1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 #ifndef __IO_STREAM_H__ 17 #define __IO_STREAM_H__ 18 19 #include <stdlib.h> 20 #include <stdint.h> 21 #include <stdio.h> 22 23 #include "ErrorLog.h" 24 25 namespace gfxstream { 26 namespace guest { 27 28 class IOStream { 29 public: 30 IOStream(size_t bufSize)31 IOStream(size_t bufSize) { 32 m_iostreamBuf = NULL; 33 m_bufsizeOrig = bufSize; 34 m_bufsize = bufSize; 35 m_free = 0; 36 m_refcount = 1; 37 } 38 incRef()39 void incRef() { 40 __atomic_add_fetch(&m_refcount, 1, __ATOMIC_SEQ_CST); 41 } 42 decRef()43 bool decRef() { 44 if (0 == __atomic_sub_fetch(&m_refcount, 1, __ATOMIC_SEQ_CST)) { 45 delete this; 46 return true; 47 } 48 return false; 49 } 50 idealAllocSize(size_t len)51 virtual size_t idealAllocSize(size_t len) { 52 return m_bufsize < len ? len : m_bufsize; 53 } 54 55 virtual void *allocBuffer(size_t minSize) = 0; 56 virtual int commitBuffer(size_t size) = 0; 57 virtual const unsigned char *readFully( void *buf, size_t len) = 0; 58 virtual const unsigned char *commitBufferAndReadFully(size_t size, void *buf, size_t len) = 0; 59 virtual const unsigned char *read( void *buf, size_t *inout_len) = 0; 60 virtual int writeFully(const void* buf, size_t len) = 0; writeFullyAsync(const void * buf,size_t len)61 virtual int writeFullyAsync(const void* buf, size_t len) { 62 return writeFully(buf, len); 63 } 64 ~IOStream()65 virtual ~IOStream() { 66 67 // NOTE: m_iostreamBuf is 'owned' by the child class thus we expect it to be released by it 68 } 69 alloc(size_t len)70 virtual unsigned char *alloc(size_t len) { 71 72 if (m_iostreamBuf && len > m_free) { 73 if (flush() < 0) { 74 ERR("Failed to flush in alloc\n"); 75 return NULL; // we failed to flush so something is wrong 76 } 77 } 78 79 if (!m_iostreamBuf || len > m_bufsize) { 80 size_t allocLen = this->idealAllocSize(len); 81 m_iostreamBuf = (unsigned char *)allocBuffer(allocLen); 82 if (!m_iostreamBuf) { 83 ERR("Alloc (%zu bytes) failed\n", allocLen); 84 return NULL; 85 } 86 m_bufsize = m_free = allocLen; 87 } 88 89 unsigned char *ptr; 90 91 ptr = m_iostreamBuf + (m_bufsize - m_free); 92 m_free -= len; 93 94 return ptr; 95 } 96 flush()97 virtual int flush() { 98 99 if (!m_iostreamBuf || m_free == m_bufsize) return 0; 100 101 int stat = commitBuffer(m_bufsize - m_free); 102 m_iostreamBuf = NULL; 103 m_free = 0; 104 return stat; 105 } 106 readback(void * buf,size_t len)107 const unsigned char *readback(void *buf, size_t len) { 108 if (m_iostreamBuf && m_free != m_bufsize) { 109 size_t size = m_bufsize - m_free; 110 m_iostreamBuf = NULL; 111 m_free = 0; 112 return commitBufferAndReadFully(size, buf, len); 113 } 114 return readFully(buf, len); 115 } 116 117 // These two methods are defined and used in GLESv2_enc. Any reference 118 // outside of GLESv2_enc will produce a link error. This is intentional 119 // (technical debt). 120 void readbackPixels(void* context, int width, int height, unsigned int format, unsigned int type, void* pixels); 121 void uploadPixels(void* context, int width, int height, int depth, unsigned int format, unsigned int type, const void* pixels); 122 123 124 protected: rewind()125 void rewind() { 126 m_iostreamBuf = NULL; 127 m_bufsize = m_bufsizeOrig; 128 m_free = 0; 129 } 130 131 private: 132 unsigned char *m_iostreamBuf; 133 size_t m_bufsizeOrig; 134 size_t m_bufsize; 135 size_t m_free; 136 uint32_t m_refcount; 137 }; 138 139 } // namespace guest 140 } // namespace gfxstream 141 142 // 143 // When a client opens a connection to the renderer, it should 144 // send unsigned int value indicating the "clientFlags". 145 // The following are the bitmask of the clientFlags. 146 // currently only one bit is used which flags the server 147 // it should exit. 148 // 149 #define IOSTREAM_CLIENT_EXIT_SERVER 1 150 151 #endif 152