| 1 | /* Copyright (C) 2010-2020 The RetroArch team |
| 2 | * |
| 3 | * --------------------------------------------------------------------------------------- |
| 4 | * The following license statement only applies to this file (nbio_stdio.c). |
| 5 | * --------------------------------------------------------------------------------------- |
| 6 | * |
| 7 | * Permission is hereby granted, free of charge, |
| 8 | * to any person obtaining a copy of this software and associated documentation files (the "Software"), |
| 9 | * to deal in the Software without restriction, including without limitation the rights to |
| 10 | * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, |
| 11 | * and to permit persons to whom the Software is furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. |
| 14 | * |
| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, |
| 16 | * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| 18 | * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, |
| 19 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 20 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 21 | */ |
| 22 | |
| 23 | #include <stdio.h> |
| 24 | #include <stdlib.h> |
| 25 | #if defined(WIIU) |
| 26 | #include <malloc.h> |
| 27 | #endif |
| 28 | |
| 29 | #include <file/nbio.h> |
| 30 | #include <encodings/utf.h> |
| 31 | |
| 32 | /* Assume W-functions do not work below Win2K and Xbox platforms */ |
| 33 | #if defined(_WIN32_WINNT) && _WIN32_WINNT < 0x0500 || defined(_XBOX) |
| 34 | |
| 35 | #ifndef LEGACY_WIN32 |
| 36 | #define LEGACY_WIN32 |
| 37 | #endif |
| 38 | |
| 39 | #endif |
| 40 | |
| 41 | #if defined(_WIN32) |
| 42 | #if defined(_MSC_VER) && _MSC_VER >= 1400 |
| 43 | #define ATLEAST_VC2005 |
| 44 | #endif |
| 45 | #endif |
| 46 | |
| 47 | #if (defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE - 0) >= 200112) || (defined(__POSIX_VISIBLE) && __POSIX_VISIBLE >= 200112) || (defined(_POSIX_VERSION) && _POSIX_VERSION >= 200112) || __USE_LARGEFILE || (defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS == 64) |
| 48 | #ifndef HAVE_64BIT_OFFSETS |
| 49 | #define HAVE_64BIT_OFFSETS |
| 50 | #endif |
| 51 | #endif |
| 52 | |
| 53 | struct nbio_stdio_t |
| 54 | { |
| 55 | FILE* f; |
| 56 | void* data; |
| 57 | size_t progress; |
| 58 | size_t len; |
| 59 | /* |
| 60 | * possible values: |
| 61 | * NBIO_READ, NBIO_WRITE - obvious |
| 62 | * -1 - currently doing nothing |
| 63 | * -2 - the pointer was reallocated since the last operation |
| 64 | */ |
| 65 | signed char op; |
| 66 | signed char mode; |
| 67 | }; |
| 68 | |
| 69 | #if !defined(_WIN32) || defined(LEGACY_WIN32) |
| 70 | static const char *stdio_modes[] = { "rb", "wb", "r+b", "rb", "wb", "r+b" }; |
| 71 | #else |
| 72 | static const wchar_t *stdio_modes[] = { L"rb", L"wb", L"r+b", L"rb", L"wb", L"r+b" }; |
| 73 | #endif |
| 74 | |
| 75 | static int64_t fseek_wrap(FILE *f, int64_t offset, int origin) |
| 76 | { |
| 77 | #ifdef ATLEAST_VC2005 |
| 78 | /* VC2005 and up have a special 64-bit fseek */ |
| 79 | return _fseeki64(f, offset, origin); |
| 80 | #elif defined(HAVE_64BIT_OFFSETS) |
| 81 | return fseeko(f, (off_t)offset, origin); |
| 82 | #else |
| 83 | return fseek(f, (long)offset, origin); |
| 84 | #endif |
| 85 | } |
| 86 | |
| 87 | static int64_t ftell_wrap(FILE *f) |
| 88 | { |
| 89 | #ifdef ATLEAST_VC2005 |
| 90 | /* VC2005 and up have a special 64-bit ftell */ |
| 91 | return _ftelli64(f); |
| 92 | #elif defined(HAVE_64BIT_OFFSETS) |
| 93 | return ftello(f); |
| 94 | #else |
| 95 | return ftell(f); |
| 96 | #endif |
| 97 | } |
| 98 | |
| 99 | static void *nbio_stdio_open(const char * filename, unsigned mode) |
| 100 | { |
| 101 | void *buf = NULL; |
| 102 | struct nbio_stdio_t* handle = NULL; |
| 103 | int64_t len = 0; |
| 104 | #if !defined(_WIN32) || defined(LEGACY_WIN32) |
| 105 | FILE* f = fopen(filename, stdio_modes[mode]); |
| 106 | #else |
| 107 | wchar_t *filename_wide = utf8_to_utf16_string_alloc(filename); |
| 108 | FILE* f = _wfopen(filename_wide, stdio_modes[mode]); |
| 109 | |
| 110 | if (filename_wide) |
| 111 | free(filename_wide); |
| 112 | #endif |
| 113 | if (!f) |
| 114 | return NULL; |
| 115 | |
| 116 | handle = (struct nbio_stdio_t*)malloc(sizeof(struct nbio_stdio_t)); |
| 117 | |
| 118 | if (!handle) |
| 119 | goto error; |
| 120 | |
| 121 | handle->f = f; |
| 122 | |
| 123 | switch (mode) |
| 124 | { |
| 125 | case NBIO_WRITE: |
| 126 | case BIO_WRITE: |
| 127 | break; |
| 128 | default: |
| 129 | fseek_wrap(handle->f, 0, SEEK_END); |
| 130 | len = ftell_wrap(handle->f); |
| 131 | break; |
| 132 | } |
| 133 | |
| 134 | handle->mode = mode; |
| 135 | |
| 136 | #if defined(WIIU) |
| 137 | /* hit the aligned-buffer fast path on Wii U */ |
| 138 | if (len) |
| 139 | buf = memalign(0x40, (size_t)len); |
| 140 | #else |
| 141 | if (len) |
| 142 | buf = malloc((size_t)len); |
| 143 | #endif |
| 144 | |
| 145 | if (len && !buf) |
| 146 | goto error; |
| 147 | |
| 148 | handle->data = buf; |
| 149 | handle->len = len; |
| 150 | handle->progress = handle->len; |
| 151 | handle->op = -2; |
| 152 | |
| 153 | return handle; |
| 154 | |
| 155 | error: |
| 156 | if (handle) |
| 157 | free(handle); |
| 158 | fclose(f); |
| 159 | return NULL; |
| 160 | } |
| 161 | |
| 162 | static void nbio_stdio_begin_read(void *data) |
| 163 | { |
| 164 | struct nbio_stdio_t *handle = (struct nbio_stdio_t*)data; |
| 165 | if (!handle) |
| 166 | return; |
| 167 | |
| 168 | if (handle->op >= 0) |
| 169 | abort(); |
| 170 | |
| 171 | fseek_wrap(handle->f, 0, SEEK_SET); |
| 172 | |
| 173 | handle->op = NBIO_READ; |
| 174 | handle->progress = 0; |
| 175 | } |
| 176 | |
| 177 | static void nbio_stdio_begin_write(void *data) |
| 178 | { |
| 179 | struct nbio_stdio_t *handle = (struct nbio_stdio_t*)data; |
| 180 | if (!handle) |
| 181 | return; |
| 182 | |
| 183 | if (handle->op >= 0) |
| 184 | abort(); |
| 185 | |
| 186 | fseek_wrap(handle->f, 0, SEEK_SET); |
| 187 | handle->op = NBIO_WRITE; |
| 188 | handle->progress = 0; |
| 189 | } |
| 190 | |
| 191 | static bool nbio_stdio_iterate(void *data) |
| 192 | { |
| 193 | size_t amount = 65536; |
| 194 | struct nbio_stdio_t *handle = (struct nbio_stdio_t*)data; |
| 195 | |
| 196 | if (!handle) |
| 197 | return false; |
| 198 | |
| 199 | if (amount > handle->len - handle->progress) |
| 200 | amount = handle->len - handle->progress; |
| 201 | |
| 202 | switch (handle->op) |
| 203 | { |
| 204 | case NBIO_READ: |
| 205 | if (handle->mode == BIO_READ) |
| 206 | { |
| 207 | amount = handle->len; |
| 208 | fread((char*)handle->data, 1, amount, handle->f); |
| 209 | } |
| 210 | else |
| 211 | fread((char*)handle->data + handle->progress, 1, amount, handle->f); |
| 212 | break; |
| 213 | case NBIO_WRITE: |
| 214 | if (handle->mode == BIO_WRITE) |
| 215 | { |
| 216 | size_t written = 0; |
| 217 | amount = handle->len; |
| 218 | written = fwrite((char*)handle->data, 1, amount, handle->f); |
| 219 | if (written != amount) |
| 220 | return false; |
| 221 | } |
| 222 | else |
| 223 | fwrite((char*)handle->data + handle->progress, 1, amount, handle->f); |
| 224 | break; |
| 225 | } |
| 226 | |
| 227 | handle->progress += amount; |
| 228 | |
| 229 | if (handle->progress == handle->len) |
| 230 | handle->op = -1; |
| 231 | return (handle->op < 0); |
| 232 | } |
| 233 | |
| 234 | static void nbio_stdio_resize(void *data, size_t len) |
| 235 | { |
| 236 | void *new_data = NULL; |
| 237 | struct nbio_stdio_t *handle = (struct nbio_stdio_t*)data; |
| 238 | if (!handle) |
| 239 | return; |
| 240 | |
| 241 | if (handle->op >= 0) |
| 242 | abort(); |
| 243 | if (len < handle->len) |
| 244 | abort(); |
| 245 | |
| 246 | handle->len = len; |
| 247 | handle->progress = len; |
| 248 | handle->op = -1; |
| 249 | |
| 250 | new_data = realloc(handle->data, handle->len); |
| 251 | |
| 252 | if (new_data) |
| 253 | handle->data = new_data; |
| 254 | } |
| 255 | |
| 256 | static void *nbio_stdio_get_ptr(void *data, size_t* len) |
| 257 | { |
| 258 | struct nbio_stdio_t *handle = (struct nbio_stdio_t*)data; |
| 259 | if (!handle) |
| 260 | return NULL; |
| 261 | if (len) |
| 262 | *len = handle->len; |
| 263 | if (handle->op == -1) |
| 264 | return handle->data; |
| 265 | return NULL; |
| 266 | } |
| 267 | |
| 268 | static void nbio_stdio_cancel(void *data) |
| 269 | { |
| 270 | struct nbio_stdio_t *handle = (struct nbio_stdio_t*)data; |
| 271 | if (!handle) |
| 272 | return; |
| 273 | |
| 274 | handle->op = -1; |
| 275 | handle->progress = handle->len; |
| 276 | } |
| 277 | |
| 278 | static void nbio_stdio_free(void *data) |
| 279 | { |
| 280 | struct nbio_stdio_t *handle = (struct nbio_stdio_t*)data; |
| 281 | if (!handle) |
| 282 | return; |
| 283 | if (handle->op >= 0) |
| 284 | abort(); |
| 285 | fclose(handle->f); |
| 286 | free(handle->data); |
| 287 | |
| 288 | handle->f = NULL; |
| 289 | handle->data = NULL; |
| 290 | free(handle); |
| 291 | } |
| 292 | |
| 293 | nbio_intf_t nbio_stdio = { |
| 294 | nbio_stdio_open, |
| 295 | nbio_stdio_begin_read, |
| 296 | nbio_stdio_begin_write, |
| 297 | nbio_stdio_iterate, |
| 298 | nbio_stdio_resize, |
| 299 | nbio_stdio_get_ptr, |
| 300 | nbio_stdio_cancel, |
| 301 | nbio_stdio_free, |
| 302 | "nbio_stdio", |
| 303 | }; |