Checks the possibility of overscans from EDID extension data.

ui/base/x/x11_util_unittest.cc

Index: ui/base/x/x11_util_unittest.cc
diff --git a/ui/base/x/x11_util_unittest.cc b/ui/base/x/x11_util_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..802b9e932effcbecb88cc2a4b360fc4a1c28c5b3
--- /dev/null
+++ b/ui/base/x/x11_util_unittest.cc
@@ -0,0 +1,168 @@
+// Copyright (c) 2012 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 "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/base/x/x11_util.h"
+
+namespace ui {
+
+namespace {
+
+// Sample EDID data extracted from real devices.
+const unsigned char kNormalDisplay[] =
+    "\x00\xff\xff\xff\xff\xff\xff\x00\x22\xf0\x6c\x28\x01\x01\x01\x01"
+    "\x02\x16\x01\x04\xb5\x40\x28\x78\xe2\x8d\x85\xad\x4f\x35\xb1\x25"
+    "\x0e\x50\x54\x00\x00\x00\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01"
+    "\x01\x01\x01\x01\x01\x01\xe2\x68\x00\xa0\xa0\x40\x2e\x60\x30\x20"
+    "\x36\x00\x81\x90\x21\x00\x00\x1a\xbc\x1b\x00\xa0\x50\x20\x17\x30"
+    "\x30\x20\x36\x00\x81\x90\x21\x00\x00\x1a\x00\x00\x00\xfc\x00\x48"
+    "\x50\x20\x5a\x52\x33\x30\x77\x0a\x20\x20\x20\x20\x00\x00\x00\xff"
+    "\x00\x43\x4e\x34\x32\x30\x32\x31\x33\x37\x51\x0a\x20\x20\x00\x71";
+
+const unsigned char kInternalDisplay[] =
+    "\x00\xff\xff\xff\xff\xff\xff\x00\x4c\xa3\x42\x31\x00\x00\x00\x00"
+    "\x00\x15\x01\x03\x80\x1a\x10\x78\x0a\xd3\xe5\x95\x5c\x60\x90\x27"
+    "\x19\x50\x54\x00\x00\x00\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01"
+    "\x01\x01\x01\x01\x01\x01\x9e\x1b\x00\xa0\x50\x20\x12\x30\x10\x30"
+    "\x13\x00\x05\xa3\x10\x00\x00\x19\x00\x00\x00\x0f\x00\x00\x00\x00"
+    "\x00\x00\x00\x00\x00\x23\x87\x02\x64\x00\x00\x00\x00\xfe\x00\x53"
+    "\x41\x4d\x53\x55\x4e\x47\x0a\x20\x20\x20\x20\x20\x00\x00\x00\xfe"
+    "\x00\x31\x32\x31\x41\x54\x31\x31\x2d\x38\x30\x31\x0a\x20\x00\x45";
+
+const unsigned char kOverscanDisplay[] =
+    "\x00\xff\xff\xff\xff\xff\xff\x00\x4c\x2d\xfe\x08\x00\x00\x00\x00"
+    "\x29\x15\x01\x03\x80\x10\x09\x78\x0a\xee\x91\xa3\x54\x4c\x99\x26"
+    "\x0f\x50\x54\xbd\xef\x80\x71\x4f\x81\xc0\x81\x00\x81\x80\x95\x00"
+    "\xa9\xc0\xb3\x00\x01\x01\x02\x3a\x80\x18\x71\x38\x2d\x40\x58\x2c"
+    "\x45\x00\xa0\x5a\x00\x00\x00\x1e\x66\x21\x56\xaa\x51\x00\x1e\x30"
+    "\x46\x8f\x33\x00\xa0\x5a\x00\x00\x00\x1e\x00\x00\x00\xfd\x00\x18"
+    "\x4b\x0f\x51\x17\x00\x0a\x20\x20\x20\x20\x20\x20\x00\x00\x00\xfc"
+    "\x00\x53\x41\x4d\x53\x55\x4e\x47\x0a\x20\x20\x20\x20\x20\x01\x1d"
+    "\x02\x03\x1f\xf1\x47\x90\x04\x05\x03\x20\x22\x07\x23\x09\x07\x07"
+    "\x83\x01\x00\x00\xe2\x00\x0f\x67\x03\x0c\x00\x20\x00\xb8\x2d\x01"
+    "\x1d\x80\x18\x71\x1c\x16\x20\x58\x2c\x25\x00\xa0\x5a\x00\x00\x00"
+    "\x9e\x01\x1d\x00\x72\x51\xd0\x1e\x20\x6e\x28\x55\x00\xa0\x5a\x00"
+    "\x00\x00\x1e\x8c\x0a\xd0\x8a\x20\xe0\x2d\x10\x10\x3e\x96\x00\xa0"
+    "\x5a\x00\x00\x00\x18\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
+    "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
+    "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xc6";
+
+}
+
+TEST(X11UtilTest, ParseEDID) {
+  uint16 manufacturer_id = 0;
+  uint32 serial_number = 0;
+  std::string human_readable_name;
+  EXPECT_TRUE(ParseOutputDeviceData(
+      kNormalDisplay, arraysize(kNormalDisplay),
+      &manufacturer_id, &serial_number, &human_readable_name));
+  EXPECT_EQ(0x22f0u, manufacturer_id);
+  EXPECT_EQ(0x01010101u, serial_number);
+  EXPECT_EQ("HP ZR30w", human_readable_name);
+
+  manufacturer_id = 0;
+  serial_number = 0;
+  human_readable_name.clear();
+  EXPECT_TRUE(ParseOutputDeviceData(
+      kInternalDisplay, arraysize(kInternalDisplay),
+      &manufacturer_id, &serial_number, NULL));
+  EXPECT_EQ(0x4ca3u, manufacturer_id);
+  EXPECT_EQ(0x00000000u, serial_number);
+  EXPECT_EQ("", human_readable_name);
+
+  // Internal display doesn't have name.
+  EXPECT_FALSE(ParseOutputDeviceData(
+      kInternalDisplay, arraysize(kInternalDisplay),
+      NULL, NULL, &human_readable_name));
+
+  manufacturer_id = 0;
+  serial_number = 0;
+  human_readable_name.clear();
+  EXPECT_TRUE(ParseOutputDeviceData(
+      kOverscanDisplay, arraysize(kOverscanDisplay),
+      &manufacturer_id, &serial_number, &human_readable_name));
+  EXPECT_EQ(0x4c2du, manufacturer_id);
+  EXPECT_EQ(0x00000000u, serial_number);
+  EXPECT_EQ("SAMSUNG", human_readable_name);
+}
+
+TEST(X11UtilTest, ParseBrokenEDID) {
+  uint16 manufacturer_id = 0;
+  uint32 serial_number = 0;
+  std::string human_readable_name;
+
+  // length == 0
+  EXPECT_FALSE(ParseOutputDeviceData(
+      kNormalDisplay, 0,
+      &manufacturer_id, &serial_number, &human_readable_name));
+
+  // name is broken. Copying kNormalDisplay and substitute its name data by
+  // some control code.
+  std::string display_data(
+      reinterpret_cast<const char*>(kNormalDisplay), arraysize(kNormalDisplay));
+
+  // display's name data is embedded in byte 95-107 in this specific example.
+  // Fix here too when the contents of kNormalDisplay is altered.
+  display_data[97] = '\x1b';
+  EXPECT_FALSE(ParseOutputDeviceData(
+      reinterpret_cast<const unsigned char*>(display_data.data()),
+      display_data.size(),
+      &manufacturer_id, &serial_number, &human_readable_name));
+
+  // If |human_readable_name| isn't specified, it skips parsing the name.
+  manufacturer_id = 0;
+  serial_number = 0;
+  EXPECT_TRUE(ParseOutputDeviceData(
+      reinterpret_cast<const unsigned char*>(display_data.data()),
+      display_data.size(),
+      &manufacturer_id, &serial_number, NULL));
+  EXPECT_EQ(0x22f0u, manufacturer_id);
+  EXPECT_EQ(0x01010101u, serial_number);
+}
+
+TEST(X11UtilTest, ParseOverscanFlag) {
+  bool flag = false;
+  EXPECT_FALSE(ParseOutputOverscanFlag(
+      kNormalDisplay, arraysize(kNormalDisplay), &flag));
+
+  flag = false;
+  EXPECT_FALSE(ParseOutputOverscanFlag(
+      kInternalDisplay, arraysize(kInternalDisplay), &flag));
+
+  flag = false;
+  EXPECT_TRUE(ParseOutputOverscanFlag(
+      kOverscanDisplay, arraysize(kOverscanDisplay), &flag));
+  EXPECT_TRUE(flag);
+
+  flag = false;
+  // Copy |kOverscanDisplay| and set flags to false in it. The overscan flags
+  // are embedded at byte 150 in this specific example. Fix here too when the
+  // contents of kOverscanDisplay is altered.
+  std::string display_data(reinterpret_cast<const char*>(kOverscanDisplay),
+                           arraysize(kOverscanDisplay));
+  display_data[150] = '\0';
+  EXPECT_TRUE(ParseOutputOverscanFlag(
+      reinterpret_cast<const unsigned char*>(display_data.data()),
+      display_data.size(), &flag));
+  EXPECT_FALSE(flag);
+}
+
+TEST(X11UtilTest, ParseBrokenOverscanData) {
+  // Do not fill valid data here because it anyway fails to parse the data.
+  scoped_array<unsigned char> data(new unsigned char[126]);
+  bool flag = false;
+  EXPECT_FALSE(ParseOutputOverscanFlag(data.get(), 0, &flag));
+  EXPECT_FALSE(ParseOutputOverscanFlag(data.get(), 126, &flag));
+
+  // extending data because ParseOutputOverscanFlag() will access the data.
+  data.reset(new unsigned char[150]);
+  // The number of CEA extensions is stored at byte 126.
+  data[126] = '\x01';
+  EXPECT_FALSE(ParseOutputOverscanFlag(data.get(), 128, &flag));
+  EXPECT_FALSE(ParseOutputOverscanFlag(data.get(), 150, &flag));
+}
+
+}