0x00--0x32: Header and comment
0x33--0x34: Length of data section
0x35--0x43: Variable header
0x44--0x45: Variable length
0x46--0x47: Variable length
0x48: Program data
Don't forget to add the checksum at the end.
The length field is needed three times. The first, it specifies the length of the data section. The second time, it specifies the length of the variable. The third time, it is part of the program variable. You specify the same length each time, though.
The following is some code I quickly threw together for a project.
Code:
[code]
/// <summary>
/// Exports the font into the 8xv format.
/// </summary>
/// <param name="path">The file to write the font to.</param>
public void Export(string path)
{
byte[] header = new byte[]
{
// TI File format header
(byte)'*', (byte)'*', (byte)'T', (byte)'I', // 03
(byte)'8', (byte)'3', (byte)'F', (byte)'*', // 07
// More header and comment
26, 10, 0, (byte)'F', (byte)'i', (byte)'l', // 0B
(byte)'e', (byte)' ', (byte)'g', (byte)'e', // 0F
(byte)'n', (byte)'e', (byte)'r', (byte)'a', // 13
(byte)'t', (byte)'e', (byte)'d', (byte)' ', // 17
(byte)'b', (byte)'y', (byte)' ', (byte)'P', // 1B
(byte)'A', (byte)'T', (byte)' ', (byte)'F', // 1F
(byte)'o', (byte)'n', (byte)'t', (byte)' ', // 23
(byte)'E', (byte)'d', (byte)'i', (byte)'t', // 27
(byte)'o', (byte)'r', (byte)'.', (byte)' ', // 2B
(byte)' ', (byte)' ', (byte)' ', (byte)' ', // 2F
(byte)' ', (byte)' ', (byte)' ', // 32
// Space for length field
0, 0, // 34
// Variable header
13, 0, // type // 36
0, 0, // length word // 38
21, // type // 39
0, 0, 0, 0, 0, 0, 0, 0, // prgm name // 41
0, 128, // flags // 43
0, 0, // length
0, 0, // length for the third time
// Font file header
0xBB, 0x6D, 0xC9, // compiled prgm token and ret instruction
(byte)'f', (byte)'o', (byte)'n', (byte)'t', // magic word
0, 0, // version
}; //16192
byte[] data = new byte[32768]; // If you make a font this large, you've got problems.
for (int i = 0; i < header.Length; i++)
data[i] = header[i];
// Write program name
int bytes = 0x3C;
for (int i = 0; i < calcName.Length; i++)
data[bytes++] = (byte)calcName[i];
// THIS SECTION GENERATES THE PROGRAM DATA
// Write metadata
bytes = 0x55;
for (int i = 0; i < FontName.Length; i++)
data[bytes++] = (byte)FontName[i];
bytes++;
for (int i = 0; i < FontDescription.Length; i++)
data[bytes++] = (byte)FontDescription[i];
bytes++;
for (int i = 0; i < 8; i++)
data[bytes++] = (byte)fontEncoding[i];
// Update metadata length word
int length = bytes - 0x55;
data[0x53] = (byte)(length & 0xFF);
data[0x54] = (byte)(length >> 8);
// Height
data[bytes++] = (byte)height;
// Write widths
for (int chr = 0; chr < 256; chr++)
data[bytes++] = (byte)this[chr].Width;
// Write bitmaps
for (int row = 0; row < height; row++)
for (int chr = 0; chr < 256; chr++)
data[bytes++] = this[chr].rawReadLine(row);
// END PROGRAM DATA
// Update length fields
length = (bytes - 0x4A);
byte lenHigh = (byte)(length >> 8);
byte lenLow = (byte)(length & 0xFF);
data[0x39] = lenLow;
data[0x3A] = lenHigh;
data[0x46] = lenLow;
data[0x47] = lenHigh;
data[0x48] = lenLow;
data[0x49] = lenHigh;
length = (bytes - 0x37);
lenHigh = (byte)(length >> 8);
lenLow = (byte)(length & 0xFF);
data[0x35] = lenLow;
data[0x36] = lenHigh;
// Calculate checksum
int checksum = 0;
for (int i = 0x37; i < bytes; i++)
checksum = (checksum + data[i]) % 65536;
data[bytes++] = (byte)(checksum & 0xFF);
data[bytes++] = (byte)(checksum >> 8);
// Copy data and write
byte[] finalData = new byte[bytes];
for (int i = 0; i < bytes; i++)
finalData[i] = data[i];
// Write out file
System.IO.File.WriteAllBytes(path, finalData);
}
[/code]
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