mirror of
https://github.com/VincentWei/MiniGUI.git
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377 lines
9.8 KiB
C
377 lines
9.8 KiB
C
///////////////////////////////////////////////////////////////////////////////
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//
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// IMPORTANT NOTICE
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//
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// The following open source license statement does not apply to any
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// entity in the Exception List published by FMSoft.
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//
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// For more information, please visit:
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//
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// https://www.fmsoft.cn/exception-list
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//
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//////////////////////////////////////////////////////////////////////////////
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/*
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* This file is part of MiniGUI, a mature cross-platform windowing
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* and Graphics User Interface (GUI) support system for embedded systems
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* and smart IoT devices.
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*
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* Copyright (C) 2002~2018, Beijing FMSoft Technologies Co., Ltd.
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* Copyright (C) 1998~2002, WEI Yongming
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* Or,
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*
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* As this program is a library, any link to this program must follow
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* GNU General Public License version 3 (GPLv3). If you cannot accept
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* GPLv3, you need to be licensed from FMSoft.
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*
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* If you have got a commercial license of this program, please use it
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* under the terms and conditions of the commercial license.
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*
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* For more information about the commercial license, please refer to
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* <http://www.minigui.com/blog/minigui-licensing-policy/>.
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*/
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/*
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** rwops.c:
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** Functions for reading and writing data from general sources,
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** such as file, memory, etc.
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**
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** The idea and most code come from SDL - Simple DirectMedia Layer
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**
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** Current maintainer: Wei Yongming.
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**
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** Create date: 2001/12/14
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**
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "common.h"
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#include "endianrw.h"
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#define MGUI_Error(x)
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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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/* Functions to read/write stdio file pointers */
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static int stdio_seek(MG_RWops *context, int offset, int whence)
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{
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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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} else {
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MGUI_Error(MGUI_EFSEEK);
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return(-1);
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}
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}
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static int stdio_read(MG_RWops *context, void *ptr, int size, int 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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MGUI_Error(MGUI_EFREAD);
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}
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return(nread);
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}
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static int stdio_write(MG_RWops *context, const void *ptr, int size, int 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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MGUI_Error(MGUI_EFWRITE);
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}
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return(nwrote);
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}
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#ifdef _MGUSE_OWN_STDIO
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static int stdio_ungetc(MG_RWops *context, unsigned char c)
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{
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return ungetc (c, context->hidden.stdio.fp);
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}
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#endif
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static int stdio_close(MG_RWops *context)
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{
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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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fclose(context->hidden.stdio.fp);
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}
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free(context);
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}
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return(0);
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}
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static int stdio_eof(MG_RWops *context)
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{
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return feof (context->hidden.stdio.fp);
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}
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/* Functions to read/write memory pointers */
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static int mem_seek(MG_RWops *context, int offset, int whence)
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{
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Uint8 *newpos;
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switch (whence) {
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case SEEK_SET:
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newpos = context->hidden.mem.base+offset;
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break;
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case SEEK_CUR:
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newpos = context->hidden.mem.here+offset;
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break;
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case SEEK_END:
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newpos = context->hidden.mem.stop+offset;
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break;
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default:
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_WRN_PRINTF ("MISC>RWOps: Unknown value for 'whence'\n");
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return(-1);
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}
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if ( newpos < context->hidden.mem.base ) {
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newpos = context->hidden.mem.base;
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}
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if ( newpos > context->hidden.mem.stop ) {
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newpos = context->hidden.mem.stop;
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}
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context->hidden.mem.here = newpos;
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return(context->hidden.mem.here-context->hidden.mem.base);
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}
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static int mem_read(MG_RWops *context, void *ptr, int size, int maxnum)
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{
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int num;
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num = maxnum;
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if ( (context->hidden.mem.here + (num*size)) > context->hidden.mem.stop ) {
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num = (context->hidden.mem.stop-context->hidden.mem.here)/size;
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}
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memcpy(ptr, context->hidden.mem.here, num*size);
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context->hidden.mem.here += num*size;
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return(num);
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}
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static int mem_write(MG_RWops *context, const void *ptr, int size, int num)
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{
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if ( (context->hidden.mem.here + (num*size)) > context->hidden.mem.stop ) {
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num = (context->hidden.mem.stop-context->hidden.mem.here)/size;
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}
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memcpy(context->hidden.mem.here, ptr, num*size);
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context->hidden.mem.here += num*size;
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return(num);
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}
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#ifdef _MGUSE_OWN_STDIO
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static int mem_ungetc(MG_RWops *context, unsigned char c)
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{
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if (context->hidden.mem.here > context->hidden.mem.base) {
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context->hidden.mem.here--;
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*context->hidden.mem.here = c;
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return c;
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}
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return EOF;
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}
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#endif
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static int mem_close(MG_RWops *context)
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{
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if ( context ) {
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free(context);
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}
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return(0);
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}
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static int mem_close_none (MG_RWops *context)
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{
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return(0);
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}
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static int mem_eof(MG_RWops *context)
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{
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if (context->hidden.mem.here >= context->hidden.mem.stop)
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return 1;
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return 0;
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}
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/* Functions to create MG_RWops structures from various data sources */
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#ifdef macintosh
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/*
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* translate unix-style slash-separated filename to mac-style colon-separated
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* name; return malloced string
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*/
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static char *unix_to_mac(const char *file)
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{
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int flen = strlen(file);
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char *path = malloc(flen + 2);
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const char *src = file;
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char *dst = path;
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if(*src == '/') {
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/* really depends on filesystem layout, hope for the best */
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src++;
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} else {
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/* Check if this is a MacOS path to begin with */
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if(*src != ':')
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*dst++ = ':'; /* relative paths begin with ':' */
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}
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while(src < file + flen) {
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const char *end = strchr(src, '/');
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int len;
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if(!end)
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end = file + flen; /* last component */
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len = end - src;
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if(len == 0 || (len == 1 && src[0] == '.')) {
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/* remove repeated slashes and . */
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} else {
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if(len == 2 && src[0] == '.' && src[1] == '.') {
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/* replace .. with the empty string */
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} else {
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memcpy(dst, src, len);
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dst += len;
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}
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if(end < file + flen)
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*dst++ = ':';
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}
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src = end + 1;
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}
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*dst++ = '\0';
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return path;
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}
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#endif /* macintosh */
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MG_RWops *MGUI_RWFromFile(const char *file, const char *mode)
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{
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FILE *fp;
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MG_RWops *rwops;
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rwops = NULL;
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#ifdef macintosh
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{
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char *mpath = unix_to_mac(file);
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fp = fopen(mpath, mode);
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free(mpath);
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}
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#else
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fp = fopen(file, (char*)mode);
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#endif
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if ( fp == NULL ) {
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_WRN_PRINTF ("MISC>RWOps: Couldn't open %s\n", file);
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} else {
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rwops = MGUI_RWFromFP(fp, 1);
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}
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return(rwops);
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}
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MG_RWops *MGUI_RWFromFP(FILE *fp, int autoclose)
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{
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MG_RWops *rwops;
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rwops = MGUI_AllocRW();
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if ( rwops != NULL ) {
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rwops->seek = stdio_seek;
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rwops->read = stdio_read;
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rwops->write = stdio_write;
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#ifdef _MGUSE_OWN_STDIO
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rwops->ungetc = stdio_ungetc;
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#endif
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rwops->close = stdio_close;
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rwops->eof = stdio_eof;
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rwops->hidden.stdio.fp = fp;
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rwops->hidden.stdio.autoclose = autoclose;
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rwops->type = RWAREA_TYPE_STDIO;
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}
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return(rwops);
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}
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MG_RWops *MGUI_RWFromMem(void *mem, size_t size)
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{
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MG_RWops *rwops;
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rwops = MGUI_AllocRW();
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if ( rwops != NULL ) {
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rwops->seek = mem_seek;
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rwops->read = mem_read;
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rwops->write = mem_write;
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#ifdef _MGUSE_OWN_STDIO
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rwops->ungetc = mem_ungetc;
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#endif
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rwops->close = mem_close;
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rwops->eof = mem_eof;
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rwops->hidden.mem.base = (Uint8 *)mem;
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rwops->hidden.mem.here = rwops->hidden.mem.base;
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if ((UINT_PTR_MAX - (UINT_PTR)mem) < size)
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rwops->hidden.mem.stop = (void*)UINT_PTR_MAX;
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else
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rwops->hidden.mem.stop = rwops->hidden.mem.base+size;
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rwops->type = RWAREA_TYPE_MEM;
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}
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return(rwops);
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}
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void MGUI_InitMemRW (MG_RWops* area, void *mem, size_t size)
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{
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area->seek = mem_seek;
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area->read = mem_read;
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area->write = mem_write;
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#ifdef _MGUSE_OWN_STDIO
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area->ungetc = mem_ungetc;
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#endif
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area->close = mem_close_none;
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area->eof = mem_eof;
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area->hidden.mem.base = (Uint8 *)mem;
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area->hidden.mem.here = area->hidden.mem.base;
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if ((UINT_PTR_MAX - (UINT_PTR)mem) < size)
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area->hidden.mem.stop = (void*)UINT_PTR_MAX;
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else
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area->hidden.mem.stop = area->hidden.mem.base+size;
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area->type = RWAREA_TYPE_MEM;
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}
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MG_RWops *MGUI_AllocRW(void)
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{
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MG_RWops *area;
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area = (MG_RWops *)malloc(sizeof *area);
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if ( area == NULL ) {
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_WRN_PRINTF ("MISC>RWOps: Out of memory\n");
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}
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else
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area->type = RWAREA_TYPE_UNKNOWN;
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return(area);
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}
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void MGUI_FreeRW(MG_RWops *area)
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{
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free(area);
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}
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int MGUI_RWgetc (MG_RWops* area)
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{
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unsigned char c;
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if (MGUI_RWread (area, &c, 1, 1) == 0)
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return EOF;
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return c;
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}
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