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/* 7zBuf2.c -- Byte Buffer

2017-04-03 : Igor Pavlov : Public domain */

#include "Precomp.h"

#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, ISzAllocPtr alloc)

{

if (size > p->size - p->pos)

{

size_t newSize = p->pos + size;

Byte *data;

newSize += newSize / 4;

data = (Byte *)ISzAlloc_Alloc(alloc, newSize);

if (!data)

return 0;

p->size = newSize;

if (p->pos != 0)

memcpy(data, p->data, p->pos);

ISzAlloc_Free(alloc, p->data);

p->data = data;

}

if (size != 0)

{

memcpy(p->data + p->pos, buf, size);

p->pos += size;

}

return 1;

}

void DynBuf_Free(CDynBuf *p, ISzAllocPtr alloc)

{

ISzAlloc_Free(alloc, p->data);

p->data = 0;

p->size = 0;

p->pos = 0;

}

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