1 files changed, 162 insertions, 0 deletions
diff --git a/core/fpdfapi/fpdf_font/cpdf_type3font.cpp b/core/fpdfapi/fpdf_font/cpdf_type3font.cpp
new file mode 100644
index 0000000000..91a03a9830
--- /dev/null
+++ b/core/fpdfapi/fpdf_font/cpdf_type3font.cpp
@@ -0,0 +1,162 @@
+// 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.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#include "core/fpdfapi/fpdf_font/cpdf_type3font.h"
+
+#include "core/fpdfapi/fpdf_font/cpdf_type3char.h"
+#include "core/fpdfapi/fpdf_page/include/cpdf_form.h"
+#include "core/fpdfapi/fpdf_page/pageint.h"
+#include "core/fpdfapi/fpdf_parser/include/cpdf_array.h"
+#include "core/fpdfapi/fpdf_parser/include/cpdf_dictionary.h"
+#include "core/fxcrt/include/fx_system.h"
+#include "third_party/base/stl_util.h"
+
+CPDF_Type3Font::CPDF_Type3Font()
+    : m_pCharProcs(nullptr),
+      m_pPageResources(nullptr),
+      m_pFontResources(nullptr) {
+  FXSYS_memset(m_CharWidthL, 0, sizeof(m_CharWidthL));
+}
+
+CPDF_Type3Font::~CPDF_Type3Font() {
+  for (auto it : m_CacheMap)
+    delete it.second;
+}
+
+bool CPDF_Type3Font::IsType3Font() const {
+  return true;
+}
+
+const CPDF_Type3Font* CPDF_Type3Font::AsType3Font() const {
+  return this;
+}
+
+CPDF_Type3Font* CPDF_Type3Font::AsType3Font() {
+  return this;
+}
+
+FX_BOOL CPDF_Type3Font::Load() {
+  m_pFontResources = m_pFontDict->GetDictBy("Resources");
+  CPDF_Array* pMatrix = m_pFontDict->GetArrayBy("FontMatrix");
+  FX_FLOAT xscale = 1.0f, yscale = 1.0f;
+  if (pMatrix) {
+    m_FontMatrix = pMatrix->GetMatrix();
+    xscale = m_FontMatrix.a;
+    yscale = m_FontMatrix.d;
+  }
+  CPDF_Array* pBBox = m_pFontDict->GetArrayBy("FontBBox");
+  if (pBBox) {
+    m_FontBBox.left = (int32_t)(pBBox->GetNumberAt(0) * xscale * 1000);
+    m_FontBBox.bottom = (int32_t)(pBBox->GetNumberAt(1) * yscale * 1000);
+    m_FontBBox.right = (int32_t)(pBBox->GetNumberAt(2) * xscale * 1000);
+    m_FontBBox.top = (int32_t)(pBBox->GetNumberAt(3) * yscale * 1000);
+  }
+  int StartChar = m_pFontDict->GetIntegerBy("FirstChar");
+  CPDF_Array* pWidthArray = m_pFontDict->GetArrayBy("Widths");
+  if (pWidthArray && (StartChar >= 0 && StartChar < 256)) {
+    FX_DWORD count = pWidthArray->GetCount();
+    if (count > 256) {
+      count = 256;
+    }
+    if (StartChar + count > 256) {
+      count = 256 - StartChar;
+    }
+    for (FX_DWORD i = 0; i < count; i++) {
+      m_CharWidthL[StartChar + i] =
+          FXSYS_round(pWidthArray->GetNumberAt(i) * xscale * 1000);
+    }
+  }
+  m_pCharProcs = m_pFontDict->GetDictBy("CharProcs");
+  CPDF_Object* pEncoding = m_pFontDict->GetElementValue("Encoding");
+  if (pEncoding) {
+    LoadPDFEncoding(pEncoding, m_BaseEncoding, m_pCharNames, FALSE, FALSE);
+    if (m_pCharNames) {
+      for (int i = 0; i < 256; i++) {
+        m_Encoding.m_Unicodes[i] = PDF_UnicodeFromAdobeName(m_pCharNames[i]);
+        if (m_Encoding.m_Unicodes[i] == 0) {
+          m_Encoding.m_Unicodes[i] = i;
+        }
+      }
+    }
+  }
+  return TRUE;
+}
+
+void CPDF_Type3Font::CheckType3FontMetrics() {
+  CheckFontMetrics();
+}
+
+CPDF_Type3Char* CPDF_Type3Font::LoadChar(FX_DWORD charcode, int level) {
+  if (level >= _FPDF_MAX_TYPE3_FORM_LEVEL_)
+    return nullptr;
+
+  auto it = m_CacheMap.find(charcode);
+  if (it != m_CacheMap.end())
+    return it->second;
+
+  const FX_CHAR* name =
+      GetAdobeCharName(m_BaseEncoding, m_pCharNames, charcode);
+  if (!name)
+    return nullptr;
+
+  CPDF_Stream* pStream =
+      ToStream(m_pCharProcs ? m_pCharProcs->GetElementValue(name) : nullptr);
+  if (!pStream)
+    return nullptr;
+
+  std::unique_ptr<CPDF_Type3Char> pNewChar(new CPDF_Type3Char(new CPDF_Form(
+      m_pDocument, m_pFontResources ? m_pFontResources : m_pPageResources,
+      pStream, nullptr)));
+
+  // This can trigger recursion into this method. The content of |m_CacheMap|
+  // can change as a result. Thus after it returns, check the cache again for
+  // a cache hit.
+  pNewChar->m_pForm->ParseContent(nullptr, nullptr, pNewChar.get(), nullptr,
+                                  level + 1);
+  it = m_CacheMap.find(charcode);
+  if (it != m_CacheMap.end())
+    return it->second;
+
+  FX_FLOAT scale = m_FontMatrix.GetXUnit();
+  pNewChar->m_Width = (int32_t)(pNewChar->m_Width * scale + 0.5f);
+  FX_RECT& rcBBox = pNewChar->m_BBox;
+  CFX_FloatRect char_rect(
+      (FX_FLOAT)rcBBox.left / 1000.0f, (FX_FLOAT)rcBBox.bottom / 1000.0f,
+      (FX_FLOAT)rcBBox.right / 1000.0f, (FX_FLOAT)rcBBox.top / 1000.0f);
+  if (rcBBox.right <= rcBBox.left || rcBBox.bottom >= rcBBox.top)
+    char_rect = pNewChar->m_pForm->CalcBoundingBox();
+
+  char_rect.Transform(&m_FontMatrix);
+  rcBBox.left = FXSYS_round(char_rect.left * 1000);
+  rcBBox.right = FXSYS_round(char_rect.right * 1000);
+  rcBBox.top = FXSYS_round(char_rect.top * 1000);
+  rcBBox.bottom = FXSYS_round(char_rect.bottom * 1000);
+
+  ASSERT(!pdfium::ContainsKey(m_CacheMap, charcode));
+  CPDF_Type3Char* pCachedChar = pNewChar.release();
+  m_CacheMap[charcode] = pCachedChar;
+  if (pCachedChar->m_pForm->GetPageObjectList()->empty()) {
+    delete pCachedChar->m_pForm;
+    pCachedChar->m_pForm = nullptr;
+  }
+  return pCachedChar;
+}
+
+int CPDF_Type3Font::GetCharWidthF(FX_DWORD charcode, int level) {
+  if (charcode >= FX_ArraySize(m_CharWidthL))
+    charcode = 0;
+
+  if (m_CharWidthL[charcode])
+    return m_CharWidthL[charcode];
+
+  const CPDF_Type3Char* pChar = LoadChar(charcode, level);
+  return pChar ? pChar->m_Width : 0;
+}
+
+FX_RECT CPDF_Type3Font::GetCharBBox(FX_DWORD charcode, int level) {
+  const CPDF_Type3Char* pChar = LoadChar(charcode, level);
+  return pChar ? pChar->m_BBox : FX_RECT();
+}