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/*
* Copyright (C) 2020 The Android Open Source Project
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <algorithm>
#include "diskio.h"
using namespace std;
int DiskIO::OpenForRead(const unsigned char* data, size_t size) {
this->data = data;
this->size = size;
this->off = 0;
this->isOpen = 1;
this->openForWrite = 0;
return 1;
}
void DiskIO::MakeRealName(void) {
realFilename = userFilename;
}
int DiskIO::OpenForRead(void) {
return 1;
}
int DiskIO::OpenForWrite(void) {
return 1;
}
void DiskIO::Close(void) {
}
int DiskIO::GetBlockSize(void) {
return 512;
}
int DiskIO::GetPhysBlockSize(void) {
return 512;
}
uint32_t DiskIO::GetNumHeads(void) {
return 255;
}
uint32_t DiskIO::GetNumSecsPerTrack(void) {
return 63;
}
int DiskIO::DiskSync(void) {
return 1;
}
int DiskIO::Seek(uint64_t sector) {
off_t off = sector * GetBlockSize();
if (off >= this->size) {
return 0;
} else {
this->off = off;
return 1;
}
}
int DiskIO::Read(void* buffer, int numBytes) {
int actualBytes = std::min(static_cast<int>(this->size - this->off), numBytes);
memcpy(buffer, this->data + this->off, actualBytes);
return actualBytes;
}
int DiskIO::Write(void*, int) {
return 0;
}
uint64_t DiskIO::DiskSize(int *) {
return this->size / GetBlockSize();
}
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