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|
/*****************************************************************
|
| AP4 - Data Buffer
|
| Copyright 2002-2008 Axiomatic Systems, LLC
|
|
| This file is part of Bento4/AP4 (MP4 Atom Processing Library).
|
| Unless you have obtained Bento4 under a difference license,
| this version of Bento4 is Bento4|GPL.
| Bento4|GPL is free software; you can redistribute it and/or modify
| it under the terms of the GNU General Public License as published by
| the Free Software Foundation; either version 2, or (at your option)
| any later version.
|
| Bento4|GPL is distributed in the hope that it will be useful,
| but WITHOUT ANY WARRANTY; without even the implied warranty of
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
| GNU General Public License for more details.
|
| You should have received a copy of the GNU General Public License
| along with Bento4|GPL; see the file COPYING. If not, write to the
| Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
| 02111-1307, USA.
|
****************************************************************/
/*----------------------------------------------------------------------
| includes
+---------------------------------------------------------------------*/
#include "Ap4DataBuffer.h"
#include "Ap4Utils.h"
/*----------------------------------------------------------------------
| AP4_DataBuffer::AP4_DataBuffer
+---------------------------------------------------------------------*/
AP4_DataBuffer::AP4_DataBuffer() :
m_BufferIsLocal(true),
m_Buffer(NULL),
m_BufferSize(0),
m_DataSize(0)
{
}
/*----------------------------------------------------------------------
| AP4_DataBuffer::AP4_DataBuffer
+---------------------------------------------------------------------*/
AP4_DataBuffer::AP4_DataBuffer(AP4_Size buffer_size) :
m_BufferIsLocal(true),
m_Buffer(NULL),
m_BufferSize(buffer_size),
m_DataSize(0)
{
m_Buffer = new AP4_Byte[buffer_size];
}
/*----------------------------------------------------------------------
| AP4_DataBuffer::AP4_DataBuffer
+---------------------------------------------------------------------*/
AP4_DataBuffer::AP4_DataBuffer(const void* data, AP4_Size data_size) :
m_BufferIsLocal(true),
m_Buffer(NULL),
m_BufferSize(data_size),
m_DataSize(data_size)
{
if (data && data_size) {
m_Buffer = new AP4_Byte[data_size];
AP4_CopyMemory(m_Buffer, data, data_size);
}
}
/*----------------------------------------------------------------------
| AP4_DataBuffer::AP4_DataBuffer
+---------------------------------------------------------------------*/
AP4_DataBuffer::AP4_DataBuffer(const AP4_DataBuffer& other) :
m_BufferIsLocal(true),
m_Buffer(NULL),
m_BufferSize(other.m_DataSize),
m_DataSize(other.m_DataSize)
{
m_Buffer = new AP4_Byte[m_BufferSize];
AP4_CopyMemory(m_Buffer, other.m_Buffer, m_BufferSize);
}
/*----------------------------------------------------------------------
| AP4_DataBuffer::~AP4_DataBuffer
+---------------------------------------------------------------------*/
AP4_DataBuffer::~AP4_DataBuffer()
{
if (m_BufferIsLocal) {
delete[] m_Buffer;
}
}
/*----------------------------------------------------------------------
| AP4_DataBuffer::Reserve
+---------------------------------------------------------------------*/
AP4_Result
AP4_DataBuffer::Reserve(AP4_Size size)
{
if (size <= m_BufferSize) return AP4_SUCCESS;
// try doubling the buffer to accomodate for the new size
AP4_Size new_size = m_BufferSize*2+1024;
if (new_size < size) new_size = size;
return SetBufferSize(new_size);
}
/*----------------------------------------------------------------------
| AP4_DataBuffer::SetBuffer
+---------------------------------------------------------------------*/
AP4_Result
AP4_DataBuffer::SetBuffer(AP4_Byte* buffer, AP4_Size buffer_size)
{
if (m_BufferIsLocal) {
// destroy the local buffer
delete[] m_Buffer;
}
// we're now using an external buffer
m_BufferIsLocal = false;
m_Buffer = buffer;
m_BufferSize = buffer_size;
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_DataBuffer::SetBufferSize
+---------------------------------------------------------------------*/
AP4_Result
AP4_DataBuffer::SetBufferSize(AP4_Size buffer_size)
{
if (m_BufferIsLocal) {
return ReallocateBuffer(buffer_size);
} else {
return AP4_FAILURE; // you cannot change the
// buffer management mode
}
}
/*----------------------------------------------------------------------
| AP4_DataBuffer::SetDataSize
+---------------------------------------------------------------------*/
AP4_Result
AP4_DataBuffer::SetDataSize(AP4_Size size)
{
if (size > m_BufferSize) {
if (m_BufferIsLocal) {
AP4_Result result = ReallocateBuffer(size);
if (AP4_FAILED(result)) return result;
} else {
return AP4_FAILURE;
}
}
m_DataSize = size;
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_DataBuffer::SetData
+---------------------------------------------------------------------*/
AP4_Result
AP4_DataBuffer::SetData(const AP4_Byte* data, AP4_Size size)
{
if (size > m_BufferSize) {
if (m_BufferIsLocal) {
AP4_Result result = ReallocateBuffer(size);
if (AP4_FAILED(result)) return result;
} else {
return AP4_FAILURE;
}
}
AP4_CopyMemory(m_Buffer, data, size);
m_DataSize = size;
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_DataBuffer::AppendData
+---------------------------------------------------------------------*/
AP4_Result
AP4_DataBuffer::AppendData(const AP4_Byte* data, AP4_Size data_size)
{
if (data == NULL || data_size == 0) {
return AP4_SUCCESS;
}
AP4_Size existing_size = m_DataSize;
AP4_Result result = SetDataSize(existing_size+data_size);
if (AP4_FAILED(result)) {
return result;
}
AP4_CopyMemory(m_Buffer+existing_size, data, data_size);
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_DataBuffer::ReallocateBuffer
+---------------------------------------------------------------------*/
AP4_Result
AP4_DataBuffer::ReallocateBuffer(AP4_Size size)
{
// check that the existing data fits
if (m_DataSize > size) return AP4_FAILURE;
// allocate a new buffer
AP4_Byte* new_buffer = new AP4_Byte[size];
// copy the contents of the previous buffer ,is any
if (m_Buffer && m_DataSize) {
AP4_CopyMemory(new_buffer, m_Buffer, m_DataSize);
}
// destroy the previous buffer
delete[] m_Buffer;
// use the new buffer
m_Buffer = new_buffer;
m_BufferSize = size;
return AP4_SUCCESS;
}
|
