关于INT13H EXT的数据结构及操作见：
http://zli.webspace4free.biz/page5.html /**
* 硬盘操作："读"操作(0x42)，"写"操作(0x43),\n
* "cmd" must be Diskread(0x42) or Diskwrite(0x43).
* @return >=0: 成功,读写的数据块数;
* @return -1: 失败.
*/
short _diskop (unsigned char drv, unsigned char cmd,
unsigned char * buffer, unsigned long startlow, unsigned short copyblks)
{
/* 磁盘存取数据包结构 */
struct disk_address_packet {
unsigned char size_of_packet;
unsigned char reserved;
unsigned short number_of_blocks_to_transfer;
unsigned short transfer_buffer_offset;
unsigned short transfer_buffer_segment;
unsigned long starting_absolute_block_low;
unsigned long starting_absolute_block_high;
};
struct disk_address_packet dap;
unsigned char av; unsigned char * pt = (unsigned char *) &dap; dap.size_of_packet = sizeof (dap);
dap.reserved = 0;
dap.number_of_blocks_to_transfer = copyblks;
dap.transfer_buffer_offset = FP_OFF(buffer);
dap.transfer_buffer_segment = FP_SEG(buffer);
dap.starting_absolute_block_low = startlow;
dap.starting_absolute_block_high = 0; /* 忽略高位 */ asm {
push ds
push si
mov ah, cmd
mov dl, drv
lds si, DWORD PTR pt
int 13h
pop si
pop ds
mov av, ah
jc error
}
return (dap.number_of_blocks_to_transfer); error:
ErrorNum = av;
return (-1); }
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