Move CPDF_Font::LoadPDFEncoding() to CPDF_SimpleFont.

It is not used in the CPDF_Font base class.

Change-Id: I6033a5dd422179eb95f19a2f2ecf06d007f3223f
Reviewed-on: https://pdfium-review.googlesource.com/39493
Reviewed-by: Nicolás Peña Moreno <npm@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>

1 files changed, 83 insertions, 0 deletions

diff --git a/core/fpdfapi/font/cpdf_simplefont.cpp b/core/fpdfapi/font/cpdf_simplefont.cpp
index e646c14ba8..76f1c7cbd1 100644
--- a/core/fpdfapi/font/cpdf_simplefont.cpp
+++ b/core/fpdfapi/font/cpdf_simplefont.cpp
@@ -8,9 +8,25 @@
 
 #include "core/fpdfapi/parser/cpdf_array.h"
 #include "core/fpdfapi/parser/cpdf_dictionary.h"
+#include "core/fpdfapi/parser/cpdf_name.h"
 #include "core/fxge/fx_freetype.h"
 #include "third_party/base/numerics/safe_math.h"
 
+namespace {
+
+void GetPredefinedEncoding(const ByteString& value, int* basemap) {
+  if (value == "WinAnsiEncoding")
+    *basemap = PDFFONT_ENCODING_WINANSI;
+  else if (value == "MacRomanEncoding")
+    *basemap = PDFFONT_ENCODING_MACROMAN;
+  else if (value == "MacExpertEncoding")
+    *basemap = PDFFONT_ENCODING_MACEXPERT;
+  else if (value == "PDFDocEncoding")
+    *basemap = PDFFONT_ENCODING_PDFDOC;
+}
+
+}  // namespace
+
 CPDF_SimpleFont::CPDF_SimpleFont(CPDF_Document* pDocument,
                                  CPDF_Dictionary* pFontDict)
     : CPDF_Font(pDocument, pFontDict) {
@@ -82,6 +98,73 @@ void CPDF_SimpleFont::LoadCharMetrics(int charcode) {
   }
 }
 
+void CPDF_SimpleFont::LoadPDFEncoding(CPDF_Object* pEncoding,
+                                      int& iBaseEncoding,
+                                      std::vector<ByteString>* pCharNames,
+                                      bool bEmbedded,
+                                      bool bTrueType) {
+  if (!pEncoding) {
+    if (m_BaseFont == "Symbol") {
+      iBaseEncoding = bTrueType ? PDFFONT_ENCODING_MS_SYMBOL
+                                : PDFFONT_ENCODING_ADOBE_SYMBOL;
+    } else if (!bEmbedded && iBaseEncoding == PDFFONT_ENCODING_BUILTIN) {
+      iBaseEncoding = PDFFONT_ENCODING_WINANSI;
+    }
+    return;
+  }
+  if (pEncoding->IsName()) {
+    if (iBaseEncoding == PDFFONT_ENCODING_ADOBE_SYMBOL ||
+        iBaseEncoding == PDFFONT_ENCODING_ZAPFDINGBATS) {
+      return;
+    }
+    if (FontStyleIsSymbolic(m_Flags) && m_BaseFont == "Symbol") {
+      if (!bTrueType)
+        iBaseEncoding = PDFFONT_ENCODING_ADOBE_SYMBOL;
+      return;
+    }
+    ByteString bsEncoding = pEncoding->GetString();
+    if (bsEncoding.Compare("MacExpertEncoding") == 0) {
+      bsEncoding = "WinAnsiEncoding";
+    }
+    GetPredefinedEncoding(bsEncoding, &iBaseEncoding);
+    return;
+  }
+
+  CPDF_Dictionary* pDict = pEncoding->AsDictionary();
+  if (!pDict)
+    return;
+
+  if (iBaseEncoding != PDFFONT_ENCODING_ADOBE_SYMBOL &&
+      iBaseEncoding != PDFFONT_ENCODING_ZAPFDINGBATS) {
+    ByteString bsEncoding = pDict->GetStringFor("BaseEncoding");
+    if (bTrueType && bsEncoding.Compare("MacExpertEncoding") == 0)
+      bsEncoding = "WinAnsiEncoding";
+    GetPredefinedEncoding(bsEncoding, &iBaseEncoding);
+  }
+  if ((!bEmbedded || bTrueType) && iBaseEncoding == PDFFONT_ENCODING_BUILTIN)
+    iBaseEncoding = PDFFONT_ENCODING_STANDARD;
+
+  CPDF_Array* pDiffs = pDict->GetArrayFor("Differences");
+  if (!pDiffs)
+    return;
+
+  pCharNames->resize(256);
+  uint32_t cur_code = 0;
+  for (uint32_t i = 0; i < pDiffs->GetCount(); i++) {
+    CPDF_Object* pElement = pDiffs->GetDirectObjectAt(i);
+    if (!pElement)
+      continue;
+
+    if (CPDF_Name* pName = pElement->AsName()) {
+      if (cur_code < 256)
+        (*pCharNames)[cur_code] = pName->GetString();
+      cur_code++;
+    } else {
+      cur_code = pElement->GetInteger();
+    }
+  }
+}
+
 uint32_t CPDF_SimpleFont::GetCharWidthF(uint32_t charcode) {
   if (charcode > 0xff)
     charcode = 0;