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Diffstat (limited to 'src/utils/virtfsrwops.cpp')
| -rw-r--r-- | src/utils/virtfsrwops.cpp | 317 |
1 files changed, 317 insertions, 0 deletions
diff --git a/src/utils/virtfsrwops.cpp b/src/utils/virtfsrwops.cpp new file mode 100644 index 000000000..adcfa2784 --- /dev/null +++ b/src/utils/virtfsrwops.cpp @@ -0,0 +1,317 @@ +/* + * 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) 2012-2017 The ManaPlus Developers + */ + +#include "utils/virtfsrwops.h" + +#include "logger.h" + +#include "utils/fuzzer.h" +#include "utils/physfscheckutils.h" + +#include "debug.h" + +#ifdef USE_SDL2 +#define PHYSFSINT int64_t +#define PHYSFSSIZE size_t +#else // USE_SDL2 +#define PHYSFSINT int32_t +#define PHYSFSSIZE int +#endif // USE_SDL2 + +#ifdef DUMP_LEAKED_RESOURCES +static int openedRWops = 0; +#endif // DUMP_LEAKED_RESOURCES + +static PHYSFSINT physfsrwops_seek(SDL_RWops *const rw, + const PHYSFSINT offset, + const int whence) +{ + if (!rw) + return -1; + PHYSFS_file *const handle = static_cast<PHYSFS_file *const>( + rw->hidden.unknown.data1); + PHYSFSINT pos = 0; + + if (whence == SEEK_SET) + { + pos = offset; + } /* if */ + else if (whence == SEEK_CUR) + { + const int64_t current = VirtFs::tell(handle); + if (current == -1) + { + logger->assertLog( + "physfsrwops_seek: Can't find position in file: %s", + VirtFs::getLastError()); + return -1; + } /* if */ + + pos = CAST_S32(current); + if (static_cast<int64_t>(pos) != current) + { + logger->assertLog("physfsrwops_seek: " + "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) + { + const int64_t len = VirtFs::fileLength(handle); + if (len == -1) + { + logger->assertLog("physfsrwops_seek:Can't find end of file: %s", + VirtFs::getLastError()); + return -1; + } /* if */ + + pos = static_cast<PHYSFSINT>(len); + if (static_cast<int64_t>(pos) != len) + { + logger->assertLog("physfsrwops_seek: " + "Can't fit end-of-file position in an int!"); + return -1; + } /* if */ + + pos += offset; + } /* else if */ + else + { + logger->assertLog("physfsrwops_seek: Invalid 'whence' parameter."); + return -1; + } /* else */ + + if (pos < 0) + { + logger->assertLog("physfsrwops_seek: " + "Attempt to seek past start of file."); + return -1; + } /* if */ + + if (!VirtFs::seek(handle, static_cast<uint64_t>(pos))) + { + logger->assertLog("physfsrwops_seek: seek error: %s", + VirtFs::getLastError()); + return -1; + } /* if */ + + return pos; +} /* physfsrwops_seek */ + +static PHYSFSSIZE physfsrwops_read(SDL_RWops *const rw, + void *ptr, + const PHYSFSSIZE size, + const PHYSFSSIZE maxnum) +{ + if (!rw) + return 0; + PHYSFS_file *const handle = static_cast<PHYSFS_file *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("physfsrwops_seek: read error: %s", + PHYSFS_getLastError()); + } + } /* if */ + + return CAST_S32(rc); +} /* physfsrwops_read */ + +static PHYSFSSIZE physfsrwops_write(SDL_RWops *const rw, const void *ptr, + const PHYSFSSIZE size, + const PHYSFSSIZE num) +{ + if (!rw) + return 0; + PHYSFS_file *const handle = static_cast<PHYSFS_file *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("physfsrwops_seek: write error: %s", + PHYSFS_getLastError()); + } + + return CAST_S32(rc); +} /* physfsrwops_write */ + +static int physfsrwops_close(SDL_RWops *const rw) +{ + if (!rw) + return 0; + PHYSFS_file *const handle = static_cast<PHYSFS_file*>( + rw->hidden.unknown.data1); + if (!VirtFs::close(handle)) + { + logger->assertLog("physfsrwops_seek: close error: %s", + VirtFs::getLastError()); + return -1; + } /* if */ + + SDL_FreeRW(rw); +#ifdef DUMP_LEAKED_RESOURCES + if (openedRWops <= 0) + logger->assertLog("physfsrwops_seek: closing already closed RWops"); + openedRWops --; +#endif // DUMP_LEAKED_RESOURCES +#ifdef DEBUG_PHYSFS + FakePhysFSClose(rw); +#endif // DEBUG_PHYSFS + + return 0; +} /* physfsrwops_close */ + +#ifdef USE_SDL2 +static PHYSFSINT physfsrwops_size(SDL_RWops *const rw) +{ + PHYSFS_file *const handle = static_cast<PHYSFS_file*>( + rw->hidden.unknown.data1); + return VirtFs::fileLength(handle); +} /* physfsrwops_size */ +#endif // USE_SDL2 + +static SDL_RWops *create_rwops(PHYSFS_file *const handle) +{ + SDL_RWops *retval = nullptr; + + if (!handle) + { + logger->assertLog("physfsrwops_seek: create rwops error: %s", + VirtFs::getLastError()); + } + else + { + retval = SDL_AllocRW(); + if (retval) + { +#ifdef USE_SDL2 + retval->size = &physfsrwops_size; +#endif // USE_SDL2 + + retval->seek = &physfsrwops_seek; + retval->read = &physfsrwops_read; + retval->write = &physfsrwops_write; + retval->close = &physfsrwops_close; + retval->hidden.unknown.data1 = handle; + } /* if */ +#ifdef DUMP_LEAKED_RESOURCES + openedRWops ++; +#endif // DUMP_LEAKED_RESOURCES + } /* else */ + + return retval; +} /* create_rwops */ + +SDL_RWops *VirtFs::MakeRWops(PHYSFS_file *const handle) +{ + SDL_RWops *retval = nullptr; + if (!handle) + { + logger->assertLog("physfsrwops_seek: NULL pointer passed to " + "RWopsmakeRWops()."); + } + else + { + retval = create_rwops(handle); + } + + return retval; +} /* RWopsmakeRWops */ + +#ifdef __APPLE__ +static bool checkFilePath(const char *const fname) +{ + if (!fname || !*fname) + return false; + if (!VirtFs::exists(fname) || VirtFs::isDirectory(fname)) + return false; + return true; +} +#endif // __APPLE__ + +SDL_RWops *VirtFs::RWopsOpenRead(const char *const fname) +{ + BLOCK_START("RWopsopenRead") +#ifdef __APPLE__ + if (!checkFilePath(fname)) + return nullptr; +#endif // __APPLE__ +#ifdef USE_FUZZER + if (Fuzzer::conditionTerminate(fname)) + return nullptr; +#endif // USE_FUZZER +#ifdef USE_PROFILER + SDL_RWops *const ret = create_rwops(VirtFs::openRead(fname)); + BLOCK_END("RWopsopenRead") + return ret; +#else // USE_PROFILER + + return create_rwops(VirtFs::openRead(fname)); +#endif // USE_PROFILER +} /* RWopsopenRead */ + +SDL_RWops *VirtFs::RWopsOpenWrite(const char *const fname) +{ +#ifdef __APPLE__ + if (!checkFilePath(fname)) + return nullptr; +#endif // __APPLE__ + + return create_rwops(VirtFs::openWrite(fname)); +} /* RWopsopenWrite */ + +SDL_RWops *VirtFs::RWopsOpenAppend(const char *const fname) +{ +#ifdef __APPLE__ + if (!checkFilePath(fname)) + return nullptr; +#endif // __APPLE__ + + return create_rwops(VirtFs::openAppend(fname)); +} /* RWopsopenAppend */ + +#ifdef DUMP_LEAKED_RESOURCES +void VirtFs::reportRWops() +{ + if (openedRWops) + { + logger->assertLog("physfsrwops_seek: leaking RWops: %d", + openedRWops); + } +} +#endif // DUMP_LEAKED_RESOURCES + +/* end of physfsrwops.c ... */ |