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146 lines
4.2 KiB
146 lines
4.2 KiB
/*
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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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#ifndef __IO_STREAM_H__
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#define __IO_STREAM_H__
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#include <stdlib.h>
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#include <stdint.h>
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#include <stdio.h>
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#include "ErrorLog.h"
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class IOStream {
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public:
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IOStream(size_t bufSize) {
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m_iostreamBuf = NULL;
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m_bufsizeOrig = bufSize;
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m_bufsize = bufSize;
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m_free = 0;
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m_refcount = 1;
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}
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void incRef() {
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__atomic_add_fetch(&m_refcount, 1, __ATOMIC_SEQ_CST);
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}
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bool decRef() {
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if (0 == __atomic_sub_fetch(&m_refcount, 1, __ATOMIC_SEQ_CST)) {
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delete this;
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return true;
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}
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return false;
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}
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virtual size_t idealAllocSize(size_t len) {
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return m_bufsize < len ? len : m_bufsize;
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}
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virtual void *allocBuffer(size_t minSize) = 0;
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virtual int commitBuffer(size_t size) = 0;
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virtual const unsigned char *readFully( void *buf, size_t len) = 0;
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virtual const unsigned char *commitBufferAndReadFully(size_t size, void *buf, size_t len) = 0;
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virtual const unsigned char *read( void *buf, size_t *inout_len) = 0;
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virtual int writeFully(const void* buf, size_t len) = 0;
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virtual int writeFullyAsync(const void* buf, size_t len) {
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return writeFully(buf, len);
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}
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virtual ~IOStream() {
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// NOTE: m_iostreamBuf is 'owned' by the child class thus we expect it to be released by it
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}
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virtual unsigned char *alloc(size_t len) {
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if (m_iostreamBuf && len > m_free) {
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if (flush() < 0) {
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ERR("Failed to flush in alloc\n");
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return NULL; // we failed to flush so something is wrong
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}
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}
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if (!m_iostreamBuf || len > m_bufsize) {
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int allocLen = this->idealAllocSize(len);
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m_iostreamBuf = (unsigned char *)allocBuffer(allocLen);
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if (!m_iostreamBuf) {
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ERR("Alloc (%u bytes) failed\n", allocLen);
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return NULL;
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}
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m_bufsize = m_free = allocLen;
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}
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unsigned char *ptr;
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ptr = m_iostreamBuf + (m_bufsize - m_free);
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m_free -= len;
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return ptr;
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}
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virtual int flush() {
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if (!m_iostreamBuf || m_free == m_bufsize) return 0;
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int stat = commitBuffer(m_bufsize - m_free);
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m_iostreamBuf = NULL;
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m_free = 0;
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return stat;
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}
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const unsigned char *readback(void *buf, size_t len) {
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if (m_iostreamBuf && m_free != m_bufsize) {
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size_t size = m_bufsize - m_free;
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m_iostreamBuf = NULL;
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m_free = 0;
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return commitBufferAndReadFully(size, buf, len);
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}
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return readFully(buf, len);
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}
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// These two methods are defined and used in GLESv2_enc. Any reference
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// outside of GLESv2_enc will produce a link error. This is intentional
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// (technical debt).
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void readbackPixels(void* context, int width, int height, unsigned int format, unsigned int type, void* pixels);
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void uploadPixels(void* context, int width, int height, int depth, unsigned int format, unsigned int type, const void* pixels);
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protected:
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void rewind() {
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m_iostreamBuf = NULL;
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m_bufsize = m_bufsizeOrig;
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m_free = 0;
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}
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private:
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unsigned char *m_iostreamBuf;
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size_t m_bufsizeOrig;
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size_t m_bufsize;
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size_t m_free;
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uint32_t m_refcount;
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};
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//
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// When a client opens a connection to the renderer, it should
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// send unsigned int value indicating the "clientFlags".
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// The following are the bitmask of the clientFlags.
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// currently only one bit is used which flags the server
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// it should exit.
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//
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#define IOSTREAM_CLIENT_EXIT_SERVER 1
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#endif
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