Java RandomAccessData.getSize方法代码示例

import org.springframework.boot.loader.data.RandomAccessData; //导入方法依赖的package包/类
/**
 * Create a new {@link CentralDirectoryEndRecord} instance from the specified
 * {@link RandomAccessData}, searching backwards from the end until a valid block is
 * located.
 * @param data the source data
 * @throws IOException in case of I/O errors
 */
CentralDirectoryEndRecord(RandomAccessData data) throws IOException {
	this.block = createBlockFromEndOfData(data, READ_BLOCK_SIZE);
	this.size = MINIMUM_SIZE;
	this.offset = this.block.length - this.size;
	while (!isValid()) {
		this.size++;
		if (this.size > this.block.length) {
			if (this.size >= MAXIMUM_SIZE || this.size > data.getSize()) {
				throw new IOException("Unable to find ZIP central directory "
						+ "records after reading " + this.size + " bytes");
			}
			this.block = createBlockFromEndOfData(data, this.size + READ_BLOCK_SIZE);
		}
		this.offset = this.block.length - this.size;
	}
}
 

import org.springframework.boot.loader.data.RandomAccessData; //导入方法依赖的package包/类
/**
 * Returns the location in the data that the archive actually starts. For most files
 * the archive data will start at 0, however, it is possible to have prefixed bytes
 * (often used for startup scripts) at the beginning of the data.
 * @param data the source data
 * @return the offset within the data where the archive begins
 */
public long getStartOfArchive(RandomAccessData data) {
	long length = Bytes.littleEndianValue(this.block, this.offset + 12, 4);
	long specifiedOffset = Bytes.littleEndianValue(this.block, this.offset + 16, 4);
	long actualOffset = data.getSize() - this.size - length;
	return actualOffset - specifiedOffset;
}