Re-land: Remove FX_Alloc() null checks now that it can't return NULL.

Fixes the ordering of some assignments broken when converting to checked
numerics in CFX_PathData::AddPointCount().

Original Review URL: https://codereview.chromium.org/1142713005

R=thestig@chromium.org

Review URL: https://codereview.chromium.org/1135893008

5 files changed, 22 insertions, 78 deletions

diff --git a/core/src/fxge/ge/fx_ge_font.cpp b/core/src/fxge/ge/fx_ge_font.cpp
index 104a23998d..1896218cbf 100644
--- a/core/src/fxge/ge/fx_ge_font.cpp
+++ b/core/src/fxge/ge/fx_ge_font.cpp
@@ -104,9 +104,6 @@ extern "C" {
 FX_BOOL _LoadFile(FXFT_Library library, FXFT_Face* Face, IFX_FileRead* pFile, FXFT_Stream* stream)
 {
     FXFT_Stream stream1 = (FXFT_Stream)FX_Alloc(FX_BYTE, sizeof (FXFT_StreamRec));
-    if (!stream1) {
-        return FALSE;
-    }
     stream1->base = NULL;
     stream1->size = (unsigned long)pFile->GetSize();
     stream1->pos = 0;
@@ -177,9 +174,6 @@ static FXFT_Face FT_LoadFont(FX_LPBYTE pData, int size)
 FX_BOOL CFX_Font::LoadEmbedded(FX_LPCBYTE data, FX_DWORD size)
 {
     m_pFontDataAllocation = FX_Alloc(FX_BYTE, size);
-    if (!m_pFontDataAllocation) {
-        return FALSE;
-    }
     FXSYS_memcpy32(m_pFontDataAllocation, data, size);
     m_Face = FT_LoadFont((FX_LPBYTE)m_pFontDataAllocation, size);
     m_pFontData = (FX_LPBYTE)m_pFontDataAllocation;
diff --git a/core/src/fxge/ge/fx_ge_fontmap.cpp b/core/src/fxge/ge/fx_ge_fontmap.cpp
index f058f03bce..74f97d1b2e 100644
--- a/core/src/fxge/ge/fx_ge_fontmap.cpp
+++ b/core/src/fxge/ge/fx_ge_fontmap.cpp
@@ -564,9 +564,6 @@ CFX_ByteString CFX_FontMapper::GetPSNameFromTT(void* hFont)
     FX_DWORD size = m_pFontInfo->GetFontData(hFont, 0x6e616d65, NULL, 0);
     if (size) {
         FX_LPBYTE buffer = FX_Alloc(FX_BYTE, size);
-        if (!buffer) {
-            return result;
-        }
         m_pFontInfo->GetFontData(hFont, 0x6e616d65, buffer, size);
         result = _FPDF_GetNameFromTT(buffer, 6);
         FX_Free(buffer);
@@ -1209,21 +1206,15 @@ FXFT_Face CFX_FontMapper::FindSubstFont(const CFX_ByteString& name, FX_BOOL bTru
         face = m_pFontMgr->GetCachedTTCFace(ttc_size, checksum, ttc_size - font_size, pFontData);
         if (face == NULL) {
             pFontData = FX_Alloc(FX_BYTE, ttc_size);
-            if (pFontData) {
-                m_pFontInfo->GetFontData(hFont, 0x74746366, pFontData, ttc_size);
-                face = m_pFontMgr->AddCachedTTCFace(ttc_size, checksum, pFontData, ttc_size,
-                                                    ttc_size - font_size);
-            }
+            m_pFontInfo->GetFontData(hFont, 0x74746366, pFontData, ttc_size);
+            face = m_pFontMgr->AddCachedTTCFace(ttc_size, checksum, pFontData, ttc_size,
+                                                ttc_size - font_size);
         }
     } else {
         FX_LPBYTE pFontData;
         face = m_pFontMgr->GetCachedFace(SubstName, weight, bItalic, pFontData);
         if (face == NULL) {
             pFontData = FX_Alloc(FX_BYTE, font_size);
-            if (!pFontData) {
-                m_pFontInfo->DeleteFont(hFont);
-                return NULL;
-            }
             m_pFontInfo->GetFontData(hFont, 0, pFontData, font_size);
             face = m_pFontMgr->AddCachedFace(SubstName, weight, bItalic, pFontData, font_size, m_pFontInfo->GetFaceIndex(hFont));
         }
@@ -1380,10 +1371,6 @@ void CFX_FolderFontInfo::ScanFile(CFX_ByteString& path)
         }
         FX_DWORD face_bytes = nFaces * 4;
         FX_LPBYTE offsets = FX_Alloc(FX_BYTE, face_bytes);
-        if (!offsets) {
-            FXSYS_fclose(pFile);
-            return;
-        }
         readCnt = FXSYS_fread(offsets, face_bytes, 1, pFile);
         if (readCnt != face_bytes) {
             FX_Free(offsets);
diff --git a/core/src/fxge/ge/fx_ge_path.cpp b/core/src/fxge/ge/fx_ge_path.cpp
index b96a2f1163..51d5908a81 100644
--- a/core/src/fxge/ge/fx_ge_path.cpp
+++ b/core/src/fxge/ge/fx_ge_path.cpp
@@ -4,8 +4,10 @@
  
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
+#include "../../../../third_party/base/numerics/safe_math.h"
 #include "../../../include/fxcrt/fx_basic.h"
 #include "../../../include/fxge/fx_ge.h"
+
 CFX_ClipRgn::CFX_ClipRgn(int width, int height)
 {
     m_Type = RectI;
@@ -120,7 +122,7 @@ CFX_PathData::~CFX_PathData()
         FX_Free(m_pPoints);
     }
 }
-FX_BOOL CFX_PathData::SetPointCount(int nPoints)
+void CFX_PathData::SetPointCount(int nPoints)
 {
     m_PointCount = nPoints;
     if (m_AllocCount < nPoints) {
@@ -129,20 +131,13 @@ FX_BOOL CFX_PathData::SetPointCount(int nPoints)
             m_pPoints = NULL;
         }
         m_pPoints = FX_Alloc(FX_PATHPOINT, nPoints);
-        if (!m_pPoints) {
-            return FALSE;
-        }
         m_AllocCount = nPoints;
     }
-    return TRUE;
 }
-FX_BOOL CFX_PathData::AllocPointCount(int nPoints)
+void CFX_PathData::AllocPointCount(int nPoints)
 {
     if (m_AllocCount < nPoints) {
         FX_PATHPOINT* pNewBuf = FX_Alloc(FX_PATHPOINT, nPoints);
-        if (!pNewBuf) {
-            return FALSE;
-        }
         if (m_PointCount) {
             FXSYS_memcpy32(pNewBuf, m_pPoints, m_PointCount * sizeof(FX_PATHPOINT));
         }
@@ -152,16 +147,11 @@ FX_BOOL CFX_PathData::AllocPointCount(int nPoints)
         m_pPoints = pNewBuf;
         m_AllocCount = nPoints;
     }
-    return TRUE;
 }
 CFX_PathData::CFX_PathData(const CFX_PathData& src)
 {
-    m_pPoints = NULL;
     m_PointCount = m_AllocCount = src.m_PointCount;
     m_pPoints = FX_Alloc(FX_PATHPOINT, src.m_PointCount);
-    if (!m_pPoints) {
-        return;
-    }
     FXSYS_memcpy32(m_pPoints, src.m_pPoints, sizeof(FX_PATHPOINT) * m_PointCount);
 }
 void CFX_PathData::TrimPoints(int nPoints)
@@ -171,29 +161,24 @@ void CFX_PathData::TrimPoints(int nPoints)
     }
     SetPointCount(nPoints);
 }
-FX_BOOL CFX_PathData::AddPointCount(int addPoints)
+void CFX_PathData::AddPointCount(int addPoints)
 {
-    int new_count = m_PointCount + addPoints;
-    if (!AllocPointCount(new_count)) {
-        return FALSE;
-    }
+    pdfium::base::CheckedNumeric<int> safe_new_count = m_PointCount;
+    safe_new_count += addPoints;
+    int new_count = safe_new_count.ValueOrDie();
+    AllocPointCount(new_count);
     m_PointCount = new_count;
-    return TRUE;
 }
-FX_BOOL CFX_PathData::Append(const CFX_PathData* pSrc, const CFX_AffineMatrix* pMatrix)
+void CFX_PathData::Append(const CFX_PathData* pSrc, const CFX_AffineMatrix* pMatrix)
 {
     int old_count = m_PointCount;
-    if (!AddPointCount(pSrc->m_PointCount)) {
-        return FALSE;
-    }
+    AddPointCount(pSrc->m_PointCount);
     FXSYS_memcpy32(m_pPoints + old_count, pSrc->m_pPoints, pSrc->m_PointCount * sizeof(FX_PATHPOINT));
-    if (pMatrix == NULL) {
-        return TRUE;
-    }
-    for (int i = 0; i < pSrc->m_PointCount; i ++) {
-        pMatrix->Transform(m_pPoints[old_count + i].m_PointX, m_pPoints[old_count + i].m_PointY);
+    if (pMatrix) {
+        for (int i = 0; i < pSrc->m_PointCount; i ++) {
+            pMatrix->Transform(m_pPoints[old_count + i].m_PointX, m_pPoints[old_count + i].m_PointY);
+        }
     }
-    return TRUE;
 }
 void CFX_PathData::SetPoint(int index, FX_FLOAT x, FX_FLOAT y, int flag)
 {
@@ -202,12 +187,10 @@ void CFX_PathData::SetPoint(int index, FX_FLOAT x, FX_FLOAT y, int flag)
     m_pPoints[index].m_PointY = y;
     m_pPoints[index].m_Flag = flag;
 }
-FX_BOOL CFX_PathData::AppendRect(FX_FLOAT left, FX_FLOAT bottom, FX_FLOAT right, FX_FLOAT top)
+void CFX_PathData::AppendRect(FX_FLOAT left, FX_FLOAT bottom, FX_FLOAT right, FX_FLOAT top)
 {
     int old_count = m_PointCount;
-    if (!AddPointCount(5)) {
-        return FALSE;
-    }
+    AddPointCount(5);
     FX_PATHPOINT* pPoints = m_pPoints + old_count;
     pPoints[0].m_PointX = pPoints[1].m_PointX = pPoints[4].m_PointX = left;
     pPoints[2].m_PointX = pPoints[3].m_PointX = right;
@@ -216,7 +199,6 @@ FX_BOOL CFX_PathData::AppendRect(FX_FLOAT left, FX_FLOAT bottom, FX_FLOAT right,
     pPoints[0].m_Flag = FXPT_MOVETO;
     pPoints[1].m_Flag = pPoints[2].m_Flag = pPoints[3].m_Flag = FXPT_LINETO;
     pPoints[4].m_Flag = FXPT_LINETO | FXPT_CLOSEFIGURE;
-    return TRUE;
 }
 CFX_FloatRect CFX_PathData::GetBoundingBox() const
 {
@@ -590,13 +572,10 @@ FX_BOOL CFX_PathData::IsRect(const CFX_AffineMatrix* pMatrix, CFX_FloatRect* pRe
     }
     return TRUE;
 }
-FX_BOOL CFX_PathData::Copy(const CFX_PathData &src)
+void CFX_PathData::Copy(const CFX_PathData &src)
 {
-    if (!SetPointCount(src.m_PointCount)) {
-        return FALSE;
-    }
+    SetPointCount(src.m_PointCount);
     FXSYS_memcpy32(m_pPoints, src.m_pPoints, sizeof(FX_PATHPOINT) * m_PointCount);
-    return TRUE;
 }
 CFX_GraphStateData::CFX_GraphStateData()
 {
@@ -627,9 +606,6 @@ void CFX_GraphStateData::Copy(const CFX_GraphStateData& src)
     m_LineWidth = src.m_LineWidth;
     if (m_DashCount) {
         m_DashArray = FX_Alloc(FX_FLOAT, m_DashCount);
-        if (!m_DashArray) {
-            return;
-        }
         FXSYS_memcpy32(m_DashArray, src.m_DashArray, m_DashCount * sizeof(FX_FLOAT));
     }
 }
diff --git a/core/src/fxge/ge/fx_ge_ps.cpp b/core/src/fxge/ge/fx_ge_ps.cpp
index ad572115c5..e81b6bf362 100644
--- a/core/src/fxge/ge/fx_ge_ps.cpp
+++ b/core/src/fxge/ge/fx_ge_ps.cpp
@@ -349,9 +349,6 @@ FX_BOOL CFX_PSRenderer::DrawDIBits(const CFX_DIBSource* pSource, FX_DWORD color,
         int pitch = (width + 7) / 8;
         FX_DWORD src_size = height * pitch;
         FX_LPBYTE src_buf = FX_Alloc(FX_BYTE, src_size);
-        if (!src_buf) {
-            return FALSE;
-        }
         for (int row = 0; row < height; row ++) {
             FX_LPCBYTE src_scan = pSource->GetScanline(row);
             FXSYS_memcpy32(src_buf + row * pitch, src_scan, pitch);
@@ -425,13 +422,6 @@ FX_BOOL CFX_PSRenderer::DrawDIBits(const CFX_DIBSource* pSource, FX_DWORD color,
             int src_pitch = width * Bpp;
             output_size = height * src_pitch;
             output_buf = FX_Alloc(FX_BYTE, output_size);
-            if (!output_buf) {
-                if (pConverted != pSource) {
-                    delete pConverted;
-                    pConverted = NULL;
-                }
-                return FALSE;
-            }
             for (int row = 0; row < height; row ++) {
                 FX_LPCBYTE src_scan = pConverted->GetScanline(row);
                 FX_LPBYTE dest_scan = output_buf + row * src_pitch;
diff --git a/core/src/fxge/ge/fx_ge_text.cpp b/core/src/fxge/ge/fx_ge_text.cpp
index 21eebb7630..f6d2fa510f 100644
--- a/core/src/fxge/ge/fx_ge_text.cpp
+++ b/core/src/fxge/ge/fx_ge_text.cpp
@@ -203,9 +203,6 @@ FX_BOOL CFX_RenderDevice::DrawNormalText(int nChars, const FXTEXT_CHARPOS* pChar
     CFX_FaceCache* pFaceCache = pCache->GetCachedFace(pFont);
     FX_FONTCACHE_DEFINE(pCache, pFont);
     FXTEXT_GLYPHPOS* pGlyphAndPos = FX_Alloc(FXTEXT_GLYPHPOS, nChars);
-    if (!pGlyphAndPos) {
-        return FALSE;
-    }
     int iChar;
     deviceCtm = char2device;
     CFX_AffineMatrix matrixCTM = GetCTM();