Add unit tests for ascii85 and hex decoders.

testing/test_support.h

 // Copyright 2015 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef TESTING_EMBEDDER_TEST_SUPPORT_H_
 #define TESTING_EMBEDDER_TEST_SUPPORT_H_
 
 #include <stdlib.h>
 #include <memory>
 #include <string>
 
 #include "public/fpdfview.h"
 #include "public/fpdf_save.h"
 
 #ifdef PDF_ENABLE_V8
 #include "v8/include/v8.h"
 #endif  // PDF_ENABLE_V8
 
 namespace pdfium {
 
+#define STR_TEST_CASE(input_literal, expected_literal)                       \
+  {                                                                          \
+    (const unsigned char*) input_literal, sizeof(input_literal) - 1,         \
+        (const unsigned char*)expected_literal, sizeof(expected_literal) - 1 \
+  }
+
+#define DECODE_TEST_CASE(input_literal, expected_literal, processed_size)     \
+  {                                                                           \
+    (const unsigned char*) input_literal, sizeof(input_literal) - 1,          \
+        (const unsigned char*)expected_literal, sizeof(expected_literal) - 1, \
+        processed_size                                                        \
+  }
+
+struct StrFuncTestData {
+  const unsigned char* input;
+  unsigned int input_size;
+  const unsigned char* expected;
+  unsigned int expected_size;
+};
+
+struct DecodeTestData {
+  const unsigned char* input;
+  unsigned int input_size;
+  const unsigned char* expected;
+  unsigned int expected_size;
+  // The size of input string being processed.
+  unsigned int processed_size;
+};
+
 // Used with std::unique_ptr to free() objects that can't be deleted.
 struct FreeDeleter {
   inline void operator()(void* ptr) const { free(ptr); }
 };
 
 }  // namespace pdfium
 
 // Reads the entire contents of a file into a newly alloc'd buffer.
 std::unique_ptr<char, pdfium::FreeDeleter> GetFileContents(const char* filename,
                                                            size_t* retlen);
@@ skipping 41 matching lines @@
 
  private:
   static int WriteBlockCallback(FPDF_FILEWRITE* pFileWrite,
                                 const void* data,
                                 unsigned long size);
 
   std::string m_String;
 };
 
 #endif  // TESTING_EMBEDDER_TEST_SUPPORT_H_