src/file/SDL_rwops.c
author Sam Lantinga <slouken@libsdl.org>
Sat, 18 May 2013 14:17:52 -0700
changeset 7191 75360622e65f
parent 7070 65df21723f58
child 7262 3c5f6170df8e
permissions -rw-r--r--
File style cleanup for the SDL 2.0 release
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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/* Need this so Linux systems define fseek64o, ftell64o and off64_t */
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#define _LARGEFILE64_SOURCE
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#include "SDL_config.h"
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/* This file provides a general interface for SDL to read and write
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   data sources.  It can easily be extended to files, memory, etc.
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*/
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#include "SDL_endian.h"
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#include "SDL_rwops.h"
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#ifdef __APPLE__
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#include "cocoa/SDL_rwopsbundlesupport.h"
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#endif /* __APPLE__ */
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#ifdef ANDROID
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#include "../core/android/SDL_android.h"
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#endif
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#ifdef __WIN32__
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/* Functions to read/write Win32 API file pointers */
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#include "../core/windows/SDL_windows.h"
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#ifndef INVALID_SET_FILE_POINTER
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#define INVALID_SET_FILE_POINTER 0xFFFFFFFF
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#endif
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#define READAHEAD_BUFFER_SIZE   1024
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static int SDLCALL
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windows_file_open(SDL_RWops * context, const char *filename, const char *mode)
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{
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    UINT old_error_mode;
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    HANDLE h;
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    DWORD r_right, w_right;
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    DWORD must_exist, truncate;
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    int a_mode;
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    if (!context)
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        return -1;              /* failed (invalid call) */
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    context->hidden.windowsio.h = INVALID_HANDLE_VALUE;   /* mark this as unusable */
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    context->hidden.windowsio.buffer.data = NULL;
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    context->hidden.windowsio.buffer.size = 0;
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    context->hidden.windowsio.buffer.left = 0;
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    /* "r" = reading, file must exist */
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    /* "w" = writing, truncate existing, file may not exist */
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    /* "r+"= reading or writing, file must exist            */
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    /* "a" = writing, append file may not exist             */
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    /* "a+"= append + read, file may not exist              */
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    /* "w+" = read, write, truncate. file may not exist    */
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    must_exist = (SDL_strchr(mode, 'r') != NULL) ? OPEN_EXISTING : 0;
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    truncate = (SDL_strchr(mode, 'w') != NULL) ? CREATE_ALWAYS : 0;
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    r_right = (SDL_strchr(mode, '+') != NULL
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               || must_exist) ? GENERIC_READ : 0;
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    a_mode = (SDL_strchr(mode, 'a') != NULL) ? OPEN_ALWAYS : 0;
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    w_right = (a_mode || SDL_strchr(mode, '+')
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               || truncate) ? GENERIC_WRITE : 0;
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    if (!r_right && !w_right)   /* inconsistent mode */
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        return -1;              /* failed (invalid call) */
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    context->hidden.windowsio.buffer.data =
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        (char *) SDL_malloc(READAHEAD_BUFFER_SIZE);
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    if (!context->hidden.windowsio.buffer.data) {
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        return SDL_OutOfMemory();
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    }
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    /* Do not open a dialog box if failure */
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    old_error_mode =
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        SetErrorMode(SEM_NOOPENFILEERRORBOX | SEM_FAILCRITICALERRORS);
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    {
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        LPTSTR tstr = WIN_UTF8ToString(filename);
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        h = CreateFile(tstr, (w_right | r_right),
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                       (w_right) ? 0 : FILE_SHARE_READ, NULL,
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                       (must_exist | truncate | a_mode),
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                       FILE_ATTRIBUTE_NORMAL, NULL);
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        SDL_free(tstr);
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    }
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    /* restore old behavior */
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    SetErrorMode(old_error_mode);
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    if (h == INVALID_HANDLE_VALUE) {
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        SDL_free(context->hidden.windowsio.buffer.data);
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        context->hidden.windowsio.buffer.data = NULL;
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        SDL_SetError("Couldn't open %s", filename);
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        return -2;              /* failed (CreateFile) */
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    }
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    context->hidden.windowsio.h = h;
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    context->hidden.windowsio.append = a_mode ? SDL_TRUE : SDL_FALSE;
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    return 0;                   /* ok */
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}
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static Sint64 SDLCALL
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windows_file_size(SDL_RWops * context)
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{
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    LARGE_INTEGER size;
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    if (!context || context->hidden.windowsio.h == INVALID_HANDLE_VALUE) {
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        return SDL_SetError("windows_file_size: invalid context/file not opened");
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    }
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    if (!GetFileSizeEx(context->hidden.windowsio.h, &size)) {
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        return WIN_SetError("windows_file_size");
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    }
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    return size.QuadPart;
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}
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static Sint64 SDLCALL
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windows_file_seek(SDL_RWops * context, Sint64 offset, int whence)
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{
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    DWORD windowswhence;
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    LARGE_INTEGER windowsoffset;
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    if (!context || context->hidden.windowsio.h == INVALID_HANDLE_VALUE) {
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        return SDL_SetError("windows_file_seek: invalid context/file not opened");
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    }
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    /* FIXME: We may be able to satisfy the seek within buffered data */
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    if (whence == RW_SEEK_CUR && context->hidden.windowsio.buffer.left) {
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        offset -= (long)context->hidden.windowsio.buffer.left;
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    }
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    context->hidden.windowsio.buffer.left = 0;
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    switch (whence) {
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    case RW_SEEK_SET:
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        windowswhence = FILE_BEGIN;
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        break;
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    case RW_SEEK_CUR:
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        windowswhence = FILE_CURRENT;
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        break;
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    case RW_SEEK_END:
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        windowswhence = FILE_END;
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        break;
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    default:
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        return SDL_SetError("windows_file_seek: Unknown value for 'whence'");
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    }
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    windowsoffset.QuadPart = offset;
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    if (!SetFilePointerEx(context->hidden.windowsio.h, windowsoffset, &windowsoffset, windowswhence)) {
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        return WIN_SetError("windows_file_seek");
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    }
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    return windowsoffset.QuadPart;
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}
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static size_t SDLCALL
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windows_file_read(SDL_RWops * context, void *ptr, size_t size, size_t maxnum)
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{
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    size_t total_need;
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    size_t total_read = 0;
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    size_t read_ahead;
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    DWORD byte_read;
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    total_need = size * maxnum;
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    if (!context || context->hidden.windowsio.h == INVALID_HANDLE_VALUE
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        || !total_need)
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        return 0;
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    if (context->hidden.windowsio.buffer.left > 0) {
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        void *data = (char *) context->hidden.windowsio.buffer.data +
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            context->hidden.windowsio.buffer.size -
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            context->hidden.windowsio.buffer.left;
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        read_ahead =
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            SDL_min(total_need, context->hidden.windowsio.buffer.left);
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        SDL_memcpy(ptr, data, read_ahead);
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        context->hidden.windowsio.buffer.left -= read_ahead;
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        if (read_ahead == total_need) {
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            return maxnum;
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        }
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        ptr = (char *) ptr + read_ahead;
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        total_need -= read_ahead;
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        total_read += read_ahead;
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    }
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    if (total_need < READAHEAD_BUFFER_SIZE) {
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        if (!ReadFile
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            (context->hidden.windowsio.h, context->hidden.windowsio.buffer.data,
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             READAHEAD_BUFFER_SIZE, &byte_read, NULL)) {
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            SDL_Error(SDL_EFREAD);
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            return 0;
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        }
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        read_ahead = SDL_min(total_need, (int) byte_read);
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        SDL_memcpy(ptr, context->hidden.windowsio.buffer.data, read_ahead);
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        context->hidden.windowsio.buffer.size = byte_read;
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        context->hidden.windowsio.buffer.left = byte_read - read_ahead;
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        total_read += read_ahead;
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    } else {
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        if (!ReadFile
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            (context->hidden.windowsio.h, ptr, (DWORD)total_need, &byte_read, NULL)) {
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            SDL_Error(SDL_EFREAD);
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            return 0;
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        }
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        total_read += byte_read;
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    }
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    return (total_read / size);
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}
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static size_t SDLCALL
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windows_file_write(SDL_RWops * context, const void *ptr, size_t size,
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                 size_t num)
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{
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    size_t total_bytes;
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    DWORD byte_written;
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    size_t nwritten;
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    total_bytes = size * num;
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    if (!context || context->hidden.windowsio.h == INVALID_HANDLE_VALUE
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        || total_bytes <= 0 || !size)
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        return 0;
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    if (context->hidden.windowsio.buffer.left) {
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        SetFilePointer(context->hidden.windowsio.h,
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                       -(LONG)context->hidden.windowsio.buffer.left, NULL,
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                       FILE_CURRENT);
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        context->hidden.windowsio.buffer.left = 0;
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    }
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    /* if in append mode, we must go to the EOF before write */
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    if (context->hidden.windowsio.append) {
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        if (SetFilePointer(context->hidden.windowsio.h, 0L, NULL, FILE_END) ==
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            INVALID_SET_FILE_POINTER) {
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            SDL_Error(SDL_EFWRITE);
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            return 0;
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        }
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    }
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    if (!WriteFile
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        (context->hidden.windowsio.h, ptr, (DWORD)total_bytes, &byte_written, NULL)) {
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        SDL_Error(SDL_EFWRITE);
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        return 0;
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    }
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    nwritten = byte_written / size;
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    return nwritten;
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}
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static int SDLCALL
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windows_file_close(SDL_RWops * context)
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{
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    if (context) {
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        if (context->hidden.windowsio.h != INVALID_HANDLE_VALUE) {
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            CloseHandle(context->hidden.windowsio.h);
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            context->hidden.windowsio.h = INVALID_HANDLE_VALUE;   /* to be sure */
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        }
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        if (context->hidden.windowsio.buffer.data) {
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            SDL_free(context->hidden.windowsio.buffer.data);
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            context->hidden.windowsio.buffer.data = NULL;
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        }
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        SDL_FreeRW(context);
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    }
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    return (0);
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}
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#endif /* __WIN32__ */
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#ifdef HAVE_STDIO_H
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/* Functions to read/write stdio file pointers */
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static Sint64 SDLCALL
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stdio_size(SDL_RWops * context)
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{
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    Sint64 pos, size;
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    pos = SDL_RWseek(context, 0, RW_SEEK_CUR);
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    if (pos < 0) {
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        return -1;
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    }
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    size = SDL_RWseek(context, 0, RW_SEEK_END);
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    SDL_RWseek(context, pos, RW_SEEK_SET);
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    return size;
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}
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static Sint64 SDLCALL
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stdio_seek(SDL_RWops * context, Sint64 offset, int whence)
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{
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#ifdef HAVE_FSEEKO64
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    if (fseeko64(context->hidden.stdio.fp, (off64_t)offset, whence) == 0) {
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        return ftello64(context->hidden.stdio.fp);
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    }
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#elif defined(HAVE_FSEEKO)
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    if (fseeko(context->hidden.stdio.fp, (off_t)offset, whence) == 0) {
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        return ftello(context->hidden.stdio.fp);
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    }
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#else
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    if (fseek(context->hidden.stdio.fp, offset, whence) == 0) {
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        return (ftell(context->hidden.stdio.fp));
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    }
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#endif
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    return SDL_Error(SDL_EFSEEK);
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}
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static size_t SDLCALL
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stdio_read(SDL_RWops * context, void *ptr, size_t size, size_t maxnum)
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{
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    size_t nread;
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    nread = fread(ptr, size, maxnum, context->hidden.stdio.fp);
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    if (nread == 0 && ferror(context->hidden.stdio.fp)) {
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        SDL_Error(SDL_EFREAD);
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    }
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    return (nread);
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}
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static size_t SDLCALL
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stdio_write(SDL_RWops * context, const void *ptr, size_t size, size_t num)
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{
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    size_t nwrote;
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    nwrote = fwrite(ptr, size, num, context->hidden.stdio.fp);
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    if (nwrote == 0 && ferror(context->hidden.stdio.fp)) {
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        SDL_Error(SDL_EFWRITE);
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    }
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    return (nwrote);
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}
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static int SDLCALL
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stdio_close(SDL_RWops * context)
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{
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    int status = 0;
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    if (context) {
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        if (context->hidden.stdio.autoclose) {
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            /* WARNING:  Check the return value here! */
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            if (fclose(context->hidden.stdio.fp) != 0) {
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                status = SDL_Error(SDL_EFWRITE);
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            }
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        }
slouken@1895
   360
        SDL_FreeRW(context);
slouken@1895
   361
    }
slouken@2160
   362
    return status;
slouken@1447
   363
}
slouken@1446
   364
#endif /* !HAVE_STDIO_H */
slouken@1330
   365
slouken@0
   366
/* Functions to read/write memory pointers */
slouken@0
   367
slouken@6642
   368
static Sint64 SDLCALL
slouken@6642
   369
mem_size(SDL_RWops * context)
slouken@6642
   370
{
slouken@6642
   371
    return (Sint64)(context->hidden.mem.stop - context->hidden.mem.base);
slouken@6642
   372
}
slouken@6642
   373
slouken@6642
   374
static Sint64 SDLCALL
slouken@6642
   375
mem_seek(SDL_RWops * context, Sint64 offset, int whence)
slouken@0
   376
{
slouken@1895
   377
    Uint8 *newpos;
slouken@0
   378
slouken@1895
   379
    switch (whence) {
slouken@1895
   380
    case RW_SEEK_SET:
slouken@1895
   381
        newpos = context->hidden.mem.base + offset;
slouken@1895
   382
        break;
slouken@1895
   383
    case RW_SEEK_CUR:
slouken@1895
   384
        newpos = context->hidden.mem.here + offset;
slouken@1895
   385
        break;
slouken@1895
   386
    case RW_SEEK_END:
slouken@1895
   387
        newpos = context->hidden.mem.stop + offset;
slouken@1895
   388
        break;
slouken@1895
   389
    default:
icculus@7037
   390
        return SDL_SetError("Unknown value for 'whence'");
slouken@1895
   391
    }
slouken@1895
   392
    if (newpos < context->hidden.mem.base) {
slouken@1895
   393
        newpos = context->hidden.mem.base;
slouken@1895
   394
    }
slouken@1895
   395
    if (newpos > context->hidden.mem.stop) {
slouken@1895
   396
        newpos = context->hidden.mem.stop;
slouken@1895
   397
    }
slouken@1895
   398
    context->hidden.mem.here = newpos;
slouken@6642
   399
    return (Sint64)(context->hidden.mem.here - context->hidden.mem.base);
slouken@0
   400
}
slouken@2735
   401
slouken@2160
   402
static size_t SDLCALL
slouken@2160
   403
mem_read(SDL_RWops * context, void *ptr, size_t size, size_t maxnum)
slouken@0
   404
{
slouken@1895
   405
    size_t total_bytes;
slouken@1895
   406
    size_t mem_available;
slouken@0
   407
slouken@1895
   408
    total_bytes = (maxnum * size);
slouken@1895
   409
    if ((maxnum <= 0) || (size <= 0)
slouken@1895
   410
        || ((total_bytes / maxnum) != (size_t) size)) {
slouken@1895
   411
        return 0;
slouken@1895
   412
    }
icculus@1078
   413
slouken@1895
   414
    mem_available = (context->hidden.mem.stop - context->hidden.mem.here);
slouken@1895
   415
    if (total_bytes > mem_available) {
slouken@1895
   416
        total_bytes = mem_available;
slouken@1895
   417
    }
icculus@1078
   418
slouken@1895
   419
    SDL_memcpy(ptr, context->hidden.mem.here, total_bytes);
slouken@1895
   420
    context->hidden.mem.here += total_bytes;
icculus@1078
   421
slouken@1895
   422
    return (total_bytes / size);
slouken@0
   423
}
slouken@2735
   424
slouken@2160
   425
static size_t SDLCALL
slouken@2160
   426
mem_write(SDL_RWops * context, const void *ptr, size_t size, size_t num)
slouken@0
   427
{
slouken@1895
   428
    if ((context->hidden.mem.here + (num * size)) > context->hidden.mem.stop) {
slouken@1895
   429
        num = (context->hidden.mem.stop - context->hidden.mem.here) / size;
slouken@1895
   430
    }
slouken@1895
   431
    SDL_memcpy(context->hidden.mem.here, ptr, num * size);
slouken@1895
   432
    context->hidden.mem.here += num * size;
slouken@1895
   433
    return (num);
slouken@0
   434
}
slouken@2735
   435
slouken@2160
   436
static size_t SDLCALL
slouken@2160
   437
mem_writeconst(SDL_RWops * context, const void *ptr, size_t size, size_t num)
slouken@764
   438
{
slouken@1895
   439
    SDL_SetError("Can't write to read-only memory");
aschiffler@6996
   440
    return (0);
slouken@764
   441
}
slouken@2735
   442
slouken@1895
   443
static int SDLCALL
slouken@1895
   444
mem_close(SDL_RWops * context)
slouken@0
   445
{
slouken@1895
   446
    if (context) {
slouken@1895
   447
        SDL_FreeRW(context);
slouken@1895
   448
    }
slouken@1895
   449
    return (0);
slouken@0
   450
}
slouken@0
   451
slouken@1447
   452
slouken@0
   453
/* Functions to create SDL_RWops structures from various data sources */
slouken@0
   454
slouken@1895
   455
SDL_RWops *
slouken@1895
   456
SDL_RWFromFile(const char *file, const char *mode)
slouken@0
   457
{
slouken@1895
   458
    SDL_RWops *rwops = NULL;
slouken@1895
   459
    if (!file || !*file || !mode || !*mode) {
slouken@1895
   460
        SDL_SetError("SDL_RWFromFile(): No file or no mode specified");
slouken@1895
   461
        return NULL;
slouken@1895
   462
    }
icculus@5582
   463
#if defined(ANDROID)
slouken@6629
   464
#ifdef HAVE_STDIO_H
slouken@6629
   465
    /* Try to open the file on the filesystem first */
slouken@6633
   466
    if (*file == '/') {
slouken@6629
   467
        FILE *fp = fopen(file, mode);
slouken@6629
   468
        if (fp) {
slouken@6629
   469
            return SDL_RWFromFP(fp, 1);
slouken@6629
   470
        }
slouken@6633
   471
    } else {
slouken@6633
   472
        /* Try opening it from internal storage if it's a relative path */
slouken@6633
   473
        char *path;
slouken@6633
   474
        FILE *fp;
slouken@6633
   475
slouken@6633
   476
        path = SDL_stack_alloc(char, PATH_MAX);
slouken@6633
   477
        if (path) {
slouken@6633
   478
            SDL_snprintf(path, PATH_MAX, "%s/%s",
slouken@6633
   479
                         SDL_AndroidGetInternalStoragePath(), file);
slouken@6633
   480
            fp = fopen(path, mode);
slouken@6633
   481
            SDL_stack_free(path);
slouken@6633
   482
            if (fp) {
slouken@6633
   483
                return SDL_RWFromFP(fp, 1);
slouken@6633
   484
            }
slouken@6633
   485
        }
slouken@6629
   486
    }
slouken@6633
   487
#endif /* HAVE_STDIO_H */
slouken@6629
   488
slouken@6629
   489
    /* Try to open the file from the asset system */
icculus@5582
   490
    rwops = SDL_AllocRW();
icculus@5582
   491
    if (!rwops)
icculus@5582
   492
        return NULL;            /* SDL_SetError already setup by SDL_AllocRW() */
icculus@5582
   493
    if (Android_JNI_FileOpen(rwops, file, mode) < 0) {
icculus@5582
   494
        SDL_FreeRW(rwops);
icculus@5582
   495
        return NULL;
icculus@5582
   496
    }
slouken@6642
   497
    rwops->size = Android_JNI_FileSize;
icculus@5582
   498
    rwops->seek = Android_JNI_FileSeek;
icculus@5582
   499
    rwops->read = Android_JNI_FileRead;
icculus@5582
   500
    rwops->write = Android_JNI_FileWrite;
icculus@5582
   501
    rwops->close = Android_JNI_FileClose;
aschiffler@6999
   502
    rwops->type = SDL_RWOPS_JNIFILE;
icculus@5582
   503
icculus@5582
   504
#elif defined(__WIN32__)
slouken@1895
   505
    rwops = SDL_AllocRW();
slouken@1895
   506
    if (!rwops)
slouken@1895
   507
        return NULL;            /* SDL_SetError already setup by SDL_AllocRW() */
slouken@5062
   508
    if (windows_file_open(rwops, file, mode) < 0) {
slouken@1895
   509
        SDL_FreeRW(rwops);
slouken@1895
   510
        return NULL;
slouken@1895
   511
    }
slouken@6642
   512
    rwops->size = windows_file_size;
slouken@5062
   513
    rwops->seek = windows_file_seek;
slouken@5062
   514
    rwops->read = windows_file_read;
slouken@5062
   515
    rwops->write = windows_file_write;
slouken@5062
   516
    rwops->close = windows_file_close;
aschiffler@6999
   517
    rwops->type = SDL_RWOPS_WINFILE;
slouken@1447
   518
slouken@1447
   519
#elif HAVE_STDIO_H
icculus@6375
   520
    {
slouken@7191
   521
        #ifdef __APPLE__
slouken@7191
   522
        FILE *fp = SDL_OpenFPFromBundleOrFallback(file, mode);
icculus@6375
   523
        #else
slouken@7191
   524
        FILE *fp = fopen(file, mode);
slouken@7191
   525
        #endif
slouken@7191
   526
        if (fp == NULL) {
icculus@6375
   527
            SDL_SetError("Couldn't open %s", file);
icculus@6375
   528
        } else {
icculus@6375
   529
            rwops = SDL_RWFromFP(fp, 1);
icculus@6375
   530
        }
slouken@1895
   531
    }
slouken@0
   532
#else
slouken@1895
   533
    SDL_SetError("SDL not compiled with stdio support");
slouken@1446
   534
#endif /* !HAVE_STDIO_H */
slouken@1447
   535
slouken@1895
   536
    return (rwops);
slouken@0
   537
}
slouken@0
   538
slouken@1330
   539
#ifdef HAVE_STDIO_H
slouken@1895
   540
SDL_RWops *
slouken@2161
   541
SDL_RWFromFP(FILE * fp, SDL_bool autoclose)
slouken@0
   542
{
slouken@1895
   543
    SDL_RWops *rwops = NULL;
slouken@0
   544
slouken@1895
   545
    rwops = SDL_AllocRW();
slouken@1895
   546
    if (rwops != NULL) {
slouken@6642
   547
        rwops->size = stdio_size;
slouken@1895
   548
        rwops->seek = stdio_seek;
slouken@1895
   549
        rwops->read = stdio_read;
slouken@1895
   550
        rwops->write = stdio_write;
slouken@1895
   551
        rwops->close = stdio_close;
slouken@1895
   552
        rwops->hidden.stdio.fp = fp;
slouken@1895
   553
        rwops->hidden.stdio.autoclose = autoclose;
aschiffler@6999
   554
        rwops->type = SDL_RWOPS_STDFILE;
slouken@1895
   555
    }
slouken@1895
   556
    return (rwops);
slouken@0
   557
}
slouken@3564
   558
#else
slouken@3564
   559
SDL_RWops *
slouken@3564
   560
SDL_RWFromFP(void * fp, SDL_bool autoclose)
slouken@3564
   561
{
slouken@3564
   562
    SDL_SetError("SDL not compiled with stdio support");
slouken@3564
   563
    return NULL;
slouken@3564
   564
}
slouken@1330
   565
#endif /* HAVE_STDIO_H */
slouken@0
   566
slouken@1895
   567
SDL_RWops *
slouken@1895
   568
SDL_RWFromMem(void *mem, int size)
slouken@0
   569
{
aschiffler@6999
   570
    SDL_RWops *rwops = NULL;
aschiffler@6999
   571
    if (!mem) {
aschiffler@6999
   572
      SDL_InvalidParamError("mem");
aschiffler@6999
   573
      return (rwops);
aschiffler@6999
   574
    }
aschiffler@6999
   575
    if (!size) {
aschiffler@6999
   576
      SDL_InvalidParamError("size");
aschiffler@6999
   577
      return (rwops);
aschiffler@6999
   578
    }
slouken@0
   579
slouken@1895
   580
    rwops = SDL_AllocRW();
slouken@1895
   581
    if (rwops != NULL) {
slouken@6642
   582
        rwops->size = mem_size;
slouken@1895
   583
        rwops->seek = mem_seek;
slouken@1895
   584
        rwops->read = mem_read;
slouken@1895
   585
        rwops->write = mem_write;
slouken@1895
   586
        rwops->close = mem_close;
slouken@1895
   587
        rwops->hidden.mem.base = (Uint8 *) mem;
slouken@1895
   588
        rwops->hidden.mem.here = rwops->hidden.mem.base;
slouken@1895
   589
        rwops->hidden.mem.stop = rwops->hidden.mem.base + size;
aschiffler@6999
   590
        rwops->type = SDL_RWOPS_MEMORY;
slouken@1895
   591
    }
slouken@1895
   592
    return (rwops);
slouken@0
   593
}
slouken@0
   594
slouken@1895
   595
SDL_RWops *
slouken@1895
   596
SDL_RWFromConstMem(const void *mem, int size)
slouken@764
   597
{
aschiffler@6999
   598
    SDL_RWops *rwops = NULL;
aschiffler@6999
   599
    if (!mem) {
aschiffler@6999
   600
      SDL_InvalidParamError("mem");
aschiffler@6999
   601
      return (rwops);
aschiffler@6999
   602
    }
aschiffler@6999
   603
    if (!size) {
aschiffler@6999
   604
      SDL_InvalidParamError("size");
aschiffler@6999
   605
      return (rwops);
aschiffler@6999
   606
    }
slouken@764
   607
slouken@1895
   608
    rwops = SDL_AllocRW();
slouken@1895
   609
    if (rwops != NULL) {
slouken@6642
   610
        rwops->size = mem_size;
slouken@1895
   611
        rwops->seek = mem_seek;
slouken@1895
   612
        rwops->read = mem_read;
slouken@1895
   613
        rwops->write = mem_writeconst;
slouken@1895
   614
        rwops->close = mem_close;
slouken@1895
   615
        rwops->hidden.mem.base = (Uint8 *) mem;
slouken@1895
   616
        rwops->hidden.mem.here = rwops->hidden.mem.base;
slouken@1895
   617
        rwops->hidden.mem.stop = rwops->hidden.mem.base + size;
aschiffler@6999
   618
        rwops->type = SDL_RWOPS_MEMORY_RO;
slouken@1895
   619
    }
slouken@1895
   620
    return (rwops);
slouken@764
   621
}
slouken@764
   622
slouken@1895
   623
SDL_RWops *
slouken@1895
   624
SDL_AllocRW(void)
slouken@0
   625
{
slouken@1895
   626
    SDL_RWops *area;
slouken@0
   627
slouken@1895
   628
    area = (SDL_RWops *) SDL_malloc(sizeof *area);
slouken@1895
   629
    if (area == NULL) {
slouken@1895
   630
        SDL_OutOfMemory();
slouken@7070
   631
    } else {
slouken@7070
   632
        area->type = SDL_RWOPS_UNKNOWN;
slouken@1895
   633
    }
slouken@1895
   634
    return (area);
slouken@0
   635
}
slouken@0
   636
slouken@1895
   637
void
slouken@1895
   638
SDL_FreeRW(SDL_RWops * area)
slouken@0
   639
{
slouken@1895
   640
    SDL_free(area);
slouken@0
   641
}
slouken@1354
   642
slouken@1354
   643
/* Functions for dynamically reading and writing endian-specific values */
slouken@1354
   644
slouken@6655
   645
Uint8
slouken@6655
   646
SDL_ReadU8(SDL_RWops * src)
slouken@6655
   647
{
slouken@6655
   648
    Uint8 value = 0;
slouken@6655
   649
slouken@6655
   650
    SDL_RWread(src, &value, (sizeof value), 1);
slouken@6655
   651
    return value;
slouken@6655
   652
}
slouken@6655
   653
slouken@1895
   654
Uint16
slouken@1895
   655
SDL_ReadLE16(SDL_RWops * src)
slouken@1354
   656
{
slouken@6655
   657
    Uint16 value = 0;
slouken@1354
   658
slouken@1895
   659
    SDL_RWread(src, &value, (sizeof value), 1);
slouken@1895
   660
    return (SDL_SwapLE16(value));
slouken@1354
   661
}
slouken@1354
   662
slouken@1895
   663
Uint16
slouken@1895
   664
SDL_ReadBE16(SDL_RWops * src)
slouken@1354
   665
{
slouken@6655
   666
    Uint16 value = 0;
slouken@1895
   667
slouken@1895
   668
    SDL_RWread(src, &value, (sizeof value), 1);
slouken@1895
   669
    return (SDL_SwapBE16(value));
slouken@1354
   670
}
slouken@1895
   671
slouken@1895
   672
Uint32
slouken@1895
   673
SDL_ReadLE32(SDL_RWops * src)
slouken@1354
   674
{
slouken@6655
   675
    Uint32 value = 0;
slouken@1895
   676
slouken@1895
   677
    SDL_RWread(src, &value, (sizeof value), 1);
slouken@1895
   678
    return (SDL_SwapLE32(value));
slouken@1354
   679
}
slouken@1895
   680
slouken@1895
   681
Uint32
slouken@1895
   682
SDL_ReadBE32(SDL_RWops * src)
slouken@1354
   683
{
slouken@6655
   684
    Uint32 value = 0;
slouken@1895
   685
slouken@1895
   686
    SDL_RWread(src, &value, (sizeof value), 1);
slouken@1895
   687
    return (SDL_SwapBE32(value));
slouken@1354
   688
}
slouken@1895
   689
slouken@1895
   690
Uint64
slouken@1895
   691
SDL_ReadLE64(SDL_RWops * src)
slouken@1354
   692
{
slouken@6655
   693
    Uint64 value = 0;
slouken@1895
   694
slouken@1895
   695
    SDL_RWread(src, &value, (sizeof value), 1);
slouken@1895
   696
    return (SDL_SwapLE64(value));
slouken@1354
   697
}
slouken@1895
   698
slouken@1895
   699
Uint64
slouken@1895
   700
SDL_ReadBE64(SDL_RWops * src)
slouken@1354
   701
{
slouken@6655
   702
    Uint64 value = 0;
slouken@1895
   703
slouken@1895
   704
    SDL_RWread(src, &value, (sizeof value), 1);
slouken@1895
   705
    return (SDL_SwapBE64(value));
slouken@1354
   706
}
slouken@1895
   707
slouken@3253
   708
size_t
slouken@6655
   709
SDL_WriteU8(SDL_RWops * dst, Uint8 value)
slouken@6655
   710
{
slouken@6655
   711
    return (SDL_RWwrite(dst, &value, (sizeof value), 1));
slouken@6655
   712
}
slouken@6655
   713
slouken@6655
   714
size_t
slouken@1895
   715
SDL_WriteLE16(SDL_RWops * dst, Uint16 value)
slouken@1354
   716
{
slouken@1895
   717
    value = SDL_SwapLE16(value);
slouken@1895
   718
    return (SDL_RWwrite(dst, &value, (sizeof value), 1));
slouken@1354
   719
}
slouken@1895
   720
slouken@3253
   721
size_t
slouken@1895
   722
SDL_WriteBE16(SDL_RWops * dst, Uint16 value)
slouken@1895
   723
{
slouken@1895
   724
    value = SDL_SwapBE16(value);
slouken@1895
   725
    return (SDL_RWwrite(dst, &value, (sizeof value), 1));
slouken@1895
   726
}
slouken@1895
   727
slouken@3253
   728
size_t
slouken@1895
   729
SDL_WriteLE32(SDL_RWops * dst, Uint32 value)
slouken@1895
   730
{
slouken@1895
   731
    value = SDL_SwapLE32(value);
slouken@1895
   732
    return (SDL_RWwrite(dst, &value, (sizeof value), 1));
slouken@1895
   733
}
slouken@1895
   734
slouken@3253
   735
size_t
slouken@1895
   736
SDL_WriteBE32(SDL_RWops * dst, Uint32 value)
slouken@1895
   737
{
slouken@1895
   738
    value = SDL_SwapBE32(value);
slouken@1895
   739
    return (SDL_RWwrite(dst, &value, (sizeof value), 1));
slouken@1895
   740
}
slouken@1895
   741
slouken@3253
   742
size_t
slouken@1895
   743
SDL_WriteLE64(SDL_RWops * dst, Uint64 value)
slouken@1895
   744
{
slouken@1895
   745
    value = SDL_SwapLE64(value);
slouken@1895
   746
    return (SDL_RWwrite(dst, &value, (sizeof value), 1));
slouken@1895
   747
}
slouken@1895
   748
slouken@3253
   749
size_t
slouken@1895
   750
SDL_WriteBE64(SDL_RWops * dst, Uint64 value)
slouken@1895
   751
{
slouken@1895
   752
    value = SDL_SwapBE64(value);
slouken@1895
   753
    return (SDL_RWwrite(dst, &value, (sizeof value), 1));
slouken@1895
   754
}
slouken@1895
   755
slouken@1895
   756
/* vi: set ts=4 sw=4 expandtab: */