@gmod/bam/esm/chunk.js

Parser for BAM and BAM index (bai) files

// little class representing a chunk in the index
export default class Chunk {
    minv;
    maxv;
    bin;
    // Absolute byte offset where the fetch for this chunk ends. The compressed
    // size of the final BGZF block (the one at maxv.blockPosition) is unknown
    // from the index, so this defaults to a full max-size block past maxv. It can
    // be tightened to the next known block boundary via clampChunkEnds.
    endPosition;
    constructor(minv, maxv, bin, endPosition = maxv.blockPosition + (1 << 16)) {
        this.minv = minv;
        this.maxv = maxv;
        this.bin = bin;
        this.endPosition = endPosition;
    }
    toString() {
        return `${this.minv.toString()}..${this.maxv.toString()} (bin ${this.bin}, fetchedSize ${this.fetchedSize()})`;
    }
    compareTo(b) {
        return (this.minv.compareTo(b.minv) ||
            this.maxv.compareTo(b.maxv) ||
            this.bin - b.bin);
    }
    fetchedSize() {
        return this.endPosition - this.minv.blockPosition;
    }
}
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