@electron/asar - npm Package Compare versions

Comparing version 4.1.1 to 4.1.2

lib/asar.js

@@ -16,9 +16,12 @@ import path from 'node:path';
     if (dirPath.startsWith(pattern) || minimatch(dirPath, pattern)) {
-        if (!unpackDirs.includes(dirPath)) {
-            unpackDirs.push(dirPath);
-        }
+        unpackDirs.add(dirPath);
         return true;
     }
     else {
-        return unpackDirs.some((unpackDir) => dirPath.startsWith(unpackDir) && !path.relative(unpackDir, dirPath).startsWith('..'));
+        for (const unpackDir of unpackDirs) {
+            if (dirPath.startsWith(unpackDir) && !path.relative(unpackDir, dirPath).startsWith('..')) {
+                return true;
+            }
+        }
+        return false;
     }
@@ -54,3 +57,3 @@ }
     const links = [];
-    const unpackDirs = [];
+    const unpackDirs = new Set();
     let filenamesSorted = [];
@@ -82,10 +85,14 @@ if (options.ordering) {
         const total = filenames.length;
+        const filenameSet = new Set(filenames);
+        const sortedSet = new Set();
         for (const file of ordering) {
-            if (!filenamesSorted.includes(file) && filenames.includes(file)) {
+            if (!sortedSet.has(file) && filenameSet.has(file)) {
                 filenamesSorted.push(file);
+                sortedSet.add(file);
             }
         }
         for (const file of filenames) {
-            if (!filenamesSorted.includes(file)) {
+            if (!sortedSet.has(file)) {
                 filenamesSorted.push(file);
+                sortedSet.add(file);
                 missing += 1;
@@ -99,4 +106,16 @@ }
     }
-    const handleFile = async function (filename) {
-        if (!metadata[filename]) {
+    const shouldUnpackPath = function (filename, relativePath, unpack, unpackDir) {
+        let shouldUnpack = false;
+        if (unpack) {
+            shouldUnpack = minimatch(filename, unpack, { matchBase: true });
+        }
+        if (!shouldUnpack && unpackDir) {
+            shouldUnpack = isUnpackedDir(relativePath, unpackDir, unpackDirs);
+        }
+        return shouldUnpack;
+    };
+    // Batch-resolve metadata for files missing it (parallelized)
+    const missingMetadata = filenamesSorted.filter((f) => !metadata[f]);
+    if (missingMetadata.length > 0) {
+        const resolved = await Promise.all(missingMetadata.map(async (filename) => {
             const fileType = await determineFileType(filename);
@@ -106,27 +125,24 @@ if (!fileType) {
             }
+            return [filename, fileType];
+        }));
+        for (const [filename, fileType] of resolved) {
             metadata[filename] = fileType;
         }
+    }
+    // Process files in original sorted order to preserve header key ordering
+    for (const filename of filenamesSorted) {
         const file = metadata[filename];
-        const shouldUnpackPath = function (relativePath, unpack, unpackDir) {
-            let shouldUnpack = false;
-            if (unpack) {
-                shouldUnpack = minimatch(filename, unpack, { matchBase: true });
-            }
-            if (!shouldUnpack && unpackDir) {
-                shouldUnpack = isUnpackedDir(relativePath, unpackDir, unpackDirs);
-            }
-            return shouldUnpack;
-        };
         let shouldUnpack;
         switch (file.type) {
             case 'directory':
-                shouldUnpack = shouldUnpackPath(path.relative(src, filename), undefined, options.unpackDir);
+                shouldUnpack = shouldUnpackPath(filename, path.relative(src, filename), undefined, options.unpackDir);
                 filesystem.insertDirectory(filename, shouldUnpack);
                 break;
             case 'file':
-                shouldUnpack = shouldUnpackPath(path.relative(src, path.dirname(filename)), options.unpack, options.unpackDir);
+                shouldUnpack = shouldUnpackPath(filename, path.relative(src, path.dirname(filename)), options.unpack, options.unpackDir);
                 files.push({ filename, unpack: shouldUnpack });
-                return filesystem.insertFile(filename, () => fs.createReadStream(filename), shouldUnpack, file, options);
+                await filesystem.insertFile(filename, () => fs.createReadStream(filename), shouldUnpack, file, options);
+                break;
             case 'link':
-                shouldUnpack = shouldUnpackPath(path.relative(src, filename), options.unpack, options.unpackDir);
+                shouldUnpack = shouldUnpackPath(filename, path.relative(src, filename), options.unpack, options.unpackDir);
                 links.push({ filename, unpack: shouldUnpack });
@@ -136,17 +152,5 @@ filesystem.insertLink(filename, shouldUnpack);
         }
-        return Promise.resolve();
-    };
-    const insertsDone = async function () {
-        await fs.mkdirp(path.dirname(dest));
-        return writeFilesystem(dest, filesystem, { files, links }, metadata);
-    };
-    const names = filenamesSorted.slice();
-    const next = async function (name) {
-        if (!name) {
-            return insertsDone();
-        }
-        await handleFile(name);
-        return next(names.shift());
-    };
-    return next(names.shift());
+    }
+    await fs.mkdirp(path.dirname(dest));
+    return writeFilesystem(dest, filesystem, { files, links }, metadata);
 }
@@ -236,2 +240,18 @@ /**
     fs.mkdirpSync(dest);
+    // Read the entire data section at once — one syscall instead of one per file.
+    const headerSize = filesystem.getHeaderSize();
+    const archiveSize = fs.statSync(archivePath).size;
+    const dataStart = 8 + headerSize;
+    const dataSize = archiveSize - dataStart;
+    let dataBuf = null;
+    if (dataSize > 0) {
+        dataBuf = Buffer.alloc(dataSize);
+        const fd = fs.openSync(archivePath, 'r');
+        try {
+            fs.readSync(fd, dataBuf, 0, dataSize, dataStart);
+        }
+        finally {
+            fs.closeSync(fd);
+        }
+    }
     const extractionErrors = [];
@@ -269,3 +289,14 @@ for (const fullPath of filenames) {
             try {
-                const content = readFileSync(filesystem, filename, file);
+                let content;
+                if (file.unpacked) {
+                    content = fs.readFileSync(path.join(`${filesystem.getRootPath()}.unpacked`, filename));
+                }
+                else if (file.size <= 0) {
+                    content = Buffer.alloc(0);
+                }
+                else {
+                    // Slice from the pre-read data buffer — zero-copy view
+                    const offset = parseInt(file.offset);
+                    content = dataBuf.subarray(offset, offset + file.size);
+                }
                 fs.writeFileSync(destFilename, content);
@@ -272,0 +303,0 @@ if (file.executable) {

lib/asar.js.map

@@ -1,1 +0,1 @@
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lib/crawlfs.d.ts

@@ -10,4 +10,5 @@ import { GlobOptionsWithFileTypesFalse } from 'glob';
     };
+    cachedBuffer?: Buffer;
 };
 export declare function determineFileType(filename: string): Promise<CrawledFileType | null>;
 export declare function crawl(dir: string, options: GlobOptionsWithFileTypesFalse): Promise<readonly [string[], Record<string, CrawledFileType>]>;

lib/crawlfs.js

@@ -26,2 +26,3 @@ import { glob } from 'glob';
     const links = [];
+    const linkSet = new Set();
     const filenames = results
@@ -31,4 +32,6 @@ .map(([filename, type]) => {
             metadata[filename] = type;
-            if (type.type === 'link')
+            if (type.type === 'link') {
                 links.push(filename);
+                linkSet.add(filename);
+            }
         }
@@ -38,14 +41,18 @@ return filename;
         .filter((filename) => {
+        if (links.length === 0)
+            return true;
         // Newer glob can return files inside symlinked directories, to avoid
-        // those appearing in archives we need to manually exclude theme here
-        const exactLinkIndex = links.findIndex((link) => filename === link);
-        return links.every((link, index) => {
-            if (index === exactLinkIndex) {
-                return true;
+        // those appearing in archives we need to manually exclude them here
+        const isExactLink = linkSet.has(filename);
+        for (const link of links) {
+            if (isExactLink && filename === link)
+                continue;
+            if (filename.startsWith(link)) {
+                // symlink may point outside the directory: https://github.com/electron/asar/issues/303
+                const relativePath = path.relative(link, path.dirname(filename));
+                if (!relativePath.startsWith('..'))
+                    return false;
             }
-            const isFileWithinSymlinkDir = filename.startsWith(link);
-            // symlink may point outside the directory: https://github.com/electron/asar/issues/303
-            const relativePath = path.relative(link, path.dirname(filename));
-            return !isFileWithinSymlinkDir || relativePath.startsWith('..');
-        });
+        }
+        return true;
     });
@@ -52,0 +59,0 @@ return [filenames, metadata];

lib/crawlfs.js.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"crawlfs.js","sourceRoot":"","sources":["../src/crawlfs.ts"],"names":[],"mappings":"AAAA,OAAO,EAAE,IAAI,EAAiC,MAAM,MAAM,CAAC;AAE3D,OAAO,EAAE,SAAS,IAAI,EAAE,EAAE,MAAM,iBAAiB,CAAC;AAElD,OAAO,IAAI,MAAM,WAAW,CAAC;AAW7B,MAAM,CAAC,KAAK,UAAU,iBAAiB,CAAC,QAAgB;IACtD,MAAM,IAAI,GAAG,MAAM,EAAE,CAAC,KAAK,CAAC,QAAQ,CAAC,CAAC;IACtC,IAAI,IAAI,CAAC,MAAM,EAAE,EAAE,CAAC;QAClB,OAAO,EAAE,IAAI,EAAE,MAAM,EAAE,IAAI,EAAE,CAAC;IAChC,CAAC;SAAM,IAAI,IAAI,CAAC,WAAW,EAAE,EAAE,CAAC;QAC9B,OAAO,EAAE,IAAI,EAAE,WAAW,EAAE,IAAI,EAAE,CAAC;IACrC,CAAC;SAAM,IAAI,IAAI,CAAC,cAAc,EAAE,EAAE,CAAC;QACjC,OAAO,EAAE,IAAI,EAAE,MAAM,EAAE,IAAI,EAAE,CAAC;IAChC,CAAC;IACD,OAAO,IAAI,CAAC;AACd,CAAC;AAED,MAAM,CAAC,KAAK,UAAU,KAAK,CAAC,GAAW,EAAE,OAAsC;IAC7E,MAAM,QAAQ,GAAoC,EAAE,CAAC;IACrD,8BAA8B;IAC9B,MAAM,OAAO,GAAG,MAAM,IAAI,CAAC,GAAG,EAAE;QAC9B,oBAAoB,EAAE,IAAI;QAC1B,GAAG,OAAO;KACX,CAAC,CAAC;IACH,MAAM,OAAO,GAAG,MAAM,OAAO,CAAC,GAAG,CAC/B,OAAO,CAAC,IAAI,EAAE,CAAC,GAAG,CAAC,KAAK,EAAE,QAAQ,EAAE,EAAE,CAAC,CAAC,QAAQ,EAAE,MAAM,iBAAiB,CAAC,QAAQ,CAAC,CAAU,CAAC,CAC/F,CAAC;IACF,MAAM,KAAK,GAAa,EAAE,CAAC;IAC3B,MAAM,SAAS,GAAG,OAAO;SACtB,GAAG,CAAC,CAAC,CAAC,QAAQ,EAAE,IAAI,CAAC,EAAE,EAAE;QACxB,IAAI,IAAI,EAAE,CAAC;YACT,QAAQ,CAAC,QAAQ,CAAC,GAAG,IAAI,CAAC;YAC1B,IAAI,IAAI,CAAC,IAAI,KAAK,MAAM;gBAAE,KAAK,CAAC,IAAI,CAAC,QAAQ,CAAC,CAAC;QACjD,CAAC;QACD,OAAO,QAAQ,CAAC;IAClB,CAAC,CAAC;SACD,MAAM,CAAC,CAAC,QAAQ,EAAE,EAAE;QACnB,qEAAqE;QACrE,qEAAqE;QACrE,MAAM,cAAc,GAAG,KAAK,CAAC,SAAS,CAAC,CAAC,IAAI,EAAE,EAAE,CAAC,QAAQ,KAAK,IAAI,CAAC,CAAC;QACpE,OAAO,KAAK,CAAC,KAAK,CAAC,CAAC,IAAI,EAAE,KAAK,EAAE,EAAE;YACjC,IAAI,KAAK,KAAK,cAAc,EAAE,CAAC;gBAC7B,OAAO,IAAI,CAAC;YACd,CAAC;YACD,MAAM,sBAAsB,GAAG,QAAQ,CAAC,UAAU,CAAC,IAAI,CAAC,CAAC;YACzD,uFAAuF;YACvF,MAAM,YAAY,GAAG,IAAI,CAAC,QAAQ,CAAC,IAAI,EAAE,IAAI,CAAC,OAAO,CAAC,QAAQ,CAAC,CAAC,CAAC;YACjE,OAAO,CAAC,sBAAsB,IAAI,YAAY,CAAC,UAAU,CAAC,IAAI,CAAC,CAAC;QAClE,CAAC,CAAC,CAAC;IACL,CAAC,CAAC,CAAC;IACL,OAAO,CAAC,SAAS,EAAE,QAAQ,CAAU,CAAC;AACxC,CAAC"}
+{"version":3,"file":"crawlfs.js","sourceRoot":"","sources":["../src/crawlfs.ts"],"names":[],"mappings":"AAAA,OAAO,EAAE,IAAI,EAAiC,MAAM,MAAM,CAAC;AAE3D,OAAO,EAAE,SAAS,IAAI,EAAE,EAAE,MAAM,iBAAiB,CAAC;AAElD,OAAO,IAAI,MAAM,WAAW,CAAC;AAY7B,MAAM,CAAC,KAAK,UAAU,iBAAiB,CAAC,QAAgB;IACtD,MAAM,IAAI,GAAG,MAAM,EAAE,CAAC,KAAK,CAAC,QAAQ,CAAC,CAAC;IACtC,IAAI,IAAI,CAAC,MAAM,EAAE,EAAE,CAAC;QAClB,OAAO,EAAE,IAAI,EAAE,MAAM,EAAE,IAAI,EAAE,CAAC;IAChC,CAAC;SAAM,IAAI,IAAI,CAAC,WAAW,EAAE,EAAE,CAAC;QAC9B,OAAO,EAAE,IAAI,EAAE,WAAW,EAAE,IAAI,EAAE,CAAC;IACrC,CAAC;SAAM,IAAI,IAAI,CAAC,cAAc,EAAE,EAAE,CAAC;QACjC,OAAO,EAAE,IAAI,EAAE,MAAM,EAAE,IAAI,EAAE,CAAC;IAChC,CAAC;IACD,OAAO,IAAI,CAAC;AACd,CAAC;AAED,MAAM,CAAC,KAAK,UAAU,KAAK,CAAC,GAAW,EAAE,OAAsC;IAC7E,MAAM,QAAQ,GAAoC,EAAE,CAAC;IACrD,8BAA8B;IAC9B,MAAM,OAAO,GAAG,MAAM,IAAI,CAAC,GAAG,EAAE;QAC9B,oBAAoB,EAAE,IAAI;QAC1B,GAAG,OAAO;KACX,CAAC,CAAC;IACH,MAAM,OAAO,GAAG,MAAM,OAAO,CAAC,GAAG,CAC/B,OAAO,CAAC,IAAI,EAAE,CAAC,GAAG,CAAC,KAAK,EAAE,QAAQ,EAAE,EAAE,CAAC,CAAC,QAAQ,EAAE,MAAM,iBAAiB,CAAC,QAAQ,CAAC,CAAU,CAAC,CAC/F,CAAC;IACF,MAAM,KAAK,GAAa,EAAE,CAAC;IAC3B,MAAM,OAAO,GAAG,IAAI,GAAG,EAAU,CAAC;IAClC,MAAM,SAAS,GAAG,OAAO;SACtB,GAAG,CAAC,CAAC,CAAC,QAAQ,EAAE,IAAI,CAAC,EAAE,EAAE;QACxB,IAAI,IAAI,EAAE,CAAC;YACT,QAAQ,CAAC,QAAQ,CAAC,GAAG,IAAI,CAAC;YAC1B,IAAI,IAAI,CAAC,IAAI,KAAK,MAAM,EAAE,CAAC;gBACzB,KAAK,CAAC,IAAI,CAAC,QAAQ,CAAC,CAAC;gBACrB,OAAO,CAAC,GAAG,CAAC,QAAQ,CAAC,CAAC;YACxB,CAAC;QACH,CAAC;QACD,OAAO,QAAQ,CAAC;IAClB,CAAC,CAAC;SACD,MAAM,CAAC,CAAC,QAAQ,EAAE,EAAE;QACnB,IAAI,KAAK,CAAC,MAAM,KAAK,CAAC;YAAE,OAAO,IAAI,CAAC;QACpC,qEAAqE;QACrE,oEAAoE;QACpE,MAAM,WAAW,GAAG,OAAO,CAAC,GAAG,CAAC,QAAQ,CAAC,CAAC;QAC1C,KAAK,MAAM,IAAI,IAAI,KAAK,EAAE,CAAC;YACzB,IAAI,WAAW,IAAI,QAAQ,KAAK,IAAI;gBAAE,SAAS;YAC/C,IAAI,QAAQ,CAAC,UAAU,CAAC,IAAI,CAAC,EAAE,CAAC;gBAC9B,uFAAuF;gBACvF,MAAM,YAAY,GAAG,IAAI,CAAC,QAAQ,CAAC,IAAI,EAAE,IAAI,CAAC,OAAO,CAAC,QAAQ,CAAC,CAAC,CAAC;gBACjE,IAAI,CAAC,YAAY,CAAC,UAAU,CAAC,IAAI,CAAC;oBAAE,OAAO,KAAK,CAAC;YACnD,CAAC;QACH,CAAC;QACD,OAAO,IAAI,CAAC;IACd,CAAC,CAAC,CAAC;IACL,OAAO,CAAC,SAAS,EAAE,QAAQ,CAAU,CAAC;AACxC,CAAC"}

lib/disk.d.ts

@@ -45,1 +45,2 @@ import { Filesystem, FilesystemFileEntry } from './filesystem.js';
 export declare function readFileSync(filesystem: Filesystem, filename: string, info: FilesystemFileEntry): Buffer;
+export declare function readFileWithFd(fd: number, filesystem: Filesystem, filename: string, info: FilesystemFileEntry): Buffer;

lib/disk.js

@@ -26,5 +26,16 @@ import path from 'node:path';
     const { files, links } = lists;
+    // Batch cached buffers into a single write to avoid per-file write syscalls
+    let pendingBuffers = [];
+    const flushPendingBuffers = async () => {
+        if (pendingBuffers.length === 0)
+            return;
+        const combined = pendingBuffers.length === 1 ? pendingBuffers[0] : Buffer.concat(pendingBuffers);
+        pendingBuffers = [];
+        await new Promise((resolve, reject) => {
+            out.write(combined, (err) => (err ? reject(err) : resolve()));
+        });
+    };
     for (const file of files) {
         if (file.unpack) {
-            // the file should not be packed into archive
+            await flushPendingBuffers();
             const filename = path.relative(filesystem.getRootPath(), file.filename);
@@ -34,9 +45,17 @@ await copyFile(`${dest}.unpacked`, filesystem.getRootPath(), filename);
         else {
-            const transformed = metadata[file.filename].transformed;
-            const stream = fs.createReadStream(transformed ? transformed.path : file.filename);
-            await streamTransformedFile(stream, out);
+            const fileMeta = metadata[file.filename];
+            if (fileMeta.cachedBuffer) {
+                pendingBuffers.push(fileMeta.cachedBuffer);
+                fileMeta.cachedBuffer = undefined;
+            }
+            else {
+                await flushPendingBuffers();
+                const transformed = fileMeta.transformed;
+                const stream = fs.createReadStream(transformed ? transformed.path : file.filename);
+                await streamTransformedFile(stream, out);
+            }
         }
     }
+    await flushPendingBuffers();
     for (const file of links.filter((f) => f.unpack)) {
-        // the symlink needs to be recreated outside in .unpacked
         const filename = path.relative(filesystem.getRootPath(), file.filename);
@@ -144,2 +163,16 @@ const link = await fs.readlink(file.filename);
 }
+export function readFileWithFd(fd, filesystem, filename, info) {
+    let buffer = Buffer.alloc(info.size);
+    if (info.size <= 0) {
+        return buffer;
+    }
+    if (info.unpacked) {
+        buffer = fs.readFileSync(path.join(`${filesystem.getRootPath()}.unpacked`, filename));
+    }
+    else {
+        const offset = 8 + filesystem.getHeaderSize() + parseInt(info.offset);
+        fs.readSync(fd, buffer, 0, info.size, offset);
+    }
+    return buffer;
+}
 async function createFilesystemWriteStream(filesystem, dest) {
@@ -146,0 +179,0 @@ const headerPickle = Pickle.createEmpty();

lib/disk.js.map

@@ -1,1 +0,1 @@
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+{"version":3,"file":"disk.js","sourceRoot":"","sources":["../src/disk.ts"],"names":[],"mappings":"AAAA,OAAO,IAAI,MAAM,WAAW,CAAC;AAC7B,OAAO,EAAE,SAAS,IAAI,EAAE,EAAE,MAAM,iBAAiB,CAAC;AAClD,OAAO,EAAE,MAAM,EAAE,MAAM,aAAa,CAAC;AACrC,OAAO,EAAE,UAAU,EAAuB,MAAM,iBAAiB,CAAC;AAGlE,OAAO,MAAM,MAAM,sBAAsB,CAAC;AAE1C,IAAI,eAAe,GAA2C,MAAM,CAAC,MAAM,CAAC,IAAI,CAAC,CAAC;AAElF,KAAK,UAAU,QAAQ,CAAC,IAAY,EAAE,GAAW,EAAE,QAAgB;IACjE,MAAM,OAAO,GAAG,IAAI,CAAC,IAAI,CAAC,GAAG,EAAE,QAAQ,CAAC,CAAC;IACzC,MAAM,UAAU,GAAG,IAAI,CAAC,IAAI,CAAC,IAAI,EAAE,QAAQ,CAAC,CAAC;IAE7C,MAAM,CAAC,OAAO,EAAE,KAAK,CAAC,GAAG,MAAM,OAAO,CAAC,GAAG,CAAC;QACzC,EAAE,CAAC,QAAQ,CAAC,OAAO,CAAC;QACpB,EAAE,CAAC,IAAI,CAAC,OAAO,CAAC;QAChB,EAAE,CAAC,MAAM,CAAC,IAAI,CAAC,OAAO,CAAC,UAAU,CAAC,CAAC;KACpC,CAAC,CAAC;IACH,OAAO,EAAE,CAAC,SAAS,CAAC,UAAU,EAAE,OAAO,EAAE,EAAE,IAAI,EAAE,KAAK,CAAC,IAAI,EAAE,CAAC,CAAC;AACjE,CAAC;AAED,KAAK,UAAU,qBAAqB,CAClC,MAA6B,EAC7B,SAAgC;IAEhC,OAAO,IAAI,OAAO,CAAO,CAAC,OAAO,EAAE,MAAM,EAAE,EAAE;QAC3C,MAAM,CAAC,IAAI,CAAC,SAAS,EAAE,EAAE,GAAG,EAAE,KAAK,EAAE,CAAC,CAAC;QACvC,MAAM,CAAC,EAAE,CAAC,OAAO,EAAE,MAAM,CAAC,CAAC;QAC3B,MAAM,CAAC,EAAE,CAAC,KAAK,EAAE,GAAG,EAAE,CAAC,OAAO,EAAE,CAAC,CAAC;IACpC,CAAC,CAAC,CAAC;AACL,CAAC;AAwBD,MAAM,qBAAqB,GAAG,KAAK,WACjC,IAAY,EACZ,UAAsB,EACtB,GAA0B,EAC1B,KAA+C,EAC/C,QAAuB;IAEvB,MAAM,EAAE,KAAK,EAAE,KAAK,EAAE,GAAG,KAAK,CAAC;IAE/B,4EAA4E;IAC5E,IAAI,cAAc,GAAa,EAAE,CAAC;IAElC,MAAM,mBAAmB,GAAG,KAAK,IAAI,EAAE;QACrC,IAAI,cAAc,CAAC,MAAM,KAAK,CAAC;YAAE,OAAO;QACxC,MAAM,QAAQ,GACZ,cAAc,CAAC,MAAM,KAAK,CAAC,CAAC,CAAC,CAAC,cAAc,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,MAAM,CAAC,MAAM,CAAC,cAAc,CAAC,CAAC;QAClF,cAAc,GAAG,EAAE,CAAC;QACpB,MAAM,IAAI,OAAO,CAAO,CAAC,OAAO,EAAE,MAAM,EAAE,EAAE;YAC1C,GAAG,CAAC,KAAK,CAAC,QAAQ,EAAE,CAAC,GAAG,EAAE,EAAE,CAAC,CAAC,GAAG,CAAC,CAAC,CAAC,MAAM,CAAC,GAAG,CAAC,CAAC,CAAC,CAAC,OAAO,EAAE,CAAC,CAAC,CAAC;QAChE,CAAC,CAAC,CAAC;IACL,CAAC,CAAC;IAEF,KAAK,MAAM,IAAI,IAAI,KAAK,EAAE,CAAC;QACzB,IAAI,IAAI,CAAC,MAAM,EAAE,CAAC;YAChB,MAAM,mBAAmB,EAAE,CAAC;YAC5B,MAAM,QAAQ,GAAG,IAAI,CAAC,QAAQ,CAAC,UAAU,CAAC,WAAW,EAAE,EAAE,IAAI,CAAC,QAAQ,CAAC,CAAC;YACxE,MAAM,QAAQ,CAAC,GAAG,IAAI,WAAW,EAAE,UAAU,CAAC,WAAW,EAAE,EAAE,QAAQ,CAAC,CAAC;QACzE,CAAC;aAAM,CAAC;YACN,MAAM,QAAQ,GAAG,QAAQ,CAAC,IAAI,CAAC,QAAQ,CAAC,CAAC;YACzC,IAAI,QAAQ,CAAC,YAAY,EAAE,CAAC;gBAC1B,cAAc,CAAC,IAAI,CAAC,QAAQ,CAAC,YAAY,CAAC,CAAC;gBAC3C,QAAQ,CAAC,YAAY,GAAG,SAAS,CAAC;YACpC,CAAC;iBAAM,CAAC;gBACN,MAAM,mBAAmB,EAAE,CAAC;gBAC5B,MAAM,WAAW,GAAG,QAAQ,CAAC,WAAW,CAAC;gBACzC,MAAM,MAAM,GAAG,EAAE,CAAC,gBAAgB,CAAC,WAAW,CAAC,CAAC,CAAC,WAAW,CAAC,IAAI,CAAC,CAAC,CAAC,IAAI,CAAC,QAAQ,CAAC,CAAC;gBACnF,MAAM,qBAAqB,CAAC,MAAM,EAAE,GAAG,CAAC,CAAC;YAC3C,CAAC;QACH,CAAC;IACH,CAAC;IACD,MAAM,mBAAmB,EAAE,CAAC;IAE5B,KAAK,MAAM,IAAI,IAAI,KAAK,CAAC,MAAM,CAAC,CAAC,CAAC,EAAE,EAAE,CAAC,CAAC,CAAC,MAAM,CAAC,EAAE,CAAC;QACjD,MAAM,QAAQ,GAAG,IAAI,CAAC,QAAQ,CAAC,UAAU,CAAC,WAAW,EAAE,EAAE,IAAI,CAAC,QAAQ,CAAC,CAAC;QACxE,MAAM,IAAI,GAAG,MAAM,EAAE,CAAC,QAAQ,CAAC,IAAI,CAAC,QAAQ,CAAC,CAAC;QAC9C,MAAM,aAAa,CAAC,IAAI,EAAE,QAAQ,EAAE,IAAI,CAAC,CAAC;IAC5C,CAAC;IACD,OAAO,IAAI,OAAO,CAAO,CAAC,OAAO,EAAE,MAAM,EAAE,EAAE;QAC3C,GAAG,CAAC,EAAE,CAAC,OAAO,EAAE,MAAM,CAAC,CAAC;QACxB,GAAG,CAAC,GAAG,CAAC,GAAG,EAAE,CAAC,OAAO,EAAE,CAAC,CAAC;IAC3B,CAAC,CAAC,CAAC;AACL,CAAC,CAAC;AAEF,MAAM,CAAC,KAAK,UAAU,eAAe,CACnC,IAAY,EACZ,UAAsB,EACtB,KAA+C,EAC/C,QAAuB;IAEvB,MAAM,GAAG,GAAG,MAAM,2BAA2B,CAAC,UAAU,EAAE,IAAI,CAAC,CAAC;IAChE,OAAO,qBAAqB,CAAC,IAAI,EAAE,UAAU,EAAE,GAAG,EAAE,KAAK,EAAE,QAAQ,CAAC,CAAC;AACvE,CAAC;AAED,MAAM,CAAC,KAAK,UAAU,gBAAgB,CACpC,IAAY,EACZ,UAAsB,EACtB,KAAgD;IAEhD,MAAM,GAAG,GAAG,MAAM,2BAA2B,CAAC,UAAU,EAAE,IAAI,CAAC,CAAC;IAEhE,MAAM,EAAE,KAAK,EAAE,KAAK,EAAE,GAAG,KAAK,CAAC;IAC/B,IAAI,KAAK,EAAE,MAAM,IAAI,IAAI,KAAK,EAAE,CAAC;QAC/B,6CAA6C;QAC7C,IAAI,IAAI,CAAC,MAAM,EAAE,CAAC;YAChB,MAAM,UAAU,GAAG,IAAI,CAAC,IAAI,CAAC,GAAG,IAAI,WAAW,EAAE,IAAI,CAAC,QAAQ,CAAC,CAAC;YAChE,MAAM,EAAE,CAAC,MAAM,CAAC,IAAI,CAAC,OAAO,CAAC,UAAU,CAAC,CAAC,CAAC;YAC1C,MAAM,WAAW,GAAG,EAAE,CAAC,iBAAiB,CAAC,UAAU,EAAE,EAAE,IAAI,EAAE,IAAI,CAAC,IAAI,EAAE,CAAC,CAAC;YAC1E,MAAM,MAAM,CAAC,QAAQ,CAAC,IAAI,CAAC,eAAe,EAAE,EAAE,WAAW,CAAC,CAAC;QAC7D,CAAC;aAAM,CAAC;YACN,MAAM,qBAAqB,CAAC,IAAI,CAAC,eAAe,EAAE,EAAE,GAAG,CAAC,CAAC;QAC3D,CAAC;IACH,CAAC;IAED,KAAK,MAAM,IAAI,IAAI,KAAK,CAAC,MAAM,CAAC,CAAC,CAAC,EAAE,EAAE,CAAC,CAAC,CAAC,MAAM,IAAI,CAAC,CAAC,IAAI,CAAC,EAAE,CAAC;QAC3D,yDAAyD;QACzD,MAAM,aAAa,CAAC,IAAI,EAAE,IAAI,CAAC,QAAQ,EAAE,IAAI,CAAC,IAAK,CAAC,CAAC;IACvD,CAAC;IACD,OAAO,IAAI,OAAO,CAAO,CAAC,OAAO,EAAE,MAAM,EAAE,EAAE;QAC3C,GAAG,CAAC,EAAE,CAAC,OAAO,EAAE,MAAM,CAAC,CAAC;QACxB,GAAG,CAAC,GAAG,CAAC,GAAG,EAAE,CAAC,OAAO,EAAE,CAAC,CAAC;IAC3B,CAAC,CAAC,CAAC;AACL,CAAC;AAsBD,MAAM,UAAU,qBAAqB,CAAC,WAAmB;IACvD,MAAM,EAAE,GAAG,EAAE,CAAC,QAAQ,CAAC,WAAW,EAAE,GAAG,CAAC,CAAC;IACzC,IAAI,IAAY,CAAC;IACjB,IAAI,SAAiB,CAAC;IACtB,IAAI,CAAC;QACH,MAAM,OAAO,GAAG,MAAM,CAAC,KAAK,CAAC,CAAC,CAAC,CAAC;QAChC,IAAI,EAAE,CAAC,QAAQ,CAAC,EAAE,EAAE,OAAO,EAAE,CAAC,EAAE,CAAC,EAAE,IAAI,CAAC,KAAK,CAAC,EAAE,CAAC;YAC/C,MAAM,IAAI,KAAK,CAAC,4BAA4B,CAAC,CAAC;QAChD,CAAC;QAED,MAAM,UAAU,GAAG,MAAM,CAAC,gBAAgB,CAAC,OAAO,CAAC,CAAC;QACpD,IAAI,GAAG,UAAU,CAAC,cAAc,EAAE,CAAC,U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lib/filesystem.d.ts

@@ -36,2 +36,3 @@ import { FileIntegrity } from './integrity.js';
     }): Promise<void>;
+    private insertFileAsync;
     insertLink(p: string, shouldUnpack: boolean, parentPath?: string, symlink?: string, // /var/tmp => /private/var
@@ -38,0 +39,0 @@ src?: string): string;

lib/filesystem.js

 import os from 'node:os';
 import path from 'node:path';
 import stream from 'node:stream/promises';
-import { getFileIntegrity } from './integrity.js';
+import { getFileIntegrity, getFileIntegrityFromBuffer } from './integrity.js';
 import { wrappedFs as fs } from './wrapped-fs.js';
 const UINT32_MAX = 2 ** 32 - 1;
+// Files smaller than this use buffer-based integrity hashing (avoids stream overhead).
+// Files larger than this use streaming to avoid holding large buffers in memory.
+const BUFFER_HASH_THRESHOLD = 2 * 1024 * 1024; // 2MB
 export class Filesystem {
@@ -72,3 +75,3 @@ src;
     }
-    async insertFile(p, streamGenerator, shouldUnpack, file, options = {}) {
+    insertFile(p, streamGenerator, shouldUnpack, file, options = {}) {
         const dirNode = this.searchNodeFromPath(path.dirname(p));
@@ -79,21 +82,11 @@ const node = this.searchNodeFromPath(p);
             node.unpacked = true;
-            node.integrity = await getFileIntegrity(streamGenerator());
-            return Promise.resolve();
+            return getFileIntegrity(streamGenerator()).then((integrity) => {
+                node.integrity = integrity;
+            });
         }
-        let size;
         const transformed = options.transform && options.transform(p);
         if (transformed) {
-            const tmpdir = await fs.mkdtemp(path.join(os.tmpdir(), 'asar-'));
-            const tmpfile = path.join(tmpdir, path.basename(p));
-            const out = fs.createWriteStream(tmpfile);
-            await stream.pipeline(streamGenerator(), transformed, out);
-            file.transformed = {
-                path: tmpfile,
-                stat: await fs.lstat(tmpfile),
-            };
-            size = file.transformed.stat.size;
+            return this.insertFileAsync(p, streamGenerator, file, node, transformed);
         }
-        else {
-            size = file.stat.size;
-        }
+        const size = file.stat.size;
         // JavaScript cannot precisely present integers >= UINT32_MAX.
@@ -105,6 +98,42 @@ if (size > UINT32_MAX) {
         node.offset = this.offset.toString();
-        node.integrity = await getFileIntegrity(streamGenerator());
         if (process.platform !== 'win32' && file.stat.mode & 0o100) {
             node.executable = true;
         }
+        if (size <= BUFFER_HASH_THRESHOLD) {
+            // Fully synchronous fast path — no Promise, no stream, no microtask yield
+            try {
+                const fileBuffer = fs.readFileSync(p);
+                node.integrity = getFileIntegrityFromBuffer(fileBuffer);
+                file.cachedBuffer = fileBuffer;
+                this.offset += BigInt(size);
+                return Promise.resolve();
+            }
+            catch {
+                // Fall through to stream path
+            }
+        }
+        return getFileIntegrity(streamGenerator()).then((integrity) => {
+            node.integrity = integrity;
+            this.offset += BigInt(size);
+        });
+    }
+    async insertFileAsync(p, streamGenerator, file, node, transformed) {
+        const tmpdir = await fs.mkdtemp(path.join(os.tmpdir(), 'asar-'));
+        const tmpfile = path.join(tmpdir, path.basename(p));
+        const out = fs.createWriteStream(tmpfile);
+        await stream.pipeline(streamGenerator(), transformed, out);
+        file.transformed = {
+            path: tmpfile,
+            stat: await fs.lstat(tmpfile),
+        };
+        const size = file.transformed.stat.size;
+        if (size > UINT32_MAX) {
+            throw new Error(`${p}: file size can not be larger than 4.2GB`);
+        }
+        node.size = size;
+        node.offset = this.offset.toString();
+        if (process.platform !== 'win32' && file.stat.mode & 0o100) {
+            node.executable = true;
+        }
+        node.integrity = await getFileIntegrity(streamGenerator());
         this.offset += BigInt(size);
@@ -111,0 +140,0 @@ }

lib/filesystem.js.map

@@ -1,1 +0,1 @@
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lib/integrity.d.ts

@@ -8,1 +8,2 @@ export type FileIntegrity = {
 export declare function getFileIntegrity(inputFileStream: NodeJS.ReadableStream): Promise<FileIntegrity>;
+export declare function getFileIntegrityFromBuffer(data: Buffer): FileIntegrity;

lib/integrity.js

@@ -7,10 +7,7 @@ import crypto from 'node:crypto';
 const BLOCK_SIZE = 4 * 1024 * 1024;
-function hashBlock(block) {
-    return crypto.createHash(ALGORITHM).update(block).digest('hex');
-}
 export async function getFileIntegrity(inputFileStream) {
     const fileHash = crypto.createHash(ALGORITHM);
     const blockHashes = [];
+    let blockHash = crypto.createHash(ALGORITHM);
     let currentBlockSize = 0;
-    let currentBlock = [];
     await streamPromises.pipeline(inputFileStream, new stream.PassThrough({
@@ -20,16 +17,16 @@ decodeStrings: false,
             fileHash.update(_chunk);
-            function handleChunk(chunk) {
-                const diffToSlice = Math.min(BLOCK_SIZE - currentBlockSize, chunk.byteLength);
-                currentBlockSize += diffToSlice;
-                currentBlock.push(chunk.slice(0, diffToSlice));
+            let offset = 0;
+            while (offset < _chunk.byteLength) {
+                const remaining = BLOCK_SIZE - currentBlockSize;
+                const end = Math.min(offset + remaining, _chunk.byteLength);
+                const slice = offset === 0 && end === _chunk.byteLength ? _chunk : _chunk.subarray(offset, end);
+                blockHash.update(slice);
+                currentBlockSize += end - offset;
                 if (currentBlockSize === BLOCK_SIZE) {
-                    blockHashes.push(hashBlock(Buffer.concat(currentBlock)));
-                    currentBlock = [];
+                    blockHashes.push(blockHash.digest('hex'));
+                    blockHash = crypto.createHash(ALGORITHM);
                     currentBlockSize = 0;
                 }
-                if (diffToSlice < chunk.byteLength) {
-                    handleChunk(chunk.slice(diffToSlice));
-                }
+                offset = end;
             }
-            handleChunk(_chunk);
             callback();
@@ -39,4 +36,3 @@ },
             if (currentBlockSize > 0 || blockHashes.length === 0) {
-                blockHashes.push(hashBlock(Buffer.concat(currentBlock)));
-                currentBlock = [];
+                blockHashes.push(blockHash.digest('hex'));
             }
@@ -53,2 +49,14 @@ callback();
 }
+export function getFileIntegrityFromBuffer(data) {
+    const hash = crypto.createHash(ALGORITHM).update(data).digest('hex');
+    const blocks = [];
+    for (let offset = 0; offset < data.length; offset += BLOCK_SIZE) {
+        const end = Math.min(offset + BLOCK_SIZE, data.length);
+        blocks.push(crypto.createHash(ALGORITHM).update(data.subarray(offset, end)).digest('hex'));
+    }
+    if (data.length === 0) {
+        blocks.push(crypto.createHash(ALGORITHM).update(data).digest('hex'));
+    }
+    return { algorithm: ALGORITHM, hash, blockSize: BLOCK_SIZE, blocks };
+}
 //# sourceMappingURL=integrity.js.map

lib/integrity.js.map

@@ -1,1 +0,1 @@
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package.json

 {
   "name": "@electron/asar",
   "description": "Creating Electron app packages",
-  "version": "4.1.1",
+  "version": "4.1.2",
   "type": "module",
@@ -39,2 +39,4 @@ "exports": "./lib/asar.js",
     "prettier:write": "yarn prettier --write",
+    "benchmark": "yarn build && npx tsx benchmark/run.ts",
+    "benchmark:quick": "yarn build && npx tsx benchmark/run.ts small",
     "prepack": "yarn build",
@@ -41,0 +43,0 @@ "prepare": "husky"

No alert changes

Improved metrics

Total package byte prevSize

127633

7.94%

Lines of code

1761

6.79%

No dependency changes