Add tests for CMap_GetCode and CMap_GetCodeRange.

core/src/fpdfapi/fpdf_font/fpdf_font_cid_unittest.cpp

+// 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 "testing/gtest/include/gtest/gtest.h"
+
+#include "font_int.h"
+
+namespace {
+
+bool uint_ranges_equal(uint8_t* a, uint8_t* b, size_t count) {
+  for (size_t i = 0; i < count; ++i) {
+    if (a[i] != b[i])
+      return false;
+  }
+  return true;
+}
+
+}  // namespace
+
+TEST(fpdf_font_cid, CMap_GetCode) {
+  EXPECT_EQ(0, CPDF_CMapParser::CMap_GetCode(""));
+  EXPECT_EQ(0, CPDF_CMapParser::CMap_GetCode("<"));
+  EXPECT_EQ(194, CPDF_CMapParser::CMap_GetCode("<c2"));
+  EXPECT_EQ(162, CPDF_CMapParser::CMap_GetCode("<A2"));
+  EXPECT_EQ(2802, CPDF_CMapParser::CMap_GetCode("<Af2"));
+  EXPECT_EQ(162, CPDF_CMapParser::CMap_GetCode("<A2z"));
+
+  EXPECT_EQ(12, CPDF_CMapParser::CMap_GetCode("12"));
+  EXPECT_EQ(12, CPDF_CMapParser::CMap_GetCode("12d"));
+  EXPECT_EQ(128, CPDF_CMapParser::CMap_GetCode("128"));
+}
+
+TEST(fpdf_font_cid, CMap_GetCodeRange) {
+  CMap_CodeRange range;
+
+  // Must start with a <
+  EXPECT_FALSE(CPDF_CMapParser::CMap_GetCodeRange(range, "", ""));
+  EXPECT_FALSE(CPDF_CMapParser::CMap_GetCodeRange(range, "A", ""));
+
+  // m_CharSize must be <= 4
+  EXPECT_FALSE(CPDF_CMapParser::CMap_GetCodeRange(range, "<aaaaaaaaaa>", ""));
+  EXPECT_EQ(5, range.m_CharSize);
+
+  EXPECT_TRUE(
+      CPDF_CMapParser::CMap_GetCodeRange(range, "<12345678>", "<87654321>"));
+  EXPECT_EQ(4, range.m_CharSize);
+  {
+    uint8_t lower[4] = {18, 52, 86, 120};
+    uint8_t upper[4] = {135, 101, 67, 33};
+    EXPECT_TRUE(uint_ranges_equal(lower, range.m_Lower, range.m_CharSize));
+    EXPECT_TRUE(uint_ranges_equal(upper, range.m_Upper, range.m_CharSize));
+  }
+
+  // Hex characters
+  EXPECT_TRUE(CPDF_CMapParser::CMap_GetCodeRange(range, "<a1>", "<F3>"));
+  EXPECT_EQ(1, range.m_CharSize);
+  EXPECT_EQ(161, range.m_Lower[0]);
+  EXPECT_EQ(243, range.m_Upper[0]);
+
+  // The second string should return 0's if it is shorter
+  EXPECT_TRUE(CPDF_CMapParser::CMap_GetCodeRange(range, "<a1>", ""));
+  EXPECT_EQ(1, range.m_CharSize);
+  EXPECT_EQ(161, range.m_Lower[0]);
+  EXPECT_EQ(0, range.m_Upper[0]);
+}