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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __IO_STREAM_H__
#define __IO_STREAM_H__
#include <stdlib.h>
#include <stdio.h>
#include "ErrorLog.h"
class IOStream {
public:
IOStream(size_t bufSize) {
m_iostreamBuf = NULL;
m_bufsize = bufSize;
m_free = 0;
}
virtual size_t idealAllocSize(size_t len) {
return m_bufsize < len ? len : m_bufsize;
}
virtual void *allocBuffer(size_t minSize) = 0;
virtual int commitBuffer(size_t size) = 0;
virtual const unsigned char *readFully( void *buf, size_t len) = 0;
virtual const unsigned char *commitBufferAndReadFully(size_t size, void *buf, size_t len) = 0;
virtual const unsigned char *read( void *buf, size_t *inout_len) = 0;
virtual int writeFully(const void* buf, size_t len) = 0;
virtual ~IOStream() {
// NOTE: m_iostreamBuf is 'owned' by the child class thus we expect it to be released by it
}
virtual unsigned char *alloc(size_t len) {
if (m_iostreamBuf && len > m_free) {
if (flush() < 0) {
ERR("Failed to flush in alloc\n");
return NULL; // we failed to flush so something is wrong
}
}
if (!m_iostreamBuf || len > m_bufsize) {
int allocLen = this->idealAllocSize(len);
m_iostreamBuf = (unsigned char *)allocBuffer(allocLen);
if (!m_iostreamBuf) {
ERR("Alloc (%u bytes) failed\n", allocLen);
return NULL;
}
m_bufsize = m_free = allocLen;
}
unsigned char *ptr;
ptr = m_iostreamBuf + (m_bufsize - m_free);
m_free -= len;
return ptr;
}
virtual int flush() {
if (!m_iostreamBuf || m_free == m_bufsize) return 0;
int stat = commitBuffer(m_bufsize - m_free);
m_iostreamBuf = NULL;
m_free = 0;
return stat;
}
const unsigned char *readback(void *buf, size_t len) {
if (m_iostreamBuf && m_free != m_bufsize) {
size_t size = m_bufsize - m_free;
m_iostreamBuf = NULL;
m_free = 0;
return commitBufferAndReadFully(size, buf, len);
}
return readFully(buf, len);
}
// These two methods are defined and used in GLESv2_enc. Any reference
// outside of GLESv2_enc will produce a link error. This is intentional
// (technical debt).
void readbackPixels(void* context, int width, int height, unsigned int format, unsigned int type, void* pixels);
void uploadPixels(void* context, int width, int height, unsigned int format, unsigned int type, const void* pixels);
private:
unsigned char *m_iostreamBuf;
size_t m_bufsize;
size_t m_free;
};
//
// When a client opens a connection to the renderer, it should
// send unsigned int value indicating the "clientFlags".
// The following are the bitmask of the clientFlags.
// currently only one bit is used which flags the server
// it should exit.
//
#define IOSTREAM_CLIENT_EXIT_SERVER 1
#endif
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