Revert "Disable default file handler and Add hook so external project…

…s can hook their own internal file handling objects"

This reverts commit e1cff96.

imconfig.h

@@ -43,7 +43,7 @@
 //#define IMGUI_DISABLE_DEFAULT_FORMAT_FUNCTIONS            // Don't implement ImFormatString/ImFormatStringV so you can implement them yourself (e.g. if you don't want to link with vsnprintf)
 //#define IMGUI_DISABLE_DEFAULT_MATH_FUNCTIONS              // Don't implement ImFabs/ImSqrt/ImPow/ImFmod/ImCos/ImSin/ImAcos/ImAtan2 so you can implement them yourself.
 //#define IMGUI_DISABLE_FILE_FUNCTIONS                      // Don't implement ImFileOpen/ImFileClose/ImFileRead/ImFileWrite and ImFileHandle at all (replace them with dummies)
-#define IMGUI_DISABLE_DEFAULT_FILE_FUNCTIONS              // Don't implement ImFileOpen/ImFileClose/ImFileRead/ImFileWrite so you can implement them yourself if you don't want to link with fopen/fclose/fread/fwrite. This will also disable the LogToTTY() function.
+//#define IMGUI_DISABLE_DEFAULT_FILE_FUNCTIONS              // Don't implement ImFileOpen/ImFileClose/ImFileRead/ImFileWrite and ImFileHandle so you can implement them yourself if you don't want to link with fopen/fclose/fread/fwrite. This will also disable the LogToTTY() function.
 //#define IMGUI_DISABLE_DEFAULT_ALLOCATORS                  // Don't implement default allocators calling malloc()/free() to avoid linking with them. You will need to call ImGui::SetAllocatorFunctions().
 //#define IMGUI_DISABLE_SSE                                 // Disable use of SSE intrinsics even if available
 

imgui.cpp

@@ -1565,49 +1565,7 @@ bool    ImFileClose(ImFileHandle f)     { return fclose(f) == 0; }
 ImU64   ImFileGetSize(ImFileHandle f)   { long off = 0, sz = 0; return ((off = ftell(f)) != -1 && !fseek(f, 0, SEEK_END) && (sz = ftell(f)) != -1 && !fseek(f, off, SEEK_SET)) ? (ImU64)sz : (ImU64)-1; }
 ImU64   ImFileRead(void* data, ImU64 sz, ImU64 count, ImFileHandle f)           { return fread(data, (size_t)sz, (size_t)count, f); }
 ImU64   ImFileWrite(const void* data, ImU64 sz, ImU64 count, ImFileHandle f)    { return fwrite(data, (size_t)sz, (size_t)count, f); }
-#else
-//Functions to redirect to our hook object function calls if it exists
-ImFileHandle      ImFileOpen(const char* filename, const char* mode) {
-    if (auto context = ImGui::GetCurrentContext()) {
-        if (ImIFileHelper* fileHelperPtr = context->FileHelper) {
-            return fileHelperPtr->ImFileOpen(filename, mode);
-        }
-    }
-    return nullptr;
-}
-bool              ImFileClose(ImFileHandle file) {
-    if (auto context = ImGui::GetCurrentContext()) {
-        if (ImIFileHelper* fileHelperPtr = context->FileHelper) {
-            return fileHelperPtr->ImFileClose(file);
-        }
-    }
-    return false;
-}
-ImU64             ImFileGetSize(ImFileHandle file) {
-    if (auto context = ImGui::GetCurrentContext()) {
-        if (ImIFileHelper* fileHelperPtr = context->FileHelper) {
-            return fileHelperPtr->ImFileGetSize(file);
-        }
-    }
-    return 0;
-}
-ImU64             ImFileRead(void* data, ImU64 size, ImU64 count, ImFileHandle file) {
-    if (auto context = ImGui::GetCurrentContext()) {
-        if (ImIFileHelper* fileHelperPtr = context->FileHelper) {
-            return fileHelperPtr->ImFileRead(data, size, count, file);
-        }
-    }
-    return 0;
-}
-ImU64             ImFileWrite(const void* data, ImU64 size, ImU64 count, ImFileHandle file) {
-    if (auto context = ImGui::GetCurrentContext()) {
-        if (ImIFileHelper* fileHelperPtr = context->FileHelper) {
-            return fileHelperPtr->ImFileWrite(data, size, count, file);
-        }
-    }
-    return 0;
-}
-#endif
+#endif // #ifndef IMGUI_DISABLE_DEFAULT_FILE_FUNCTIONS
 
 // Helper: Load file content into memory
 // Memory allocated with IM_ALLOC(), must be freed by user using IM_FREE() == ImGui::MemFree()

imgui_internal.h

@@ -372,25 +372,8 @@ IMGUI_API bool              ImFileClose(ImFileHandle file);
 IMGUI_API ImU64             ImFileGetSize(ImFileHandle file);
 IMGUI_API ImU64             ImFileRead(void* data, ImU64 size, ImU64 count, ImFileHandle file);
 IMGUI_API ImU64             ImFileWrite(const void* data, ImU64 size, ImU64 count, ImFileHandle file);
-#else //Bedrock File Handler Hook so we can use our own internal file handling
+#else
 #define IMGUI_DISABLE_TTY_FUNCTIONS // Can't use stdout, fflush if we are not using default file functions
-//We'll cast this to our own internal type as needed
-typedef void* ImFileHandle;
-//Helper struct for hooking file operations to external systems
-struct ImIFileHelper {
-    virtual ~ImIFileHelper() = default;
-    virtual ImFileHandle  ImFileOpen(const char* filename, const char* mode) = 0;
-    virtual bool          ImFileClose(ImFileHandle file) = 0;
-    virtual ImU64         ImFileGetSize(ImFileHandle file) = 0;
-    virtual ImU64         ImFileRead(void* data, ImU64 size, ImU64 count, ImFileHandle file) = 0;
-    virtual ImU64         ImFileWrite(const void* data, ImU64 size, ImU64 count, ImFileHandle file) = 0;
-};
-
-IMGUI_API ImFileHandle      ImFileOpen(const char* filename, const char* mode);
-IMGUI_API bool              ImFileClose(ImFileHandle file);
-IMGUI_API ImU64             ImFileGetSize(ImFileHandle file);
-IMGUI_API ImU64             ImFileRead(void* data, ImU64 size, ImU64 count, ImFileHandle file);
-IMGUI_API ImU64             ImFileWrite(const void* data, ImU64 size, ImU64 count, ImFileHandle file);
 #endif
 IMGUI_API void*             ImFileLoadToMemory(const char* filename, const char* mode, size_t* out_file_size = NULL, int padding_bytes = 0);
 
@@ -1616,9 +1599,6 @@ struct ImGuiContext
     ImChunkStream<ImGuiTableSettings>   SettingsTables;         // ImGuiTable .ini settings entries
     ImVector<ImGuiContextHook>          Hooks;                  // Hooks for extensions (e.g. test engine)
     ImGuiID                             HookIdNext;             // Next available HookId
-#ifdef IMGUI_DISABLE_DEFAULT_FILE_FUNCTIONS
-    ImIFileHelper* FileHelper = nullptr;                        // Hook object for external source to implement their own fileIO
-#endif
 
     // Capture/Logging
     bool                    LogEnabled;                         // Currently capturing