一个简单的wed服务器SHTTPD（7）———— SHTTPD内容类型的实现

//start from the very beginning,and to create greatness
//@author: Chuangwei Lin
//@E-mail：979951191@qq.com
//@brief： SHTTPD内容类型的实现
#include "lcw_shttpd.h"
//定义的内容类型格式如下
enum{
    MINET_HTML,    MINET_HTM,    MINET_TXT,    MINET_CSS,    MINET_ICO,    MINET_GIF,    MINET_JPG,    MINET_JPEG,
    MINET_PNG,    MINET_SVG,    MINET_TORRENT,    MINET_WAV,    MINET_MP3,    MINET_MID,    MINET_M3U,    MINET_RAM,
    MINET_RA,    MINET_DOC,    MINET_EXE,    MINET_ZIP,    MINET_XLS,    MINET_TGZ,    MINET_TARGZ,    MINET_TAR,
    MINET_GZ,    MINET_ARJ,    MINET_RAR,    MINET_RTF,    MINET_PDF,    MINET_SWF,    MINET_MPG,    MINET_MPEG,
    MINET_ASF,    MINET_AVI,    MINET_BMP
};
struct mine_type builtin_mime_types[] = 
{
    {"html",    MINET_HTML,    4,    "text/html"            },
    {"htm",        MINET_HTM,    3,    "text/html"            },
    {"txt",        MINET_TXT,    3,    "text/plain"            },
    {"css",        MINET_CSS,    3,    "text/css"            },
    {"ico",        MINET_ICO,    3,    "image/x-icon"            },
    {"gif",        MINET_GIF,    3,    "image/gif"            },
    {"jpg",        MINET_JPG,    3,    "image/jpeg"            },
    {"jpeg",    MINET_JPEG,    4,    "image/jpeg"            },
    {"png",        MINET_PNG,    3,    "image/png"            },
    {"svg",        MINET_SVG,    3,    "image/svg+xml"            },
    {"torrent",    MINET_TORRENT,    7,    "application/x-bittorrent"    },
    {"wav",        MINET_WAV,    3,    "audio/x-wav"            },
    {"mp3",        MINET_MP3,    3,    "audio/x-mp3"            },
    {"mid",        MINET_MID,    3,    "audio/mid"            },
    {"m3u",        MINET_M3U,    3,    "audio/x-mpegurl"        },
    {"ram",        MINET_RAM,    3,    "audio/x-pn-realaudio"        },
    {"ra",        MINET_RA,    2,    "audio/x-pn-realaudio"        },
    {"doc",        MINET_DOC,    3,    "application/msword",        },
    {"exe",        MINET_EXE,    3,    "application/octet-stream"    },
    {"zip",        MINET_ZIP,    3,    "application/x-zip-compressed"    },
    {"xls",        MINET_XLS,    3,    "application/excel"        },
    {"tgz",        MINET_TGZ,    3,    "application/x-tar-gz"        },
    {"tar.gz",    MINET_TARGZ,6,    "application/x-tar-gz"        },
    {"tar",        MINET_TAR,    3,    "application/x-tar"        },
    {"gz",        MINET_GZ,    2,    "application/x-gunzip"        },
    {"arj",        MINET_ARJ,    3,    "application/x-arj-compressed"    },
    {"rar",        MINET_RAR,    3,    "application/x-arj-compressed"    },
    {"rtf",        MINET_RTF,    3,    "application/rtf"        },
    {"pdf",        MINET_PDF,    3,    "application/pdf"        },
    {"swf",        MINET_SWF,    3,    "application/x-shockwave-flash"    },
    {"mpg",        MINET_MPG,    3,    "video/mpeg"            },
    {"mpeg",    MINET_MPEG,    4,    "video/mpeg"            },
    {"asf",        MINET_ASF,    3,    "video/x-ms-asf"        },
    {"avi",        MINET_AVI,    3,    "video/x-msvideo"        },
    {"bmp",        MINET_BMP,    3,    "image/bmp"            },
    {NULL,        -1,            0,    NULL                }
};
/******************************************************
函数名：Mine_Type(char *uri, int len, struct worker_ctl *wctl)
参数：
功能：根据输入的扩展名查找内容类型中的匹配项 
*******************************************************/
struct mine_type* Mine_Type(char *uri, int len, struct worker_ctl *wctl)
{
    DBGPRINT("LCW==>Mine_Type\n");
    int i = 0;
    //extern void *memchr(const void *buf, int ch, size_t count);
    //用法：#include <string.h>
    //功能：从buf所指内存区域的前count个字节查找字符ch。
    char *ext = memchr(uri, '.', len);//查找扩展名的位置
    struct mine_type *mine = NULL;
    int found = 0;
    ext++;//.之后，即为扩展名第一个字节的位置
    printf("uri:%s,len:%d,ext is %s\n",uri,len,ext);
    //匹配扩展名
    for(mine = &builtin_mime_types[i]; mine->extension != NULL; i++)
    {
        if(!strncmp(mine->extension,ext,mine->ext_len))
        {
            found = 1;//找到所支持的扩展名
            printf("found it, ext is %s\n",mine->extension);
            break;
        }
    }
    if(!found)//没有找到的时候默认类型为“text/plain/”
    {
        mine = &builtin_mime_types[2];
    }    
    DBGPRINT("LCW<==Mine_Type\n");
    return mine;
}