8000 Add file name prefix handling + fix incorrect user + group handling by ofersadgat · Pull Request #39 · unjs/nanotar · GitHub
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Add file name prefix handling + fix incorrect user + group handling #39

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Add file name prefix handling + fix incorrect user + group handling #39

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36 changes: 26 additions & 10 deletions src/parse.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -104,17 +104,33 @@ export function parseTar<
// No default
}

let user, group;
// Ustar indicator (offset: 257 - length: 6)
// Ignore

// Ustar version (offset: 263 - length: 2)
// Ignore

// File owner user (offset: 265 - length: 32)
const user = _readString(buffer, offset + 265, 32);

// File owner group (offset: 297 - length: 32)
const group = _readString(buffer, offset + 297, 32);
const ustar = _readString(buffer, offset + 257, 6);
if (ustar == 'ustar'){
// Ustar version (offset: 263 - length: 2)
// Ignore

// File owner user (offset: 265 - length: 32)
user = _readString(buffer, offset + 265, 32);

// File owner group (offset: 297 - length: 32)
group = _readString(buffer, offset + 297, 32);

// Filename prefix (offset: 345 - length: 155)
const prefix = _readString(buffer, offset + 345, 155);
if (prefix){
const prefixEndsWithSlash = prefix.endsWith('/');
const nameStartsWithSlash = name.startsWith('/');
if (prefixEndsWithSlash && nameStartsWithSlash){
name = prefix + name.substring(1);
} else if (prefixEndsWithSlash || nameStartsWithSlash){
name = prefix + name;
} else {
name = prefix + '/' + name;
}
}
}

// Group all file metadata
const meta: ParsedTarFileItemMeta = {
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