From b55df0b8e46f46fea4d69f98a729cd237d77a6ed Mon Sep 17 00:00:00 2001
From: Trygve Laugstøl <trygvis@inamo.no>
Date: Tue, 10 Feb 2015 21:29:19 +0100
Subject: o wip.

---
 ByteBuffer.cpp | 54 +++++++++++++++++++++++++++++++++++++++---------------
 1 file changed, 39 insertions(+), 15 deletions(-)

(limited to 'ByteBuffer.cpp')

diff --git a/ByteBuffer.cpp b/ByteBuffer.cpp
index 9714c8c..70b9a8e 100644
--- a/ByteBuffer.cpp
+++ b/ByteBuffer.cpp
@@ -1,38 +1,62 @@
 #include "ByteBuffer.h"
-#include <stdexcept>
+#include <stdint-gcc.h>
+#include <string.h>
 
 using namespace std;
 
-ByteBuffer::ByteBuffer(uint8_t *bytes, ssize_t size, ssize_t zero) :
-        bytes(bytes), size(size), ptr(zero), zero(zero) {
+ByteBuffer::ByteBuffer(uint8_t *bytes, size_t capacity, size_t size, size_t zero) :
+        bytes(bytes), capacity(capacity), size(size), cursor(zero), zero(zero) {
 }
 
 ByteBuffer &ByteBuffer::add8(uint8_t value) {
-    canAccessNextBytes(1);
-    bytes[zero + ptr++] = value;
+    checkAndUpdateSize(1);
+    bytes[zero + cursor++] = 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);
+    checkAndUpdateSize(2);
+    bytes[zero + cursor++] = (uint8_t) (value & 0xff);
+    bytes[zero + cursor++] = (uint8_t) ((value >> 8) & 0xff);
     return *this;
 }
 
-uint8_t ByteBuffer::get8(ssize_t index) {
+uint8_t ByteBuffer::get8(size_t index) {
     canAccessIndex(index);
-    return bytes[zero + ptr];
+    return bytes[zero + cursor];
 }
 
-void ByteBuffer::canAccessNextBytes(ssize_t newBytes) {
-    if (zero + ptr + newBytes >= size) {
-        throw exception();
+uint8_t ByteBuffer::get8() {
+    canAccessIndex(cursor);
+    return bytes[zero + cursor++];
+}
+
+uint16_t ByteBuffer::get16le() {
+    canAccessIndex(cursor + 1);
+    uint16_t value;
+    value = bytes[zero + cursor++];
+    value = ((uint16_t) bytes[zero + cursor++]) << 8;
+    return value;
+}
+
+void ByteBuffer::copy(uint8_t *bytes, size_t length) {
+    canAccessIndex(cursor + length);
+
+    memcpy(bytes, &this->bytes[zero + cursor], length);
+    cursor += length;
+}
+
+void ByteBuffer::checkAndUpdateSize(size_t newBytes) {
+    size_t newSize = zero + cursor + newBytes;
+    if (newSize >= capacity) {
+        throw ByteBufferException(string("Out of bounds! zero=") + to_string(zero) + ", cursor=" + to_string(cursor) + ", size=" + to_string(size) + ", capacity=" + to_string(capacity) + ", newSize=" + to_string(newSize));
     }
+
+    size = max(newSize, size);
 }
 
-void ByteBuffer::canAccessIndex(ssize_t index) {
+void ByteBuffer::canAccessIndex(size_t index) {
     if (zero + index >= size) {
-        throw exception();
+        throw ByteBufferException(string("Out of bounds! zero=") + to_string(zero) + ", index=" + to_string(index) + ", size=" + to_string(size));
     }
 }
-- 
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