ObjLoading: Be able to load and index IWD files

src/ObjCommon/Utils/ZlibFileWrapper.cpp

@@ -0,0 +1,87 @@
+#include "ZlibFileWrapper.h"
+#include <cassert>
+
+voidpf Wrapper_Zlib_FileOpen(voidpf opaque, const char*, int)
+{
+    return opaque;
+}
+
+uLong Wrapper_Zlib_FileRead(voidpf, voidpf stream, void* buf, const uLong size)
+{
+    auto* file = reinterpret_cast<FileAPI::IFile*>(stream);
+
+    return file->Read(buf, 1, size);
+}
+
+uLong Wrapper_Zlib_FileWrite(voidpf opaque, voidpf stream, const void* buf, const uLong size)
+{
+    auto* file = reinterpret_cast<FileAPI::IFile*>(stream);
+
+    return file->Write(buf, 1, size);
+}
+
+long Wrapper_Zlib_FileTell(voidpf opaque, voidpf stream)
+{
+    auto* file = reinterpret_cast<FileAPI::IFile*>(stream);
+
+    return static_cast<long>(file->Pos());
+}
+
+long Wrapper_Zlib_FileSeek(voidpf opaque, voidpf stream, const uLong offset, const int origin)
+{
+    auto* file = reinterpret_cast<FileAPI::IFile*>(stream);
+
+    switch (origin)
+    {
+    case ZLIB_FILEFUNC_SEEK_CUR:
+        file->Skip(offset);
+        break;
+
+    case ZLIB_FILEFUNC_SEEK_END:
+        assert(offset == 0);
+        file->GotoEnd();
+        break;
+
+    case ZLIB_FILEFUNC_SEEK_SET:
+        file->Goto(offset);
+        break;
+
+    default:
+        return -1;
+    }
+
+    return 0;
+}
+
+int Wrapper_Zlib_FileClose(voidpf opaque, voidpf stream)
+{
+    auto* file = reinterpret_cast<FileAPI::IFile*>(stream);
+
+    if (file->IsOpen())
+    {
+        file->Close();
+        return 0;
+    }
+
+    return -1;
+}
+
+int Wrapper_Zlib_FileError(voidpf opaque, voidpf stream)
+{
+    return 0;
+}
+
+zlib_filefunc_def ZlibFileWrapper::CreateFunctions32ForFile(FileAPI::IFile* file)
+{
+    return zlib_filefunc_def_s
+    {
+        Wrapper_Zlib_FileOpen,
+        Wrapper_Zlib_FileRead,
+        Wrapper_Zlib_FileWrite,
+        Wrapper_Zlib_FileTell,
+        Wrapper_Zlib_FileSeek,
+        Wrapper_Zlib_FileClose,
+        Wrapper_Zlib_FileError,
+        file
+    };
+}

src/ObjCommon/Utils/ZlibFileWrapper.h

@@ -0,0 +1,10 @@
+#pragma once
+
+#include <ioapi.h>
+#include "Utils/FileAPI.h"
+
+class ZlibFileWrapper
+{
+public:
+    static zlib_filefunc_def CreateFunctions32ForFile(FileAPI::IFile* file);
+};