Merged esm branch into feature-magic. Ported FileType ops.

src/core/operations/ZlibInflate.mjs

@@ -0,0 +1,88 @@
+/**
+ * @author n1474335 [n1474335@gmail.com]
+ * @copyright Crown Copyright 2016
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation";
+import {INFLATE_BUFFER_TYPE} from "../lib/Zlib";
+import zlibAndGzip from "zlibjs/bin/zlib_and_gzip.min";
+
+const Zlib = zlibAndGzip.Zlib;
+
+const ZLIB_BUFFER_TYPE_LOOKUP = {
+    "Adaptive": Zlib.Inflate.BufferType.ADAPTIVE,
+    "Block":    Zlib.Inflate.BufferType.BLOCK,
+};
+
+/**
+ * Zlib Inflate operation
+ */
+class ZlibInflate extends Operation {
+
+    /**
+     * ZlibInflate constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "Zlib Inflate";
+        this.module = "Compression";
+        this.description = "Decompresses data which has been compressed using the deflate algorithm with zlib headers.";
+        this.inputType = "ArrayBuffer";
+        this.outputType = "ArrayBuffer";
+        this.args = [
+            {
+                name: "Start index",
+                type: "number",
+                value: 0
+            },
+            {
+                name: "Initial output buffer size",
+                type: "number",
+                value: 0
+            },
+            {
+                name: "Buffer expansion type",
+                type: "option",
+                value: INFLATE_BUFFER_TYPE
+            },
+            {
+                name: "Resize buffer after decompression",
+                type: "boolean",
+                value: false
+            },
+            {
+                name: "Verify result",
+                type: "boolean",
+                value: false
+            }
+        ];
+        this.patterns = [
+            {
+                match: "^\\x78(\\x01|\\x9c|\\xda|\\x5e)",
+                flags: "",
+                args: [0, 0, "Adaptive", false, false]
+            },
+        ];
+    }
+
+    /**
+     * @param {ArrayBuffer} input
+     * @param {Object[]} args
+     * @returns {ArrayBuffer}
+     */
+    run(input, args) {
+        const inflate = new Zlib.Inflate(new Uint8Array(input), {
+            index: args[0],
+            bufferSize: args[1],
+            bufferType: ZLIB_BUFFER_TYPE_LOOKUP[args[2]],
+            resize: args[3],
+            verify: args[4]
+        });
+        return new Uint8Array(inflate.decompress()).buffer;
+    }
+
+}
+
+export default ZlibInflate;