Update gitignore (sorry)

electron/node_modules/dir-compare/src/fileCompareHandler/defaultFileCompare.js

@@ -0,0 +1,113 @@
+var fs = require('fs')
+var bufferEqual = require('buffer-equal')
+var FileDescriptorQueue = require('../fs/FileDescriptorQueue')
+var closeFilesSync = require('./closeFile').closeFilesSync
+var closeFilesAsync = require('./closeFile').closeFilesAsync
+var fsPromise = require('../fs/fsPromise')
+var BufferPool = require('../fs/BufferPool')
+
+var MAX_CONCURRENT_FILE_COMPARE = 8
+var BUF_SIZE = 100000
+var fdQueue = new FileDescriptorQueue(MAX_CONCURRENT_FILE_COMPARE * 2)
+var bufferPool = new BufferPool(BUF_SIZE, MAX_CONCURRENT_FILE_COMPARE);  // fdQueue guarantees there will be no more than MAX_CONCURRENT_FILE_COMPARE async processes accessing the buffers concurrently
+
+
+/**
+ * Compares two partial buffers.
+ */
+var compareBuffers = function (buf1, buf2, contentSize) {
+    return bufferEqual(buf1.slice(0, contentSize), buf2.slice(0, contentSize))
+}
+
+/**
+ * Compares two files by content.
+ */
+var compareSync = function (path1, stat1, path2, stat2, options) {
+    var fd1, fd2
+    if (stat1.size !== stat2.size) {
+        return false
+    }
+    var bufferPair = bufferPool.allocateBuffers()
+    try {
+        fd1 = fs.openSync(path1, 'r')
+        fd2 = fs.openSync(path2, 'r')
+        var buf1 = bufferPair.buf1
+        var buf2 = bufferPair.buf2
+        var progress = 0
+        while (true) {
+            var size1 = fs.readSync(fd1, buf1, 0, BUF_SIZE, null)
+            var size2 = fs.readSync(fd2, buf2, 0, BUF_SIZE, null)
+            if (size1 !== size2) {
+                return false
+            } else if (size1 === 0) {
+                // End of file reached
+                return true
+            } else if (!compareBuffers(buf1, buf2, size1)) {
+                return false
+            }
+        }
+    } finally {
+        closeFilesSync(fd1, fd2)
+        bufferPool.freeBuffers(bufferPair)
+    }
+}
+
+
+/**
+ * Compares two files by content
+ */
+var compareAsync = function (path1, stat1, path2, stat2, options) {
+    var fd1, fd2
+    var bufferPair
+    if (stat1.size !== stat2.size) {
+        return Promise.resolve(false)
+    }
+    return Promise.all([fdQueue.promises.open(path1, 'r'), fdQueue.promises.open(path2, 'r')])
+        .then(function (fds) {
+            bufferPair = bufferPool.allocateBuffers()
+            fd1 = fds[0]
+            fd2 = fds[1]
+            var buf1 = bufferPair.buf1
+            var buf2 = bufferPair.buf2
+            var progress = 0
+            var compareAsyncInternal = function () {
+                return Promise.all([
+                    fsPromise.read(fd1, buf1, 0, BUF_SIZE, null),
+                    fsPromise.read(fd2, buf2, 0, BUF_SIZE, null)
+                ]).then(function (bufferSizes) {
+                    var size1 = bufferSizes[0]
+                    var size2 = bufferSizes[1]
+                    if (size1 !== size2) {
+                        return false
+                    } else if (size1 === 0) {
+                        // End of file reached
+                        return true
+                    } else if (!compareBuffers(buf1, buf2, size1)) {
+                        return false
+                    } else {
+                        return compareAsyncInternal()
+                    }
+                })
+            }
+            return compareAsyncInternal()
+        })
+        .then(
+            // 'finally' polyfill for node 8 and below
+            function (res) {
+                return finalizeAsync(fd1, fd2, bufferPair).then(() => res)
+            },
+            function (err) {
+                return finalizeAsync(fd1, fd2, bufferPair).then(() => { throw err; })
+            }
+        )
+}
+
+function finalizeAsync(fd1, fd2, bufferPair) {
+    bufferPool.freeBuffers(bufferPair)
+    return closeFilesAsync(fd1, fd2, fdQueue)
+}
+
+module.exports = {
+    compareSync: compareSync,
+    compareAsync: compareAsync
+}