SkPDF: Fix encoding of unichr outside of basic plane

src/pdf/SkPDFDevice.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPDFDevice.h"
 
 #include "SkAnnotationKeys.h"
@@ skipping 1045 matching lines @@
 //                   significant and should be encoded and not
 //                   discarded.  If true, the upper byte is encoded
 //                   first.  Otherwise, we assert the upper byte is
 //                   zero.
 static void write_wide_string(SkDynamicMemoryWStream* wStream,
                               const uint16_t* input,
                               size_t len,
                               bool wideChars) {
     if (wideChars) {
         SkASSERT(2 * len < 65535);
-        static const char gHex[] = "0123456789ABCDEF";
         wStream->writeText("<");
         for (size_t i = 0; i < len; i++) {
-            char result[4];  // Big-endian
-            result[0] = gHex[(input[i] >> 12) & 0xF];
-            result[1] = gHex[(input[i] >> 8) & 0xF];
-            result[2] = gHex[(input[i] >> 4) & 0xF];
-            result[3] = gHex[(input[i]) & 0xF];
-            wStream->write(result, 4);
+            SkPDFUtils::WriteUInt16BE(wStream, input[i]);
         }
         wStream->writeText(">");
     } else {
         SkASSERT(len <= 65535);
         SkAutoMalloc buffer(len);  // Remove every other byte.
         uint8_t* ptr = (uint8_t*)buffer.get();
         for (size_t i = 0; i < len; i++) {
             SkASSERT(0 == input[i] >> 8);
             ptr[i] = static_cast<uint8_t>(input[i]);
         }
@@ skipping 1043 matching lines @@
         if (!pdfimage) {
             return;
         }
         fDocument->serialize(pdfimage);  // serialize images early.
         fDocument->canon()->addPDFBitmap(key, pdfimage);
     }
     // TODO(halcanary): addXObjectResource() should take a sk_sp<SkPDFObject>
     SkPDFUtils::DrawFormXObject(this->addXObjectResource(pdfimage.get()),
                                 &content.entry()->fContent);
 }