diff options
Diffstat (limited to 'src/utils')
| -rw-r--r-- | src/utils/physfsrwops.cpp | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/src/utils/physfsrwops.cpp b/src/utils/physfsrwops.cpp new file mode 100644 index 000000000..1a5a71374 --- /dev/null +++ b/src/utils/physfsrwops.cpp @@ -0,0 +1,193 @@ +/* + * 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 falls under the LGPL license. 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" + +static int physfsrwops_seek(SDL_RWops *rw, int offset, int whence) +{ + PHYSFS_File *handle = (PHYSFS_File *) rw->hidden.unknown.data1; + int pos = 0; + + if (whence == SEEK_SET) + { + pos = offset; + } /* if */ + + else if (whence == SEEK_CUR) + { + PHYSFS_sint64 current = PHYSFS_tell(handle); + if (current == -1) + { + SDL_SetError("Can't find position in file: %s", + PHYSFS_getLastError()); + return(-1); + } /* if */ + + pos = (int) current; + if ( ((PHYSFS_sint64) pos) != current ) + { + SDL_SetError("Can't fit current file position in an int!"); + return(-1); + } /* if */ + + if (offset == 0) /* this is a "tell" call. We're done. */ + return(pos); + + pos += offset; + } /* else if */ + + else if (whence == SEEK_END) + { + PHYSFS_sint64 len = PHYSFS_fileLength(handle); + if (len == -1) + { + SDL_SetError("Can't find end of file: %s", PHYSFS_getLastError()); + return(-1); + } /* if */ + + pos = (int) len; + if ( ((PHYSFS_sint64) pos) != len ) + { + SDL_SetError("Can't fit end-of-file position in an int!"); + return(-1); + } /* if */ + + pos += 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 */ + + return(pos); +} /* physfsrwops_seek */ + + +static int physfsrwops_read(SDL_RWops *rw, void *ptr, int size, int maxnum) +{ + PHYSFS_File *handle = (PHYSFS_File *) rw->hidden.unknown.data1; + PHYSFS_sint64 rc = PHYSFS_read(handle, ptr, size, maxnum); + if (rc != maxnum) + { + if (!PHYSFS_eof(handle)) /* not EOF? Must be an error. */ + SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError()); + } /* if */ + + return((int) rc); +} /* physfsrwops_read */ + + +static int physfsrwops_write(SDL_RWops *rw, const void *ptr, int size, int num) +{ + PHYSFS_File *handle = (PHYSFS_File *) rw->hidden.unknown.data1; + PHYSFS_sint64 rc = PHYSFS_write(handle, ptr, size, num); + if (rc != num) + SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError()); + + return((int) rc); +} /* 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 ... */ + |