[hackers] [quark][PATCH] Add support for precomputed compression

From: Guy Sviry <sviryguy_AT_gmail.com>
Date: Sun, 8 Mar 2020 19:27:03 +0200

If a client indicates that it supports gzip, then look for a `.gz`
variation of requested file. If such gzipped file exists, send it
instead and set the appropriate headers.

Range requests and dirlist requests are not supported.

---
 http.c | 24 ++++++++++++++++++++++--
 http.h |  1 +
 resp.c |  5 +++--
 resp.h |  2 +-
 4 files changed, 27 insertions(+), 5 deletions(-)
diff --git a/http.c b/http.c
index efc4136..a654514 100644
--- a/http.c
+++ b/http.c
_AT__AT_ -25,6 +25,7 @@ const char *req_field_str[] = {
  [REQ_HOST]    = "Host",
  [REQ_RANGE]   = "Range",
  [REQ_MOD]     = "If-Modified-Since",
+ [REQ_ENCODE]  = "Accept-Encoding",
 };
 const char *req_method_str[] = {
_AT__AT_ -349,7 +350,7 @@ enum status
 http_send_response(int fd, struct request *r)
 {
  struct in6_addr res;
- struct stat st;
+ struct stat st, gzst;
  struct tm tm;
  size_t len, i;
  off_t lower, upper;
_AT__AT_ -604,5 +605,24 @@ http_send_response(int fd, struct request *r)
  }
  }
- return resp_file(fd, RELPATH(realtarget), r, &st, mime, lower, upper);
+ /* encoding-compression */
+ if (r->field[REQ_ENCODE][0] && !r->field[REQ_RANGE][0]) {
+ for (p = r->field[REQ_ENCODE]; p; p = strchr(p, ','), p ? p++ : p) {
+ /* skip whitespace */
+ for (; *p == ' ' || *p == '\t'; p++)
+ ;
+ if (!strncasecmp(p, "gzip", sizeof("gzip")-1) &&
+ !esnprintf(tmptarget, sizeof(tmptarget), "%s%s", realtarget,
+ ".gz") &&
+ !stat(RELPATH(tmptarget), &gzst) &&
+ S_ISREG(gzst.st_mode)) {
+ lower = 0;
+ upper = gzst.st_size-1;
+ return resp_file(fd, RELPATH(tmptarget), r, &gzst, mime,
+ "Content-Encoding: gzip\r\n", lower, upper);
+ }
+ }
+ }
+
+ return resp_file(fd, RELPATH(realtarget), r, &st, mime, "", lower, upper);
 }
diff --git a/http.h b/http.h
index cd1ba22..26ced90 100644
--- a/http.h
+++ b/http.h
_AT__AT_ -11,6 +11,7 @@ enum req_field {
  REQ_HOST,
  REQ_RANGE,
  REQ_MOD,
+ REQ_ENCODE,
  NUM_REQ_FIELDS,
 };
diff --git a/resp.c b/resp.c
index 3075c28..bf35ac8 100644
--- a/resp.c
+++ b/resp.c
_AT__AT_ -111,7 +111,7 @@ cleanup:
 enum status
 resp_file(int fd, char *name, struct request *r, struct stat *st, char
*mime,
-          off_t lower, off_t upper)
+          char *encoding, off_t lower, off_t upper)
 {
  FILE *fp;
  enum status s;
_AT__AT_ -142,10 +142,11 @@ resp_file(int fd, char *name, struct request *r,
struct stat *st, char *mime,
             "Connection: close\r\n"
             "Last-Modified: %s\r\n"
             "Content-Type: %s\r\n"
+ "%s"
             "Content-Length: %zu\r\n",
             s, status_str[s], timestamp(time(NULL), t1),
             timestamp(st->st_mtim.tv_sec, t2), mime,
-            upper - lower + 1) < 0) {
+            encoding, upper - lower + 1) < 0) {
  s = S_REQUEST_TIMEOUT;
  goto cleanup;
  }
diff --git a/resp.h b/resp.h
index d5928ef..ccfaaad 100644
--- a/resp.h
+++ b/resp.h
_AT__AT_ -9,6 +9,6 @@
 enum status resp_dir(int, char *, struct request *);
 enum status resp_file(int, char *, struct request *, struct stat *, char *,
-                      off_t, off_t);
+                      char *, off_t, off_t);
 #endif /* RESP_H */
-- 
2.25.1

Received on Sun Mar 08 2020 - 18:27:03 CET