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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
import { PartialReadError } from "../io/buf_reader.ts";import type { Reader } from "../io/types.ts";
/** Base interface for {@linkcode TarMeta} */export interface TarInfo {  /**   * The underlying raw `st_mode` bits that contain the standard Unix   * permissions for this file/directory.   */  fileMode?: number;  /**   * Data modification time of the file at the time it was archived. It   * represents the integer number of seconds since January 1, 1970, 00:00 UTC.   */  mtime?: number;  /**   * Numeric user ID of the file owner. This is ignored if the operating system   * does not support numeric user IDs.   */  uid?: number;  /**   * Numeric group ID of the file owner. This is ignored if the operating   * system does not support numeric group IDs.   */  gid?: number;  /** The name of the file owner. */  owner?: string;  /** The group that the file owner belongs to. */  group?: string;  /**   * The type of file archived.   *   * @see {@linkcode FileTypes}   */  type?: string;}
/** Base interface for {@linkcode TarMetaWithLinkName}. */export interface TarMeta extends TarInfo {  /**   * The name of the file, with directory names (if any) preceding the file   * name, separated by slashes.   */  fileName: string;  /**   * The size of the file in bytes; for archive members that are symbolic or   * hard links to another file, this field is specified as zero.   */  fileSize?: number;}
/** The type of file archived. */export enum FileTypes {  "file" = 0,  "link" = 1,  "symlink" = 2,  "character-device" = 3,  "block-device" = 4,  "directory" = 5,  "fifo" = 6,  "contiguous-file" = 7,}
export const HEADER_LENGTH = 512;
/*struct posix_header {           // byte offset  char name[100];               //   0  char mode[8];                 // 100  char uid[8];                  // 108  char gid[8];                  // 116  char size[12];                // 124  char mtime[12];               // 136  char chksum[8];               // 148  char typeflag;                // 156  char linkname[100];           // 157  char magic[6];                // 257  char version[2];              // 263  char uname[32];               // 265  char gname[32];               // 297  char devmajor[8];             // 329  char devminor[8];             // 337  char prefix[155];             // 345                                // 500};*/
export const USTAR_STRUCTURE = [  {    field: "fileName",    length: 100,  },  {    field: "fileMode",    length: 8,  },  {    field: "uid",    length: 8,  },  {    field: "gid",    length: 8,  },  {    field: "fileSize",    length: 12,  },  {    field: "mtime",    length: 12,  },  {    field: "checksum",    length: 8,  },  {    field: "type",    length: 1,  },  {    field: "linkName",    length: 100,  },  {    field: "ustar",    length: 8,  },  {    field: "owner",    length: 32,  },  {    field: "group",    length: 32,  },  {    field: "majorNumber",    length: 8,  },  {    field: "minorNumber",    length: 8,  },  {    field: "fileNamePrefix",    length: 155,  },  {    field: "padding",    length: 12,  },] as const;
/** * @internal */export type UstarFields = (typeof USTAR_STRUCTURE)[number]["field"];
export async function readBlock(  reader: Reader,  p: Uint8Array,): Promise<number | null> {  let bytesRead = 0;  while (bytesRead < p.length) {    const rr = await reader.read(p.subarray(bytesRead));    if (rr === null) {      if (bytesRead === 0) {        return null;      } else {        throw new PartialReadError();      }    }    bytesRead += rr;  }  return bytesRead;}