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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1 | pmbaty | 1 | /* |
| 2 | * This file is part of the DXX-Rebirth project <https://www.dxx-rebirth.com/>. |
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| 3 | * It is copyright by its individual contributors, as recorded in the |
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| 4 | * project's Git history. See COPYING.txt at the top level for license |
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| 5 | * terms and a link to the Git history. |
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| 6 | */ |
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| 7 | /* |
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| 8 | * This code provides a glue layer between PhysicsFS and Simple Directmedia |
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| 9 | * Layer's (SDL) RWops i/o abstraction. |
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| 10 | * |
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| 11 | * License: this code is public domain. I make no warranty that it is useful, |
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| 12 | * correct, harmless, or environmentally safe. |
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| 13 | * |
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| 14 | * This particular file may be used however you like, including copying it |
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| 15 | * verbatim into a closed-source project, exploiting it commercially, and |
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| 16 | * removing any trace of my name from the source (although I hope you won't |
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| 17 | * do that). I welcome enhancements and corrections to this file, but I do |
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| 18 | * not require you to send me patches if you make changes. This code has |
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| 19 | * NO WARRANTY. |
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| 20 | * |
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| 21 | * Unless otherwise stated, the rest of PhysicsFS falls under the zlib license. |
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| 22 | * Please see LICENSE in the root of the source tree. |
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| 23 | * |
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| 24 | * SDL falls under the LGPL license. You can get SDL at https://www.libsdl.org/ |
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| 25 | * |
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| 26 | * This file was written by Ryan C. Gordon. (icculus@clutteredmind.org). |
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| 27 | */ |
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| 28 | |||
| 29 | #include <stdio.h> /* used for SEEK_SET, SEEK_CUR, SEEK_END ... */ |
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| 30 | #include "physfsrwops.h" |
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| 31 | |||
| 32 | #if SDL_MAJOR_VERSION == 1 |
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| 33 | #define SDL_RWops_callback_seek_position int |
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| 34 | #define SDL_RWops_callback_read_position int |
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| 35 | #define SDL_RWops_callback_write_position int |
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| 36 | #else |
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| 37 | #define SDL_RWops_callback_seek_position Sint64 |
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| 38 | #define SDL_RWops_callback_read_position size_t |
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| 39 | #define SDL_RWops_callback_write_position size_t |
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| 40 | #endif |
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| 41 | |||
| 42 | 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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| 43 | { |
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| 44 | PHYSFS_File *handle = reinterpret_cast<PHYSFS_File *>(rw->hidden.unknown.data1); |
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| 45 | SDL_RWops_callback_seek_position pos = 0; |
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| 46 | |||
| 47 | if (whence == SEEK_SET) |
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| 48 | { |
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| 49 | pos = offset; |
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| 50 | } /* if */ |
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| 51 | |||
| 52 | else if (whence == SEEK_CUR) |
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| 53 | { |
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| 54 | PHYSFS_sint64 current = PHYSFS_tell(handle); |
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| 55 | if (current == -1) |
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| 56 | { |
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| 57 | SDL_SetError("Can't find position in file: %s", |
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| 58 | PHYSFS_getLastError()); |
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| 59 | return(-1); |
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| 60 | } /* if */ |
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| 61 | |||
| 62 | #if SDL_MAJOR_VERSION == 1 |
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| 63 | pos = static_cast<int>(current); |
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| 64 | if (static_cast<PHYSFS_sint64>(pos) != current) |
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| 65 | { |
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| 66 | SDL_SetError("Can't fit current file position in an int!"); |
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| 67 | return(-1); |
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| 68 | } /* if */ |
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| 69 | #endif |
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| 70 | |||
| 71 | if (offset == 0) /* this is a "tell" call. We're done. */ |
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| 72 | return(pos); |
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| 73 | |||
| 74 | pos += offset; |
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| 75 | } /* else if */ |
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| 76 | |||
| 77 | else if (whence == SEEK_END) |
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| 78 | { |
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| 79 | PHYSFS_sint64 len = PHYSFS_fileLength(handle); |
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| 80 | if (len == -1) |
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| 81 | { |
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| 82 | SDL_SetError("Can't find end of file: %s", PHYSFS_getLastError()); |
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| 83 | return(-1); |
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| 84 | } /* if */ |
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| 85 | |||
| 86 | #if SDL_MAJOR_VERSION == 1 |
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| 87 | pos = static_cast<int>(len); |
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| 88 | if (static_cast<PHYSFS_sint64>(pos) != len) |
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| 89 | { |
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| 90 | SDL_SetError("Can't fit end-of-file position in an int!"); |
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| 91 | return(-1); |
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| 92 | } /* if */ |
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| 93 | #endif |
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| 94 | |||
| 95 | pos += offset; |
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| 96 | } /* else if */ |
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| 97 | |||
| 98 | else |
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| 99 | { |
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| 100 | SDL_SetError("Invalid 'whence' parameter."); |
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| 101 | return(-1); |
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| 102 | } /* else */ |
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| 103 | |||
| 104 | if ( pos < 0 ) |
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| 105 | { |
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| 106 | SDL_SetError("Attempt to seek past start of file."); |
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| 107 | return(-1); |
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| 108 | } /* if */ |
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| 109 | |||
| 110 | if (!PHYSFS_seek(handle, static_cast<PHYSFS_uint64>(pos))) |
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| 111 | { |
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| 112 | SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError()); |
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| 113 | return(-1); |
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| 114 | } /* if */ |
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| 115 | |||
| 116 | return(pos); |
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| 117 | } /* physfsrwops_seek */ |
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| 118 | |||
| 119 | |||
| 120 | 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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| 121 | { |
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| 122 | PHYSFS_File *handle = reinterpret_cast<PHYSFS_File *>(rw->hidden.unknown.data1); |
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| 123 | PHYSFS_sint64 rc = (PHYSFS_read)(handle, ptr, size, maxnum); |
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| 124 | if (rc != maxnum) |
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| 125 | { |
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| 126 | if (!PHYSFS_eof(handle)) /* not EOF? Must be an error. */ |
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| 127 | SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError()); |
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| 128 | } /* if */ |
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| 129 | return rc; |
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| 130 | } /* physfsrwops_read */ |
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| 131 | |||
| 132 | |||
| 133 | 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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| 134 | { |
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| 135 | PHYSFS_File *handle = reinterpret_cast<PHYSFS_File *>(rw->hidden.unknown.data1); |
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| 136 | PHYSFS_sint64 rc = (PHYSFS_write)(handle, reinterpret_cast<const uint8_t *>(ptr), size, num); |
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| 137 | if (rc != num) |
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| 138 | SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError()); |
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| 139 | return rc; |
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| 140 | } /* physfsrwops_write */ |
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| 141 | |||
| 142 | |||
| 143 | static int physfsrwops_close(SDL_RWops *rw) |
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| 144 | { |
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| 145 | PHYSFS_File *handle = reinterpret_cast<PHYSFS_File *>(rw->hidden.unknown.data1); |
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| 146 | if (!PHYSFS_close(handle)) |
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| 147 | { |
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| 148 | SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError()); |
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| 149 | return(-1); |
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| 150 | } /* if */ |
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| 151 | |||
| 152 | SDL_FreeRW(rw); |
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| 153 | return(0); |
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| 154 | } /* physfsrwops_close */ |
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| 155 | |||
| 156 | |||
| 157 | static RWops_ptr create_rwops(PHYSFS_File *handle) |
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| 158 | { |
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| 159 | if (handle == NULL) |
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| 160 | { |
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| 161 | SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError()); |
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| 162 | return nullptr; |
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| 163 | } |
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| 164 | else |
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| 165 | { |
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| 166 | RWops_ptr retval{SDL_AllocRW()}; |
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| 167 | if (retval) |
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| 168 | { |
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| 169 | retval->seek = physfsrwops_seek; |
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| 170 | retval->read = physfsrwops_read; |
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| 171 | retval->write = physfsrwops_write; |
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| 172 | retval->close = physfsrwops_close; |
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| 173 | retval->hidden.unknown.data1 = handle; |
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| 174 | } /* if */ |
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| 175 | return retval; |
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| 176 | } /* else */ |
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| 177 | } /* create_rwops */ |
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| 178 | |||
| 179 | |||
| 180 | RWops_ptr PHYSFSRWOPS_openRead(const char *fname) |
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| 181 | { |
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| 182 | return(create_rwops(PHYSFS_openRead(fname))); |
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| 183 | } /* PHYSFSRWOPS_openRead */ |
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| 184 | |||
| 185 | /* end of physfsrwops.c ... */ |
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| 186 |