mirror of
https://github.com/akuker/RASCSI.git
synced 2024-06-06 22:29:30 +00:00
55 lines
1.1 KiB
C++
55 lines
1.1 KiB
C++
//---------------------------------------------------------------------------
|
|
//
|
|
// SCSI Target Emulator RaSCSI (*^..^*)
|
|
// for Raspberry Pi
|
|
//
|
|
// Copyright (C) 2022 akuker
|
|
//
|
|
// Base class for interfacing with disk images.
|
|
//
|
|
// [ DiskImageHandle ]
|
|
//
|
|
//---------------------------------------------------------------------------
|
|
|
|
#include "disk_image/disk_image_handle.h"
|
|
|
|
DiskImageHandle::DiskImageHandle(const Filepath& path, int size, uint32_t blocks, off_t imgoff){
|
|
|
|
serial = 0;
|
|
sec_path = path;
|
|
sec_size = size;
|
|
sec_blocks = blocks;
|
|
imgoffset = imgoff;
|
|
}
|
|
DiskImageHandle::~DiskImageHandle(){
|
|
|
|
}
|
|
|
|
|
|
off_t DiskImageHandle::GetSectorOffset(int block){
|
|
|
|
int sector_num = block & 0xff;
|
|
return (off_t)sector_num << sec_size;
|
|
}
|
|
|
|
off_t DiskImageHandle::GetTrackOffset(int block){
|
|
|
|
// Assuming that all tracks hold 256 sectors
|
|
int track_num = block >> 8;
|
|
|
|
// Calculate offset (previous tracks are considered to hold 256 sectors)
|
|
off_t offset = ((off_t)track_num << 8);
|
|
if (cd_raw) {
|
|
ASSERT(sec_size == 11);
|
|
offset *= 0x930;
|
|
offset += 0x10;
|
|
} else {
|
|
offset <<= sec_size;
|
|
}
|
|
|
|
// Add offset to real image
|
|
offset += imgoffset;
|
|
|
|
return offset;
|
|
}
|