I never really played around with BBThumbs.dat (<= 4.7) but I have played around with thumbsXXXxXXX.dat (5.0 >). The format I figured out is as follows:
0: [short]
2: [int]
6: [int]
"bunch of tags up until Reserved1 == 0"
Tag:
0: Reserved1: [short]
2: path length [int]
6: name length [int]
10: data length [int]
14: [int]
18: [int]
22: [int]
26: "gap" (zero in value) [byte]
27: Path [ASCII the length of Path Length]
27 + path length: Name [ASCII the length of Name Length]
27 + path length + name length: Image data [byte[] the length of Data Length]
27 + path length + name length + data length: "gap" (value of 17 if another tag exists) [byte]
27 + path length + name length + data length + 1: [short]
If you can understand that.
Example reader:
private class TagGroup
{
public int Reserved1;
public int Reserved2;
public Vector Tags;
public TagGroup(InputStream st, long length) throws IOException
{
DataInputStream br = new DataInputStream(st);
if (br.readShort() != 1570) //8710 for big-endian
{
//Not valid dataBase
return;
}
Reserved1 = reverseEndian(br.readInt());
Reserved2 = reverseEndian(br.readInt());
Tags = new Vector();
long pos;
while (length > (pos = length - st.available())) //No the best way to do it but it gets the job done if all data is avalible.
{
st.mark(Integer.MAX_VALUE); //Again, not the best but if supported it gets the job done
Tag g = new Tag(br);
if (g.Reserved1 == 0)
{
st.reset();
break;
}
Tags.addElement(g);
}
//Not sure what other tags are
}
public static int reverseEndian(int value)
{
return ((value >> 24) & 0xFF) | (((value >> 16) & 0xFF) << 8) | (((value >> 8) & 0xFF) << 16) | ((value & 0xFF) << 24);
}
public static short reverseEndian(short value)
{
return (short)(((value >> 8) & 0xFF) | ((value & 0xFF) << 8));
}
public static char[] readChars(DataInputStream br, int count) throws IOException
{
char[] chars = new char[count];
for(int i = 0; i < count; i++)
{
chars[i] = br.readChar();
}
return chars;
}
}
private class Tag
{
public short Reserved1;
public int PathLength;
public int NameLength;
public int DataLength;
public int Reserved2;
public int Reserved3;
public int Reserved4;
public String Path;
public String Name;
public byte[] Image;
public short Reserved5;
public Tag(DataInputStream br) throws IOException
{
Reserved1 = TagGroup.reverseEndian(br.readShort());
PathLength = TagGroup.reverseEndian(br.readInt());
NameLength = TagGroup.reverseEndian(br.readInt());
DataLength = TagGroup.reverseEndian(br.readInt());
Reserved2 = TagGroup.reverseEndian(br.readInt());
Reserved3 = TagGroup.reverseEndian(br.readInt());
Reserved4 = TagGroup.reverseEndian(br.readInt());
int b = br.read(); //Gap (0)
Path = new String(TagGroup.readChars(br, PathLength));
Name = new String(TagGroup.readChars(br, NameLength));
if (b != 0 && Reserved1 != 0)
{
System.out.println("Invalid gap for " + Path + Name);
}
Image = new byte[DataLength];
br.read(Image);
b = br.read(); //Gap (17)
if (b != 17 && Reserved1 != 0)
{
System.out.println("Invalid 2nd gap for " + Path + Name);
}
Reserved5 = br.readShort();
}
}
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