initial commit of actions

github/codeql-action-v2/node_modules/unzip-stream/lib/matcher-stream.js

@@ -0,0 +1,94 @@
+var Transform = require('stream').Transform;
+var util = require('util');
+
+function MatcherStream(patternDesc, matchFn) {
+    if (!(this instanceof MatcherStream)) {
+        return new MatcherStream();
+    }
+
+    Transform.call(this);
+
+    var p = typeof patternDesc === 'object' ? patternDesc.pattern : patternDesc;
+
+    this.pattern = Buffer.isBuffer(p) ? p : Buffer.from(p);
+    this.requiredLength = this.pattern.length;
+    if (patternDesc.requiredExtraSize) this.requiredLength += patternDesc.requiredExtraSize;
+
+    this.data = new Buffer('');
+    this.bytesSoFar = 0;
+
+    this.matchFn = matchFn;
+}
+
+util.inherits(MatcherStream, Transform);
+
+MatcherStream.prototype.checkDataChunk = function (ignoreMatchZero) {
+    var enoughData = this.data.length >= this.requiredLength; // strict more than ?
+    if (!enoughData) { return; }
+
+    var matchIndex = this.data.indexOf(this.pattern, ignoreMatchZero ? 1 : 0);
+    if (matchIndex >= 0 && matchIndex + this.requiredLength > this.data.length) {
+        if (matchIndex > 0) {
+            var packet = this.data.slice(0, matchIndex);
+            this.push(packet);
+            this.bytesSoFar += matchIndex;
+            this.data = this.data.slice(matchIndex);
+        }
+        return;
+    }
+
+    if (matchIndex === -1) {
+        var packetLen = this.data.length - this.requiredLength + 1;
+
+        var packet = this.data.slice(0, packetLen);
+        this.push(packet);
+        this.bytesSoFar += packetLen;
+        this.data = this.data.slice(packetLen);
+        return;
+    }
+
+    // found match
+    if (matchIndex > 0) {
+        var packet = this.data.slice(0, matchIndex);
+        this.data = this.data.slice(matchIndex);
+        this.push(packet);
+        this.bytesSoFar += matchIndex;
+    }
+
+    var finished = this.matchFn ? this.matchFn(this.data, this.bytesSoFar) : true;
+    if (finished) {
+        this.data = new Buffer('');
+        return;
+    }
+
+    return true;
+}
+
+MatcherStream.prototype._transform = function (chunk, encoding, cb) {
+    this.data = Buffer.concat([this.data, chunk]);
+
+    var firstIteration = true;
+    while (this.checkDataChunk(!firstIteration)) {
+        firstIteration = false;
+    }
+
+    cb();
+}
+
+MatcherStream.prototype._flush = function (cb) {
+    if (this.data.length > 0) {
+        var firstIteration = true;
+        while (this.checkDataChunk(!firstIteration)) {
+            firstIteration = false;
+        }
+    }
+
+    if (this.data.length > 0) {
+        this.push(this.data);
+        this.data = null;
+    }
+
+    cb();
+}
+
+module.exports = MatcherStream;