Initial add.
This commit is contained in:
Ryan C. Gordon
parent
cd58c9e523
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/*
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* This code provides a glue layer between PhysicsFS and Simple Directmedia
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* Layer's (SDL) RWops i/o abstraction.
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*
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* License: this code is public domain. I make no warranty that it is useful,
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* correct, harmless, or environmentally safe.
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*
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* This particular file may be used however you like, including copying it
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* verbatim into a closed-source project, exploiting it commercially, and
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* removing any trace of my name from the source (although I hope you won't
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* do that). I welcome enhancements and corrections to this file, but I do
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* not require you to send me patches if you make changes.
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*
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* Unless otherwise stated, the rest of PhysicsFS falls under the GNU Lesser
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* General Public License: http://www.gnu.org/licenses/lgpl.txt
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*
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* SDL falls under the LGPL, too. You can get SDL at http://www.libsdl.org/
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*
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* This file was written by Ryan C. Gordon. (icculus@clutteredmind.org).
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*/
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#include <stdio.h> /* used for SEEK_SET, SEEK_CUR, SEEK_END ... */
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#include "physfsrwops.h"
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static int physfsrwops_seek(SDL_RWops *rw, int offset, int whence)
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{
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PHYSFS_file *handle = (PHYSFS_file *) rw->hidden.unknown.data1;
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int pos = 0;
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if (whence == SEEK_SET)
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{
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pos = offset;
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} /* if */
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else if (whence == SEEK_CUR)
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{
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int current = PHYSFS_tell(handle);
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if (current == -1)
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{
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SDL_SetError("Can't find position in file: %s",
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PHYSFS_getLastError());
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return(-1);
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} /* if */
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if (offset == 0) /* this is a "tell" call. We're done. */
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return(offset);
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pos = current + offset;
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} /* else if */
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else if (whence == SEEK_END)
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{
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int len = PHYSFS_fileLength(handle);
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if (len == -1)
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{
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SDL_SetError("Can't find end of file: %s", PHYSFS_getLastError());
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return(-1);
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} /* if */
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pos = len + offset;
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} /* else if */
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else
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{
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SDL_SetError("Invalid 'whence' parameter.");
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return(-1);
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} /* else */
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if (!PHYSFS_seek(handle, pos))
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{
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SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
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return(-1);
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} /* if */
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return(pos);
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} /* physfsrwops_seek */
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static int physfsrwops_read(SDL_RWops *rw, void *ptr, int size, int maxnum)
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{
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PHYSFS_file *handle = (PHYSFS_file *) rw->hidden.unknown.data1;
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int rc = PHYSFS_read(handle, ptr, size, maxnum);
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if (rc != maxnum)
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{
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if (!PHYSFS_eof(handle)) /* not EOF? Must be an error. */
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SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
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} /* if */
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return(rc);
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} /* physfsrwops_read */
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static int physfsrwops_write(SDL_RWops *rw, const void *ptr, int size, int num)
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{
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PHYSFS_file *handle = (PHYSFS_file *) rw->hidden.unknown.data1;
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int rc = PHYSFS_write(handle, ptr, size, num);
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if (rc != num)
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SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
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return(rc);
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} /* physfsrwops_write */
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static int physfsrwops_close(SDL_RWops *rw)
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{
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PHYSFS_file *handle = (PHYSFS_file *) rw->hidden.unknown.data1;
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if (!PHYSFS_close(handle))
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{
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SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
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return(-1);
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} /* if */
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SDL_FreeRW(rw);
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return(0);
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} /* physfsrwops_close */
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static SDL_RWops *create_rwops(PHYSFS_file *handle)
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{
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SDL_RWops *retval = NULL;
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if (handle == NULL)
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SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
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else
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{
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retval = SDL_AllocRW();
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if (retval != NULL)
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{
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retval->seek = physfsrwops_seek;
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retval->read = physfsrwops_read;
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retval->write = physfsrwops_write;
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retval->close = physfsrwops_close;
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retval->hidden.unknown.data1 = handle;
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} /* if */
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} /* else */
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return(retval);
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} /* create_rwops */
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SDL_RWops *PHYSFSRWOPS_makeRWops(PHYSFS_file *handle)
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{
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SDL_RWops *retval = NULL;
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if (handle == NULL)
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SDL_SetError("NULL pointer passed to PHYSFSRWOPS_makeRWops().");
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else
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retval = create_rwops(handle);
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return(retval);
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} /* PHYSFSRWOPS_makeRWops */
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SDL_RWops *PHYSFSRWOPS_openRead(const char *fname)
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{
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return(create_rwops(PHYSFS_openRead(fname)));
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} /* PHYSFSRWOPS_openRead */
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SDL_RWops *PHYSFSRWOPS_openWrite(const char *fname)
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{
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return(create_rwops(PHYSFS_openWrite(fname)));
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} /* PHYSFSRWOPS_openWrite */
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SDL_RWops *PHYSFSRWOPS_openAppend(const char *fname)
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{
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return(create_rwops(PHYSFS_openAppend(fname)));
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} /* PHYSFSRWOPS_openAppend */
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/* end of physfsrwops.c ... */
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@ -0,0 +1,93 @@
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/*
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* This code provides a glue layer between PhysicsFS and Simple Directmedia
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* Layer's (SDL) RWops i/o abstraction.
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*
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* License: this code is public domain. I make no warranty that it is useful,
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* correct, harmless, or environmentally safe.
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*
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* This particular file may be used however you like, including copying it
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* verbatim into a closed-source project, exploiting it commercially, and
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* removing any trace of my name from the source (although I hope you won't
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* do that). I welcome enhancements and corrections to this file, but I do
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* not require you to send me patches if you make changes.
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*
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* Unless otherwise stated, the rest of PhysicsFS falls under the GNU Lesser
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* General Public License: http://www.gnu.org/licenses/lgpl.txt
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*
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* SDL falls under the LGPL, too. You can get SDL at http://www.libsdl.org/
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*
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* This file was written by Ryan C. Gordon. (icculus@clutteredmind.org).
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*/
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#ifndef _INCLUDE_PHYSFSRWOPS_H_
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#define _INCLUDE_PHYSFSRWOPS_H_
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#include "physfs.h"
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#include "SDL.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if (defined _MSC_VER)
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#define __EXPORT__ __declspec(dllexport)
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#else
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#define __EXPORT__
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#endif
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/**
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* Open a platform-independent filename for reading, and make it accessible
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* via an SDL_RWops structure. The file will be closed in PhysicsFS when the
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* RWops is closed. PhysicsFS should be configured to your liking before
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* opening files through this method.
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*
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* @param filename File to open in platform-independent notation.
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* @return A valid SDL_RWops structure on success, NULL on error. Specifics
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* of the error can be gleaned from PHYSFS_getLastError().
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*/
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__EXPORT__ SDL_RWops *PHYSFSRWOPS_openRead(const char *fname);
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/**
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* Open a platform-independent filename for writing, and make it accessible
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* via an SDL_RWops structure. The file will be closed in PhysicsFS when the
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* RWops is closed. PhysicsFS should be configured to your liking before
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* opening files through this method.
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*
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* @param filename File to open in platform-independent notation.
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* @return A valid SDL_RWops structure on success, NULL on error. Specifics
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* of the error can be gleaned from PHYSFS_getLastError().
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*/
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__EXPORT__ SDL_RWops *PHYSFSRWOPS_openWrite(const char *fname);
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/**
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* Open a platform-independent filename for appending, and make it accessible
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* via an SDL_RWops structure. The file will be closed in PhysicsFS when the
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* RWops is closed. PhysicsFS should be configured to your liking before
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* opening files through this method.
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*
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* @param filename File to open in platform-independent notation.
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* @return A valid SDL_RWops structure on success, NULL on error. Specifics
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* of the error can be gleaned from PHYSFS_getLastError().
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*/
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__EXPORT__ SDL_RWops *PHYSFSRWOPS_openAppend(const char *fname);
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/**
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* Make a SDL_RWops from an existing PhysicsFS file handle. You should
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* dispose of any references to the handle after successful creation of
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* the RWops. The actual PhysicsFS handle will be destroyed when the
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* RWops is closed.
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*
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* @param handle a valid PhysicsFS file handle.
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* @return A valid SDL_RWops structure on success, NULL on error. Specifics
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* of the error can be gleaned from PHYSFS_getLastError().
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*/
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__EXPORT__ SDL_RWops *PHYSFSRWOPS_makeRWops(PHYSFS_file *handle);
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#ifdef __cplusplus
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}
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#endif
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#endif /* include-once blocker */
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/* end of physfsrwops.h ... */
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