org.mabb.fontverter.woff.WoffParser Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of FontVerter Show documentation
Library for converting various font formats.
The newest version!
/*
 * Copyright (C) Maddie Abboud 2016
 *
 * FontVerter is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * FontVerter is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with FontVerter. If not, see .
 */

package org.mabb.fontverter.woff;

import org.mabb.fontverter.io.DataTypeBindingDeserializer;
import org.mabb.fontverter.io.FontDataInput;
import org.mabb.fontverter.io.FontDataInputStream;
import org.mabb.fontverter.woff.Woff1Font.Woff1Table;

import java.io.IOException;

public class WoffParser {
    protected WoffFont font;
    protected FontDataInput input;

    public WoffFont parse(byte[] data) throws IOException {
        return parse(data, null);
    }

    public WoffFont parse(byte[] data, WoffFont readTo) throws IOException {
        this.font = readTo;
        initalizeFont();

        this.input = new FontDataInputStream(data);
        font.header = parseHeader();
        parseTables();

        return font;
    }

    protected void initalizeFont() {
        if (font == null)
            font = WoffFont.createBlankFont(1);
    }

    private WoffHeader parseHeader() throws IOException {
        DataTypeBindingDeserializer deserializer = new DataTypeBindingDeserializer();

        WoffHeader header = (WoffHeader) deserializer.deserialize(this.input, WoffHeader.class);
        if (!header.isSignatureValid())
            throw new IOException("Woff header signature not recognized");
        return header;
    }

    protected void parseTables() throws IOException {
        for (int i = 0; i < font.header.numTables; i++)
            parseDirectoryEntry();

        for (WoffTable tableOn : font.getTables())
            parseTableData((Woff1Table) tableOn);
    }

    private void parseTableData(Woff1Table tableOn) throws IOException {
        input.seek(tableOn.offset);
        byte[] compressedData = input.readBytes(tableOn.transformLength);

        tableOn.readCompressedData(compressedData);
    }

    private void parseDirectoryEntry() throws IOException {
        Woff1Table table = (Woff1Table) font.createTable();

        table.tag = input.readString(4);
        table.offset = input.readInt();
        table.transformLength = input.readInt();
        table.originalLength = input.readInt();
        table.checksum = input.readUnsignedInt();

        font.getTables().add(table);
    }
}