src/file/SDL_rwops.c
author Ryan C. Gordon <icculus@icculus.org>
Tue, 10 Jul 2007 19:06:02 +0000
changeset 2165 c2ffcc627701
parent 2164 d083a2e4433d
child 2173 26233707bc94
permissions -rw-r--r--
Merged r3201:3204 from branches/SDL-1.2: win32 rwops tweaks.
slouken@0
     1
/*
slouken@0
     2
    SDL - Simple DirectMedia Layer
slouken@1312
     3
    Copyright (C) 1997-2006 Sam Lantinga
slouken@0
     4
slouken@0
     5
    This library is free software; you can redistribute it and/or
slouken@1312
     6
    modify it under the terms of the GNU Lesser General Public
slouken@0
     7
    License as published by the Free Software Foundation; either
slouken@1312
     8
    version 2.1 of the License, or (at your option) any later version.
slouken@0
     9
slouken@0
    10
    This library is distributed in the hope that it will be useful,
slouken@0
    11
    but WITHOUT ANY WARRANTY; without even the implied warranty of
slouken@0
    12
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
slouken@1312
    13
    Lesser General Public License for more details.
slouken@0
    14
slouken@1312
    15
    You should have received a copy of the GNU Lesser General Public
slouken@1312
    16
    License along with this library; if not, write to the Free Software
slouken@1312
    17
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
slouken@0
    18
slouken@0
    19
    Sam Lantinga
slouken@252
    20
    slouken@libsdl.org
slouken@0
    21
*/
slouken@1402
    22
#include "SDL_config.h"
slouken@0
    23
slouken@0
    24
/* This file provides a general interface for SDL to read and write
slouken@0
    25
   data sources.  It can easily be extended to files, memory, etc.
slouken@0
    26
*/
slouken@0
    27
slouken@1354
    28
#include "SDL_endian.h"
slouken@0
    29
#include "SDL_rwops.h"
slouken@1330
    30
slouken@1354
    31
slouken@2159
    32
#ifdef __WIN32__
slouken@0
    33
slouken@1447
    34
/* Functions to read/write Win32 API file pointers */
slouken@1465
    35
/* Will not use it on WinCE because stdio is buffered, it means
slouken@1465
    36
   faster, and all stdio functions anyway are embedded in coredll.dll - 
slouken@1465
    37
   the main wince dll*/
slouken@0
    38
slouken@1446
    39
#define WINDOWS_LEAN_AND_MEAN
slouken@1446
    40
#include <windows.h>
slouken@1446
    41
slouken@1465
    42
#ifndef INVALID_SET_FILE_POINTER
slouken@1465
    43
#define INVALID_SET_FILE_POINTER 0xFFFFFFFF
slouken@1465
    44
#endif
slouken@1465
    45
slouken@2159
    46
#define READAHEAD_BUFFER_SIZE	1024
slouken@2159
    47
slouken@1895
    48
static int SDLCALL
slouken@1895
    49
win32_file_open(SDL_RWops * context, const char *filename, const char *mode)
slouken@1465
    50
{
slouken@1465
    51
#ifndef _WIN32_WCE
slouken@1895
    52
    UINT old_error_mode;
slouken@1465
    53
#endif
slouken@1895
    54
    HANDLE h;
slouken@1895
    55
    DWORD r_right, w_right;
slouken@1895
    56
    DWORD must_exist, truncate;
slouken@1895
    57
    int a_mode;
slouken@1446
    58
slouken@1895
    59
    if (!context)
slouken@2164
    60
        return -1;              /* failed (invalid call) */
slouken@2159
    61
icculus@2165
    62
    context->hidden.win32io.h = INVALID_HANDLE_VALUE; /* mark this as unusable */
icculus@2165
    63
    context->hidden.win32io.buffer.data = NULL;
icculus@2165
    64
    context->hidden.win32io.buffer.size = 0;
icculus@2165
    65
    context->hidden.win32io.buffer.left = 0;
icculus@2165
    66
slouken@1895
    67
    /* "r" = reading, file must exist */
slouken@1895
    68
    /* "w" = writing, truncate existing, file may not exist */
slouken@1895
    69
    /* "r+"= reading or writing, file must exist            */
slouken@1895
    70
    /* "a" = writing, append file may not exist             */
slouken@1895
    71
    /* "a+"= append + read, file may not exist              */
slouken@1895
    72
    /* "w+" = read, write, truncate. file may not exist    */
slouken@1895
    73
slouken@1895
    74
    must_exist = (SDL_strchr(mode, 'r') != NULL) ? OPEN_EXISTING : 0;
slouken@1895
    75
    truncate = (SDL_strchr(mode, 'w') != NULL) ? CREATE_ALWAYS : 0;
slouken@1895
    76
    r_right = (SDL_strchr(mode, '+') != NULL
slouken@1895
    77
               || must_exist) ? GENERIC_READ : 0;
slouken@1895
    78
    a_mode = (SDL_strchr(mode, 'a') != NULL) ? OPEN_ALWAYS : 0;
slouken@1895
    79
    w_right = (a_mode || SDL_strchr(mode, '+')
slouken@1895
    80
               || truncate) ? GENERIC_WRITE : 0;
slouken@1895
    81
slouken@1895
    82
    if (!r_right && !w_right)   /* inconsistent mode */
slouken@1895
    83
        return -1;              /* failed (invalid call) */
slouken@1465
    84
icculus@2165
    85
    context->hidden.win32io.buffer.data = (char *)SDL_malloc(READAHEAD_BUFFER_SIZE);
icculus@2165
    86
    if (!context->hidden.win32io.buffer.data) {
icculus@2165
    87
        SDL_OutOfMemory();
icculus@2165
    88
        return -1;
icculus@2165
    89
    }
icculus@2165
    90
slouken@1465
    91
#ifdef _WIN32_WCE
slouken@1895
    92
    {
slouken@1895
    93
        size_t size = SDL_strlen(filename) + 1;
slouken@1895
    94
        wchar_t *filenameW = SDL_stack_alloc(wchar_t, size);
slouken@1465
    95
slouken@1895
    96
        if (MultiByteToWideChar(CP_UTF8, 0, filename, -1, filenameW, size) ==
slouken@1895
    97
            0) {
icculus@2165
    98
            SDL_stack_free(filenameW);
icculus@2165
    99
            SDL_free(context->hidden.win32io.buffer.data);
icculus@2165
   100
            context->hidden.win32io.buffer.data = NULL;
slouken@1895
   101
            SDL_SetError("Unable to convert filename to Unicode");
slouken@1895
   102
            return -1;
slouken@1895
   103
        }
slouken@1895
   104
        h = CreateFile(filenameW, (w_right | r_right),
slouken@1895
   105
                       (w_right) ? 0 : FILE_SHARE_READ, NULL,
slouken@1895
   106
                       (must_exist | truncate | a_mode),
slouken@1895
   107
                       FILE_ATTRIBUTE_NORMAL, NULL);
slouken@1895
   108
        SDL_stack_free(filenameW);
slouken@1895
   109
    }
slouken@1465
   110
#else
slouken@1895
   111
    /* Do not open a dialog box if failure */
slouken@1895
   112
    old_error_mode =
slouken@1895
   113
        SetErrorMode(SEM_NOOPENFILEERRORBOX | SEM_FAILCRITICALERRORS);
slouken@1465
   114
slouken@1895
   115
    h = CreateFile(filename, (w_right | r_right),
slouken@1895
   116
                   (w_right) ? 0 : FILE_SHARE_READ, NULL,
slouken@1895
   117
                   (must_exist | truncate | a_mode), FILE_ATTRIBUTE_NORMAL,
slouken@1895
   118
                   NULL);
slouken@1465
   119
slouken@1895
   120
    /* restore old behaviour */
slouken@1895
   121
    SetErrorMode(old_error_mode);
slouken@1465
   122
#endif /* _WIN32_WCE */
slouken@1446
   123
slouken@1895
   124
    if (h == INVALID_HANDLE_VALUE) {
icculus@2165
   125
        SDL_free(context->hidden.win32io.buffer.data);
icculus@2165
   126
        context->hidden.win32io.buffer.data = NULL;
slouken@1895
   127
        SDL_SetError("Couldn't open %s", filename);
slouken@1895
   128
        return -2;              /* failed (CreateFile) */
slouken@1895
   129
    }
slouken@1895
   130
    context->hidden.win32io.h = h;
slouken@2161
   131
    context->hidden.win32io.append = a_mode ? SDL_TRUE : SDL_FALSE;
slouken@1895
   132
slouken@1895
   133
    return 0;                   /* ok */
slouken@1446
   134
}
slouken@2160
   135
static long SDLCALL
slouken@2160
   136
win32_file_seek(SDL_RWops * context, long offset, int whence)
slouken@1465
   137
{
slouken@1895
   138
    DWORD win32whence;
slouken@2160
   139
    long file_pos;
slouken@1446
   140
slouken@1895
   141
    if (!context || context->hidden.win32io.h == INVALID_HANDLE_VALUE) {
slouken@1895
   142
        SDL_SetError("win32_file_seek: invalid context/file not opened");
slouken@1895
   143
        return -1;
slouken@1895
   144
    }
slouken@1895
   145
slouken@2159
   146
    /* FIXME: We may be able to satisfy the seek within buffered data */
slouken@2159
   147
    if (whence == RW_SEEK_CUR && context->hidden.win32io.buffer.left) {
slouken@2159
   148
        offset -= context->hidden.win32io.buffer.left;
slouken@2159
   149
    }
slouken@2159
   150
    context->hidden.win32io.buffer.left = 0;
slouken@2159
   151
slouken@1895
   152
    switch (whence) {
slouken@1895
   153
    case RW_SEEK_SET:
slouken@1895
   154
        win32whence = FILE_BEGIN;
slouken@1895
   155
        break;
slouken@1895
   156
    case RW_SEEK_CUR:
slouken@1895
   157
        win32whence = FILE_CURRENT;
slouken@1895
   158
        break;
slouken@1895
   159
    case RW_SEEK_END:
slouken@1895
   160
        win32whence = FILE_END;
slouken@1895
   161
        break;
slouken@1895
   162
    default:
slouken@1895
   163
        SDL_SetError("win32_file_seek: Unknown value for 'whence'");
slouken@1895
   164
        return -1;
slouken@1895
   165
    }
slouken@1895
   166
slouken@1895
   167
    file_pos =
slouken@1895
   168
        SetFilePointer(context->hidden.win32io.h, offset, NULL, win32whence);
slouken@1895
   169
slouken@1895
   170
    if (file_pos != INVALID_SET_FILE_POINTER)
slouken@1895
   171
        return file_pos;        /* success */
slouken@1895
   172
slouken@1895
   173
    SDL_Error(SDL_EFSEEK);
slouken@1895
   174
    return -1;                  /* error */
slouken@1446
   175
}
slouken@2160
   176
static size_t SDLCALL
slouken@2160
   177
win32_file_read(SDL_RWops * context, void *ptr, size_t size, size_t maxnum)
slouken@1465
   178
{
slouken@2160
   179
    size_t total_need;
slouken@2160
   180
    size_t total_read = 0;
slouken@2160
   181
    size_t read_ahead;
slouken@2159
   182
    DWORD byte_read;
slouken@1895
   183
slouken@2159
   184
    total_need = size * maxnum;
slouken@1895
   185
slouken@1895
   186
    if (!context || context->hidden.win32io.h == INVALID_HANDLE_VALUE
slouken@2160
   187
        || !total_need)
slouken@1895
   188
        return 0;
slouken@1895
   189
slouken@2159
   190
    if (context->hidden.win32io.buffer.left > 0) {
slouken@2159
   191
        void *data = (char *) context->hidden.win32io.buffer.data +
slouken@2159
   192
            context->hidden.win32io.buffer.size -
slouken@2159
   193
            context->hidden.win32io.buffer.left;
slouken@2159
   194
        read_ahead = SDL_min(total_need, context->hidden.win32io.buffer.left);
slouken@2159
   195
        SDL_memcpy(ptr, data, read_ahead);
slouken@2159
   196
        context->hidden.win32io.buffer.left -= read_ahead;
slouken@2159
   197
slouken@2159
   198
        if (read_ahead == total_need) {
slouken@2159
   199
            return maxnum;
slouken@2159
   200
        }
slouken@2159
   201
        ptr = (char *) ptr + read_ahead;
slouken@2159
   202
        total_need -= read_ahead;
slouken@2159
   203
        total_read += read_ahead;
slouken@1895
   204
    }
slouken@2159
   205
slouken@2159
   206
    if (total_need < READAHEAD_BUFFER_SIZE) {
slouken@2159
   207
        if (!ReadFile
slouken@2159
   208
            (context->hidden.win32io.h, context->hidden.win32io.buffer.data,
slouken@2159
   209
             READAHEAD_BUFFER_SIZE, &byte_read, NULL)) {
slouken@2159
   210
            SDL_Error(SDL_EFREAD);
slouken@2159
   211
            return 0;
slouken@2159
   212
        }
slouken@2159
   213
        read_ahead = SDL_min(total_need, (int) byte_read);
slouken@2159
   214
        SDL_memcpy(ptr, context->hidden.win32io.buffer.data, read_ahead);
slouken@2159
   215
        context->hidden.win32io.buffer.size = byte_read;
slouken@2159
   216
        context->hidden.win32io.buffer.left = byte_read - read_ahead;
slouken@2159
   217
        total_read += read_ahead;
slouken@2159
   218
    } else {
slouken@2159
   219
        if (!ReadFile
slouken@2159
   220
            (context->hidden.win32io.h, ptr, total_need, &byte_read, NULL)) {
slouken@2159
   221
            SDL_Error(SDL_EFREAD);
slouken@2159
   222
            return 0;
slouken@2159
   223
        }
slouken@2159
   224
        total_read += byte_read;
slouken@2159
   225
    }
slouken@2159
   226
    return (total_read / size);
slouken@1446
   227
}
slouken@2160
   228
static size_t SDLCALL
slouken@2160
   229
win32_file_write(SDL_RWops * context, const void *ptr, size_t size,
slouken@2160
   230
                 size_t num)
slouken@1465
   231
{
slouken@1446
   232
slouken@2160
   233
    size_t total_bytes;
slouken@1895
   234
    DWORD byte_written, nwritten;
slouken@1446
   235
slouken@1895
   236
    total_bytes = size * num;
slouken@1895
   237
slouken@1895
   238
    if (!context || context->hidden.win32io.h == INVALID_HANDLE_VALUE
slouken@1895
   239
        || total_bytes <= 0 || !size)
slouken@1895
   240
        return 0;
slouken@1895
   241
slouken@2159
   242
    if (context->hidden.win32io.buffer.left) {
slouken@2159
   243
        SetFilePointer(context->hidden.win32io.h,
slouken@2159
   244
                       -context->hidden.win32io.buffer.left, NULL,
slouken@2159
   245
                       FILE_CURRENT);
slouken@2159
   246
        context->hidden.win32io.buffer.left = 0;
slouken@2159
   247
    }
slouken@2159
   248
slouken@1895
   249
    /* if in append mode, we must go to the EOF before write */
slouken@1895
   250
    if (context->hidden.win32io.append) {
slouken@2159
   251
        if (SetFilePointer(context->hidden.win32io.h, 0L, NULL, FILE_END) ==
slouken@2159
   252
            INVALID_SET_FILE_POINTER) {
slouken@1895
   253
            SDL_Error(SDL_EFWRITE);
slouken@1895
   254
            return 0;
slouken@1895
   255
        }
slouken@1895
   256
    }
slouken@1895
   257
slouken@1895
   258
    if (!WriteFile
slouken@1895
   259
        (context->hidden.win32io.h, ptr, total_bytes, &byte_written, NULL)) {
slouken@1895
   260
        SDL_Error(SDL_EFWRITE);
slouken@1895
   261
        return 0;
slouken@1895
   262
    }
slouken@1895
   263
slouken@1895
   264
    nwritten = byte_written / size;
slouken@1895
   265
    return nwritten;
slouken@1446
   266
}
slouken@1895
   267
static int SDLCALL
slouken@1895
   268
win32_file_close(SDL_RWops * context)
slouken@1465
   269
{
slouken@1895
   270
slouken@1895
   271
    if (context) {
slouken@1895
   272
        if (context->hidden.win32io.h != INVALID_HANDLE_VALUE) {
slouken@1895
   273
            CloseHandle(context->hidden.win32io.h);
slouken@1895
   274
            context->hidden.win32io.h = INVALID_HANDLE_VALUE;   /* to be sure */
slouken@1895
   275
        }
slouken@2159
   276
        if (context->hidden.win32io.buffer.data) {
slouken@2159
   277
            SDL_free(context->hidden.win32io.buffer.data);
slouken@2159
   278
            context->hidden.win32io.buffer.data = NULL;
slouken@2159
   279
        }
slouken@1895
   280
        SDL_FreeRW(context);
slouken@1895
   281
    }
slouken@1895
   282
    return (0);
slouken@1446
   283
}
slouken@1447
   284
#endif /* __WIN32__ */
slouken@1446
   285
slouken@1447
   286
#ifdef HAVE_STDIO_H
slouken@1446
   287
slouken@1447
   288
/* Functions to read/write stdio file pointers */
slouken@1446
   289
slouken@2160
   290
static long SDLCALL
slouken@2160
   291
stdio_seek(SDL_RWops * context, long offset, int whence)
slouken@1447
   292
{
slouken@1895
   293
    if (fseek(context->hidden.stdio.fp, offset, whence) == 0) {
slouken@1895
   294
        return (ftell(context->hidden.stdio.fp));
slouken@1895
   295
    } else {
slouken@1895
   296
        SDL_Error(SDL_EFSEEK);
slouken@1895
   297
        return (-1);
slouken@1895
   298
    }
slouken@1447
   299
}
slouken@2160
   300
static size_t SDLCALL
slouken@2160
   301
stdio_read(SDL_RWops * context, void *ptr, size_t size, size_t maxnum)
slouken@1447
   302
{
slouken@1895
   303
    size_t nread;
slouken@1447
   304
slouken@1895
   305
    nread = fread(ptr, size, maxnum, context->hidden.stdio.fp);
slouken@1895
   306
    if (nread == 0 && ferror(context->hidden.stdio.fp)) {
slouken@1895
   307
        SDL_Error(SDL_EFREAD);
slouken@1895
   308
    }
slouken@1895
   309
    return (nread);
slouken@1447
   310
}
slouken@2160
   311
static size_t SDLCALL
slouken@2160
   312
stdio_write(SDL_RWops * context, const void *ptr, size_t size, size_t num)
slouken@1447
   313
{
slouken@1895
   314
    size_t nwrote;
slouken@1447
   315
slouken@1895
   316
    nwrote = fwrite(ptr, size, num, context->hidden.stdio.fp);
slouken@1895
   317
    if (nwrote == 0 && ferror(context->hidden.stdio.fp)) {
slouken@1895
   318
        SDL_Error(SDL_EFWRITE);
slouken@1895
   319
    }
slouken@1895
   320
    return (nwrote);
slouken@1447
   321
}
slouken@1895
   322
static int SDLCALL
slouken@1895
   323
stdio_close(SDL_RWops * context)
slouken@1447
   324
{
slouken@2160
   325
    int status = 0;
slouken@1895
   326
    if (context) {
slouken@1895
   327
        if (context->hidden.stdio.autoclose) {
slouken@1895
   328
            /* WARNING:  Check the return value here! */
slouken@2160
   329
            if (fclose(context->hidden.stdio.fp) != 0) {
slouken@2160
   330
                SDL_Error(SDL_EFWRITE);
slouken@2160
   331
                status = -1;
slouken@2160
   332
            }
slouken@1895
   333
        }
slouken@1895
   334
        SDL_FreeRW(context);
slouken@1895
   335
    }
slouken@2160
   336
    return status;
slouken@1447
   337
}
slouken@1446
   338
#endif /* !HAVE_STDIO_H */
slouken@1330
   339
slouken@0
   340
/* Functions to read/write memory pointers */
slouken@0
   341
slouken@2160
   342
static long SDLCALL
slouken@2160
   343
mem_seek(SDL_RWops * context, long offset, int whence)
slouken@0
   344
{
slouken@1895
   345
    Uint8 *newpos;
slouken@0
   346
slouken@1895
   347
    switch (whence) {
slouken@1895
   348
    case RW_SEEK_SET:
slouken@1895
   349
        newpos = context->hidden.mem.base + offset;
slouken@1895
   350
        break;
slouken@1895
   351
    case RW_SEEK_CUR:
slouken@1895
   352
        newpos = context->hidden.mem.here + offset;
slouken@1895
   353
        break;
slouken@1895
   354
    case RW_SEEK_END:
slouken@1895
   355
        newpos = context->hidden.mem.stop + offset;
slouken@1895
   356
        break;
slouken@1895
   357
    default:
slouken@1895
   358
        SDL_SetError("Unknown value for 'whence'");
slouken@1895
   359
        return (-1);
slouken@1895
   360
    }
slouken@1895
   361
    if (newpos < context->hidden.mem.base) {
slouken@1895
   362
        newpos = context->hidden.mem.base;
slouken@1895
   363
    }
slouken@1895
   364
    if (newpos > context->hidden.mem.stop) {
slouken@1895
   365
        newpos = context->hidden.mem.stop;
slouken@1895
   366
    }
slouken@1895
   367
    context->hidden.mem.here = newpos;
slouken@1895
   368
    return (context->hidden.mem.here - context->hidden.mem.base);
slouken@0
   369
}
slouken@2160
   370
static size_t SDLCALL
slouken@2160
   371
mem_read(SDL_RWops * context, void *ptr, size_t size, size_t maxnum)
slouken@0
   372
{
slouken@1895
   373
    size_t total_bytes;
slouken@1895
   374
    size_t mem_available;
slouken@0
   375
slouken@1895
   376
    total_bytes = (maxnum * size);
slouken@1895
   377
    if ((maxnum <= 0) || (size <= 0)
slouken@1895
   378
        || ((total_bytes / maxnum) != (size_t) size)) {
slouken@1895
   379
        return 0;
slouken@1895
   380
    }
icculus@1078
   381
slouken@1895
   382
    mem_available = (context->hidden.mem.stop - context->hidden.mem.here);
slouken@1895
   383
    if (total_bytes > mem_available) {
slouken@1895
   384
        total_bytes = mem_available;
slouken@1895
   385
    }
icculus@1078
   386
slouken@1895
   387
    SDL_memcpy(ptr, context->hidden.mem.here, total_bytes);
slouken@1895
   388
    context->hidden.mem.here += total_bytes;
icculus@1078
   389
slouken@1895
   390
    return (total_bytes / size);
slouken@0
   391
}
slouken@2160
   392
static size_t SDLCALL
slouken@2160
   393
mem_write(SDL_RWops * context, const void *ptr, size_t size, size_t num)
slouken@0
   394
{
slouken@1895
   395
    if ((context->hidden.mem.here + (num * size)) > context->hidden.mem.stop) {
slouken@1895
   396
        num = (context->hidden.mem.stop - context->hidden.mem.here) / size;
slouken@1895
   397
    }
slouken@1895
   398
    SDL_memcpy(context->hidden.mem.here, ptr, num * size);
slouken@1895
   399
    context->hidden.mem.here += num * size;
slouken@1895
   400
    return (num);
slouken@0
   401
}
slouken@2160
   402
static size_t SDLCALL
slouken@2160
   403
mem_writeconst(SDL_RWops * context, const void *ptr, size_t size, size_t num)
slouken@764
   404
{
slouken@1895
   405
    SDL_SetError("Can't write to read-only memory");
slouken@1895
   406
    return (-1);
slouken@764
   407
}
slouken@1895
   408
static int SDLCALL
slouken@1895
   409
mem_close(SDL_RWops * context)
slouken@0
   410
{
slouken@1895
   411
    if (context) {
slouken@1895
   412
        SDL_FreeRW(context);
slouken@1895
   413
    }
slouken@1895
   414
    return (0);
slouken@0
   415
}
slouken@0
   416
slouken@1447
   417
slouken@0
   418
/* Functions to create SDL_RWops structures from various data sources */
slouken@0
   419
slouken@1895
   420
SDL_RWops *
slouken@1895
   421
SDL_RWFromFile(const char *file, const char *mode)
slouken@0
   422
{
slouken@1895
   423
    SDL_RWops *rwops = NULL;
slouken@1465
   424
#ifdef HAVE_STDIO_H
slouken@1895
   425
    FILE *fp = NULL;
slouken@1465
   426
#endif
slouken@1895
   427
    if (!file || !*file || !mode || !*mode) {
slouken@1895
   428
        SDL_SetError("SDL_RWFromFile(): No file or no mode specified");
slouken@1895
   429
        return NULL;
slouken@1895
   430
    }
slouken@1465
   431
#if defined(__WIN32__)
slouken@1895
   432
    rwops = SDL_AllocRW();
slouken@1895
   433
    if (!rwops)
slouken@1895
   434
        return NULL;            /* SDL_SetError already setup by SDL_AllocRW() */
slouken@2164
   435
    if (win32_file_open(rwops, file, mode) < 0) {
slouken@1895
   436
        SDL_FreeRW(rwops);
slouken@1895
   437
        return NULL;
slouken@1895
   438
    }
slouken@1895
   439
    rwops->seek = win32_file_seek;
slouken@1895
   440
    rwops->read = win32_file_read;
slouken@1895
   441
    rwops->write = win32_file_write;
slouken@1895
   442
    rwops->close = win32_file_close;
slouken@1447
   443
slouken@1447
   444
#elif HAVE_STDIO_H
slouken@0
   445
slouken@1895
   446
    fp = fopen(file, mode);
slouken@1895
   447
    if (fp == NULL) {
slouken@1895
   448
        SDL_SetError("Couldn't open %s", file);
slouken@1895
   449
    } else {
slouken@1895
   450
        rwops = SDL_RWFromFP(fp, 1);
slouken@1895
   451
    }
slouken@0
   452
#else
slouken@1895
   453
    SDL_SetError("SDL not compiled with stdio support");
slouken@1446
   454
#endif /* !HAVE_STDIO_H */
slouken@1447
   455
slouken@1895
   456
    return (rwops);
slouken@0
   457
}
slouken@0
   458
slouken@1330
   459
#ifdef HAVE_STDIO_H
slouken@1895
   460
SDL_RWops *
slouken@2161
   461
SDL_RWFromFP(FILE * fp, SDL_bool autoclose)
slouken@0
   462
{
slouken@1895
   463
    SDL_RWops *rwops = NULL;
slouken@0
   464
slouken@1895
   465
    rwops = SDL_AllocRW();
slouken@1895
   466
    if (rwops != NULL) {
slouken@1895
   467
        rwops->seek = stdio_seek;
slouken@1895
   468
        rwops->read = stdio_read;
slouken@1895
   469
        rwops->write = stdio_write;
slouken@1895
   470
        rwops->close = stdio_close;
slouken@1895
   471
        rwops->hidden.stdio.fp = fp;
slouken@1895
   472
        rwops->hidden.stdio.autoclose = autoclose;
slouken@1895
   473
    }
slouken@1895
   474
    return (rwops);
slouken@0
   475
}
slouken@1330
   476
#endif /* HAVE_STDIO_H */
slouken@0
   477
slouken@1895
   478
SDL_RWops *
slouken@1895
   479
SDL_RWFromMem(void *mem, int size)
slouken@0
   480
{
slouken@1895
   481
    SDL_RWops *rwops;
slouken@0
   482
slouken@1895
   483
    rwops = SDL_AllocRW();
slouken@1895
   484
    if (rwops != NULL) {
slouken@1895
   485
        rwops->seek = mem_seek;
slouken@1895
   486
        rwops->read = mem_read;
slouken@1895
   487
        rwops->write = mem_write;
slouken@1895
   488
        rwops->close = mem_close;
slouken@1895
   489
        rwops->hidden.mem.base = (Uint8 *) mem;
slouken@1895
   490
        rwops->hidden.mem.here = rwops->hidden.mem.base;
slouken@1895
   491
        rwops->hidden.mem.stop = rwops->hidden.mem.base + size;
slouken@1895
   492
    }
slouken@1895
   493
    return (rwops);
slouken@0
   494
}
slouken@0
   495
slouken@1895
   496
SDL_RWops *
slouken@1895
   497
SDL_RWFromConstMem(const void *mem, int size)
slouken@764
   498
{
slouken@1895
   499
    SDL_RWops *rwops;
slouken@764
   500
slouken@1895
   501
    rwops = SDL_AllocRW();
slouken@1895
   502
    if (rwops != NULL) {
slouken@1895
   503
        rwops->seek = mem_seek;
slouken@1895
   504
        rwops->read = mem_read;
slouken@1895
   505
        rwops->write = mem_writeconst;
slouken@1895
   506
        rwops->close = mem_close;
slouken@1895
   507
        rwops->hidden.mem.base = (Uint8 *) mem;
slouken@1895
   508
        rwops->hidden.mem.here = rwops->hidden.mem.base;
slouken@1895
   509
        rwops->hidden.mem.stop = rwops->hidden.mem.base + size;
slouken@1895
   510
    }
slouken@1895
   511
    return (rwops);
slouken@764
   512
}
slouken@764
   513
slouken@1895
   514
SDL_RWops *
slouken@1895
   515
SDL_AllocRW(void)
slouken@0
   516
{
slouken@1895
   517
    SDL_RWops *area;
slouken@0
   518
slouken@1895
   519
    area = (SDL_RWops *) SDL_malloc(sizeof *area);
slouken@1895
   520
    if (area == NULL) {
slouken@1895
   521
        SDL_OutOfMemory();
slouken@1895
   522
    }
slouken@1895
   523
    return (area);
slouken@0
   524
}
slouken@0
   525
slouken@1895
   526
void
slouken@1895
   527
SDL_FreeRW(SDL_RWops * area)
slouken@0
   528
{
slouken@1895
   529
    SDL_free(area);
slouken@0
   530
}
slouken@1354
   531
slouken@1354
   532
/* Functions for dynamically reading and writing endian-specific values */
slouken@1354
   533
slouken@1895
   534
Uint16
slouken@1895
   535
SDL_ReadLE16(SDL_RWops * src)
slouken@1354
   536
{
slouken@1895
   537
    Uint16 value;
slouken@1354
   538
slouken@1895
   539
    SDL_RWread(src, &value, (sizeof value), 1);
slouken@1895
   540
    return (SDL_SwapLE16(value));
slouken@1354
   541
}
slouken@1354
   542
slouken@1895
   543
Uint16
slouken@1895
   544
SDL_ReadBE16(SDL_RWops * src)
slouken@1354
   545
{
slouken@1895
   546
    Uint16 value;
slouken@1895
   547
slouken@1895
   548
    SDL_RWread(src, &value, (sizeof value), 1);
slouken@1895
   549
    return (SDL_SwapBE16(value));
slouken@1354
   550
}
slouken@1895
   551
slouken@1895
   552
Uint32
slouken@1895
   553
SDL_ReadLE32(SDL_RWops * src)
slouken@1354
   554
{
slouken@1895
   555
    Uint32 value;
slouken@1895
   556
slouken@1895
   557
    SDL_RWread(src, &value, (sizeof value), 1);
slouken@1895
   558
    return (SDL_SwapLE32(value));
slouken@1354
   559
}
slouken@1895
   560
slouken@1895
   561
Uint32
slouken@1895
   562
SDL_ReadBE32(SDL_RWops * src)
slouken@1354
   563
{
slouken@1895
   564
    Uint32 value;
slouken@1895
   565
slouken@1895
   566
    SDL_RWread(src, &value, (sizeof value), 1);
slouken@1895
   567
    return (SDL_SwapBE32(value));
slouken@1354
   568
}
slouken@1895
   569
slouken@1895
   570
Uint64
slouken@1895
   571
SDL_ReadLE64(SDL_RWops * src)
slouken@1354
   572
{
slouken@1895
   573
    Uint64 value;
slouken@1895
   574
slouken@1895
   575
    SDL_RWread(src, &value, (sizeof value), 1);
slouken@1895
   576
    return (SDL_SwapLE64(value));
slouken@1354
   577
}
slouken@1895
   578
slouken@1895
   579
Uint64
slouken@1895
   580
SDL_ReadBE64(SDL_RWops * src)
slouken@1354
   581
{
slouken@1895
   582
    Uint64 value;
slouken@1895
   583
slouken@1895
   584
    SDL_RWread(src, &value, (sizeof value), 1);
slouken@1895
   585
    return (SDL_SwapBE64(value));
slouken@1354
   586
}
slouken@1895
   587
slouken@1895
   588
int
slouken@1895
   589
SDL_WriteLE16(SDL_RWops * dst, Uint16 value)
slouken@1354
   590
{
slouken@1895
   591
    value = SDL_SwapLE16(value);
slouken@1895
   592
    return (SDL_RWwrite(dst, &value, (sizeof value), 1));
slouken@1354
   593
}
slouken@1895
   594
slouken@1895
   595
int
slouken@1895
   596
SDL_WriteBE16(SDL_RWops * dst, Uint16 value)
slouken@1895
   597
{
slouken@1895
   598
    value = SDL_SwapBE16(value);
slouken@1895
   599
    return (SDL_RWwrite(dst, &value, (sizeof value), 1));
slouken@1895
   600
}
slouken@1895
   601
slouken@1895
   602
int
slouken@1895
   603
SDL_WriteLE32(SDL_RWops * dst, Uint32 value)
slouken@1895
   604
{
slouken@1895
   605
    value = SDL_SwapLE32(value);
slouken@1895
   606
    return (SDL_RWwrite(dst, &value, (sizeof value), 1));
slouken@1895
   607
}
slouken@1895
   608
slouken@1895
   609
int
slouken@1895
   610
SDL_WriteBE32(SDL_RWops * dst, Uint32 value)
slouken@1895
   611
{
slouken@1895
   612
    value = SDL_SwapBE32(value);
slouken@1895
   613
    return (SDL_RWwrite(dst, &value, (sizeof value), 1));
slouken@1895
   614
}
slouken@1895
   615
slouken@1895
   616
int
slouken@1895
   617
SDL_WriteLE64(SDL_RWops * dst, Uint64 value)
slouken@1895
   618
{
slouken@1895
   619
    value = SDL_SwapLE64(value);
slouken@1895
   620
    return (SDL_RWwrite(dst, &value, (sizeof value), 1));
slouken@1895
   621
}
slouken@1895
   622
slouken@1895
   623
int
slouken@1895
   624
SDL_WriteBE64(SDL_RWops * dst, Uint64 value)
slouken@1895
   625
{
slouken@1895
   626
    value = SDL_SwapBE64(value);
slouken@1895
   627
    return (SDL_RWwrite(dst, &value, (sizeof value), 1));
slouken@1895
   628
}
slouken@1895
   629
slouken@1895
   630
/* vi: set ts=4 sw=4 expandtab: */