SkPDF/Deflate: clean up old SkFlate code

src/core/SkStream.cpp

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "SkStream.h"
@@ skipping 932 matching lines @@
     SkDynamicMemoryWStream tempStream;
     const size_t bufferSize = 4096;
     char buffer[bufferSize];
     do {
         size_t bytesRead = stream->read(buffer, bufferSize);
         tempStream.write(buffer, bytesRead);
     } while (!stream->isAtEnd());
     return tempStream.detachAsStream();  // returns a SkBlockMemoryStream,
                                          // cheaper than copying to SkData
 }
+
+bool SkStreamCopy(SkWStream* out, SkStream* input) {
+    const char* base = static_cast<const char*>(input->getMemoryBase());
+    if (base && input->hasPosition() && input->hasLength()) {
+        // Shortcut that avoids the while loop.
+        size_t position = input->getPosition();
+        size_t length = input->getLength();
+        SkASSERT(length >= position);
+        return out->write(&base[position], length - position);
+    }
+    char scratch[4096];
+    size_t count;
+    while (true) {
+        count = input->read(scratch, sizeof(scratch));
+        if (0 == count) {
+            return true;
+        }
+        if (!out->write(scratch, count)) {
+            return false;
+        }
+    }
+}