From: David ‘Bombe’ Roden <bombe@pterodactylus.net>
Date: Sat, 5 Jul 2008 12:55:11 +0000 (+0200)
Subject: use different type for pointer arithmetic
X-Git-Tag: 0.1~51
X-Git-Url: https://git.pterodactylus.net/?a=commitdiff_plain;h=6cdb1a3a8775e9816948c9366c75d212fbd986c4;p=ecparse.git

use different type for pointer arithmetic
add method to discard everything before the current position
---

diff --git a/GrowingBuffer.cpp b/GrowingBuffer.cpp
index 492f244..602084c 100644
--- a/GrowingBuffer.cpp
+++ b/GrowingBuffer.cpp
@@ -4,6 +4,7 @@
 
 #include <stdlib.h>
 #include <string.h>
+#include <stddef.h>
 #include "GrowingBuffer.h"
 
 GrowingBuffer::GrowingBuffer(size_t initialSize) {
@@ -37,7 +38,7 @@ void GrowingBuffer::seek(size_t position) {
 
 void* GrowingBuffer::read(void* buffer, size_t length) {
 	size_t bytesToCopy = (length > (limit - position)) ? (limit - position) : length;
-	memcpy(buffer, (char*) data + position, bytesToCopy);
+	memcpy(buffer, (ptrdiff_t*) data + position, bytesToCopy);
 	position += bytesToCopy;
 	return buffer;
 }
@@ -53,7 +54,13 @@ void GrowingBuffer::write(const void* buffer, size_t length) {
 		free(data);
 		data = newData;
 	}
-	memcpy((char*) data + position, buffer, length);
+	memcpy((ptrdiff_t*) data + position, buffer, length);
+}
+
+void GrowingBuffer::cut() {
+	memcpy(data, (ptrdiff_t*) data + position, position);
+	limit = position;
+	position = 0;
 }
 
 void GrowingBuffer::truncate() {
diff --git a/GrowingBuffer.h b/GrowingBuffer.h
index 894267d..3efa30d 100644
--- a/GrowingBuffer.h
+++ b/GrowingBuffer.h
@@ -37,6 +37,7 @@ public:
 	void seek(size_t position);
 	void* read(void* buffer, size_t length);
 	void write(const void* buffer, size_t length);
+	void cut();
 	void truncate();
 	void clear();
 	void resize(double factor = 1.0);