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refactor(archive): prepare for noUncheckedIndexedAccess #4110

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merged 2 commits into from
Jan 8, 2024
Merged

refactor(archive): prepare for noUncheckedIndexedAccess #4110

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b643576
refactor(archive): prepare for noUncheckedIndexedAccess
syhol Jan 5, 2024
2061dd5
adjust test to handle new TarHeader requirements
syhol Jan 5, 2024
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6 changes: 4 additions & 2 deletions archive/_common.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -71,7 +71,7 @@ struct posix_header { // byte offset
};
*/

export const ustarStructure: Array<{ field: string; length: number }> = [
export const ustarStructure = [
{
field: "fileName",
length: 100,
Expand Down Expand Up @@ -136,7 +136,9 @@ export const ustarStructure: Array<{ field: string; length: number }> = [
field: "padding",
length: 12,
},
];
] as const;

export type UstarFields = (typeof ustarStructure)[number]["field"];

export async function readBlock(
reader: Reader,
Expand Down
13 changes: 7 additions & 6 deletions archive/untar.ts
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Expand Up @@ -34,6 +34,7 @@ import {
HEADER_LENGTH,
readBlock,
type TarMeta,
UstarFields,
ustarStructure,
} from "./_common.ts";
import { readAll } from "../streams/read_all.ts";
Expand All @@ -47,9 +48,9 @@ export interface TarMetaWithLinkName extends TarMeta {
linkName?: string;
}

export interface TarHeader {
[key: string]: Uint8Array;
}
export type TarHeader = {
[key in UstarFields]: Uint8Array;
};
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@syhol syhol Jan 5, 2024 •
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If you don't want this public type to have this slight change, we could look at creating a new non-exported type and casting the header to this new type inside getMetadata: https://github.com/denoland/deno_std/blob/b64357605cf55edc2fdd278e057d7f0b9f665195/archive/untar.ts#L256-L293

However I understand this submodule is likely to change a fair bit soon with the Streams API updates, so perhaps we don't need to be so cautious in this case?


// https://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html#tag_20_92_13_06
// eight checksum bytes taken to be ascii spaces (decimal value 32)
Expand All @@ -69,8 +70,8 @@ function trim(buffer: Uint8Array): Uint8Array {
* Parse file header in a tar archive
* @param length
*/
function parseHeader(buffer: Uint8Array): { [key: string]: Uint8Array } {
const data: { [key: string]: Uint8Array } = {};
function parseHeader(buffer: Uint8Array): TarHeader {
const data = {} as TarHeader;
let offset = 0;
ustarStructure.forEach(function (value) {
const arr = buffer.subarray(offset, offset + value.length);
Expand Down Expand Up @@ -222,7 +223,7 @@ export class Untar {
// Ignore checksum header
continue;
}
sum += header[i];
sum += header[i]!;
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}
return sum;
}
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