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113 lines
3.2 KiB
113 lines
3.2 KiB
7 months ago
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/*
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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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#pragma once
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#include "ErrorLog.h"
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#include "base/Stream.h"
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#include <assert.h>
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#include <inttypes.h>
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#include <stdlib.h>
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#include <stdio.h>
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class IOStream {
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protected:
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explicit IOStream(size_t bufSize) : m_bufsize(bufSize) {}
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~IOStream() {
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// NOTE: m_buf was owned by the child class thus we expect it to be
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// released before the object destruction.
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}
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public:
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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 int writeFully(const void* buf, size_t len) = 0;
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virtual const unsigned char *readFully( void *buf, size_t len) = 0;
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size_t read(void* buf, size_t bufLen) {
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if (!readRaw(buf, &bufLen)) {
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return 0;
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}
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return bufLen;
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}
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unsigned char* alloc(size_t len) {
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if (m_buf && 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_buf || len > m_bufsize) {
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int allocLen = m_bufsize < len ? len : m_bufsize;
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m_buf = (unsigned char *)allocBuffer(allocLen);
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if (!m_buf) {
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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 = m_buf + (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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int flush() {
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if (!m_buf || m_free == m_bufsize) return 0;
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int stat = commitBuffer(m_bufsize - m_free);
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m_buf = 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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flush();
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return readFully(buf, len);
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}
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void save(android::base::Stream* stream) {
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stream->putBe32(m_bufsize);
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stream->putBe32(m_free);
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stream->putByte(m_buf != nullptr);
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onSave(stream);
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}
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void load(android::base::Stream* stream) {
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m_bufsize = stream->getBe32();
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m_free = stream->getBe32();
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const bool haveBuf = stream->getByte();
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const auto buf = onLoad(stream);
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m_buf = haveBuf ? buf : nullptr;
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}
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virtual void* getDmaForReading(uint64_t guest_paddr) = 0;
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virtual void unlockDma(uint64_t guest_paddr) = 0;
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protected:
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virtual const unsigned char *readRaw(void *buf, size_t *inout_len) = 0;
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virtual void onSave(android::base::Stream* stream) = 0;
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virtual unsigned char* onLoad(android::base::Stream* stream) = 0;
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unsigned char* m_buf = nullptr;
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size_t m_bufsize;
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size_t m_free = 0;
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};
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