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-rw-r--r--lib/libftp/ftplib.c71
1 files changed, 63 insertions, 8 deletions
diff --git a/lib/libftp/ftplib.c b/lib/libftp/ftplib.c
index b69744eb..8be3cac1 100644
--- a/lib/libftp/ftplib.c
+++ b/lib/libftp/ftplib.c
@@ -32,6 +32,7 @@
#include <string.h>
#include <errno.h>
#include <ctype.h>
+#include <time.h>
#if defined(__unix__)
#include <sys/time.h>
#include <sys/types.h>
@@ -1512,18 +1513,35 @@ static int HttpXfer(const char *localfile, const char *path, int *size,
* return 1 if successful, 0 otherwise
*/
GLOBALREF int HttpGet(const char *host, const char *outputfile, const char *path,
- int *size, netbuf *nControl, unsigned int offset)
+ int *size, netbuf *nControl, unsigned int offset,
+ const struct tm *mtime1, struct tm *mtime2)
{
- char buf[256];
+ char buf[512];
- if(offset > 0)
- sprintf(buf, "GET %s HTTP/1.1\r\nHost: %s\r\nRange: bytes=%d-\r\n\r\n", path, host, offset);
- else
- sprintf(buf, "GET %s HTTP/1.1\r\nHost: %s\r\n\r\n", path, host);
- if(!HttpSendCmd(buf,'2',nControl))
+ sprintf(buf, "GET %s HTTP/1.1\r\nHost: %s\r\n", path, host);
+ if (offset > 0)
+ sprintf(buf, "%sRange: bytes=%d-\r\n", buf, offset);
+ if (mtime1 && mtime1->tm_year)
+ {
+ char mtime[30];
+ /* Format:
+ * "If-Modified-Since: Sat, 29 Oct 1994 19:43:31 GMT\r\n" */
+ strftime(mtime, sizeof(mtime), "%a, %d %b %Y %H:%M:%S GMT", mtime1);
+ sprintf(buf, "%sIf-Modified-Since: %s\r\n", buf, mtime);
+ }
+ sprintf(buf, "%s\r\n", buf);
+
+ if (!HttpSendCmd(buf,'2',nControl))
{
if (nControl->response[9] == '3')
+ {
+ /* If the answer from the server is 304, the requested file
+ * hasn't been modified: no need to retrieve it */
+ if (mtime1 && mtime1->tm_year && nControl->response[11] == '4')
+ return 0;
+ /* otherwise, it is a redirection */
printf("redirection not supported\n");
+ }
return 0;
}
@@ -1545,9 +1563,46 @@ GLOBALREF int HttpGet(const char *host, const char *outputfile, const char *path
if (strstr(nControl->response,"Content-Length"))
{
sscanf(nControl->response,"Content-Length: %d",size);
- if(offset > 0)
+ if (offset > 0)
*size += offset;
}
+ else if (mtime2 && strstr(nControl->response,"Last-Modified"))
+ {
+ /* Format:
+ * "Last-Modified: Sat, 29 Oct 1994 19:43:31 GMT\r\n" */
+ char *c = nControl->response+20;
+ int mint, j;
+ static const int months[12] = {
+ ('J'<<16)|('a'<<8)|'n',
+ ('F'<<16)|('e'<<8)|'b',
+ ('M'<<16)|('a'<<8)|'r',
+ ('A'<<16)|('p'<<8)|'r',
+ ('M'<<16)|('a'<<8)|'y',
+ ('J'<<16)|('u'<<8)|'n',
+ ('J'<<16)|('u'<<8)|'l',
+ ('A'<<16)|('u'<<8)|'g',
+ ('S'<<16)|('e'<<8)|'p',
+ ('O'<<16)|('c'<<8)|'t',
+ ('N'<<16)|('o'<<8)|'v',
+ ('D'<<16)|('e'<<8)|'c'
+ };
+ mtime2->tm_mday = (c[0]-'0')*10+c[1]-'0';
+ mint = (c[3]<<16)|(c[4]<<8)|c[5];
+ mtime2->tm_mon = 0;
+ for(j = 0; j < 12; j++)
+ {
+ if (mint == months[j])
+ {
+ mtime2->tm_mon = j;
+ break;
+ }
+ }
+ mtime2->tm_year = ((c[7]-'0')*10+(c[8]-'0')-19)*100;
+ mtime2->tm_year += (c[9]-'0')*10+c[10]-'0';
+ mtime2->tm_hour = (c[12]-'0')*10+c[13]-'0';
+ mtime2->tm_min = (c[15]-'0')*10+c[16]-'0';
+ mtime2->tm_sec = (c[18]-'0')*10+c[19]-'0';
+ }
if (strlen(nControl->response) == 0)
break;
}