Remove const_cast<> from CFX_LZWDecompressor::Decode() caller.

Because the argument to Decode() can be const.  Part of the ongoing
war against const_cast<>.

Change-Id: I3a8402277dbfc4fd80b1dd60225de57b732713f8
Reviewed-on: https://pdfium-review.googlesource.com/39832
Reviewed-by: Ryan Harrison <rharrison@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>

3 files changed, 5 insertions, 6 deletions

diff --git a/core/fxcodec/gif/cfx_lzwdecompressor.cpp b/core/fxcodec/gif/cfx_lzwdecompressor.cpp
index d4fd43d321..a23106bb37 100644
--- a/core/fxcodec/gif/cfx_lzwdecompressor.cpp
+++ b/core/fxcodec/gif/cfx_lzwdecompressor.cpp
@@ -42,7 +42,7 @@ CFX_LZWDecompressor::CFX_LZWDecompressor(uint8_t color_exp, uint8_t code_exp)
 
 CFX_LZWDecompressor::~CFX_LZWDecompressor() {}
 
-CFX_GifDecodeStatus CFX_LZWDecompressor::Decode(uint8_t* src_buf,
+CFX_GifDecodeStatus CFX_LZWDecompressor::Decode(const uint8_t* src_buf,
                                                 uint32_t src_size,
                                                 uint8_t* dest_buf,
                                                 uint32_t* dest_size) {
diff --git a/core/fxcodec/gif/cfx_lzwdecompressor.h b/core/fxcodec/gif/cfx_lzwdecompressor.h
index 808f50a7cf..f4df065e34 100644
--- a/core/fxcodec/gif/cfx_lzwdecompressor.h
+++ b/core/fxcodec/gif/cfx_lzwdecompressor.h
@@ -24,7 +24,7 @@ class CFX_LZWDecompressor {
                                                      uint8_t code_exp);
   ~CFX_LZWDecompressor();
 
-  CFX_GifDecodeStatus Decode(uint8_t* src_buf,
+  CFX_GifDecodeStatus Decode(const uint8_t* src_buf,
                              uint32_t src_size,
                              uint8_t* dest_buf,
                              uint32_t* dest_size);
@@ -35,7 +35,6 @@ class CFX_LZWDecompressor {
   }
 
   std::vector<uint8_t>* DecompressedForTest() { return &decompressed_; }
-
   size_t* DecompressedNextForTest() { return &decompressed_next_; }
 
  private:
@@ -55,7 +54,7 @@ class CFX_LZWDecompressor {
   std::vector<uint8_t> decompressed_;
   size_t decompressed_next_;
   uint16_t code_old_;
-  uint8_t* next_in_;
+  const uint8_t* next_in_;
   uint32_t avail_in_;
   uint8_t bits_left_;
   uint32_t code_store_;
diff --git a/testing/fuzzers/pdf_lzw_fuzzer.cc b/testing/fuzzers/pdf_lzw_fuzzer.cc
index 7e10d2a1ee..e4d993e821 100644
--- a/testing/fuzzers/pdf_lzw_fuzzer.cc
+++ b/testing/fuzzers/pdf_lzw_fuzzer.cc
@@ -28,9 +28,9 @@ void LZWFuzz(const uint8_t* src_buf,
     // the initial data.
     uint32_t dest_size = static_cast<uint32_t>(dest_buf.size());
     if (CFX_GifDecodeStatus::InsufficientDestSize !=
-        decompressor->Decode(const_cast<uint8_t*>(src_buf), src_size,
-                             dest_buf.data(), &dest_size))
+        decompressor->Decode(src_buf, src_size, dest_buf.data(), &dest_size)) {
       return;
+    }
   }
 }