1 files changed, 153 insertions, 0 deletions
diff --git a/src/fs/virtfs/fsziprwops.cpp b/src/fs/virtfs/fsziprwops.cpp
new file mode 100644
index 000000000..d994f6b79
--- /dev/null
+++ b/src/fs/virtfs/fsziprwops.cpp
@@ -0,0 +1,153 @@
+/*
+ *  The ManaPlus Client
+ *  Copyright (C) 2013-2017  The ManaPlus Developers
+ *
+ *  This file is part of The ManaPlus Client.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "fs/virtfs/fsziprwops.h"
+
+#include "logger.h"
+
+#include "fs/virtfs/file.h"
+#include "fs/virtfs/fs.h"
+
+#include <SDL_rwops.h>
+
+#include "debug.h"
+
+namespace VirtFs
+{
+
+namespace FsZip
+{
+    RWOPSINT rwops_seek(SDL_RWops *const rw,
+                        const RWOPSINT offset,
+                        const int whence)
+    {
+        if (!rw)
+            return -1;
+        File *const handle = static_cast<File *const>(
+            rw->hidden.unknown.data1);
+        size_t mPos = handle->mPos;
+        size_t mSize = handle->mSize;
+
+        RWOPSINT pos = 0;
+
+        if (whence == SEEK_SET)
+        {
+            pos = offset;
+        }
+        else if (whence == SEEK_CUR)
+        {
+            const int64_t current = mPos;
+            if (current == -1)
+            {
+                logger->assertLog(
+                    "VirtFs::rwops_seek: Can't find position in file.");
+                return -1;
+            }
+
+            pos = CAST_S32(current);
+            if (static_cast<int64_t>(pos) != current)
+            {
+                logger->assertLog("VirtFs::rwops_seek: "
+                    "Can't fit current file position in an int!");
+                return -1;
+            }
+
+            if (offset == 0)  /* this is a "tell" call. We're done. */
+                return pos;
+
+            pos += offset;
+        }
+        else if (whence == SEEK_END)
+        {
+            pos = static_cast<RWOPSINT>(mSize + offset);
+        }
+        else
+        {
+            logger->assertLog(
+                "VirtFs::rwops_seek: Invalid 'whence' parameter.");
+            return -1;
+        }
+
+        if (pos < 0)
+        {
+            logger->assertLog("VirtFs::rwops_seek: "
+                "Attempt to seek past start of file.");
+            return -1;
+        }
+
+        handle->mPos = pos;
+
+        if (pos > static_cast<RWOPSINT>(mSize))
+        {
+            logger->assertLog("VirtFs::rwops_seek: seek error.");
+            return -1;
+        }
+
+        return pos;
+    }
+
+    RWOPSSIZE rwops_read(SDL_RWops *const rw,
+                         void *const ptr,
+                         const RWOPSSIZE size,
+                         const RWOPSSIZE maxnum)
+    {
+        if (!rw)
+            return 0;
+        File *const handle = static_cast<File *const>(
+            rw->hidden.unknown.data1);
+        const int64_t rc = VirtFs::read(handle, ptr,
+            CAST_U32(size),
+            CAST_U32(maxnum));
+        return CAST_S32(rc);
+    }
+
+    RWOPSSIZE rwops_write(SDL_RWops *const rw A_UNUSED,
+                          const void *const ptr A_UNUSED,
+                          const RWOPSSIZE size A_UNUSED,
+                          const RWOPSSIZE num A_UNUSED)
+    {
+        return 0;
+    }
+
+    int rwops_close(SDL_RWops *const rw)
+    {
+        if (!rw)
+            return 0;
+        File *const handle = static_cast<File*>(
+            rw->hidden.unknown.data1);
+        delete handle;
+        SDL_FreeRW(rw);
+        return 0;
+    }
+
+#ifdef USE_SDL2
+    RWOPSINT rwops_size(SDL_RWops *const rw)
+    {
+        if (!rw)
+            return 0;
+        File *const handle = static_cast<File *const>(
+            rw->hidden.unknown.data1);
+        return handle->mSize;
+    }
+#endif  // USE_SDL2
+
+}  // namespace FsZip
+
+}  // namespace VirtFs