private void button10_Click(object sender, EventArgs e)
{
/*
* struct bpb_t {//biosParmBlock
* char bytesPerSector_0;
* char bytesPerSector_1;
* char sectorsPerCluster;
* char reservedSectorCount_0;
* char reservedSectorCount_1;
* char fatCount;
* char rootDirEntryCount_0;
* char rootDirEntryCount_1;
* char totalSectors16_0;
* char totalSectors16_1;
*
* char mediaType;
*
* char sectorsPerFat16_0;
* char sectorsPerFat16_1;
* char sectorsPerTrtack_0;
* char sectorsPerTrtack_1;
* char headCount_0;
* char headCount_1;
* char hidddenSectors_0;
* char hidddenSectors_1;
* char hidddenSectors_2;
* char hidddenSectors_3;
*
* char totalSectors32_0;
* char totalSectors32_1;
* char totalSectors32_2;
* char totalSectors32_3;
* char sectorsPerFat32_0;
* char sectorsPerFat32_1;
* char sectorsPerFat32_2;
* char sectorsPerFat32_3;
* char fat32Flags_0;
* char fat32Flags_1;
*
* char fat32Version_0;
* char fat32Version_1;
* char fat32RootCluster_0;
* char fat32RootCluster_1;
* char fat32RootCluster_2;
* char fat32RootCluster_3;
* char fat32FSInfo_0;
* char fat32FSInfo_1;
* char fat32BackBootBlock_0;
* char fat32BackBootBlock_1;
*
* char fat32Reserved[12];
* };41+12
*
* struct fbs_t {//fat32BootSector
* char jmpToBootCode[3]; 3
* char oemName[8]; 8
* bpb_t bpb; 41+12
*
* char driveNumber;
* char reserved1;
* char bootSignature;
* char volumeSerialNumber_0;
* char volumeSerialNumber_1;
* char volumeSerialNumber_2;
* char volumeSerialNumber_3; 7
*
* char volumeLabel[11]; 11
* char fileSystemType[8]; 8
* char bootCode[420];
* char bootSectorSig0;
* char bootSectorSig1;
* };
* struct dir_t {//directoryEntry
* char name[11];
* char attributes;
* char reservedNT;
* char creationTimeTenths;
* char creationTime_0;
* char creationTime_1;
*
* char creationDate_0;
* char creationDate_1;
* char lastAccessDate_0;
* char lastAccessDate_1;
* char firstClusterHigh_0; 20
* char firstClusterHigh_1;
* char lastWriteTime_0;
* char lastWriteTime_1;
* char lastWriteDate_0;
* char lastWriteDate_1;
* char firstClusterLow_0; 26
* char firstClusterLow_1;
* char fileSize_0;
* char fileSize_1;
* char fileSize_2;
* char fileSize_3;
* };
*
*/
SDUtils sd = new SDUtils(this.textBox3.Text + ":");
byte[] fbs = sd.ReadSector(0);
int volumeStartBlock = 0;
int reservedSectorCount = fbs[3 + 8 + 3 + 0] | (fbs[3 + 8 + 3 + 1] << 8);
int fatStartBlock = volumeStartBlock + reservedSectorCount;
int fatCount = fbs[3 + 8 + 5];
int blocksPerFat = fbs[3 + 8 + 11 + 0] | (fbs[3 + 8 + 11 + 1] << 8);
int rootDirStart = fatStartBlock + fatCount * blocksPerFat;
int rootDirEntryCount = fbs[3 + 8 + 6 + 0] | (fbs[3 + 8 + 6 + 1] << 8);
int dataStartBlock = rootDirStart + (((rootDirEntryCount << 5) + 511) >> 9);
byte[] root = sd.ReadSector(rootDirStart);
string name = "BOOT BIN";
//string name = "TEST1 TXT";
int index = -1;
for (int i = 0; i < 512; i += 32)
{
int match = 1;
for (int j = 0; j < 11; j++)
{
if (root[i + j] != (byte)name[j])
{
match = 0;
break;
}
}
if (match == 1)
{
index = i;
}
}
int firstCluster;
int fileSize;
if (index >= 0)
{
firstCluster = root[index + 26 + 0] | (root[index + 26 + 1] << 8) | (root[index + 20 + 0] << 16) | (root[index + 20 + 1] << 24);
fileSize = root[index + 28 + 0] | (root[index + 28 + 1] << 8) | (root[index + 28 + 2] << 16) | (root[index + 28 + 3] << 24);
}
else
{
throw new Exception("not found boot.bin");
}
short[] fat = new short[blocksPerFat * 256];
for (int i = 0; i < blocksPerFat; i++)
{
byte[] fattemp = sd.ReadSector(fatStartBlock + i);
for (int j = 0; j < 256; j++)
{
fat[i * 256 + j] = (short)(fattemp[j * 2] + (fattemp[j * 2 + 1] << 8));
}
}
int blocks = 0;
int start = firstCluster;
while (true)
{
int oldStart = start;
start = fat[start];
blocks++;
if (start == -1)
{
break;
}
if (start != oldStart + 1)
{
throw new Exception("not continue block");
}
}
int sectorsPerCluster = fbs[3 + 8 + 2];
int blockOfCluster = 0;
int firstBlock = dataStartBlock + (firstCluster - 2) * sectorsPerCluster + blockOfCluster;
byte[] data = sd.ReadSector(firstBlock);
int bootrec = 3 + 8 + 41 + 12 + 7 + 11 + 8;
fbs[bootrec + 0] = 0x12;
fbs[bootrec + 1] = 0x34;
fbs[bootrec + 2] = 0x56;
fbs[bootrec + 3] = 0x78;
fbs[bootrec + 4] = (byte)((firstBlock >> 0) & 0xFF);
fbs[bootrec + 5] = (byte)((firstBlock >> 8) & 0xFF);
fbs[bootrec + 6] = (byte)((firstBlock >> 16) & 0xFF);
fbs[bootrec + 7] = (byte)((firstBlock >> 24) & 0xFF);
fbs[bootrec + 8] = (byte)((blocks >> 0) & 0xFF);
fbs[bootrec + 9] = (byte)((blocks >> 8) & 0xFF);
fbs[bootrec + 10] = (byte)((blocks >> 16) & 0xFF);
fbs[bootrec + 11] = (byte)((blocks >> 24) & 0xFF);
sd.WriteSector(fbs, 0);
MessageBox.Show("ok");
sd.Close();
}
