1234567891011121314151617181920212223242526272829303132333435363738394041424344454647
import { ZIP_LOCAL_FILE_HEADER } from "./const.ts";import { File } from "../types.ts";
export interface LocalFileHeader {  signature: number;  version: number;  flag: number;  compressionMethod: number;  lastModifiedTime: number;  lastModifiedDate: number;  crc32: number;  compressedSize: number;  uncompressedSize: number;  fileNameLength: number;  extraFieldLength: number;}export async function getLFHeaderView(file: File, offset: number) {  const temp = new Uint8Array(ZIP_LOCAL_FILE_HEADER.MIN_LENGTH);  const tempView = new DataView(temp.buffer);  await file.seek(offset, Deno.SeekMode.Start);  await file.read(temp);  const size = getLFHeaderSize(tempView);  const lfheader = new Uint8Array(size);  await file.seek(offset, Deno.SeekMode.Start);  await file.read(lfheader);  return new DataView(lfheader.buffer);}export function getLFHeaderSize(view: DataView) {  return ZIP_LOCAL_FILE_HEADER.MIN_LENGTH + view.getUint16(26, true) +    view.getUint16(28, true);}export function getLFHeaderObject(view: DataView): LocalFileHeader {  return {    signature: view.getUint32(0, true),    version: view.getUint16(4, true),    flag: view.getUint16(6, true),    compressionMethod: view.getUint16(8, true),    lastModifiedTime: view.getUint16(10, true),    lastModifiedDate: view.getUint16(12, true),    crc32: view.getUint32(14, true),    compressedSize: view.getUint32(18, true),    uncompressedSize: view.getUint32(22, true),    fileNameLength: view.getUint16(26, true),    extraFieldLength: view.getUint16(28, true),  };}