--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/physfs/extras/physfsrwops.c Sat Oct 20 00:20:39 2012 +0400
@@ -0,0 +1,219 @@
+/*
+ * This code provides a glue layer between PhysicsFS and Simple Directmedia
+ * Layer's (SDL) RWops i/o abstraction.
+ *
+ * License: this code is public domain. I make no warranty that it is useful,
+ * correct, harmless, or environmentally safe.
+ *
+ * This particular file may be used however you like, including copying it
+ * verbatim into a closed-source project, exploiting it commercially, and
+ * removing any trace of my name from the source (although I hope you won't
+ * do that). I welcome enhancements and corrections to this file, but I do
+ * not require you to send me patches if you make changes. This code has
+ * NO WARRANTY.
+ *
+ * Unless otherwise stated, the rest of PhysicsFS falls under the zlib license.
+ * Please see LICENSE.txt in the root of the source tree.
+ *
+ * SDL 1.2 falls under the LGPL license. SDL 1.3+ is zlib, like PhysicsFS.
+ * You can get SDL at http://www.libsdl.org/
+ *
+ * This file was written by Ryan C. Gordon. (icculus@icculus.org).
+ */
+
+#include <stdio.h> /* used for SEEK_SET, SEEK_CUR, SEEK_END ... */
+#include "physfsrwops.h"
+
+/* SDL's RWOPS interface changed a little in SDL 1.3... */
+#if defined(SDL_VERSION_ATLEAST)
+#if SDL_VERSION_ATLEAST(1, 3, 0)
+#define TARGET_SDL13 1
+#endif
+#endif
+
+#if TARGET_SDL13
+static long SDLCALL physfsrwops_seek(struct SDL_RWops *rw, long offset, int whence)
+#else
+static int physfsrwops_seek(SDL_RWops *rw, int offset, int whence)
+#endif
+{
+ PHYSFS_File *handle = (PHYSFS_File *) rw->hidden.unknown.data1;
+ PHYSFS_sint64 pos = 0;
+
+ if (whence == SEEK_SET)
+ pos = (PHYSFS_sint64) offset;
+
+ else if (whence == SEEK_CUR)
+ {
+ const PHYSFS_sint64 current = PHYSFS_tell(handle);
+ if (current == -1)
+ {
+ SDL_SetError("Can't find position in file: %s",
+ PHYSFS_getLastError());
+ return -1;
+ } /* if */
+
+ if (offset == 0) /* this is a "tell" call. We're done. */
+ {
+ #if TARGET_SDL13
+ return (long) current;
+ #else
+ return (int) current;
+ #endif
+ } /* if */
+
+ pos = current + ((PHYSFS_sint64) offset);
+ } /* else if */
+
+ else if (whence == SEEK_END)
+ {
+ const PHYSFS_sint64 len = PHYSFS_fileLength(handle);
+ if (len == -1)
+ {
+ SDL_SetError("Can't find end of file: %s", PHYSFS_getLastError());
+ return -1;
+ } /* if */
+
+ pos = len + ((PHYSFS_sint64) offset);
+ } /* else if */
+
+ else
+ {
+ SDL_SetError("Invalid 'whence' parameter.");
+ return -1;
+ } /* else */
+
+ if ( pos < 0 )
+ {
+ SDL_SetError("Attempt to seek past start of file.");
+ return -1;
+ } /* if */
+
+ if (!PHYSFS_seek(handle, (PHYSFS_uint64) pos))
+ {
+ SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
+ return -1;
+ } /* if */
+
+ #if TARGET_SDL13
+ return (long) pos;
+ #else
+ return (int) pos;
+ #endif
+} /* physfsrwops_seek */
+
+
+#if TARGET_SDL13
+static size_t SDLCALL physfsrwops_read(struct SDL_RWops *rw, void *ptr,
+ size_t size, size_t maxnum)
+#else
+static int physfsrwops_read(SDL_RWops *rw, void *ptr, int size, int maxnum)
+#endif
+{
+ PHYSFS_File *handle = (PHYSFS_File *) rw->hidden.unknown.data1;
+ const PHYSFS_uint64 readlen = (PHYSFS_uint64) (maxnum * size);
+ const PHYSFS_sint64 rc = PHYSFS_readBytes(handle, ptr, readlen);
+ if (rc != ((PHYSFS_sint64) readlen))
+ {
+ if (!PHYSFS_eof(handle)) /* not EOF? Must be an error. */
+ SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
+ } /* if */
+
+ #if TARGET_SDL13
+ return (size_t) rc;
+ #else
+ return (int) rc;
+ #endif
+} /* physfsrwops_read */
+
+
+#if TARGET_SDL13
+static size_t SDLCALL physfsrwops_write(struct SDL_RWops *rw, const void *ptr,
+ size_t size, size_t num)
+#else
+static int physfsrwops_write(SDL_RWops *rw, const void *ptr, int size, int num)
+#endif
+{
+ PHYSFS_File *handle = (PHYSFS_File *) rw->hidden.unknown.data1;
+ const PHYSFS_uint64 writelen = (PHYSFS_uint64) (num * size);
+ const PHYSFS_sint64 rc = PHYSFS_writeBytes(handle, ptr, writelen);
+ if (rc != ((PHYSFS_sint64) writelen))
+ SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
+
+ #if TARGET_SDL13
+ return (size_t) rc;
+ #else
+ return (int) rc;
+ #endif
+} /* physfsrwops_write */
+
+
+static int physfsrwops_close(SDL_RWops *rw)
+{
+ PHYSFS_File *handle = (PHYSFS_File *) rw->hidden.unknown.data1;
+ if (!PHYSFS_close(handle))
+ {
+ SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
+ return -1;
+ } /* if */
+
+ SDL_FreeRW(rw);
+ return 0;
+} /* physfsrwops_close */
+
+
+static SDL_RWops *create_rwops(PHYSFS_File *handle)
+{
+ SDL_RWops *retval = NULL;
+
+ if (handle == NULL)
+ SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
+ else
+ {
+ retval = SDL_AllocRW();
+ if (retval != NULL)
+ {
+ retval->seek = physfsrwops_seek;
+ retval->read = physfsrwops_read;
+ retval->write = physfsrwops_write;
+ retval->close = physfsrwops_close;
+ retval->hidden.unknown.data1 = handle;
+ } /* if */
+ } /* else */
+
+ return retval;
+} /* create_rwops */
+
+
+SDL_RWops *PHYSFSRWOPS_makeRWops(PHYSFS_File *handle)
+{
+ SDL_RWops *retval = NULL;
+ if (handle == NULL)
+ SDL_SetError("NULL pointer passed to PHYSFSRWOPS_makeRWops().");
+ else
+ retval = create_rwops(handle);
+
+ return retval;
+} /* PHYSFSRWOPS_makeRWops */
+
+
+SDL_RWops *PHYSFSRWOPS_openRead(const char *fname)
+{
+ return create_rwops(PHYSFS_openRead(fname));
+} /* PHYSFSRWOPS_openRead */
+
+
+SDL_RWops *PHYSFSRWOPS_openWrite(const char *fname)
+{
+ return create_rwops(PHYSFS_openWrite(fname));
+} /* PHYSFSRWOPS_openWrite */
+
+
+SDL_RWops *PHYSFSRWOPS_openAppend(const char *fname)
+{
+ return create_rwops(PHYSFS_openAppend(fname));
+} /* PHYSFSRWOPS_openAppend */
+
+
+/* end of physfsrwops.c ... */
+