decode-tiff - npm Package Compare versions

Comparing version 0.2.0 to 0.2.1

lib/index.js

@@ -28,3 +28,4 @@ "use strict";
   0x0117: "stripByteCounts",
-  0x0128: "resolutionUnit"
+  0x0128: "resolutionUnit",
+  0x0140: "colorMap"
 };
@@ -187,6 +188,8 @@
   function readStrips(ifdEntries) {
-    var ret = new Uint8Array(ifdEntries.imageWidth[0] * ifdEntries.imageLength[0] * ifdEntries.bitsPerSample.length);
+    var ret = new Uint8Array(ifdEntries.stripByteCounts.reduce(function (s, b) {
+      return s + b;
+    }, 0));
     var copiedBl = 0;
     for (var s = 0; s < ifdEntries.stripOffsets.length; s++) {
-      var x = buf.subarray(ifdEntries.stripOffsets[s], ifdEntries.stripByteCounts[s]);
+      var x = buf.subarray(ifdEntries.stripOffsets[s], ifdEntries.stripOffsets[s] + ifdEntries.stripByteCounts[s]);
       ret.set(x, copiedBl);
@@ -246,12 +249,38 @@ copiedBl += x.byteLength;
 
+function decompressData(ifdEntries, stripData) {
+  var compression = ifdEntries.compression;
+
+  if (!compression || compression[0] === 1) {
+    // no-compress
+    return stripData;
+  } else if (compression[0] === 2) {
+    // CCITT Group 3
+    throw new Error("CCITT group3 decompressionion is not implemented.");
+  } else if (compression[0] === 5) {
+    // LZW
+    throw new Error("LZW decompressionion is not implemented.");
+  } else if (compression[0] === 6) {
+    // JPEG
+    throw new Error("JPEG decompressionion is not implemented.");
+  } else if (compression[0] === 7) {
+    // JPEG2
+    throw new Error("JPEG2 decompressionion is not implemented.");
+  } else if (compression[0] === 8) {
+    // Zip(Adobe Deflate)
+    throw new Error("Zip (Adove Deflate) decompressionion is not implemented.");
+  } else if (compression[0] === 32773) {
+    // Packbits
+    throw new Error("Packbits decompression is not implemented.");
+  } else {
+    throw new Error("Unknown compression type: " + compression[0]);
+  }
+}
+
 function normalizeStripData(ifdEntries, stripData) {
   var colorMap = ifdEntries.colorMap,
       bitsPerSample = ifdEntries.bitsPerSample,
-      compression = ifdEntries.compression,
       photometricInterpretation = ifdEntries.photometricInterpretation;
 
   var x = void 0;
-  if (compression && compression[0] !== 1) {
-    throw new Error("Compression is not implemented.");
-  }
+  stripData = decompressData(ifdEntries, stripData);
   if (!bitsPerSample) {
@@ -296,2 +325,4 @@ throw new Error("Bilevel image decode is not implemented.");
     return x;
+  } else {
+    throw new Error("Can't detect image type. PhotometricInterpretation: " + photometricInterpretation[0] + ", BitsPerSample: " + bitsPerSample);
   }
@@ -298,0 +329,0 @@ }

package.json

 {
   "name": "decode-tiff",
-  "version": "0.2.0",
+  "version": "0.2.1",
   "description": "Lightweight tiff decoder",
@@ -5,0 +5,0 @@ "main": "lib/index.js",

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Major refactor

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Total package byte prevSize

1356063

increased by0.08%

Lines of code

330

increased by9.63%

Number of medium supply chain risk alerts

0

decreased by-100%

No dependency changes