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 __ADDRESS_SPACE_STREAM_H 17 #define __ADDRESS_SPACE_STREAM_H 18 19 #include "IOStream.h" 20 21 #include "address_space_graphics_types.h" 22 #include "goldfish_address_space.h" 23 24 class AddressSpaceStream; 25 26 AddressSpaceStream* createAddressSpaceStream(size_t bufSize); 27 28 class AddressSpaceStream : public IOStream { 29 public: 30 explicit AddressSpaceStream( 31 address_space_handle_t handle, 32 uint32_t version, 33 struct asg_context context, 34 uint64_t ringOffset, 35 uint64_t writeBufferOffset); 36 ~AddressSpaceStream(); 37 38 virtual size_t idealAllocSize(size_t len); 39 virtual void *allocBuffer(size_t minSize); 40 virtual int commitBuffer(size_t size); 41 virtual const unsigned char *readFully( void *buf, size_t len); 42 virtual const unsigned char *read( void *buf, size_t *inout_len); 43 virtual int writeFully(const void *buf, size_t len); 44 virtual const unsigned char *commitBufferAndReadFully(size_t size, void *buf, size_t len); 45 46 private: 47 bool isInError() const; 48 ssize_t speculativeRead(unsigned char* readBuffer, size_t trySize); 49 void notifyAvailable(); 50 uint32_t getRelativeBufferPos(uint32_t pos); 51 void advanceWrite(); 52 void ensureConsumerFinishing(); 53 void ensureType1Finished(); 54 void ensureType3Finished(); 55 int type1Write(uint32_t offset, size_t size); 56 57 unsigned char* m_tmpBuf; 58 size_t m_tmpBufSize; 59 size_t m_tmpBufXferSize; 60 bool m_usingTmpBuf; 61 62 unsigned char* m_readBuf; 63 size_t m_read; 64 size_t m_readLeft; 65 66 address_space_handle_t m_handle; 67 uint32_t m_version; 68 struct asg_context m_context; 69 70 uint64_t m_ringOffset; 71 uint64_t m_writeBufferOffset; 72 73 uint32_t m_writeBufferSize; 74 uint32_t m_writeBufferMask; 75 unsigned char* m_buf; 76 unsigned char* m_writeStart; 77 uint32_t m_writeStep; 78 79 uint32_t m_notifs; 80 uint32_t m_written; 81 }; 82 83 #endif 84