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133 lines
3.7 KiB
C
133 lines
3.7 KiB
C
/*
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* Copyright (c) 2001-2003 Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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*/
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#include "lwip/def.h"
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#include "fs.h"
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#include "fsdata.h"
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#include "fsdata.c"
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#include <string.h>
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/*-----------------------------------------------------------------------------------*/
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/* Define the number of open files that we can support. */
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#ifndef LWIP_MAX_OPEN_FILES
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#define LWIP_MAX_OPEN_FILES 10
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#endif
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/* Define the file system memory allocation structure. */
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struct fs_table {
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struct fs_file file;
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int inuse;
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};
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/* Allocate file system memory */
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struct fs_table fs_memory[LWIP_MAX_OPEN_FILES];
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/*-----------------------------------------------------------------------------------*/
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static struct fs_file *
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fs_malloc(void)
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{
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int i;
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for(i = 0; i < LWIP_MAX_OPEN_FILES; i++) {
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if(fs_memory[i].inuse == 0) {
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fs_memory[i].inuse = 1;
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return(&fs_memory[i].file);
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}
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}
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return(NULL);
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}
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/*-----------------------------------------------------------------------------------*/
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static void
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fs_free(struct fs_file *file)
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{
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int i;
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for(i = 0; i < LWIP_MAX_OPEN_FILES; i++) {
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if(&fs_memory[i].file == file) {
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fs_memory[i].inuse = 0;
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break;
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}
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}
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return;
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}
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/*-----------------------------------------------------------------------------------*/
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struct fs_file *
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fs_open(const char *name)
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{
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struct fs_file *file;
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const struct fsdata_file *f;
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file = fs_malloc();
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if(file == NULL) {
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return NULL;
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}
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for(f = FS_ROOT; f != NULL; f = f->next) {
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if (!strcmp(name, (char *)f->name)) {
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file->data = (const char *)f->data;
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file->len = f->len;
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file->index = f->len;
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file->pextension = NULL;
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return file;
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}
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}
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fs_free(file);
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return NULL;
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}
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/*-----------------------------------------------------------------------------------*/
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void
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fs_close(struct fs_file *file)
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{
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fs_free(file);
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}
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/*-----------------------------------------------------------------------------------*/
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int
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fs_read(struct fs_file *file, char *buffer, int count)
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{
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int read;
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if(file->index == file->len) {
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return -1;
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}
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read = file->len - file->index;
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if(read > count) {
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read = count;
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}
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memcpy(buffer, (file->data + file->index), read);
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file->index += read;
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return(read);
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}
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