1 files changed, 38 insertions, 0 deletions
diff --git a/ByteBuffer.cpp b/ByteBuffer.cpp
new file mode 100644
index 0000000..9714c8c
--- /dev/null
+++ b/ByteBuffer.cpp
@@ -0,0 +1,38 @@
+#include "ByteBuffer.h"
+#include <stdexcept>
+
+using namespace std;
+
+ByteBuffer::ByteBuffer(uint8_t *bytes, ssize_t size, ssize_t zero) :
+        bytes(bytes), size(size), ptr(zero), zero(zero) {
+}
+
+ByteBuffer &ByteBuffer::add8(uint8_t value) {
+    canAccessNextBytes(1);
+    bytes[zero + ptr++] = value;
+    return *this;
+}
+
+ByteBuffer &ByteBuffer::add16le(uint16_t value) {
+    canAccessNextBytes(2);
+    bytes[zero + ptr++] = (uint8_t) (value & 0xff);
+    bytes[zero + ptr++] = (uint8_t) ((value >> 8) & 0xff);
+    return *this;
+}
+
+uint8_t ByteBuffer::get8(ssize_t index) {
+    canAccessIndex(index);
+    return bytes[zero + ptr];
+}
+
+void ByteBuffer::canAccessNextBytes(ssize_t newBytes) {
+    if (zero + ptr + newBytes >= size) {
+        throw exception();
+    }
+}
+
+void ByteBuffer::canAccessIndex(ssize_t index) {
+    if (zero + index >= size) {
+        throw exception();
+    }
+}