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Diffstat (limited to 'src/utils/physfsrwops.cpp')
| -rw-r--r-- | src/utils/physfsrwops.cpp | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/src/utils/physfsrwops.cpp b/src/utils/physfsrwops.cpp new file mode 100644 index 000000000..1960f0dee --- /dev/null +++ b/src/utils/physfsrwops.cpp @@ -0,0 +1,186 @@ +/* + * 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). + * + * Copyright (C) 2012 The ManaPlus Developers + */ + +#include <stdio.h> /* used for SEEK_SET, SEEK_CUR, SEEK_END ... */ +#include "utils/physfsrwops.h" + +#include "localconsts.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 = nullptr; + + if (!handle) + { + SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError()); + } + else + { + retval = SDL_AllocRW(); + if (retval) + { + 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 = nullptr; + if (!handle) + 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 ... */ |