test

vscode-server-linux-x64-web/node_modules/@xterm/addon-image/out/IIPMetrics.js

@@ -0,0 +1,70 @@
+"use strict";
+/**
+ * Copyright (c) 2023 The xterm.js authors. All rights reserved.
+ * @license MIT
+ */
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.imageType = exports.UNSUPPORTED_TYPE = void 0;
+exports.UNSUPPORTED_TYPE = {
+    mime: 'unsupported',
+    width: 0,
+    height: 0
+};
+function imageType(d) {
+    if (d.length < 24) {
+        return exports.UNSUPPORTED_TYPE;
+    }
+    const d32 = new Uint32Array(d.buffer, d.byteOffset, 6);
+    // PNG: 89 50 4E 47 0D 0A 1A 0A (8 first bytes == magic number for PNG)
+    // + first chunk must be IHDR
+    if (d32[0] === 0x474E5089 && d32[1] === 0x0A1A0A0D && d32[3] === 0x52444849) {
+        return {
+            mime: 'image/png',
+            width: d[16] << 24 | d[17] << 16 | d[18] << 8 | d[19],
+            height: d[20] << 24 | d[21] << 16 | d[22] << 8 | d[23]
+        };
+    }
+    // JPEG: FF D8 FF E0 xx xx JFIF  or  FF D8 FF E1 xx xx Exif 00 00
+    if ((d32[0] === 0xE0FFD8FF || d32[0] === 0xE1FFD8FF)
+        && ((d[6] === 0x4a && d[7] === 0x46 && d[8] === 0x49 && d[9] === 0x46)
+            || (d[6] === 0x45 && d[7] === 0x78 && d[8] === 0x69 && d[9] === 0x66))) {
+        const [width, height] = jpgSize(d);
+        return { mime: 'image/jpeg', width, height };
+    }
+    // GIF: GIF87a or GIF89a
+    if (d32[0] === 0x38464947 && (d[4] === 0x37 || d[4] === 0x39) && d[5] === 0x61) {
+        return {
+            mime: 'image/gif',
+            width: d[7] << 8 | d[6],
+            height: d[9] << 8 | d[8]
+        };
+    }
+    return exports.UNSUPPORTED_TYPE;
+}
+exports.imageType = imageType;
+function jpgSize(d) {
+    const len = d.length;
+    let i = 4;
+    let blockLength = d[i] << 8 | d[i + 1];
+    while (true) {
+        i += blockLength;
+        if (i >= len) {
+            // exhausted without size info
+            return [0, 0];
+        }
+        if (d[i] !== 0xFF) {
+            return [0, 0];
+        }
+        if (d[i + 1] === 0xC0 || d[i + 1] === 0xC2) {
+            if (i + 8 < len) {
+                return [
+                    d[i + 7] << 8 | d[i + 8],
+                    d[i + 5] << 8 | d[i + 6]
+                ];
+            }
+            return [0, 0];
+        }
+        i += 2;
+        blockLength = d[i] << 8 | d[i + 1];
+    }
+}