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Diffstat (limited to 'src/fs/virtfs/virtfsdirrwops.cpp')
| -rw-r--r-- | src/fs/virtfs/virtfsdirrwops.cpp | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/src/fs/virtfs/virtfsdirrwops.cpp b/src/fs/virtfs/virtfsdirrwops.cpp new file mode 100644 index 000000000..428e416b3 --- /dev/null +++ b/src/fs/virtfs/virtfsdirrwops.cpp @@ -0,0 +1,182 @@ +/* + * The ManaPlus Client + * Copyright (C) 2013-2017 The ManaPlus Developers + * + * This file is part of The ManaPlus Client. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include "fs/virtfs/virtfsdirrwops.h" + +#include "logger.h" + +#include "fs/virtfs/virtfile.h" +#include "fs/virtfs/virtfs.h" + +#include <SDL_rwops.h> + +#include "debug.h" + +namespace VirtFsDir +{ + RWOPSINT rwops_seek(SDL_RWops *const rw, + const RWOPSINT offset, + const int whence) + { + if (!rw) + return -1; + VirtFile *const handle = static_cast<VirtFile *const>( + rw->hidden.unknown.data1); + RWOPSINT pos = 0; + + if (whence == SEEK_SET) + { + pos = offset; + } + else if (whence == SEEK_CUR) + { + const int64_t current = VirtFs::tell(handle); + if (current == -1) + { + logger->assertLog( + "VirtFs::rwops_seek: Can't find position in file."); + return -1; + } + + pos = CAST_S32(current); + if (static_cast<int64_t>(pos) != current) + { + logger->assertLog("VirtFs::rwops_seek: " + "Can't fit current file position in an int!"); + return -1; + } + + if (offset == 0) /* this is a "tell" call. We're done. */ + return pos; + + pos += offset; + } + else if (whence == SEEK_END) + { + const int64_t len = VirtFs::fileLength(handle); + if (len == -1) + { + logger->assertLog( + "VirtFs::rwops_seek:Can't find end of file."); + return -1; + } + + pos = static_cast<RWOPSINT>(len); + if (static_cast<int64_t>(pos) != len) + { + logger->assertLog("VirtFs::rwops_seek: " + "Can't fit end-of-file position in an int!"); + return -1; + } + + pos += offset; + } + else + { + logger->assertLog( + "VirtFs::rwops_seek: Invalid 'whence' parameter."); + return -1; + } + + if (pos < 0) + { + logger->assertLog("VirtFs::rwops_seek: " + "Attempt to seek past start of file."); + return -1; + } + + if (!VirtFs::seek(handle, static_cast<uint64_t>(pos))) + { + logger->assertLog("VirtFs::rwops_seek: seek error."); + return -1; + } + + return pos; + } + + RWOPSSIZE rwops_read(SDL_RWops *const rw, + void *const ptr, + const RWOPSSIZE size, + const RWOPSSIZE maxnum) + { + if (!rw) + return 0; + VirtFile *const handle = static_cast<VirtFile *const>( + rw->hidden.unknown.data1); + const int64_t rc = VirtFs::read(handle, ptr, + CAST_U32(size), + CAST_U32(maxnum)); + if (rc != static_cast<int64_t>(maxnum)) + { + if (!VirtFs::eof(handle)) /* not EOF? Must be an error. */ + { + logger->assertLog("VirtFs::rwops_seek: read error."); + } + } + + return CAST_S32(rc); + } + + RWOPSSIZE rwops_write(SDL_RWops *const rw, + const void *const ptr, + const RWOPSSIZE size, + const RWOPSSIZE num) + { + if (!rw) + return 0; + VirtFile *const handle = static_cast<VirtFile *const>( + rw->hidden.unknown.data1); + const int64_t rc = VirtFs::write(handle, ptr, + CAST_U32(size), + CAST_U32(num)); + if (rc != static_cast<int64_t>(num)) + { + logger->assertLog("VirtFs::rwops_seek: write error."); + } + + return CAST_S32(rc); + } + + int rwops_close(SDL_RWops *const rw) + { + if (!rw) + return 0; + VirtFile *const handle = static_cast<VirtFile*>( + rw->hidden.unknown.data1); + if (!VirtFs::close(handle)) + { + logger->assertLog("VirtFs::rwops_seek: close error."); + return -1; + } + + SDL_FreeRW(rw); + return 0; + } + +#ifdef USE_SDL2 + RWOPSINT rwops_size(SDL_RWops *const rw) + { + VirtFile *const handle = static_cast<VirtFile *const>( + rw->hidden.unknown.data1); + return VirtFs::fileLength(handle); + } +#endif // USE_SDL2 + +} // namespace VirtFsDir |