author | sheepluva |
Wed, 15 Jan 2014 23:48:18 +0100 | |
changeset 9991 | 3858d99476f5 |
parent 9378 | 2be457289e60 |
child 10017 | de822cd3df3a |
permissions | -rw-r--r-- |
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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. This code has |
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* NO WARRANTY. |
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* |
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* Unless otherwise stated, the rest of PhysicsFS falls under the zlib license. |
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* Please see LICENSE.txt in the root of the source tree. |
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* |
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* SDL 1.2 falls under the LGPL license. SDL 1.3+ is zlib, like PhysicsFS. |
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* 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@icculus.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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/* SDL's RWOPS interface changed a little in SDL 1.3... */ |
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#if defined(SDL_VERSION_ATLEAST) |
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#if SDL_VERSION_ATLEAST(1, 3, 0) |
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#define TARGET_SDL13 1 |
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#endif |
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#endif |
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#if TARGET_SDL13 |
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static SDLCALL Sint64 physfsrwops_size(struct SDL_RWops *rw) |
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{ |
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PHYSFS_File *handle = (PHYSFS_File *) rw->hidden.unknown.data1; |
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return PHYSFS_fileLength(handle); |
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} |
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#endif |
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#if TARGET_SDL13 |
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static SDLCALL Sint64 physfsrwops_seek(struct SDL_RWops *rw, Sint64 offset, int whence) |
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#else |
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static int physfsrwops_seek(SDL_RWops *rw, int offset, int whence) |
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#endif |
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{ |
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PHYSFS_File *handle = (PHYSFS_File *) rw->hidden.unknown.data1; |
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PHYSFS_sint64 pos = 0; |
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if (whence == SEEK_SET) |
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pos = (PHYSFS_sint64) offset; |
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else if (whence == SEEK_CUR) |
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{ |
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const PHYSFS_sint64 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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{ |
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#if TARGET_SDL13 |
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return (long) current; |
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#else |
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return (int) current; |
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#endif |
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} /* if */ |
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pos = current + ((PHYSFS_sint64) offset); |
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} /* else if */ |
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else if (whence == SEEK_END) |
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{ |
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const PHYSFS_sint64 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 + ((PHYSFS_sint64) 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 ( pos < 0 ) |
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{ |
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SDL_SetError("Attempt to seek past start of file."); |
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return -1; |
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} /* if */ |
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if (!PHYSFS_seek(handle, (PHYSFS_uint64) 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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#if TARGET_SDL13 |
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return (long) pos; |
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#else |
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return (int) pos; |
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#endif |
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} /* physfsrwops_seek */ |
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#if TARGET_SDL13 |
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static size_t SDLCALL physfsrwops_read(struct SDL_RWops *rw, void *ptr, |
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size_t size, size_t maxnum) |
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#else |
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static int physfsrwops_read(SDL_RWops *rw, void *ptr, int size, int maxnum) |
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#endif |
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{ |
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PHYSFS_File *handle = (PHYSFS_File *) rw->hidden.unknown.data1; |
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const PHYSFS_uint64 readlen = (PHYSFS_uint64) (maxnum * size); |
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const PHYSFS_sint64 rc = PHYSFS_readBytes(handle, ptr, readlen); |
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if (rc != ((PHYSFS_sint64) readlen)) |
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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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#if TARGET_SDL13 |
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return (size_t) rc; |
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#else |
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return (int) rc; |
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#endif |
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} /* physfsrwops_read */ |
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#if TARGET_SDL13 |
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static size_t SDLCALL physfsrwops_write(struct SDL_RWops *rw, const void *ptr, |
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size_t size, size_t num) |
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#else |
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static int physfsrwops_write(SDL_RWops *rw, const void *ptr, int size, int num) |
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#endif |
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{ |
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PHYSFS_File *handle = (PHYSFS_File *) rw->hidden.unknown.data1; |
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const PHYSFS_uint64 writelen = (PHYSFS_uint64) (num * size); |
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const PHYSFS_sint64 rc = PHYSFS_writeBytes(handle, ptr, writelen); |
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if (rc != ((PHYSFS_sint64) writelen)) |
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SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError()); |
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#if TARGET_SDL13 |
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return (size_t) rc; |
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#else |
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return (int) rc; |
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#endif |
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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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koda
parents:
9309
diff
changeset
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#if TARGET_SDL13 |
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retval->size = physfsrwops_size; |
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#endif |
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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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