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path: root/src/lib/lib7z/7zBuf2.c
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/* 7zBuf2.c -- Byte Buffer
2008-10-04 : Igor Pavlov : Public domain */

#include <string.h>
#include "7zBuf.h"

void DynBuf_Construct(CDynBuf *p)
{
	p->data = 0;
	p->size = 0;
	p->pos = 0;
}

void DynBuf_SeekToBeg(CDynBuf *p)
{
	p->pos = 0;
}

int DynBuf_Write(CDynBuf *p, const Byte *buf, size_t size, ISzAlloc *alloc)
{
	if (size > p->size - p->pos)
	{
	size_t newSize = p->pos + size;
	Byte *data;
	newSize += newSize / 4;
	data = (Byte *)alloc->Alloc(alloc, newSize);
	if (data == 0)
		return 0;
	p->size = newSize;
	memcpy(data, p->data, p->pos);
	alloc->Free(alloc, p->data);
	p->data = data;
	}
	memcpy(p->data + p->pos, buf, size);
	p->pos += size;
	return 1;
}

void DynBuf_Free(CDynBuf *p, ISzAlloc *alloc)
{
	alloc->Free(alloc, p->data);
	p->data = 0;
	p->size = 0;
	p->pos = 0;
}