Simple PMP reader to parse Picasa's metadata

webkit/fileapi/media/picasa/pmp_column_reader_unittest.cc

Index: webkit/fileapi/media/picasa/pmp_column_reader_unittest.cc
diff --git a/webkit/fileapi/media/picasa/pmp_column_reader_unittest.cc b/webkit/fileapi/media/picasa/pmp_column_reader_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..9cebb00c662d75df2cd7d136c6fd7194e66e6cfb
--- /dev/null
+++ b/webkit/fileapi/media/picasa/pmp_column_reader_unittest.cc
@@ -0,0 +1,175 @@
+// Copyright 2013 The Chromium 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 <algorithm>
+#include <vector>
+
+#include "base/file_util.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "webkit/fileapi/media/picasa/pmp_column_reader.h"
+#include "webkit/fileapi/media/picasa/pmp_constants.h"
+#include "webkit/fileapi/media/picasa/pmp_test_helper.h"
+
+namespace {
+
+using fileapi::PmpColumnReader;
+using fileapi::PmpTestHelper;
+
+// Writes memory into a temporary file for use in test
+bool ReaderReadFromVector(PmpColumnReader* const reader,

[vandebo (ex-Chrome), 2013/03/29 21:35:07]

InitColumnReaderFromMemory ?

[tommycli, 2013/04/01 22:19:18]

Done.

+                          std::vector<uint8> data, uint32* rows_read) {
+  base::FilePath temppath;
+
+  if(!file_util::CreateTemporaryFile(&temppath) ||
+     !PmpTestHelper::WriteToFile(temppath, data)) {
+    return false;
+  }
+
+  bool success = reader->InitFromFile(temppath, rows_read);
+
+  file_util::Delete(temppath, true);
+
+  return success;
+}
+
+// Overridden version of Read method to make test code templatable.
+bool DoRead(const PmpColumnReader* reader, uint32 row, std::string* target) {
+  return reader->ReadString(row, target);
+}
+
+bool DoRead(const PmpColumnReader* reader, uint32 row, uint32* target) {
+  return reader->ReadUInt32(row, target);
+}
+
+bool DoRead(const PmpColumnReader* reader, uint32 row, double* target) {
+  return reader->ReadDouble64(row, target);
+}
+
+bool DoRead(const PmpColumnReader* reader, uint32 row, uint8* target) {
+  return reader->ReadUInt8(row, target);
+}
+
+bool DoRead(const PmpColumnReader* reader, uint32 row, uint64* target) {
+  return reader->ReadUInt64(row, target);
+}
+
+// TestValid
+template<class T>
+void TestValid(PmpColumnReader* reader, const uint16 field_type,
+               const std::vector<T>& elems) {
+  uint32 rows_read = 0xFF;
+
+  std::vector<uint8> data =
+      PmpTestHelper::MakeHeaderAndBody(field_type, elems.size(), elems);
+  EXPECT_TRUE(ReaderReadFromVector(reader, data, &rows_read));
+  EXPECT_EQ(elems.size(), rows_read);
+
+  for(uint32 i = 0; i < elems.size(); i++) {

[vandebo (ex-Chrome), 2013/03/29 21:35:07]

i < elems.size() && i < rows_read. You've already expected that they're equal. 
If they aren't, there's no point trying to read beyond the end.

[tommycli, 2013/04/01 22:19:18]

Done.

+    T target;
+    EXPECT_TRUE(DoRead(reader, i, &target));
+    EXPECT_EQ(elems[i], target);
+  }
+}
+
+template<class T>
+void TestMalformed(PmpColumnReader* reader, const uint16 field_type,
+                   const std::vector<T>& elems) {
+
+  std::vector<uint8> data_too_few_declared_rows =
+      PmpTestHelper::MakeHeaderAndBody(field_type, elems.size()-1, elems);
+  EXPECT_FALSE(ReaderReadFromVector(reader, data_too_few_declared_rows, NULL));
+
+  std::vector<uint8> data_too_many_declared_rows =
+      PmpTestHelper::MakeHeaderAndBody(field_type, elems.size()+1, elems);
+  EXPECT_FALSE(ReaderReadFromVector(reader, data_too_many_declared_rows, NULL));
+
+  std::vector<uint8> data_truncated =
+      PmpTestHelper::MakeHeaderAndBody(field_type, elems.size(), elems);
+  data_truncated.resize(data_truncated.size()-10);
+
+  EXPECT_FALSE(ReaderReadFromVector(reader, data_truncated, NULL));
+
+  std::vector<uint8> data_padded =
+      PmpTestHelper::MakeHeaderAndBody(field_type, elems.size(), elems);
+  data_padded.resize(data_padded.size()+10);
+  EXPECT_FALSE(ReaderReadFromVector(reader, data_padded, NULL));
+}
+
+template<class T>
+void TestPrimitives(const uint16 field_type) {
+  PmpColumnReader reader;
+
+  // Make an ascending vector of the primitive.
+  uint32 n = 100;
+  std::vector<T> data(n, 0);
+  for(uint32 i = 0; i < n; i++) {
+    data[i] = i*3;
+  }
+
+  TestValid<T>(&reader, field_type, data);
+  TestMalformed<T>(&reader, field_type, data);
+}
+
+
+TEST(PmpColumnReaderTest, HeaderParsingAndValidation) {
+  PmpColumnReader reader;
+
+  // Good header.
+  uint32 rows_read = 0xFF;
+  std::vector<uint8> good_header = PmpTestHelper::MakeHeader(0x00, 0);
+  EXPECT_TRUE(ReaderReadFromVector(&reader, good_header, &rows_read));
+  EXPECT_EQ(0U, rows_read) << "Read non-zero rows from header-only data.";
+
+  // Botch up elements of the header.
+  std::vector<uint8> bad_magic_byte = PmpTestHelper::MakeHeader(0x00, 0);
+  bad_magic_byte[0] = 0xff;
+  EXPECT_FALSE(ReaderReadFromVector(&reader, bad_magic_byte, NULL));
+
+  // Corrupt means the type fields don't agree.
+  std::vector<uint8> corrupt_type = PmpTestHelper::MakeHeader(0x00, 0);
+  corrupt_type[fileapi::kPmpFieldType1Offset] = 0xff;
+  EXPECT_FALSE(ReaderReadFromVector(&reader, corrupt_type, NULL));
+
+  std::vector<uint8> invalid_type = PmpTestHelper::MakeHeader(0x00, 0);
+  invalid_type[fileapi::kPmpFieldType1Offset] = 0xff;
+  invalid_type[fileapi::kPmpFieldType2Offset] = 0xff;
+  EXPECT_FALSE(ReaderReadFromVector(&reader, invalid_type, NULL));
+
+  std::vector<uint8> incomplete_header = PmpTestHelper::MakeHeader(0x00, 0);
+  incomplete_header.resize(10);
+  EXPECT_FALSE(ReaderReadFromVector(&reader, incomplete_header, NULL));
+}
+
+TEST(PmpColumnReaderTest, StringParsing) {
+  PmpColumnReader reader;
+
+  std::vector<std::string> empty_strings(100, "");
+
+  // Test empty strings read okay.
+  TestValid(&reader, fileapi::kPmpFieldTypeString, empty_strings);
+
+  std::vector<std::string> mixed_strings;
+  mixed_strings.push_back("");
+  mixed_strings.push_back("Hello");
+  mixed_strings.push_back("World");
+  mixed_strings.push_back("");
+  mixed_strings.push_back("123123");
+  mixed_strings.push_back("Q");
+  mixed_strings.push_back("");
+
+  // Test that a mixed set of strings read correctly.
+  TestValid(&reader, fileapi::kPmpFieldTypeString, mixed_strings);
+
+  // Test with the data messed up in a variety of ways.
+  TestMalformed(&reader, fileapi::kPmpFieldTypeString, mixed_strings);
+}
+
+TEST(PmpColumnReaderTest, PrimitiveParsing) {
+  TestPrimitives<uint32>(fileapi::kPmpFieldTypeUInt32);
+  TestPrimitives<double>(fileapi::kPmpFieldTypeDouble64);
+  TestPrimitives<uint8>(fileapi::kPmpFieldTypeUInt8);
+  TestPrimitives<uint64>(fileapi::kPmpFieldTypeUInt64);
+}
+
+}  // namespace