dorkbox.peParser.headers.resources.ResourceDataEntry Maven / Gradle / Ivy

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/*
 * Copyright 2012 dorkbox, llc
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package dorkbox.peParser.headers.resources;

import dorkbox.peParser.ByteArray;
import dorkbox.peParser.headers.Header;
import dorkbox.peParser.headers.SectionTableEntry;
import dorkbox.peParser.types.DWORD;

public class ResourceDataEntry extends Header {

    public final DWORD OFFSET_TO_DATA; // The address of a unit of resource data in the Resource Data area.
    public final DWORD SIZE;
    public final DWORD CODE_PAGE;
    public final DWORD RESERVED;

    private final SectionTableEntry section;

    /**
     * @param section - necessary to know this section for when computing the location of the resource data!
     */
    public ResourceDataEntry(ByteArray bytes, SectionTableEntry section) {
        this.section = section;

        this.OFFSET_TO_DATA = new DWORD(bytes.readUInt(4), "offsetToData");
        this.SIZE = new DWORD(bytes.readUInt(4), "Size");
        this.CODE_PAGE = new DWORD(bytes.readUInt(4), "CodePage");
        this.RESERVED = new DWORD(bytes.readUInt(4), "Reserved");
    }

    public byte[] getData(ByteArray bytes) {
        // this is where to get the data from the ABSOLUTE position in the file!
        long dataOffset = this.section.POINTER_TO_RAW_DATA.get().longValue() + this.OFFSET_TO_DATA.get().longValue() - this.section.VIRTUAL_ADDRESS.get().longValue();

        if (dataOffset > Integer.MAX_VALUE) {
            throw new RuntimeException("Unable to set offset to more than 2gb!");
        }

        //String asHex = Integer.toHexString(dataOffset);
        int saved = bytes.position();
        bytes.seek((int) dataOffset);

        long bytesToCopyLong = this.SIZE.get().longValue();
        if (bytesToCopyLong > Integer.MAX_VALUE) {
            throw new RuntimeException("Unable to copy more than 2gb of bytes!");
        }

        byte[] copyBytes = bytes.copyBytes((int)bytesToCopyLong);
        bytes.seek(saved);
        return copyBytes;
    }
}