RASCSI/src_old/raspberrypi/disk_image/disk_image_handle.cpp

60 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;
}