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import { parseExtraData } from "./extra-data.js";
import { parseLinkInfo } from "./link-info.js";
import type {
LnkHeader,
LnkIdList,
LnkIdListItem,
LnkLinkInfo,
LnkParseResult,
LnkStringData
} from "./types.js";
import {
SHELL_LINK_CLSID,
SHELL_LINK_HEADER_SIZE,
describeHotKey,
linkFlag,
readCountedString,
readFiletime,
readGuid,
showCommandName
} from "./utils.js";
import { parsePidlItems } from "./pidl.js";
type LnkStringField = Exclude<keyof LnkStringData, "size" | "endOffset">;
const parseLinkHeader = (dv: DataView, warnings: string[]): LnkHeader | null => {
if (dv.byteLength < SHELL_LINK_HEADER_SIZE) {
warnings.push("Shell link header is truncated.");
return null;
}
const headerSize = dv.getUint32(0, true);
if (headerSize !== SHELL_LINK_HEADER_SIZE) {
warnings.push(`Unexpected header size ${headerSize} (expected ${SHELL_LINK_HEADER_SIZE}).`);
}
const clsid = readGuid(dv, 4);
if (clsid && clsid !== SHELL_LINK_CLSID) {
warnings.push("LinkCLSID does not match the Shell Link format.");
}
const linkFlags = dv.getUint32(0x14, true);
const fileAttributes = dv.getUint32(0x18, true);
const creationTime = readFiletime(dv, 0x1c);
const accessTime = readFiletime(dv, 0x24);
const writeTime = readFiletime(dv, 0x2c);
const fileSize = dv.getUint32(0x34, true);
const iconIndex = dv.getUint32(0x38, true);
const showCommand = dv.getUint32(0x3c, true);
const hotKey = dv.getUint16(0x40, true);
return {
size: headerSize,
clsid,
linkFlags,
fileAttributes,
creationTime,
accessTime,
writeTime,
fileSize,
iconIndex,
showCommand,
showCommandName: showCommandName(showCommand),
hotKey,
hotKeyLabel: describeHotKey(hotKey)
};
};
const parseIdList = (dv: DataView, offset: number, warnings: string[]): LnkIdList => {
if (offset + 2 > dv.byteLength) {
warnings.push("LinkTargetIDList length is truncated.");
return {
size: 0,
items: [],
truncated: true,
terminatorPresent: false,
resolvedPath: null,
totalSize: 0
};
}
const idListSize = dv.getUint16(offset, true);
const end = offset + 2 + idListSize;
if (end > dv.byteLength) {
warnings.push("LinkTargetIDList extends beyond the file size.");
}
const bodyStart = offset + 2;
const bodyEnd = Math.min(end, dv.byteLength);
const { items, terminatorPresent } = parsePidlItems(dv, bodyStart, bodyEnd, warnings);
const resolvedPath = buildPidlPath(items);
return {
size: idListSize,
items,
terminatorPresent,
truncated: end > dv.byteLength,
resolvedPath,
totalSize: Math.min(idListSize + 2, dv.byteLength - offset)
};
};
const buildPidlPath = (items: LnkIdListItem[]): string | null => {
if (!items.length) return null;
const parts: string[] = [];
const driveFromItem = (item: LnkIdListItem): string | null => {
const text = item?.longName || item?.shortName;
if (!text) return null;
const match = text.match(/^([A-Za-z]):?/);
return match && match[1] ? `${match[1].toUpperCase()}:` : null;
};
const cleanSegment = (text: string | null): string | null =>
text ? text.replace(/[\\/]+/g, "").trim() : null;
items.forEach(item => {
if (!item || item.typeName === "Root") return;
if (item.typeName === "Drive") {
const drive = driveFromItem(item);
if (drive) parts.push(drive);
return;
}
const label = cleanSegment(item.longName || item.shortName);
if (label) parts.push(label);
});
if (!parts.length) return null;
const [first] = parts;
if (first && first.endsWith(":")) {
return [first, ...parts.slice(1)].join("\\");
}
return parts.join("\\");
};
const parseStringData = (
dv: DataView,
offset: number,
linkFlags: number,
warnings: string[],
isUnicode: boolean
): LnkStringData => {
const strings: Partial<Record<LnkStringField, string>> = {};
let cursor = offset;
const readIf = (mask: number, field: LnkStringField) => {
if (!linkFlag(linkFlags, mask)) return;
const { value, size } = readCountedString(dv, cursor, isUnicode, warnings, field);
cursor += size;
if (value != null) strings[field] = value;
};
readIf(0x00000004, "name");
readIf(0x00000008, "relativePath");
readIf(0x00000010, "workingDir");
readIf(0x00000020, "arguments");
readIf(0x00000040, "iconLocation");
return { ...(strings as Partial<LnkStringData>), size: cursor - offset, endOffset: cursor };
};
export const hasShellLinkSignature = (dv: DataView): boolean =>
dv.byteLength >= SHELL_LINK_HEADER_SIZE &&
dv.getUint32(0, true) === SHELL_LINK_HEADER_SIZE &&
readGuid(dv, 4) === SHELL_LINK_CLSID;
export async function parseLnk(file: File): Promise<LnkParseResult | null> {
const buffer = await file.slice(0, file.size || 0).arrayBuffer();
const dv = new DataView(buffer);
const warnings: string[] = [];
if (!hasShellLinkSignature(dv)) return null;
const header = parseLinkHeader(dv, warnings);
if (!header) return null;
let cursor = SHELL_LINK_HEADER_SIZE;
const idList = linkFlag(header.linkFlags, 0x1)
? parseIdList(dv, cursor, warnings)
: null;
if (idList) cursor += idList.totalSize;
const linkInfo: LnkLinkInfo | null = parseLinkInfo(
dv,
cursor,
warnings,
linkFlag(header.linkFlags, 0x2) && !linkFlag(header.linkFlags, 0x100)
);
if (linkInfo?.size) cursor += linkInfo.size;
const stringData = parseStringData(
dv,
cursor,
header.linkFlags,
warnings,
linkFlag(header.linkFlags, 0x80)
);
cursor = stringData.endOffset || cursor;
const extraData = parseExtraData(dv, cursor, warnings);
const linkInfoBase = linkInfo?.localBasePathUnicode || linkInfo?.localBasePath || null;
const linkInfoSuffix = linkInfo?.commonPathSuffixUnicode || linkInfo?.commonPathSuffix || null;
const linkInfoParts: string[] = [];
if (linkInfoBase) linkInfoParts.push(linkInfoBase);
if (linkInfoSuffix) linkInfoParts.push(linkInfoSuffix);
const linkInfoPath = linkInfoParts.length
? linkInfoParts.join(linkInfoBase ? "\\" : "")
: null;
return {
header,
idList,
linkInfo,
stringData,
extraData,
warnings,
linkInfoPath
};
}
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