+{
+    buffer[offset+0] = (value >> 24) & 0xff;
+    buffer[offset+1] = (value >> 16) & 0xff;
+    buffer[offset+2] = (value >>  8) & 0xff;
+    buffer[offset+3] = (value >>  0) & 0xff;
+}