static inline void setCheck(size32_t size, void * _ptr)
{
byte * ptr = static_cast<byte *>(_ptr);
size32_t capacity = RoxieRowCapacity(ptr);
memset(ptr+size, 0, capacity - size - extraSize);
unsigned short * check = reinterpret_cast<unsigned short *>(ptr + capacity - extraSize);
*check = chksum16(ptr, capacity-extraSize);
}
static inline void setCheck(size32_t size, void * _ptr)
{
byte * ptr = static_cast<byte *>(_ptr);
memsize_t capacity = RoxieRowCapacity(ptr);
if (capacity < size + extraSize)
throw MakeStringException(0, "Data was written past the end of the row - allocated %d, written %d", (size32_t)(capacity - extraSize), size);
memset(ptr+size, 0, capacity - size - extraSize);
unsigned short * check = reinterpret_cast<unsigned short *>(ptr + capacity - extraSize);
*check = chksum16(ptr, capacity-extraSize);
}
static inline bool isValid(const void * _ptr)
{
if (RoxieRowHasDestructor(_ptr))
{
const byte * ptr = static_cast<const byte *>(_ptr);
memsize_t capacity = RoxieRowCapacity(ptr);
const unsigned short * check = reinterpret_cast<const unsigned short *>(ptr + capacity - extraSize);
return chksum16(ptr, capacity-extraSize) == *check;
}
return true;
}
/* write data to sector */
static imgtoolerr_t vzdos_write_sector_data(imgtool_image *img, int track, int sector, UINT8 *data)
{
int ret, data_start;
UINT8 buffer[DATA_SIZE + 4]; /* data + checksum */
ret = vzdos_get_data_start(img, track, sector, &data_start);
if (ret) return (imgtoolerr_t)ret;
memcpy(buffer, data, DATA_SIZE + 2);
place_integer_le(buffer, DATA_SIZE + 2, 2, chksum16(data, DATA_SIZE + 2));
ret = floppy_write_sector(imgtool_floppy(img), 0, track, sector_order[sector], data_start, buffer, sizeof(buffer), 0); /* TODO: pass ddam argument from imgtool */
if (ret) return (imgtoolerr_t)ret;
return IMGTOOLERR_SUCCESS;
}
/* return the actual data of a sector */
static imgtoolerr_t vzdos_read_sector_data(imgtool_image *img, int track, int sector, UINT8 *data)
{
int ret, data_start;
UINT8 buffer[DATA_SIZE + 4]; /* data + checksum */
ret = vzdos_get_data_start(img, track, sector, &data_start);
if (ret) return (imgtoolerr_t)ret;
ret = floppy_read_sector(imgtool_floppy(img), 0, track, sector_order[sector], data_start, &buffer, sizeof(buffer));
if (ret) return (imgtoolerr_t)ret;
/* verify sector checksums */
if (pick_integer_le(buffer, DATA_SIZE + 2, 2) != chksum16(buffer, DATA_SIZE + 2))
return IMGTOOLERR_CORRUPTFILE;
memcpy(data, &buffer, DATA_SIZE + 2);
return IMGTOOLERR_SUCCESS;
}
