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growbuf.cpp

/*
 * growbuf.cpp
 * 
 * This file is a part of NSIS.
 * 
 * Copyright (C) 1999-2009 Nullsoft and Contributors
 * 
 * Licensed under the zlib/libpng license (the "License");
 * you may not use this file except in compliance with the License.
 * 
 * Licence details can be found in the file COPYING.
 * 
 * This software is provided 'as-is', without any express or implied
 * warranty.
 */

#include "growbuf.h"

#include <cstdlib> // for malloc/free
#include <cstring> // for memcpy
#include <cstdio> // for f*
#include <algorithm> // for std::min

#include "Platform.h"

using namespace std;

GrowBuf::GrowBuf() { m_alloc=m_used=m_zero=0; m_s=NULL; m_bs=32768; }
GrowBuf::~GrowBuf() { free(m_s); }

void GrowBuf::set_zeroing(int zero) { m_zero=zero; }

int GrowBuf::add(const void *data, int len)
{
  if (len<=0) return 0;
  resize(m_used+len);
  memcpy((char*)m_s+m_used-len,data,len);
  return m_used-len;
}

void GrowBuf::resize(int newlen)
{
  int os=m_alloc;
  int ou=m_used;
  m_used=newlen;
  if (newlen > m_alloc)
  {
    void *n;
    m_alloc = newlen*2 + m_bs;
    n = realloc(m_s, m_alloc);
    if (!n)
    {
      extern FILE *g_output;
      extern int g_display_errors;
      if (g_display_errors)
      {
        fprintf(g_output,"\nack! realloc(%d) failed, trying malloc(%d)!\n",m_alloc,newlen);
        fflush(g_output);
      }
      m_alloc=newlen; // try to malloc the minimum needed
      n=malloc(m_alloc);
      if (!n)
      {
        extern void quit();
        if (g_display_errors)
        {
          fprintf(g_output,"\nInternal compiler error #12345: GrowBuf realloc/malloc(%d) failed.\n",m_alloc);
          fflush(g_output);
        }
        quit();
      }
      memcpy(n,m_s,min(newlen,os));
      free(m_s);
    }
    m_s=n;
  }
  if (m_zero && m_used > ou)
    memset((char*)m_s + ou, 0, m_used - ou);
  if (!m_used && m_alloc > 2*m_bs) // only free if you resize to 0 and we're > 64k
  {
    m_alloc=0;
    free(m_s);
    m_s=NULL;
  }
}

int GrowBuf::getlen() const { return m_used; }
void *GrowBuf::get() const { return m_s; }

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