Expose IPTC and XMP metadata when available (#1079)

lib/input.js

@@ -182,6 +182,8 @@ function clone () {
  * - `orientation`: Number value of the EXIF Orientation header, if present
  * - `exif`: Buffer containing raw EXIF data, if present
  * - `icc`: Buffer containing raw [ICC](https://www.npmjs.com/package/icc) profile data, if present
+ * - `iptc`: Buffer containing raw IPTC data, if present
+ * - `xmp`: Buffer containing raw XMP data, if present
  *
  * @example
  * const image = sharp(inputJpg);

package.json

@@ -41,7 +41,8 @@
     "Matt Parrish <matt.r.parrish@gmail.com>",
     "Matthew McEachen <matthew+github@mceachen.org>",
     "Jarda Kotěšovec <jarda.kotesovec@gmail.com>",
-    "Kenric D'Souza <kenric.dsouza@gmail.com>"
+    "Kenric D'Souza <kenric.dsouza@gmail.com>",
+    "Oleh Aleinyk <oleg.aleynik@gmail.com>"
   ],
   "scripts": {
     "clean": "rm -rf node_modules/ build/ vendor/ coverage/ test/fixtures/output.*",

src/metadata.cc

@@ -81,6 +81,22 @@ class MetadataWorker : public Nan::AsyncWorker {
         memcpy(baton->icc, icc, iccLength);
         baton->iccLength = iccLength;
       }
+      // IPTC
+      if (image.get_typeof(VIPS_META_IPCT_NAME) == VIPS_TYPE_BLOB) {
+        size_t iptcLength;
+        void const *iptc = image.get_blob(VIPS_META_IPCT_NAME, &iptcLength);
+        baton->iptc = static_cast<char *>(g_malloc(iptcLength));
+        memcpy(baton->iptc, iptc, iptcLength);
+        baton->iptcLength = iptcLength;
+      }
+      // XMP
+      if (image.get_typeof(VIPS_META_XMP_NAME) == VIPS_TYPE_BLOB) {
+        size_t xmpLength;
+        void const *xmp = image.get_blob(VIPS_META_XMP_NAME, &xmpLength);
+        baton->xmp = static_cast<char *>(g_malloc(xmpLength));
+        memcpy(baton->xmp, xmp, xmpLength);
+        baton->xmpLength = xmpLength;
+      }
     }
 
     // Clean up
@@ -123,6 +139,16 @@ class MetadataWorker : public Nan::AsyncWorker {
           New("icc").ToLocalChecked(),
           Nan::NewBuffer(baton->icc, baton->iccLength, sharp::FreeCallback, nullptr).ToLocalChecked());
       }
+      if (baton->iptcLength > 0) {
+        Set(info,
+          New("iptc").ToLocalChecked(),
+          Nan::NewBuffer(baton->iptc, baton->iptcLength, sharp::FreeCallback, nullptr).ToLocalChecked());
+      }
+      if (baton->xmpLength > 0) {
+        Set(info,
+          New("xmp").ToLocalChecked(),
+          Nan::NewBuffer(baton->xmp, baton->xmpLength, sharp::FreeCallback, nullptr).ToLocalChecked());
+      }
       argv[1] = info;
     }
 

src/metadata.h

@@ -38,6 +38,10 @@ struct MetadataBaton {
   size_t exifLength;
   char *icc;
   size_t iccLength;
+  char *iptc;
+  size_t iptcLength;
+  char *xmp;
+  size_t xmpLength;
   std::string err;
 
   MetadataBaton():
@@ -52,7 +56,11 @@ struct MetadataBaton {
     exif(nullptr),
     exifLength(0),
     icc(nullptr),
-    iccLength(0) {}
+    iccLength(0),
+    iptc(nullptr),
+    iptcLength(0),
+    xmp(nullptr),
+    xmpLength(0) {}
 };
 
 NAN_METHOD(metadata);

test/fixtures/index.js

@@ -57,6 +57,7 @@ module.exports = {
 
   inputJpg: getPath('2569067123_aca715a2ee_o.jpg'), // http://www.flickr.com/photos/grizdave/2569067123/
   inputJpgWithExif: getPath('Landscape_8.jpg'), // https://github.com/recurser/exif-orientation-examples/blob/master/Landscape_8.jpg
+  inputJpgWithIptcAndXmp: getPath('Landscape_9.jpg'), // https://unsplash.com/photos/RWAIyGmgHTQ
   inputJpgWithExifMirroring: getPath('Landscape_5.jpg'), // https://github.com/recurser/exif-orientation-examples/blob/master/Landscape_5.jpg
   inputJpgWithGammaHoliness: getPath('gamma_dalai_lama_gray.jpg'), // http://www.4p8.com/eric.brasseur/gamma.html
   inputJpgWithCmykProfile: getPath('Channel_digital_image_CMYK_color.jpg'), // http://en.wikipedia.org/wiki/File:Channel_digital_image_CMYK_color.jpg

test/unit/metadata.js

@@ -58,6 +58,23 @@ describe('Image metadata', function () {
     });
   });
 
+  it('JPEG with IPTC/XMP', function (done) {
+    sharp(fixtures.inputJpgWithIptcAndXmp).metadata(function (err, metadata) {
+      if (err) throw err;
+      // IPTC
+      assert.strictEqual('object', typeof metadata.iptc);
+      assert.strictEqual(true, metadata.iptc instanceof Buffer);
+      assert.strictEqual(18250, metadata.iptc.byteLength);
+      assert.strictEqual(metadata.iptc.indexOf(Buffer.from('Photoshop')), 0);
+      // XMP
+      assert.strictEqual('object', typeof metadata.xmp);
+      assert.strictEqual(true, metadata.xmp instanceof Buffer);
+      assert.strictEqual(12495, metadata.xmp.byteLength);
+      assert.strictEqual(metadata.xmp.indexOf(Buffer.from('http://ns.adobe.com/xap/1.0')), 0);
+      done();
+    });
+  });
+
   it('TIFF', function (done) {
     sharp(fixtures.inputTiff).metadata(function (err, metadata) {
       if (err) throw err;