+++ /dev/null
-/* -*- Mode: java; indent-tabs-mode: nil; c-basic-offset: 2 -*-
-
- * Copyright (C) 2011 George Yunaev @ Ulduzsoft
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
-
- http://www.ulduzsoft.com/2012/01/enumerating-the-fonts-on-android-platform/
- */
-
-package org.jwz.xscreensaver;
-
-import java.io.File;
-import java.io.FileNotFoundException;
-import java.io.IOException;
-import java.io.RandomAccessFile;
-import java.util.HashMap;
-
-// The class which loads the TTF file, parses it and returns the TTF font name
-class TTFAnalyzer
-{
- // This function parses the TTF file and returns the font name specified in the file
- public String getTtfFontName( String fontFilename )
- {
- try
- {
- // Parses the TTF file format.
- // See http://developer.apple.com/fonts/ttrefman/rm06/Chap6.html
- m_file = new RandomAccessFile( fontFilename, "r" );
-
- // Read the version first
- int version = readDword();
-
- // The version must be either 'true' (0x74727565) or 0x00010000 or 'OTTO' (0x4f54544f) for CFF style fonts.
- if ( version != 0x74727565 && version != 0x00010000 && version != 0x4f54544f)
- return null;
-
- // The TTF file consist of several sections called "tables", and we need to know how many of them are there.
- int numTables = readWord();
-
- // Skip the rest in the header
- readWord(); // skip searchRange
- readWord(); // skip entrySelector
- readWord(); // skip rangeShift
-
- // Now we can read the tables
- for ( int i = 0; i < numTables; i++ )
- {
- // Read the table entry
- int tag = readDword();
- readDword(); // skip checksum
- int offset = readDword();
- int length = readDword();
-
- // Now here' the trick. 'name' field actually contains the textual string name.
- // So the 'name' string in characters equals to 0x6E616D65
- if ( tag == 0x6E616D65 )
- {
- // Here's the name section. Read it completely into the allocated buffer
- byte[] table = new byte[ length ];
-
- m_file.seek( offset );
- read( table );
-
- // This is also a table. See http://developer.apple.com/fonts/ttrefman/rm06/Chap6name.html
- // According to Table 36, the total number of table records is stored in the second word, at the offset 2.
- // Getting the count and string offset - remembering it's big endian.
- int count = getWord( table, 2 );
- int string_offset = getWord( table, 4 );
-
- // Record starts from offset 6
- for ( int record = 0; record < count; record++ )
- {
- // Table 37 tells us that each record is 6 words -> 12 bytes, and that the nameID is 4th word so its offset is 6.
- // We also need to account for the first 6 bytes of the header above (Table 36), so...
- int nameid_offset = record * 12 + 6;
- int platformID = getWord( table, nameid_offset );
- int nameid_value = getWord( table, nameid_offset + 6 );
-
- // Table 42 lists the valid name Identifiers. We're interested in 4 but not in Unicode encoding (for simplicity).
- // The encoding is stored as PlatformID and we're interested in Mac encoding
- if ( nameid_value == 4 && platformID == 1 )
- {
- // We need the string offset and length, which are the word 6 and 5 respectively
- int name_length = getWord( table, nameid_offset + 8 );
- int name_offset = getWord( table, nameid_offset + 10 );
-
- // The real name string offset is calculated by adding the string_offset
- name_offset = name_offset + string_offset;
-
- // Make sure it is inside the array
- if ( name_offset >= 0 && name_offset + name_length < table.length )
- return new String( table, name_offset, name_length );
- }
- }
- }
- }
-
- return null;
- }
- catch (FileNotFoundException e)
- {
- // Permissions?
- return null;
- }
- catch (IOException e)
- {
- // Most likely a corrupted font file
- return null;
- }
- }
-
- // Font file; must be seekable
- private RandomAccessFile m_file = null;
-
- // Helper I/O functions
- private int readByte() throws IOException
- {
- return m_file.read() & 0xFF;
- }
-
- private int readWord() throws IOException
- {
- int b1 = readByte();
- int b2 = readByte();
-
- return b1 << 8 | b2;
- }
-
- private int readDword() throws IOException
- {
- int b1 = readByte();
- int b2 = readByte();
- int b3 = readByte();
- int b4 = readByte();
-
- return b1 << 24 | b2 << 16 | b3 << 8 | b4;
- }
-
- private void read( byte [] array ) throws IOException
- {
- if ( m_file.read( array ) != array.length )
- throw new IOException();
- }
-
- // Helper
- private int getWord( byte [] array, int offset )
- {
- int b1 = array[ offset ] & 0xFF;
- int b2 = array[ offset + 1 ] & 0xFF;
-
- return b1 << 8 | b2;
- }
-}
projects / xscreensaver / blobdiff