apr144-bam/esm/virtualOffset.js

Parser for BAM and BAM index (bai) files

export default class VirtualOffset {
    constructor(blockPosition, dataPosition) {
        this.blockPosition = blockPosition; // < offset of the compressed data block
        this.dataPosition = dataPosition; // < offset into the uncompressed data
    }
    toString() {
        return `${this.blockPosition}:${this.dataPosition}`;
    }
    compareTo(b) {
        return (this.blockPosition - b.blockPosition || this.dataPosition - b.dataPosition);
    }
    static min(...args) {
        let min;
        let i = 0;
        for (; !min; i += 1) {
            min = args[i];
        }
        for (; i < args.length; i += 1) {
            if (min.compareTo(args[i]) > 0) {
                min = args[i];
            }
        }
        return min;
    }
}
export function fromBytes(bytes, offset = 0, bigendian = false) {
    if (bigendian) {
        throw new Error('big-endian virtual file offsets not implemented');
    }
    return new VirtualOffset(bytes[offset + 7] * 0x10000000000 +
        bytes[offset + 6] * 0x100000000 +
        bytes[offset + 5] * 0x1000000 +
        bytes[offset + 4] * 0x10000 +
        bytes[offset + 3] * 0x100 +
        bytes[offset + 2], (bytes[offset + 1] << 8) | bytes[offset]);
}
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