Use pdfium::span<> in CFX_BitStream, CPDF_SimpleParser.

Get bounds checks in parsers automatically when using spans.

Change-Id: I71fbe7b838435d455376db2f89817d807a9cdcfd
Reviewed-on: https://pdfium-review.googlesource.com/29830
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>

4 files changed, 8 insertions, 6 deletions

diff --git a/core/fpdfapi/page/cpdf_meshstream.cpp b/core/fpdfapi/page/cpdf_meshstream.cpp
index 083acce68a..579678af41 100644
--- a/core/fpdfapi/page/cpdf_meshstream.cpp
+++ b/core/fpdfapi/page/cpdf_meshstream.cpp
@@ -9,6 +9,7 @@
 #include "core/fpdfapi/page/cpdf_colorspace.h"
 #include "core/fpdfapi/page/cpdf_function.h"
 #include "core/fpdfapi/parser/cpdf_array.h"
+#include "third_party/base/span.h"
 
 namespace {
 
@@ -117,8 +118,8 @@ CPDF_MeshStream::~CPDF_MeshStream() {}
 
 bool CPDF_MeshStream::Load() {
   m_pStream->LoadAllDataFiltered();
-  m_BitStream = pdfium::MakeUnique<CFX_BitStream>(m_pStream->GetData(),
-                                                  m_pStream->GetSize());
+  m_BitStream = pdfium::MakeUnique<CFX_BitStream>(
+      pdfium::make_span(m_pStream->GetData(), m_pStream->GetSize()));
   CPDF_Dictionary* pDict = m_pShadingStream->GetDict();
   m_nCoordBits = pDict->GetIntegerFor("BitsPerCoordinate");
   m_nComponentBits = pDict->GetIntegerFor("BitsPerComponent");
diff --git a/core/fpdfapi/page/cpdf_psengine.cpp b/core/fpdfapi/page/cpdf_psengine.cpp
index adfd45e877..7fa8cd3001 100644
--- a/core/fpdfapi/page/cpdf_psengine.cpp
+++ b/core/fpdfapi/page/cpdf_psengine.cpp
@@ -190,8 +190,8 @@ int CPDF_PSEngine::PopInt() {
   return static_cast<int>(Pop());
 }
 
-bool CPDF_PSEngine::Parse(const ByteStringView& view) {
-  CPDF_SimpleParser parser(view);
+bool CPDF_PSEngine::Parse(pdfium::span<const uint8_t> input) {
+  CPDF_SimpleParser parser(input);
   return parser.GetWord() == "{" && m_MainProc.Parse(&parser, 0);
 }
 
diff --git a/core/fpdfapi/page/cpdf_psengine.h b/core/fpdfapi/page/cpdf_psengine.h
index 042a1c0895..9cb1e1a291 100644
--- a/core/fpdfapi/page/cpdf_psengine.h
+++ b/core/fpdfapi/page/cpdf_psengine.h
@@ -12,6 +12,7 @@
 
 #include "core/fxcrt/fx_string.h"
 #include "core/fxcrt/fx_system.h"
+#include "third_party/base/span.h"
 
 class CPDF_PSEngine;
 class CPDF_PSProc;
@@ -109,7 +110,7 @@ class CPDF_PSEngine {
   CPDF_PSEngine();
   ~CPDF_PSEngine();
 
-  bool Parse(const ByteStringView& str);
+  bool Parse(pdfium::span<const uint8_t> input);
   bool Execute();
   bool DoOperator(PDF_PSOP op);
   void Reset() { m_StackCount = 0; }
diff --git a/core/fpdfapi/page/cpdf_psfunc.cpp b/core/fpdfapi/page/cpdf_psfunc.cpp
index af996c056c..5499a47f99 100644
--- a/core/fpdfapi/page/cpdf_psfunc.cpp
+++ b/core/fpdfapi/page/cpdf_psfunc.cpp
@@ -16,7 +16,7 @@ CPDF_PSFunc::~CPDF_PSFunc() {}
 bool CPDF_PSFunc::v_Init(CPDF_Object* pObj) {
   auto pAcc = pdfium::MakeRetain<CPDF_StreamAcc>(pObj->AsStream());
   pAcc->LoadAllDataFiltered();
-  return m_PS.Parse(pAcc->GetDataView());
+  return m_PS.Parse(pAcc->GetSpan());
 }
 
 bool CPDF_PSFunc::v_Call(float* inputs, float* results) const {