Consolidate test support code.

testing/test_support.cpp

Index: testing/test_support.cpp
diff --git a/testing/test_support.cpp b/testing/test_support.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..611ba5d580641df8c5a64c31c273ab83e630a0a9
--- /dev/null
+++ b/testing/test_support.cpp
@@ -0,0 +1,140 @@
+// 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.
+
+#include "test_support.h"
+
+#include <stdio.h>
+#include <string.h>
+
+#ifdef _WIN32
+#define PATH_SEPARATOR '\\'
+#else
+#define PATH_SEPARATOR '/'
+#endif
+
+namespace {
+
+#ifdef PDF_ENABLE_V8
+#ifdef V8_USE_EXTERNAL_STARTUP_DATA
+// Returns the full path for an external V8 data file based on either
+// the currect exectuable path or an explicit override.
+std::string GetFullPathForSnapshotFile(const std::string& exe_path,
+                                       const std::string& bin_dir,
+                                       const std::string& filename) {
+  std::string result;
+  if (!bin_dir.empty()) {
+    result = bin_dir;
+    if (*bin_dir.rbegin() != PATH_SEPARATOR) {
+      result += PATH_SEPARATOR;
+    }
+  } else if (!exe_path.empty()) {
+    size_t last_separator = exe_path.rfind(PATH_SEPARATOR);
+    if (last_separator != std::string::npos) {
+      result = exe_path.substr(0, last_separator + 1);
+    }
+  }
+  result += filename;
+  return result;
+}
+
+bool GetExternalData(const std::string& exe_path,
+                     const std::string& bin_dir,
+                     const std::string& filename,
+                     v8::StartupData* result_data) {
+  std::string full_path =
+      GetFullPathForSnapshotFile(exe_path, bin_dir, filename);
+  size_t data_length = 0;
+  char* data_buffer = GetFileContents(full_path.c_str(), &data_length);
+  if (!data_buffer) {
+    return false;
+  }
+  result_data->data = const_cast<const char*>(data_buffer);
+  result_data->raw_size = data_length;
+  return true;
+}
+#endif  // V8_USE_EXTERNAL_STARTUP_DATA
+
+void InitializeV8Common(v8::Platform** platform) {
+  v8::V8::InitializeICU();
+
+  *platform = v8::platform::CreateDefaultPlatform();
+  v8::V8::InitializePlatform(*platform);
+  v8::V8::Initialize();
+
+  // By enabling predictable mode, V8 won't post any background tasks.
+  const char predictable_flag[] = "--predictable";
+  v8::V8::SetFlagsFromString(predictable_flag,
+                             static_cast<int>(strlen(predictable_flag)));
+}
+#endif  // PDF_ENABLE_V8
+
+}  // namespace
+
+char* GetFileContents(const char* filename, size_t* retlen) {
+  FILE* file = fopen(filename, "rb");
+  if (!file) {
+    fprintf(stderr, "Failed to open: %s\n", filename);
+    return nullptr;
+  }
+  (void)fseek(file, 0, SEEK_END);
+  size_t file_length = ftell(file);
+  if (!file_length) {
+    return nullptr;
+  }
+  (void)fseek(file, 0, SEEK_SET);
+  char* buffer = (char*)malloc(file_length);
+  if (!buffer) {
+    return nullptr;
+  }
+  size_t bytes_read = fread(buffer, 1, file_length, file);
+  (void)fclose(file);
+  if (bytes_read != file_length) {
+    fprintf(stderr, "Failed to read: %s\n", filename);
+    free(buffer);
+    return nullptr;
+  }
+  *retlen = bytes_read;
+  return buffer;
+}
+
+#ifdef PDF_ENABLE_V8
+#ifdef V8_USE_EXTERNAL_STARTUP_DATA
+bool InitializeV8ForPDFium(const std::string& exe_path,
+                           const std::string& bin_dir,
+                           v8::StartupData* natives_blob,
+                           v8::StartupData* snapshot_blob,
+                           v8::Platform** platform) {
+  InitializeV8Common(platform);
+  if (!GetExternalData(exe_path, bin_dir, "natives_blob.bin", natives_blob))
+    return false;
+  if (!GetExternalData(exe_path, bin_dir, "snapshot_blob.bin", snapshot_blob))
+    return false;
+  v8::V8::SetNativesDataBlob(natives_blob);
+  v8::V8::SetSnapshotDataBlob(snapshot_blob);
+  return true;
+}
+#else   // V8_USE_EXTERNAL_STARTUP_DATA
+bool InitializeV8ForPDFium(v8::Platform** platform) {
+  InitializeV8Common(platform);
+  return true;
+}
+#endif  // V8_USE_EXTERNAL_STARTUP_DATA
+#endif  // PDF_ENABLE_V8
+
+TestLoader::TestLoader(const char* pBuf, size_t len)
+    : m_pBuf(pBuf), m_Len(len) {
+}
+
+// static
+int TestLoader::GetBlock(void* param,
+                         unsigned long pos,
+                         unsigned char* pBuf,
+                         unsigned long size) {
+  TestLoader* pLoader = static_cast<TestLoader*>(param);
+  if (pos + size < pos || pos + size > pLoader->m_Len)
+    return 0;
+
+  memcpy(pBuf, pLoader->m_pBuf + pos, size);
+  return 1;
+}