187 lines
5.6 KiB
C++
187 lines
5.6 KiB
C++
/*
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* This file is part of the DXX-Rebirth project <https://www.dxx-rebirth.com/>.
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* It is copyright by its individual contributors, as recorded in the
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* project's Git history. See COPYING.txt at the top level for license
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* terms and a link to the Git history.
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*/
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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 in the root of the source tree.
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*
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* SDL falls under the LGPL license. You can get SDL at https://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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#if SDL_MAJOR_VERSION == 1
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#define SDL_RWops_callback_seek_position int
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#define SDL_RWops_callback_read_position int
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#define SDL_RWops_callback_write_position int
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#else
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#define SDL_RWops_callback_seek_position Sint64
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#define SDL_RWops_callback_read_position size_t
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#define SDL_RWops_callback_write_position size_t
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#endif
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static SDL_RWops_callback_seek_position physfsrwops_seek(SDL_RWops *rw, const SDL_RWops_callback_seek_position offset, const int whence)
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{
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PHYSFS_File *handle = reinterpret_cast<PHYSFS_File *>(rw->hidden.unknown.data1);
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SDL_RWops_callback_seek_position 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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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 SDL_MAJOR_VERSION == 1
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pos = static_cast<int>(current);
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if (static_cast<PHYSFS_sint64>(pos) != current)
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{
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SDL_SetError("Can't fit current file position in an int!");
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return(-1);
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} /* if */
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#endif
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if (offset == 0) /* this is a "tell" call. We're done. */
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return(pos);
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pos += offset;
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} /* else if */
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else if (whence == SEEK_END)
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{
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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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#if SDL_MAJOR_VERSION == 1
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pos = static_cast<int>(len);
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if (static_cast<PHYSFS_sint64>(pos) != len)
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{
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SDL_SetError("Can't fit end-of-file position in an int!");
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return(-1);
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} /* if */
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#endif
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pos += 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, static_cast<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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return(pos);
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} /* physfsrwops_seek */
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static SDL_RWops_callback_read_position physfsrwops_read(SDL_RWops *const rw, void *const ptr, const SDL_RWops_callback_read_position size, const SDL_RWops_callback_read_position maxnum)
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{
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PHYSFS_File *handle = reinterpret_cast<PHYSFS_File *>(rw->hidden.unknown.data1);
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PHYSFS_sint64 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 SDL_RWops_callback_write_position physfsrwops_write(SDL_RWops *const rw, const void *const ptr, const SDL_RWops_callback_write_position size, const SDL_RWops_callback_write_position num)
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{
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PHYSFS_File *handle = reinterpret_cast<PHYSFS_File *>(rw->hidden.unknown.data1);
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PHYSFS_sint64 rc = (PHYSFS_write)(handle, reinterpret_cast<const uint8_t *>(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 = reinterpret_cast<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 RWops_ptr create_rwops(PHYSFS_File *handle)
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{
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if (handle == NULL)
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{
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SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
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return nullptr;
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}
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else
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{
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RWops_ptr retval{SDL_AllocRW()};
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if (retval)
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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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return retval;
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} /* else */
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} /* create_rwops */
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RWops_ptr 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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/* end of physfsrwops.c ... */
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