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极简文件列表

news 2025/9/27 6:34:39

简介

单片机里搭建webserver，储存的资源需要用文件系统。如果使用fatfs之类的，体积太庞大，所以需要自己搭建一个按名访问的极简文件系统。

文件对象结构

typedef struct {char *name;char *content;
}File_Item_t;

name:文件名
content:文件内容

文件存储和注册

/// @brief File List
File_Item_t File_List[config_MAX_FileItem] = {0};/// @brief register file name and file content to FileSystem
/// @param i :index
/// @param name :file name
/// @param content :file content, could be stored in flash or in ram
void SF_register(uint16_t i, char *name, char *content)
{if(i >= config_MAX_FileItem)return;File_List[i].name = name;File_List[i].content = content;
}

文件按名访问

按名访问只做到获取文件内容头指针，对文件的读写要自己建立缓冲区进行读写，文件长度限制要注意。

/// @brief find file by name
/// @param file_name :file name
/// @param len :file name length, should be identical with name length in filesystem
/// @return file item pointer(File_Item_t *)
File_Item_t *SF_find(char *file_name, uint8_t len)
{if(len > config_MAX_Namelen)return 0;for(uint16_t i = 0; i < config_MAX_FileItem; i++){if((strlen(file_name) == strlen(File_List[i].name)) && (!memcmp(file_name, File_List[i].name, strlen(file_name)))){return &(File_List[i]);}}return 0;
}

测试

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include "Simple_Filesystem.h"const char *file0_name = "boot0.bin";
const char *file0_content = "bin0bin0bin0bin0bin0bin0bin0bin0bin0";
const char *file1_name = "boot1.bin";
const char *file1_content = "bin1bin1bin1bin1bin1bin1bin1bin1bin1";int main(int argc, char **argv)
{SF_register(0, (void *)file0_name, (void *)file0_content);SF_register(1, (void *)file1_name, (void *)file1_content);File_Item_t *filep = NULL;filep = SF_find("boot0.bin", strlen("boot0.bin"));if(filep)printf("file %s = %s\r\n",filep->name, filep->content);filep = SF_find("boot1.bin", strlen("boot1.bin"));if(filep)printf("file %s = %s\r\n",filep->name, filep->content);return 0;
}