Re-land else-after-returns

Revert "Revert "Fix else-after-returns throughout pdfium.""
This reverts commit 4eb4d7f6c707cc2c23c806aa540d055c8832b55d.

Fix one naming conflict.

TBR=thestig@chromium.org

Review URL: https://codereview.chromium.org/1243953004 .

5 files changed, 111 insertions, 143 deletions

diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp
index 9736c3dc8e..47c08fb4a3 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp
@@ -311,9 +311,8 @@ FX_BOOL PDF_DataDecode(const uint8_t* src_buf, FX_DWORD src_size, const CPDF_Dic
                 dest_size = last_size;
                 pImageParms = pParam;
                 return TRUE;
-            } else {
-                offset = FPDFAPI_FlateOrLZWDecode(FALSE, last_buf, last_size, pParam, estimated_size, new_buf, new_size);
             }
+            offset = FPDFAPI_FlateOrLZWDecode(FALSE, last_buf, last_size, pParam, estimated_size, new_buf, new_size);
         } else if (decoder == FX_BSTRC("LZWDecode") || decoder == FX_BSTRC("LZW")) {
             offset = FPDFAPI_FlateOrLZWDecode(TRUE, last_buf, last_size, pParam, estimated_size, new_buf, new_size);
         } else if (decoder == FX_BSTRC("ASCII85Decode") || decoder == FX_BSTRC("A85")) {
diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_fdf.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_fdf.cpp
index 0471250fd9..f630ea52da 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_fdf.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_fdf.cpp
@@ -181,10 +181,9 @@ CFX_WideString	FPDF_FileSpec_GetWin32Path(const CPDF_Object* pFileSpec)
         result += ':';
         result += ChangeSlash(wsFileName.c_str() + 2);
         return result;
-    } else {
-        CFX_WideString result;
-        result += '\\';
-        result += ChangeSlash(wsFileName.c_str());
-        return result;
     }
+    CFX_WideString result;
+    result += '\\';
+    result += ChangeSlash(wsFileName.c_str());
+    return result;
 }
diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp
index a3e409df57..c7d1dece25 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp
@@ -160,8 +160,8 @@ CPDF_Array* CPDF_Object::GetArray() const
 {
     if (m_Type == PDFOBJ_ARRAY)
         return (CPDF_Array*)this;
-    else
-        return NULL;
+
+    return NULL;
 }
 void CPDF_Object::SetString(const CFX_ByteString& str)
 {
@@ -201,7 +201,8 @@ FX_BOOL CPDF_Object::IsIdentical(CPDF_Object* pOther) const
     if (pOther->m_Type != m_Type) {
         if (m_Type == PDFOBJ_REFERENCE && GetDirect()) {
             return GetDirect()->IsIdentical(pOther);
-        } else if (pOther->m_Type == PDFOBJ_REFERENCE) {
+        }
+        if (pOther->m_Type == PDFOBJ_REFERENCE) {
             return IsIdentical(pOther->GetDirect());
         }
         return FALSE;
@@ -285,27 +286,22 @@ CPDF_Object* CPDF_Object::CloneInternal(FX_BOOL bDirect, CFX_MapPtrToPtr* visite
                 CPDF_StreamAcc acc;
                 acc.LoadAllData(pThis, TRUE);
                 FX_DWORD streamSize = acc.GetSize();
-                CPDF_Stream* pObj;
-                if (pThis->GetDict())
-                    pObj = new CPDF_Stream(acc.DetachData(), streamSize, (CPDF_Dictionary*)((CPDF_Object*)pThis->GetDict())->CloneInternal(bDirect, visited));
-                else
-                    pObj = new CPDF_Stream(acc.DetachData(), streamSize, NULL);
-                return pObj;
+                CPDF_Dictionary* pDict = pThis->GetDict();
+                if (pDict)
+                    pDict = (CPDF_Dictionary*)((CPDF_Object*)pDict)->CloneInternal(bDirect, visited);
+                return new CPDF_Stream(acc.DetachData(), streamSize, pDict);
             }
         case PDFOBJ_REFERENCE: {
                 CPDF_Reference* pRef = (CPDF_Reference*)this;
                 FX_DWORD obj_num = pRef->m_RefObjNum;
                 if (bDirect && !visited->GetValueAt((void*)(uintptr_t)obj_num)) {
                     visited->SetAt((void*)(uintptr_t)obj_num, (void*)1);
-                    CPDF_Object* ret;
-                    if (pRef->GetDirect())
-                        ret = pRef->GetDirect()->CloneInternal(TRUE, visited);
-                    else
-                        ret = NULL;
-                    return ret;
-                } else {
-                    return new CPDF_Reference(pRef->m_pObjList, obj_num);
+                    if (!pRef->GetDirect())
+                        return nullptr;
+
+                    return pRef->GetDirect()->CloneInternal(TRUE, visited);
                 }
+                return new CPDF_Reference(pRef->m_pObjList, obj_num);
             }
     }
     return NULL;
@@ -321,12 +317,14 @@ CFX_WideString CPDF_Object::GetUnicodeText(CFX_CharMap* pCharMap) const
 {
     if (m_Type == PDFOBJ_STRING) {
         return PDF_DecodeText(((CPDF_String*)this)->m_String, pCharMap);
-    } else if (m_Type == PDFOBJ_STREAM) {
+    }
+    if (m_Type == PDFOBJ_STREAM) {
         CPDF_StreamAcc stream;
         stream.LoadAllData((CPDF_Stream*)this, FALSE);
         CFX_WideString result = PDF_DecodeText(stream.GetData(), stream.GetSize(), pCharMap);
         return result;
-    } else if (m_Type == PDFOBJ_NAME) {
+    }
+    if (m_Type == PDFOBJ_NAME) {
         return PDF_DecodeText(((CPDF_Name*)this)->m_Name, pCharMap);
     }
     return CFX_WideString();
@@ -427,8 +425,7 @@ CFX_ByteString CPDF_Array::GetString(FX_DWORD i) const
         CPDF_Object* p = (CPDF_Object*)m_Objects.GetAt(i);
         return p->GetString();
     }
-    else
-        return CFX_ByteString();
+    return CFX_ByteString();
 }
 CFX_ByteStringC CPDF_Array::GetConstString(FX_DWORD i) const
 {
@@ -436,8 +433,7 @@ CFX_ByteStringC CPDF_Array::GetConstString(FX_DWORD i) const
         CPDF_Object* p = (CPDF_Object*)m_Objects.GetAt(i);
         return p->GetConstString();
     }
-    else
-        return CFX_ByteStringC();
+    return CFX_ByteStringC();
 }
 int CPDF_Array::GetInteger(FX_DWORD i) const
 {
@@ -458,11 +454,13 @@ FX_FLOAT CPDF_Array::GetNumber(FX_DWORD i) const
 CPDF_Dictionary* CPDF_Array::GetDict(FX_DWORD i) const
 {
     CPDF_Object* p = GetElementValue(i);
-    if (p == NULL) {
+    if (!p) {
         return NULL;
-    } else if (p->GetType() == PDFOBJ_DICTIONARY) {
+    }
+    if (p->GetType() == PDFOBJ_DICTIONARY) {
         return (CPDF_Dictionary*)p;
-    } else if (p->GetType() == PDFOBJ_STREAM) {
+    }
+    if (p->GetType() == PDFOBJ_STREAM) {
         return ((CPDF_Stream*)p)->GetDict();
     }
     return NULL;
@@ -604,19 +602,19 @@ CFX_ByteString CPDF_Dictionary::GetString(const CFX_ByteStringC& key) const
 {
     CPDF_Object* p = NULL;
     m_Map.Lookup(key, (void*&)p);
-    if (p)
+    if (p) {
         return p->GetString();
-    else
-        return CFX_ByteString();
+    }
+    return CFX_ByteString();
 }
 CFX_ByteStringC CPDF_Dictionary::GetConstString(const CFX_ByteStringC& key) const
 {
     CPDF_Object* p = NULL;
     m_Map.Lookup(key, (void*&)p);
-    if (p)
+    if (p) {
         return p->GetConstString();
-    else
-        return CFX_ByteStringC();
+    }
+    return CFX_ByteStringC();
 }
 CFX_WideString CPDF_Dictionary::GetUnicodeText(const CFX_ByteStringC& key, CFX_CharMap* pCharMap) const
 {
@@ -647,10 +645,10 @@ CFX_ByteStringC CPDF_Dictionary::GetConstString(const CFX_ByteStringC& key, cons
 {
     CPDF_Object* p = NULL;
     m_Map.Lookup(key, (void*&)p);
-    if (p)
+    if (p) {
         return p->GetConstString();
-    else
-        return CFX_ByteStringC(def);
+    }
+    return CFX_ByteStringC(def);
 }
 int CPDF_Dictionary::GetInteger(const CFX_ByteStringC& key) const
 {
@@ -691,14 +689,16 @@ FX_BOOL CPDF_Dictionary::GetBoolean(const CFX_ByteStringC& key, FX_BOOL bDefault
 CPDF_Dictionary* CPDF_Dictionary::GetDict(const CFX_ByteStringC& key) const
 {
     CPDF_Object* p = GetElementValue(key);
-    if (p == NULL) {
-        return NULL;
-    } else if (p->GetType() == PDFOBJ_DICTIONARY) {
+    if (!p) {
+        return nullptr;
+    }
+    if (p->GetType() == PDFOBJ_DICTIONARY) {
         return (CPDF_Dictionary*)p;
-    } else if (p->GetType() == PDFOBJ_STREAM) {
+    }
+    if (p->GetType() == PDFOBJ_STREAM) {
         return ((CPDF_Stream*)p)->GetDict();
     }
-    return NULL;
+    return nullptr;
 }
 CPDF_Array* CPDF_Dictionary::GetArray(const CFX_ByteStringC& key) const
 {
@@ -1269,12 +1269,11 @@ void CPDF_IndirectObjects::InsertIndirectObject(FX_DWORD objnum, CPDF_Object* pO
     }
     void* value = NULL;
     if (m_IndirectObjs.Lookup((void*)(uintptr_t)objnum, value)) {
-        if (value)
-        {
-            if (pObj->GetGenNum() <= ((CPDF_Object*)value)->GetGenNum())
+        if (value) {
+            if (pObj->GetGenNum() <= ((CPDF_Object*)value)->GetGenNum()) {
                 return;
-            else
-                ((CPDF_Object*)value)->Destroy();
+            }
+            ((CPDF_Object*)value)->Destroy();
          }
     }
     pObj->m_ObjNum = objnum;
diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
index f7174f7a72..854be75ad4 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
@@ -1993,21 +1993,16 @@ CFX_ByteString CPDF_SyntaxParser::ReadHexString()
 void CPDF_SyntaxParser::ToNextLine()
 {
     uint8_t ch;
-    while (1) {
-        if (!GetNextChar(ch)) {
-            return;
-        }
+    while (GetNextChar(ch)) {
         if (ch == '\n') {
-            return;
+            break;
         }
         if (ch == '\r') {
             GetNextChar(ch);
-            if (ch == '\n') {
-                return;
-            } else {
-                m_Pos --;
-                return;
+            if (ch != '\n') {
+                --m_Pos;
             }
+            break;
         }
     }
 }
@@ -2079,20 +2074,13 @@ CPDF_Object* CPDF_SyntaxParser::GetObject(CPDF_IndirectObjects* pObjList, FX_DWO
                     return (CPDF_Object*)PDFOBJ_REFERENCE;
                 }
                 return new CPDF_Reference(pObjList, objnum);
-            } else {
-                m_Pos = SavedPos;
-                if (bTypeOnly) {
-                    return (CPDF_Object*)PDFOBJ_NUMBER;
-                }
-                return CPDF_Number::Create(word);
             }
-        } else {
-            m_Pos = SavedPos;
-            if (bTypeOnly) {
-                return (CPDF_Object*)PDFOBJ_NUMBER;
-            }
-            return CPDF_Number::Create(word);
         }
+        m_Pos = SavedPos;
+        if (bTypeOnly) {
+            return (CPDF_Object*)PDFOBJ_NUMBER;
+        }
+        return CPDF_Number::Create(word);
     }
     if (word == FX_BSTRC("true") || word == FX_BSTRC("false")) {
         if (bTypeOnly) {
@@ -2252,25 +2240,18 @@ CPDF_Object* CPDF_SyntaxParser::GetObjectByStrict(CPDF_IndirectObjects* pObjList
         if (bIsNumber) {
             CFX_ByteString nextword2 = GetNextWord(bIsNumber);
             if (nextword2 == FX_BSTRC("R")) {
-                FX_DWORD objnum = FXSYS_atoi(word);
                 if (bTypeOnly) {
                     return (CPDF_Object*)PDFOBJ_REFERENCE;
                 }
+                FX_DWORD objnum = FXSYS_atoi(word);
                 return new CPDF_Reference(pObjList, objnum);
-            } else {
-                m_Pos = SavedPos;
-                if (bTypeOnly) {
-                    return (CPDF_Object*)PDFOBJ_NUMBER;
-                }
-                return CPDF_Number::Create(word);
             }
-        } else {
-            m_Pos = SavedPos;
-            if (bTypeOnly) {
-                return (CPDF_Object*)PDFOBJ_NUMBER;
-            }
-            return CPDF_Number::Create(word);
         }
+        m_Pos = SavedPos;
+        if (bTypeOnly) {
+            return (CPDF_Object*)PDFOBJ_NUMBER;
+        }
+        return CPDF_Number::Create(word);
     }
     if (word == FX_BSTRC("true") || word == FX_BSTRC("false")) {
         if (bTypeOnly) {
@@ -3140,21 +3121,20 @@ FX_BOOL CPDF_DataAvail::CheckAcroFormSubObject(IFX_DownloadHints* pHints)
             m_objs_array.RemoveAll();
         }
         return bRet;
-    } else {
-        CFX_PtrArray new_objs_array;
-        FX_BOOL bRet = IsObjectsAvail(m_objs_array, FALSE, pHints, new_objs_array);
-        if (bRet) {
-            int32_t iSize = m_arrayAcroforms.GetSize();
-            for (int32_t i = 0; i < iSize; ++i) {
-                ((CPDF_Object *)m_arrayAcroforms.GetAt(i))->Release();
-            }
-            m_arrayAcroforms.RemoveAll();
-        } else {
-            m_objs_array.RemoveAll();
-            m_objs_array.Append(new_objs_array);
+    }
+    CFX_PtrArray new_objs_array;
+    FX_BOOL bRet = IsObjectsAvail(m_objs_array, FALSE, pHints, new_objs_array);
+    if (bRet) {
+        int32_t iSize = m_arrayAcroforms.GetSize();
+        for (int32_t i = 0; i < iSize; ++i) {
+            ((CPDF_Object *)m_arrayAcroforms.GetAt(i))->Release();
         }
-        return bRet;
+        m_arrayAcroforms.RemoveAll();
+    } else {
+        m_objs_array.RemoveAll();
+        m_objs_array.Append(new_objs_array);
     }
+    return bRet;
 }
 FX_BOOL CPDF_DataAvail::CheckAcroForm(IFX_DownloadHints* pHints)
 {
@@ -3208,16 +3188,14 @@ FX_BOOL CPDF_DataAvail::CheckDocStatus(IFX_DownloadHints *pHints)
         case PDF_DATAAVAIL_PAGETREE:
             if (m_bTotalLoadPageTree) {
                 return CheckPages(pHints);
-            } else {
-                return LoadDocPages(pHints);
             }
+            return LoadDocPages(pHints);
         case PDF_DATAAVAIL_PAGE:
             if (m_bTotalLoadPageTree) {
                 return CheckPage(pHints);
-            } else {
-                m_docStatus = PDF_DATAAVAIL_PAGE_LATERLOAD;
-                return TRUE;
             }
+            m_docStatus = PDF_DATAAVAIL_PAGE_LATERLOAD;
+            return TRUE;
         case PDF_DATAAVAIL_ERROR:
             return LoadAllFile(pHints);
         case PDF_DATAAVAIL_PAGE_LATERLOAD:
@@ -3761,10 +3739,9 @@ FX_BOOL CPDF_DataAvail::CheckEnd(IFX_DownloadHints* pHints)
             SetStartOffset(m_dwXRefOffset);
             m_docStatus = PDF_DATAAVAIL_CROSSREF;
             return TRUE;
-        } else {
-            m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
-            return TRUE;
         }
+        m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
+        return TRUE;
     }
     pHints->AddSegment(req_pos, dwSize);
     return FALSE;
@@ -3799,9 +3776,6 @@ int32_t CPDF_DataAvail::CheckCrossRefStream(IFX_DownloadHints* pHints, FX_FILESI
                 xref_offset = pObj->GetDict()->GetInteger(FX_BSTRC("Prev"));
                 pObj->Release();
                 return 1;
-            } else {
-                pObj->Release();
-                return -1;
             }
         }
         pObj->Release();
@@ -3955,7 +3929,8 @@ FX_BOOL CPDF_DataAvail::CheckAllCrossRefStream(IFX_DownloadHints *pHints)
             m_Pos = xref_offset;
         }
         return TRUE;
-    } else if (nRet == -1) {
+    }
+    if (nRet == -1) {
         m_docStatus = PDF_DATAAVAIL_ERROR;
     }
     return FALSE;
@@ -4058,11 +4033,10 @@ FX_BOOL CPDF_DataAvail::CheckTrailer(IFX_DownloadHints* pHints)
                 }
             }
             return TRUE;
-        } else {
-            m_dwPrevXRefOffset = 0;
-            m_docStatus = PDF_DATAAVAIL_TRAILER_APPEND;
-            pTrailer->Release();
         }
+        m_dwPrevXRefOffset = 0;
+        m_docStatus = PDF_DATAAVAIL_TRAILER_APPEND;
+        pTrailer->Release();
         return TRUE;
     }
     pHints->AddSegment(m_Pos, iTrailerSize);
@@ -4295,9 +4269,8 @@ FX_BOOL CPDF_DataAvail::LoadDocPages(IFX_DownloadHints* pHints)
     if (CheckPageCount(pHints)) {
         m_docStatus = PDF_DATAAVAIL_PAGE;
         return TRUE;
-    } else {
-        m_bTotalLoadPageTree = TRUE;
     }
+    m_bTotalLoadPageTree = TRUE;
     return FALSE;
 }
 FX_BOOL CPDF_DataAvail::LoadPages(IFX_DownloadHints* pHints)
@@ -4363,15 +4336,14 @@ FX_BOOL CPDF_DataAvail::CheckPageAnnots(int32_t iPage, IFX_DownloadHints* pHints
             m_objs_array.RemoveAll();
         }
         return bRet;
-    } else {
-        CFX_PtrArray new_objs_array;
-        FX_BOOL bRet = IsObjectsAvail(m_objs_array, FALSE, pHints, new_objs_array);
-        m_objs_array.RemoveAll();
-        if (!bRet) {
-            m_objs_array.Append(new_objs_array);
-        }
-        return bRet;
     }
+    CFX_PtrArray new_objs_array;
+    FX_BOOL bRet = IsObjectsAvail(m_objs_array, FALSE, pHints, new_objs_array);
+    m_objs_array.RemoveAll();
+    if (!bRet) {
+        m_objs_array.Append(new_objs_array);
+    }
+    return bRet;
 }
 FX_BOOL CPDF_DataAvail::CheckLinearizedFirstPage(int32_t iPage, IFX_DownloadHints* pHints)
 {
@@ -4381,10 +4353,10 @@ FX_BOOL CPDF_DataAvail::CheckLinearizedFirstPage(int32_t iPage, IFX_DownloadHint
         }
         m_bAnnotsLoad = TRUE;
     }
-    if (m_bAnnotsLoad)
-        if (!CheckLinearizedData(pHints)) {
+    if (m_bAnnotsLoad) {
+        if (!CheckLinearizedData(pHints))
             return FALSE;
-        }
+    }
     m_bPageLoadedOK = FALSE;
     return TRUE;
 }
@@ -4539,15 +4511,14 @@ FX_BOOL CPDF_DataAvail::CheckResources(IFX_DownloadHints* pHints)
             m_objs_array.RemoveAll();
         }
         return bRet;
-    } else {
-        CFX_PtrArray new_objs_array;
-        FX_BOOL bRet = IsObjectsAvail(m_objs_array, FALSE, pHints, new_objs_array);
-        m_objs_array.RemoveAll();
-        if (!bRet) {
-            m_objs_array.Append(new_objs_array);
-        }
-        return bRet;
     }
+    CFX_PtrArray new_objs_array;
+    FX_BOOL bRet = IsObjectsAvail(m_objs_array, FALSE, pHints, new_objs_array);
+    m_objs_array.RemoveAll();
+    if (!bRet) {
+        m_objs_array.Append(new_objs_array);
+    }
+    return bRet;
 }
 void CPDF_DataAvail::GetLinearizedMainXRefInfo(FX_FILESIZE *pPos, FX_DWORD *pSize)
 {
@@ -4604,16 +4575,15 @@ FX_BOOL CPDF_SortObjNumArray::Find(FX_DWORD dwObjNum)
 }
 FX_BOOL CPDF_SortObjNumArray::BinarySearch(FX_DWORD value, int32_t &iNext)
 {
-    int32_t iLen = m_number_array.GetSize();
     int32_t iLow = 0;
-    int32_t iHigh = iLen - 1;
-    int32_t iMid = 0;
+    int32_t iHigh = m_number_array.GetSize() - 1;
     while (iLow <= iHigh) {
-        iMid = (iLow + iHigh) / 2;
+        int32_t iMid = (iLow + iHigh) / 2;
         if (m_number_array.GetAt(iMid) == value) {
             iNext = iMid;
             return TRUE;
-        } else if (m_number_array.GetAt(iMid) > value) {
+        }
+        if (m_number_array.GetAt(iMid) > value) {
             iHigh = iMid - 1;
         } else if (m_number_array.GetAt(iMid) < value) {
             iLow = iMid + 1;
diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_utility.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_utility.cpp
index 6d425de6f8..4903312645 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_utility.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_utility.cpp
@@ -165,7 +165,8 @@ CFX_ByteStringC CPDF_SimpleParser::GetWord()
             m_dwCurPos ++;
         }
         return CFX_ByteStringC(pStart, (FX_STRSIZE)(m_dwCurPos - (pStart - m_pData)));
-    } else if (dwSize == 1 && pStart[0] == '(') {
+    }
+    if (dwSize == 1 && pStart[0] == '(') {
         int level = 1;
         while (m_dwCurPos < m_dwSize) {
             if (m_pData[m_dwCurPos] == ')') {