Remove _FXBSTR* and calls to FX_BSTRC.

This CL removes _FXBSTR and changes FPDF_AbbrPair to hold
two FX_CHAR pointers. The two remaining uses of FX_BSTRC()
were in unused FDE_CSS defines which have been removed.

BUG=pdfium:151

Review URL: https://codereview.chromium.org/1847333004

3 files changed, 69 insertions, 41 deletions

diff --git a/core/fpdfapi/fpdf_page/fpdf_page_parser.cpp b/core/fpdfapi/fpdf_page/fpdf_page_parser.cpp
index bf691f41d2..daddb9f05b 100644
--- a/core/fpdfapi/fpdf_page/fpdf_page_parser.cpp
+++ b/core/fpdfapi/fpdf_page/fpdf_page_parser.cpp
@@ -41,42 +41,24 @@ const char kPathOperatorCubicBezier3 = 'y';
 const char kPathOperatorClosePath = 'h';
 const char kPathOperatorRectangle[] = "re";
 
-struct _FX_BSTR {
-  const FX_CHAR* m_Ptr;
-  int m_Size;
+struct PDF_AbbrPair {
+  const FX_CHAR* abbr;
+  const FX_CHAR* full_name;
 };
-#define _FX_BSTRC(str) \
-  { str, sizeof(str) - 1 }
 
-struct PDF_AbbrPairs {
-  _FX_BSTR full_name;
-  _FX_BSTR abbr;
+const PDF_AbbrPair PDF_InlineKeyAbbr[] = {
+    {"BPC", "BitsPerComponent"}, {"CS", "ColorSpace"}, {"D", "Decode"},
+    {"DP", "DecodeParms"},       {"F", "Filter"},      {"H", "Height"},
+    {"IM", "ImageMask"},         {"I", "Interpolate"}, {"W", "Width"},
 };
 
-const PDF_AbbrPairs PDF_InlineKeyAbbr[] = {
-    {_FX_BSTRC("BitsPerComponent"), _FX_BSTRC("BPC")},
-    {_FX_BSTRC("ColorSpace"), _FX_BSTRC("CS")},
-    {_FX_BSTRC("Decode"), _FX_BSTRC("D")},
-    {_FX_BSTRC("DecodeParms"), _FX_BSTRC("DP")},
-    {_FX_BSTRC("Filter"), _FX_BSTRC("F")},
-    {_FX_BSTRC("Height"), _FX_BSTRC("H")},
-    {_FX_BSTRC("ImageMask"), _FX_BSTRC("IM")},
-    {_FX_BSTRC("Interpolate"), _FX_BSTRC("I")},
-    {_FX_BSTRC("Width"), _FX_BSTRC("W")},
-};
-
-const PDF_AbbrPairs PDF_InlineValueAbbr[] = {
-    {_FX_BSTRC("DeviceGray"), _FX_BSTRC("G")},
-    {_FX_BSTRC("DeviceRGB"), _FX_BSTRC("RGB")},
-    {_FX_BSTRC("DeviceCMYK"), _FX_BSTRC("CMYK")},
-    {_FX_BSTRC("Indexed"), _FX_BSTRC("I")},
-    {_FX_BSTRC("ASCIIHexDecode"), _FX_BSTRC("AHx")},
-    {_FX_BSTRC("ASCII85Decode"), _FX_BSTRC("A85")},
-    {_FX_BSTRC("LZWDecode"), _FX_BSTRC("LZW")},
-    {_FX_BSTRC("FlateDecode"), _FX_BSTRC("Fl")},
-    {_FX_BSTRC("RunLengthDecode"), _FX_BSTRC("RL")},
-    {_FX_BSTRC("CCITTFaxDecode"), _FX_BSTRC("CCF")},
-    {_FX_BSTRC("DCTDecode"), _FX_BSTRC("DCT")},
+const PDF_AbbrPair PDF_InlineValueAbbr[] = {
+    {"G", "DeviceGray"},       {"RGB", "DeviceRGB"},
+    {"CMYK", "DeviceCMYK"},    {"I", "Indexed"},
+    {"AHx", "ASCIIHexDecode"}, {"A85", "ASCII85Decode"},
+    {"LZW", "LZWDecode"},      {"Fl", "FlateDecode"},
+    {"RL", "RunLengthDecode"}, {"CCF", "CCITTFaxDecode"},
+    {"DCT", "DCTDecode"},
 };
 
 struct AbbrReplacementOp {
@@ -98,21 +80,29 @@ class CPDF_StreamParserAutoClearer {
   CPDF_StreamParser** scoped_variable_;
 };
 
-CFX_ByteStringC PDF_FindFullName(const PDF_AbbrPairs* table,
+CFX_ByteStringC PDF_FindFullName(const PDF_AbbrPair* table,
                                  size_t count,
                                  const CFX_ByteStringC& abbr) {
-  for (size_t i = 0; i < count; ++i) {
-    if (abbr.GetLength() != table[i].abbr.m_Size)
-      continue;
-    if (memcmp(abbr.GetPtr(), table[i].abbr.m_Ptr, abbr.GetLength()))
-      continue;
-    return CFX_ByteStringC(table[i].full_name.m_Ptr, table[i].full_name.m_Size);
-  }
-  return CFX_ByteStringC();
+  auto it = std::find_if(
+      table, table + count,
+      [abbr](const PDF_AbbrPair& pair) { return pair.abbr == abbr; });
+  return it != table + count ? CFX_ByteStringC(it->full_name)
+                             : CFX_ByteStringC();
 }
 
 }  // namespace
 
+CFX_ByteStringC PDF_FindKeyAbbreviationForTesting(const CFX_ByteStringC& abbr) {
+  return PDF_FindFullName(PDF_InlineKeyAbbr, FX_ArraySize(PDF_InlineKeyAbbr),
+                          abbr);
+}
+
+CFX_ByteStringC PDF_FindValueAbbreviationForTesting(
+    const CFX_ByteStringC& abbr) {
+  return PDF_FindFullName(PDF_InlineValueAbbr,
+                          FX_ArraySize(PDF_InlineValueAbbr), abbr);
+}
+
 bool IsPathOperator(const uint8_t* buf, size_t len) {
   if (len == 1) {
     uint8_t op = buf[0];
diff --git a/core/fpdfapi/fpdf_page/fpdf_page_parser_unittest.cpp b/core/fpdfapi/fpdf_page/fpdf_page_parser_unittest.cpp
new file mode 100644
index 0000000000..3da36a8f8c
--- /dev/null
+++ b/core/fpdfapi/fpdf_page/fpdf_page_parser_unittest.cpp
@@ -0,0 +1,34 @@
+// Copyright 2016 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 "core/fpdfapi/fpdf_page/pageint.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+TEST(fpdf_page_parser, PDF_FindKeyAbbreviation) {
+  EXPECT_EQ(CFX_ByteStringC("BitsPerComponent"),
+            PDF_FindKeyAbbreviationForTesting(CFX_ByteStringC("BPC")));
+  EXPECT_EQ(CFX_ByteStringC("Width"),
+            PDF_FindKeyAbbreviationForTesting(CFX_ByteStringC("W")));
+  EXPECT_EQ(CFX_ByteStringC(""),
+            PDF_FindKeyAbbreviationForTesting(CFX_ByteStringC("")));
+  EXPECT_EQ(CFX_ByteStringC(""),
+            PDF_FindKeyAbbreviationForTesting(CFX_ByteStringC("NoInList")));
+  // Prefix should not match.
+  EXPECT_EQ(CFX_ByteStringC(""),
+            PDF_FindKeyAbbreviationForTesting(CFX_ByteStringC("WW")));
+}
+
+TEST(fpdf_page_parser, PDF_FindValueAbbreviation) {
+  EXPECT_EQ(CFX_ByteStringC("DeviceGray"),
+            PDF_FindValueAbbreviationForTesting(CFX_ByteStringC("G")));
+  EXPECT_EQ(CFX_ByteStringC("DCTDecode"),
+            PDF_FindValueAbbreviationForTesting(CFX_ByteStringC("DCT")));
+  EXPECT_EQ(CFX_ByteStringC(""),
+            PDF_FindValueAbbreviationForTesting(CFX_ByteStringC("")));
+  EXPECT_EQ(CFX_ByteStringC(""),
+            PDF_FindValueAbbreviationForTesting(CFX_ByteStringC("NoInList")));
+  // Prefix should not match.
+  EXPECT_EQ(CFX_ByteStringC(""),
+            PDF_FindValueAbbreviationForTesting(CFX_ByteStringC("II")));
+}
diff --git a/core/fpdfapi/fpdf_page/pageint.h b/core/fpdfapi/fpdf_page/pageint.h
index 4fa62c03cb..0909125ab0 100644
--- a/core/fpdfapi/fpdf_page/pageint.h
+++ b/core/fpdfapi/fpdf_page/pageint.h
@@ -505,6 +505,10 @@ struct PatternValue {
   FX_FLOAT m_Comps[MAX_PATTERN_COLORCOMPS];
 };
 
+CFX_ByteStringC PDF_FindKeyAbbreviationForTesting(const CFX_ByteStringC& abbr);
+CFX_ByteStringC PDF_FindValueAbbreviationForTesting(
+    const CFX_ByteStringC& abbr);
+
 void PDF_ReplaceAbbr(CPDF_Object* pObj);
 bool IsPathOperator(const uint8_t* buf, size_t len);