6208854726
In case we're receiving packets larger then the initial size of the read buffer, we dynamicaly grow (X2 steps) the size of the buffer. An example for this large buffer is a 4MB texture in JetCarStunts. Change-Id: I167caddb731583811c009321d4f8fb2f7eea032c
74 lines
1.9 KiB
C++
74 lines
1.9 KiB
C++
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "ReadBuffer.h"
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#include <string.h>
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#include <assert.h>
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#include <limits.h>
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#include "ErrorLog.h"
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ReadBuffer::ReadBuffer(IOStream *stream, size_t bufsize)
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{
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m_size = bufsize;
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m_stream = stream;
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m_buf = (unsigned char*)malloc(m_size*sizeof(unsigned char));
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m_validData = 0;
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m_readPtr = m_buf;
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}
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ReadBuffer::~ReadBuffer()
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{
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free(m_buf);
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}
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int ReadBuffer::getData()
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{
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if ((m_validData > 0) && (m_readPtr > m_buf)) {
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memcpy(m_buf, m_readPtr, m_validData);
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}
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// get fresh data into the buffer;
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size_t len = m_size - m_validData;
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if (len==0) {
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//we need to inc our buffer
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size_t new_size = m_size*2;
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unsigned char* new_buf;
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if (new_size < m_size) { // overflow check
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new_size = INT_MAX;
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}
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new_buf = (unsigned char*)realloc(m_buf, new_size);
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if (!new_buf) {
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ERR("Failed to alloc %d bytes for ReadBuffer\n", new_size);
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return -1;
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}
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m_size = new_size;
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m_buf = new_buf;
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len = m_size - m_validData;
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}
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m_readPtr = m_buf;
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if (NULL != m_stream->read(m_buf + m_validData, &len)) {
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m_validData += len;
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return len;
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}
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return -1;
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}
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void ReadBuffer::consume(size_t amount)
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{
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assert(amount <= m_validData);
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m_validData -= amount;
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m_readPtr += amount;
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}
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