--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/databuffer.h Mon Jul 16 16:15:16 2012 +0300
@@ -0,0 +1,125 @@
+/*
+ * botc source code
+ * Copyright (C) 2012 Santeri `Dusk` Piippo
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. Neither the name of the developer nor the names of its contributors may
+ * be used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ * 4. Redistributions in any form must be accompanied by information on how to
+ * obtain complete source code for the software and any accompanying
+ * software that uses the software. The source code must either be included
+ * in the distribution or be available for no more than the cost of
+ * distribution plus a nominal fee, and must be freely redistributable
+ * under reasonable conditions. For an executable file, complete source
+ * code means the source code for all modules it contains. It does not
+ * include source code for modules or files that typically accompany the
+ * major components of the operating system on which the executable file
+ * runs.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __DATABUFFER_H__
+#define __DATABUFFER_H__
+#include <stdio.h>
+#include <string.h>
+#include "common.h"
+
+// ============================================================================
+// DataBuffer: A dynamic data buffer.
+class DataBuffer {
+public:
+ // The actual buffer
+ unsigned char* buffer;
+
+ // Allocated size of the buffer
+ unsigned int allocsize;
+
+ // Written size of the buffer
+ unsigned int writesize;
+
+ // METHODS
+ DataBuffer (unsigned int size=128) {
+ writesize = 0;
+
+ buffer = new unsigned char[size];
+ allocsize = size;
+ }
+
+ ~DataBuffer () {
+ delete buffer;
+ }
+
+ template<class T> void Write(T stuff) {
+ if (sizeof (char) != 1) {
+ error ("DataBuffer: sizeof(char) must be 1!\n");
+ }
+
+ // Out of space, must resize
+ if (writesize + sizeof(T) >= allocsize) {
+ // First, store the old buffer temporarily
+ char* copy = new char[allocsize];
+ memcpy (copy, buffer, allocsize);
+
+ // Remake the buffer with the new size.
+ // Have a bit of leeway so we don't have to
+ // resize immediately again.
+ size_t newsize = allocsize + sizeof (T) + 128;
+ delete buffer;
+ buffer = new unsigned char[newsize];
+ allocsize = newsize;
+
+ // Now, copy the new stuff over.
+ memcpy (buffer, copy, allocsize);
+
+ // Nuke the copy now as it's no longer needed
+ delete copy;
+ }
+
+ // Write the new stuff one byte at a time
+ for (unsigned int x = 0; x < sizeof (T); x++) {
+ if (writesize >= allocsize)
+ error ("DataBuffer: written size exceeds allocated size!\n");
+ buffer[writesize] = CharByte<T> (stuff, x);
+ writesize++;
+ }
+ }
+
+private:
+ template <class T> unsigned char CharByte (T a, unsigned int b) {
+ if (b >= sizeof (T))
+ error ("CharByte: tried to get byte %u out of a %u-byte %s\n",
+ b, sizeof (T), typeid(T).name());
+
+ unsigned long p1 = pow<unsigned long> (256, b);
+ unsigned long p2 = pow<unsigned long> (256, b+1);
+ unsigned long r = (a % p2) / p1;
+
+ if (r > 256)
+ error ("result %lu too big!", r);
+
+ unsigned char ur = static_cast<unsigned char> (r);
+ return ur;
+ }
+};
+
+#endif // __DATABUFFER_H__
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