📄 vvdriver.c
字号:
BS_buf_write_byte((uint8)(SEC_NUM_FAT >> 16));
BS_buf_write_byte((uint8)(SEC_NUM_FAT >> 24));
/* Ext Flags */
BS_buf_write_byte(0x00);
BS_buf_write_byte(0x00);
/* FS Version */
BS_buf_write_byte(0x00);
BS_buf_write_byte(0x00);
/* Root Cluster */
BS_buf_write_byte(0x02);
BS_buf_write_byte(0x00);
BS_buf_write_byte(0x00);
BS_buf_write_byte(0x00);
/*FSInfo sector */
BS_buf_write_byte(0x01);
BS_buf_write_byte(0x00);
/* Backup Boot Sector */
BS_buf_write_byte(0x06);
BS_buf_write_byte(0x00);
/* Reserved */
for (i = 12; i != 0; i--)
BS_buf_write_byte(0x00);
BS_buf_write_byte(0x80); /* Driver number : 0x00 for floopy, 0x80 for hard disks */
BS_buf_write_byte(0x00); /* not used */
BS_buf_write_byte(FAT_EXT_SIGN); /* extended boot signature */
BS_buf_write_byte(0x00); /* volume ID */
BS_buf_write_byte(0x00);
BS_buf_write_byte(0x00);
BS_buf_write_byte(0x00);
BS_buf_write_byte('V'); /* Volume Label */
BS_buf_write_byte('_');
BS_buf_write_byte('V');
BS_buf_write_byte('O');
BS_buf_write_byte('L');
BS_buf_write_byte('U');
BS_buf_write_byte('M');
BS_buf_write_byte('E');
BS_buf_write_byte(' ');
BS_buf_write_byte(' ');
BS_buf_write_byte(' ');
BS_buf_write_byte('F'); /* File System Type in ASCII */
BS_buf_write_byte('A');
BS_buf_write_byte('T');
BS_buf_write_byte('3');
BS_buf_write_byte('2');
BS_buf_write_byte(' ');
BS_buf_write_byte(' ');
BS_buf_write_byte(' ');
for (i = 0; i < 420; i++) /* Boot Code */
BS_buf_write_byte(0x00);
BS_buf_write_byte(0x55); /* Signature word */
BS_buf_write_byte(0xAA);
printf("\na-boot_sec_buf_index: %lu \n", boot_sec_buf_index);
/* FSInfo Sector */
BS_buf_write_byte(0x52); /* Lead Signature */
BS_buf_write_byte(0x52);
BS_buf_write_byte(0x61);
BS_buf_write_byte(0x41);
for (i = 0; i < 480; i++) /* Reserved */
{
BS_buf_write_byte(0x00);
}
BS_buf_write_byte(0x72); /* Structure signature */
BS_buf_write_byte(0x72);
BS_buf_write_byte(0x41);
BS_buf_write_byte(0x61);
BS_buf_write_byte((uint8)FREE_CLUS); /* Free cluster count */
BS_buf_write_byte((uint8)(FREE_CLUS >> 8));
BS_buf_write_byte((uint8)(FREE_CLUS >> 16));
BS_buf_write_byte((uint8)(FREE_CLUS >> 24));
BS_buf_write_byte(0x02); /* Next free cluster */
BS_buf_write_byte(0x00);
BS_buf_write_byte(0x00);
BS_buf_write_byte(0x00);
for (i = 12 / 4; i != 0; i--) /* Reserved */
{
BS_buf_write_byte(0x00);
BS_buf_write_byte(0x00);
BS_buf_write_byte(0x00);
BS_buf_write_byte(0x00);
}
BS_buf_write_byte(0x00); /* Trail signature */
BS_buf_write_byte(0x00);
BS_buf_write_byte(0x55);
BS_buf_write_byte(0xAA);
printf("\nb-boot_sec_buf_index: %lu \n", boot_sec_buf_index);
for (i = 510/2; i != 0; i--)
{
BS_buf_write_byte(0x00);
BS_buf_write_byte(0x00);
}
BS_buf_write_byte(0x55);
BS_buf_write_byte(0xAA);
printf("\nc-boot_sec_buf_index: %lu \n", boot_sec_buf_index);
fwrite(boot_sec_buf, 1, BOOT_SEC_BUF_SIZE, fp);
}while(0);
printf("done");
}
/* 格式化FAT表 */
printf("\nFormatting FAT entry ... ");
if(fseek(fp, ADDR_FAT, SEEK_SET) == 0)
{
uint8 buf[SIZE_SEC];
uint32 *fat_entry_buf, i;
memset(buf, 0, SIZE_SEC);
/* 将FAT表清零同时将数据区根目录首簇-第2簇也清零 */
for (i = 0; i < SEC_NUM_FAT*FAT_NUM + 1; i++)
fwrite(buf, 1, SIZE_SEC, fp);
/* 设置FAT表0、1、2这3个表项 */
fat_entry_buf = (uint32 *)&buf[0];
fat_entry_buf[0] = 0xffffff00 | HARD_DISK;
fat_entry_buf[1] = 0x0fffffff; /* end-of-file marker */
fat_entry_buf[2] = 0x0fffffff; /* 根目录占用了，无论有无设置label都要置此entry为EOF */
fseek(fp, ADDR_FAT, SEEK_SET); /* FAT1 */
fwrite(buf, 1, 3*32, fp);
fseek(fp, ADDR_FAT + SIZE_FAT, SEEK_SET); /* FAT2 */
fwrite(buf, 1, 3*32, fp);
/* 若设置了label的情况下还要在cluster2中添加label的dir结构体信息，没有label的则不用 */
printf("done");
}
else
{
printf("fail!");
ret = VOL_ERR;
goto EXIT;
}
printf("\n#Format info:");
printf("\n FAT_ENTRY_NUM: %d, FAT_NUM: %d, SIZE_DATA_DEF: %lu", FAT_ENTRY_NUM, FAT_NUM, SIZE_DATA_DEF);
printf("\n SEC_PER_CLUS: %d, SIZE_SEC: %d, SIZE_CLUS: %d", SEC_PER_CLUS, SIZE_SEC, SIZE_CLUS);
printf("\n SIZE_FAT: 0x%lx, SIZE_DATA: 0x%lx, SIZE_VOL: 0x%lx(%lu)", SIZE_FAT, SIZE_DATA, SIZE_VOL, SIZE_VOL);
#endif
}
}
}
else
{
printf("\n#Test: volume data file has been exist. \n");
goto EXIT;
}
EXIT:
fclose(fp);
return VOL_NO_ERR;
}
// 功能描述 : 从volume读入一个块
// blockaddr: block index
// buf : buffer (512 bytes - 1 sector)
uint8 VV_ReadBlock(uint32 blockaddr, uint8 *buf)
{
FILE *fp;
uint8 ret = VOL_NO_ERR;
if (blockaddr >= SEC_NUM_VOL)
return VOL_ERR_OVER_RANGE; /* 操作超出容量范围 operate over the range */
fp = fopen(VIRTUAL_VOL_NAME, "rb+");
if (fp == NULL)
{
printf("\nERR: virtual volume file is not exist.");
return VOL_ERR;
}
if(fseek(fp, blockaddr*SIZE_SEC, SEEK_SET) == 0)
{
fread(buf, 1, SIZE_SEC, fp);
}
else
ret = VOL_ERR;
return ret;
}
// 功能描述 : 向volume写入一个块
// blockaddr: block index
// buf : buffer (512 bytes - 1 sector)
uint8 VV_WriteBlock(uint32 blockaddr, uint8 *buf)
{
FILE *fp;
uint8 ret = VOL_NO_ERR;
if (blockaddr >= SEC_NUM_VOL)
return VOL_ERR_OVER_RANGE; /* 操作超出容量范围 operate over the range */
fp = fopen(VIRTUAL_VOL_NAME, "rb+");
if (fp == NULL)
{
printf("\nERR: virtual volume file is not exist.");
return VOL_ERR;
}
if(fseek(fp, blockaddr*SIZE_SEC, SEEK_SET) == 0)
{
fwrite(buf, 1, SIZE_SEC, fp);
}
else
ret = VOL_ERR;
return ret;
}
void VV_SetVVName(uint8 vv)
{
vv_name_buf = vv_name[vv];
printf("\n VV_NAME: %s \n", vv_name_buf);
}
#if 0
void VV_VolumeFormat(void)
{
}
#endif
/*********************************************************************************************************
** End Of File
********************************************************************************************************/
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -