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問題我正在編寫一個支持HTTP的基於C的服務器。 &緩衝區[5]具有文件名。我在下一步中設置標題，然後以8Kb的塊發送文件。當我請求一個txt文件時它工作正常，但是當我請求一個jpg文件時，它沒有給出任何o/p。 是否有任何特別的照顧我需要採取的圖像文件或存在一些其他問題。爲JPG文件發送圖像文件通過套接字在c
void web(int fd)
{
int j, file_fd;
int buflen; int len;
long i, ret;
char * fstr;
static char buffer[BUFSIZE+1]; /* static so zero filled */
ret =read(fd,buffer,BUFSIZE); /* read Web request in one go */
if(ret == 0 || ret == -1) { /* read failure stop now */
//log1(SORRY,"failed to read browser request","",fd);
}
if(ret > 0 && ret < BUFSIZE) /* return code is valid chars */
buffer[ret]=0; /* terminate the buffer */
else buffer[0]=0;
for(i=0;i<ret;i++) /* remove CF and LF characters */
if(buffer[i] == '\r' || buffer[i] == '\n')
buffer[i]='*';
log1(LOG,"request",buffer,1);
if(strncmp(buffer,"GET ",4) && strncmp(buffer,"get ",4))
log1(SORRY,"Only simple GET operation supported",buffer,fd);
for(i=4;i<BUFSIZE;i++) { /* null terminate after the second space to ignore extra stuff */
if(buffer[i] == ' ') { /* string is "GET URL " +lots of other stuff */
buffer[i] = 0;
break;
}
}
for(j=0;j<i-1;j++) /* check for illegal parent directory use .. */
if(buffer[j] == '.' && buffer[j+1] == '.')
log1(SORRY,"HTTP/1.0 400 Bad Request: Invalid URI: \n Parent directory (..) path names not supported",buffer,fd);
if(!strncmp(&buffer[0],"GET /\0",6) || !strncmp(&buffer[0],"get /\0",6)) /* convert no filename to index file */
(void)strcpy(buffer,"GET /index.html");
/* work out the file type and check we support it */
buflen=strlen(buffer);
fstr = (char *)0;
for(i=0;extensions[i].ext != 0;i++) {
len = strlen(extensions[i].ext);
printf("%s\t%s\t%d\n", &buffer[buflen-len],extensions[i].ext, strncmp(&buffer[buflen-len], extensions[i].ext, len));
if(!strncmp(&buffer[buflen-len], extensions[i].ext, len)) {
fstr =extensions[i].filetype;
break;
}
}
if(fstr == 0)
log1(SORRY,"HTTP/1.0 400 Bad Request: Invalid URI:\n file extension type not supported",buffer,fd);
printf("Buffer Value: %s\n",&buffer[5]);
if((file_fd = open(&buffer[5],O_RDONLY)) == -1) /* open the file for reading */
{
log1(SORRY, "HTTP/1.0 404 Not Found\n failed to open file",&buffer[5],fd);}
printf("file Descrptr:%d\n",file_fd);
log1(LOG,"SEND",&buffer[5],1);
(void)sprintf(buffer,"HTTP/1.0 200 OK\r\nContent-Type: %s\r\n\r\n", fstr);
(void)write(fd,buffer,strlen(buffer));
printf("Buffer Header:%s\n",buffer);
//int rec = read(file_fd, buffer, 10*BUFSIZE);
/* send file in 8KB block - last block may be smaller */
while ((ret = read(file_fd, buffer, BUFSIZE)) > 0) {
(void)write(fd,buffer,ret);
printf("BufferData:%d\n",strlen(buffer));
}
#ifdef LINUX
sleep(1); /* to allow socket to drain */
#endif
exit(1);
}
O/P：
server: got connection from 127.0.0.1
Buffer Header:HTTP/1.0 200 OK
Content-Type: image/jpeg
BufferData:4
BufferData:95
BufferData:122
BufferData:24
BufferData:217
爲txt文件：
Buffer Value: config.txt
file Descrptr:4
Buffer Header:HTTP/1.0 200 OK
Content-Type: text/plain
BufferData:416
@Jonathan ...正如你可以看到的O/P我打印的HTTP標頭看起來沒問題。我只有.jpg文件纔有問題......如果我將Buffsize從8Kb增加到更高值，是否有任何範圍。 – Glex 2011-01-25 07:03:44