Function extractPNG

src/core/lib/FileSignatures.mjs:3034–3053

(bytes, offset)

 * @returns {Uint8Array}
 */
export function extractPNG(bytes, offset) {
    const stream = new Stream(bytes.slice(offset));

    // Move past signature to first chunk
    stream.moveForwardsBy(8);

    let chunkSize = 0,
        chunkType = "";

    while (chunkType !== "IEND") {
        chunkSize = stream.readInt(4, "be");
        chunkType = stream.readString(4);

        // Chunk data size + CRC checksum
        stream.moveForwardsBy(chunkSize + 4);
    }


    return stream.carve();
}


/**