From 194b55a799ffd68ffa27bff0051f74697601e107 Mon Sep 17 00:00:00 2001
From: Tom Finegan <tomfinegan@google.com>
Date: Fri, 12 Mar 2021 11:02:04 -0800
Subject: [PATCH] draco: Complete the large file support fix in the stdio
 reader.

Builds on the Windows-only fix added in
https://github.com/google/draco/pull/691
---
 cmake/draco_build_definitions.cmake |  5 +++++
 src/draco/io/stdio_file_reader.cc   | 11 ++++++-----
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/cmake/draco_build_definitions.cmake b/cmake/draco_build_definitions.cmake
index 3a232ba..f7354c1 100644
--- a/cmake/draco_build_definitions.cmake
+++ b/cmake/draco_build_definitions.cmake
@@ -63,6 +63,11 @@ macro(draco_set_build_definitions)
     if(BUILD_SHARED_LIBS)
       set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS TRUE)
     endif()
+  else()
+    if(${CMAKE_SIZEOF_VOID_P} EQUAL 8)
+      # Ensure 64-bit platforms can support large files.
+      list(APPEND draco_defines "_LARGEFILE_SOURCE" "_FILE_OFFSET_BITS=64")
+    endif()
   endif()
 
   if(ANDROID)
diff --git a/src/draco/io/stdio_file_reader.cc b/src/draco/io/stdio_file_reader.cc
index 09ce0fb..a99c96f 100644
--- a/src/draco/io/stdio_file_reader.cc
+++ b/src/draco/io/stdio_file_reader.cc
@@ -87,13 +87,14 @@ size_t StdioFileReader::GetFileSize() {
     return false;
   }
 
-  
-
-  #if defined(_WIN64)
+#if _FILE_OFFSET_BITS == 64
+  const size_t file_size = static_cast<size_t>(ftello(file_));
+#elif defined _WIN64
   const size_t file_size = static_cast<size_t>(_ftelli64(file_));
-  #else
+#else
   const size_t file_size = static_cast<size_t>(ftell(file_));
-  #endif
+#endif
+
   rewind(file_);
 
   return file_size;