diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/libftp/ftplib.c | 71 | ||||
| -rw-r--r-- | lib/libftp/ftplib.h | 3 |
2 files changed, 65 insertions, 9 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; } diff --git a/lib/libftp/ftplib.h b/lib/libftp/ftplib.h index 49e0ccbf..4c2d95dd 100644 --- a/lib/libftp/ftplib.h +++ b/lib/libftp/ftplib.h @@ -121,7 +121,8 @@ GLOBALREF void FtpQuit(netbuf *nControl); GLOBALREF int HttpConnect(const char *host, unsigned short port, netbuf **nControl); GLOBALREF int HttpGet(const char *host, const char *output, const char *path, - int *size, netbuf *nControl, unsigned int offset); + int *size, netbuf *nControl, unsigned int offset, + const struct tm *mtime1, struct tm *mtime2); GLOBALREF void HttpQuit(netbuf *nControl); #ifdef __cplusplus |