From 7c377321ca62168658499f9753b9475a276d4506 Mon Sep 17 00:00:00 2001
From: Andrei Karas <akaras@inbox.ru>
Date: Wed, 29 Mar 2017 23:58:34 +0300
Subject: Move rwops functions into virtfsdir and virtfszip without
 optimisations.

---
 src/fs/virtfs/virtfsdirrwops.cpp | 182 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 182 insertions(+)
 create mode 100644 src/fs/virtfs/virtfsdirrwops.cpp

(limited to 'src/fs/virtfs/virtfsdirrwops.cpp')

diff --git a/src/fs/virtfs/virtfsdirrwops.cpp b/src/fs/virtfs/virtfsdirrwops.cpp
new file mode 100644
index 000000000..428e416b3
--- /dev/null
+++ b/src/fs/virtfs/virtfsdirrwops.cpp
@@ -0,0 +1,182 @@
+/*
+ *  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/virtfsdirrwops.h"
+
+#include "logger.h"
+
+#include "fs/virtfs/virtfile.h"
+#include "fs/virtfs/virtfs.h"
+
+#include <SDL_rwops.h>
+
+#include "debug.h"
+
+namespace VirtFsDir
+{
+    RWOPSINT rwops_seek(SDL_RWops *const rw,
+                        const RWOPSINT offset,
+                        const int whence)
+    {
+        if (!rw)
+            return -1;
+        VirtFile *const handle = static_cast<VirtFile *const>(
+            rw->hidden.unknown.data1);
+        RWOPSINT pos = 0;
+
+        if (whence == SEEK_SET)
+        {
+            pos = offset;
+        }
+        else if (whence == SEEK_CUR)
+        {
+            const int64_t current = VirtFs::tell(handle);
+            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)
+        {
+            const int64_t len = VirtFs::fileLength(handle);
+            if (len == -1)
+            {
+                logger->assertLog(
+                    "VirtFs::rwops_seek:Can't find end of file.");
+                return -1;
+            }
+
+            pos = static_cast<RWOPSINT>(len);
+            if (static_cast<int64_t>(pos) != len)
+            {
+                logger->assertLog("VirtFs::rwops_seek: "
+                    "Can't fit end-of-file position in an int!");
+                return -1;
+            }
+
+            pos += 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;
+        }
+
+        if (!VirtFs::seek(handle, static_cast<uint64_t>(pos)))
+        {
+            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;
+        VirtFile *const handle = static_cast<VirtFile *const>(
+            rw->hidden.unknown.data1);
+        const int64_t rc = VirtFs::read(handle, ptr,
+            CAST_U32(size),
+            CAST_U32(maxnum));
+        if (rc != static_cast<int64_t>(maxnum))
+        {
+            if (!VirtFs::eof(handle)) /* not EOF? Must be an error. */
+            {
+                logger->assertLog("VirtFs::rwops_seek: read error.");
+            }
+        }
+
+        return CAST_S32(rc);
+    }
+
+    RWOPSSIZE rwops_write(SDL_RWops *const rw,
+                          const void *const ptr,
+                          const RWOPSSIZE size,
+                          const RWOPSSIZE num)
+    {
+        if (!rw)
+            return 0;
+        VirtFile *const handle = static_cast<VirtFile *const>(
+            rw->hidden.unknown.data1);
+        const int64_t rc = VirtFs::write(handle, ptr,
+            CAST_U32(size),
+            CAST_U32(num));
+        if (rc != static_cast<int64_t>(num))
+        {
+            logger->assertLog("VirtFs::rwops_seek: write error.");
+        }
+
+        return CAST_S32(rc);
+    }
+
+    int rwops_close(SDL_RWops *const rw)
+    {
+        if (!rw)
+            return 0;
+        VirtFile *const handle = static_cast<VirtFile*>(
+            rw->hidden.unknown.data1);
+        if (!VirtFs::close(handle))
+        {
+            logger->assertLog("VirtFs::rwops_seek: close error.");
+            return -1;
+        }
+
+        SDL_FreeRW(rw);
+        return 0;
+    }
+
+#ifdef USE_SDL2
+    RWOPSINT rwops_size(SDL_RWops *const rw)
+    {
+        VirtFile *const handle = static_cast<VirtFile *const>(
+            rw->hidden.unknown.data1);
+        return VirtFs::fileLength(handle);
+    }
+#endif  // USE_SDL2
+
+}  // namespace VirtFsDir
-- 
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