HTTP/2: used bitwise operation to replace division and modulo.

[tokers]

# HG changeset patch
# User Alex Zhang <zchao1995 at gmail.com>
# Date 1520229178 -28800
#      Mon Mar 05 13:52:58 2018 +0800
# Node ID 03ecef37a93d541e55802393636c101a4da14550
# Parent  265c29b0b8b8c54b1c623268481ed85324ce3c79
HTTP/2: used bitwise operation to replace division and modulo.

Signed-off-by: Alex Zhang <zchao1995 at gmail.com>

diff -r 265c29b0b8b8 -r 03ecef37a93d src/http/v2/ngx_http_v2.c
--- a/src/http/v2/ngx_http_v2.c Thu Mar 01 11:42:55 2018 +0300
+++ b/src/http/v2/ngx_http_v2.c Mon Mar 05 13:52:58 2018 +0800
@@ -1094,7 +1094,7 @@
                    "depends on %ui excl:%ui weight:%ui",
                    h2c->state.sid, depend, excl, weight);

-    if (h2c->state.sid % 2 == 0 || h2c->state.sid <= h2c->last_sid) {
+    if (h2c->state.sid & 0x1 == 0 || h2c->state.sid <= h2c->last_sid) {
         ngx_log_error(NGX_LOG_INFO, h2c->connection->log, 0,
                       "client sent HEADERS frame with incorrect identifier
"
                       "%ui, the last was %ui", h2c->state.sid,
h2c->last_sid);
diff -r 265c29b0b8b8 -r 03ecef37a93d src/http/v2/ngx_http_v2_filter_module.c
--- a/src/http/v2/ngx_http_v2_filter_module.c   Thu Mar 01 11:42:55 2018
+0300
+++ b/src/http/v2/ngx_http_v2_filter_module.c   Mon Mar 05 13:52:58 2018
+0800
@@ -1149,8 +1149,8 @@
     value -= prefix;

     while (value >= 128) {
-        *pos++ = value % 128 + 128;
-        value /= 128;
+        *pos++ = (value & 0x7f) + 128;
+        value >>= 7;
     }

     *pos++ = (u_char) value;
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