Java DataSink.consume方法代碼示例

import com.android.apksig.util.DataSink; //導入方法依賴的package包/類
/**
 * Outputs this record, replacing its extra field with the provided one, and returns returns the
 * number of bytes output.
 */
public long outputRecordWithModifiedExtra(
        DataSource sourceApk,
        ByteBuffer extra,
        DataSink output) throws IOException {
    long recordStartOffsetInSource = getStartOffsetInArchive();
    int extraStartOffsetInRecord = getExtraFieldStartOffsetInsideRecord();
    int extraSizeBytes = extra.remaining();
    int headerSize = extraStartOffsetInRecord + extraSizeBytes;
    ByteBuffer header = ByteBuffer.allocate(headerSize);
    header.order(ByteOrder.LITTLE_ENDIAN);
    sourceApk.copyTo(recordStartOffsetInSource, extraStartOffsetInRecord, header);
    header.put(extra.slice());
    header.flip();
    ZipUtils.setUnsignedInt16(header, EXTRA_LENGTH_OFFSET, extraSizeBytes);

    long outputByteCount = header.remaining();
    output.consume(header);
    long remainingRecordSize = getSize() - mDataStartOffset;
    sourceApk.feed(recordStartOffsetInSource + mDataStartOffset, remainingRecordSize, output);
    outputByteCount += remainingRecordSize;
    return outputByteCount;
}
 

import com.android.apksig.util.DataSink; //導入方法依賴的package包/類
@Override
public void feed(long offset, long size, DataSink sink) throws IOException {
    long sourceSize = size();
    checkChunkValid(offset, size, sourceSize);
    if (size == 0) {
        return;
    }

    long chunkOffsetInFile = mOffset + offset;
    long remaining = size;
    byte[] buf = new byte[(int) Math.min(remaining, MAX_READ_CHUNK_SIZE)];
    while (remaining > 0) {
        int chunkSize = (int) Math.min(remaining, buf.length);
        synchronized (mFile) {
            mFile.seek(chunkOffsetInFile);
            mFile.readFully(buf, 0, chunkSize);
        }
        sink.consume(buf, 0, chunkSize);
        chunkOffsetInFile += chunkSize;
        remaining -= chunkSize;
    }
}
 

import com.android.apksig.util.DataSink; //導入方法依賴的package包/類
/**
 * Outputs the specified Local File Header record with its data and returns the number of bytes
 * output.
 */
public static long outputRecordWithDeflateCompressedData(
        String name,
        int lastModifiedTime,
        int lastModifiedDate,
        byte[] compressedData,
        long crc32,
        long uncompressedSize,
        DataSink output) throws IOException {
    byte[] nameBytes = name.getBytes(StandardCharsets.UTF_8);
    int recordSize = HEADER_SIZE_BYTES + nameBytes.length;
    ByteBuffer result = ByteBuffer.allocate(recordSize);
    result.order(ByteOrder.LITTLE_ENDIAN);
    result.putInt(RECORD_SIGNATURE);
    ZipUtils.putUnsignedInt16(result,  0x14); // Minimum version needed to extract
    result.putShort(ZipUtils.GP_FLAG_EFS); // General purpose flag: UTF-8 encoded name
    result.putShort(ZipUtils.COMPRESSION_METHOD_DEFLATED);
    ZipUtils.putUnsignedInt16(result, lastModifiedTime);
    ZipUtils.putUnsignedInt16(result, lastModifiedDate);
    ZipUtils.putUnsignedInt32(result, crc32);
    ZipUtils.putUnsignedInt32(result, compressedData.length);
    ZipUtils.putUnsignedInt32(result, uncompressedSize);
    ZipUtils.putUnsignedInt16(result, nameBytes.length);
    ZipUtils.putUnsignedInt16(result, 0); // Extra field length
    result.put(nameBytes);
    if (result.hasRemaining()) {
        throw new RuntimeException("pos: " + result.position() + ", limit: " + result.limit());
    }
    result.flip();

    long outputByteCount = result.remaining();
    output.consume(result);
    outputByteCount += compressedData.length;
    output.consume(compressedData, 0, compressedData.length);
    return outputByteCount;
}
 

import com.android.apksig.util.DataSink; //導入方法依賴的package包/類
@Override
public void feed(long offset, long size, DataSink sink) throws IOException {
    if ((size < 0) || (size > mSize)) {
        throw new IndexOutOfBoundsException("size: " + size + ", source size: " + mSize);
    }
    sink.consume(getByteBuffer(offset, (int) size));
}
 

import com.android.apksig.util.DataSink; //導入方法依賴的package包/類
@Override
public void feed(long offset, long size, DataSink sink) throws IOException {
    checkChunkValid(offset, size);

    // checkChunkValid ensures that it's OK to cast offset and size to int.
    sink.consume(mArray, (int) offset, (int) size);
}
 

import com.android.apksig.util.DataSink; //導入方法依賴的package包/類
@Override
public void feed(long offset, long size, DataSink sink) throws IOException {
    if ((size < 0) || (size > mSize)) {
        throw new IllegalArgumentException("size: " + size + ", source size: " + mSize);
    }
    sink.consume(getByteBuffer(offset, (int) size));
}