1 /* 2 * Copyright (C) 2018 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 17 #pragma once 18 19 #include <cstdint> 20 #include <cstdio> 21 #include <cstdlib> 22 23 class IOStream { 24 public: IOStream(unsigned char * buf,size_t bufSize)25 IOStream(unsigned char* buf, size_t bufSize) : m_buf(buf), m_bufSize(bufSize) { 26 } 27 alloc(size_t len)28 unsigned char* alloc(size_t len) { 29 if (m_allocSize + len > m_bufSize) { 30 printf("Command response is too large.\n"); 31 return nullptr; 32 } 33 unsigned char* buf = m_buf + m_allocSize; 34 m_allocSize += len; 35 return buf; 36 } 37 flush()38 int flush() { 39 m_flushSize = m_allocSize; 40 return 0; 41 } 42 getDmaForReading(uint64_t guest_paddr)43 void* getDmaForReading(uint64_t guest_paddr) { 44 // GLDMA is not supported, so we don't have to implement this. Just keep 45 // a stub here to keep the generated decoder stubs happy 46 return nullptr; 47 } 48 unlockDma(uint64_t guest_paddr)49 void unlockDma(uint64_t guest_paddr) { 50 // GLDMA is not supported, so we don't have to implement this. Just keep 51 // a stub here to keep the generated decoder stubs happy 52 } 53 getFlushSize()54 size_t getFlushSize() { 55 return m_flushSize; 56 } 57 58 private: 59 size_t m_allocSize = 0U; 60 size_t m_flushSize = 0U; 61 unsigned char* m_buf; 62 size_t m_bufSize; 63 }; 64