1 files changed, 99 insertions, 0 deletions
diff --git a/src/http/v3/ngx_http_v3.c b/src/http/v3/ngx_http_v3.c
new file mode 100644
index 000000000..e796da772
--- /dev/null
+++ b/src/http/v3/ngx_http_v3.c
@@ -0,0 +1,99 @@
+
+/*
+ * Copyright (C) Roman Arutyunyan
+ * Copyright (C) Nginx, Inc.
+ */
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_http.h>
+
+
+uintptr_t
+ngx_http_v3_encode_varlen_int(u_char *p, uint64_t value)
+{
+    if (value <= 63) {
+        if (p == NULL) {
+            return 1;
+        }
+
+        *p++ = value;
+        return (uintptr_t) p;
+    }
+
+    if (value <= 16383) {
+        if (p == NULL) {
+            return 2;
+        }
+
+        *p++ = 0x40 | (value >> 8);
+        *p++ = value;
+        return (uintptr_t) p;
+    }
+
+    if (value <= 1073741823) {
+        if (p == NULL) {
+            return 4;
+        }
+
+        *p++ = 0x80 | (value >> 24);
+        *p++ = (value >> 16);
+        *p++ = (value >> 8);
+        *p++ = value;
+        return (uintptr_t) p;
+    }
+
+    if (p == NULL) {
+        return 8;
+    }
+
+    *p++ = 0xc0 | (value >> 56);
+    *p++ = (value >> 48);
+    *p++ = (value >> 40);
+    *p++ = (value >> 32);
+    *p++ = (value >> 24);
+    *p++ = (value >> 16);
+    *p++ = (value >> 8);
+    *p++ = value;
+    return (uintptr_t) p;
+}
+
+
+uintptr_t
+ngx_http_v3_encode_prefix_int(u_char *p, uint64_t value, ngx_uint_t prefix)
+{
+    ngx_uint_t  thresh, n;
+
+    thresh = (1 << prefix) - 1;
+
+    if (value < thresh) {
+        if (p == NULL) {
+            return 1;
+        }
+
+        *p++ |= value;
+        return (uintptr_t) p;
+    }
+
+    value -= thresh;
+
+    if (p == NULL) {
+        for (n = 2; value >= 128; n++) {
+            value >>= 7;
+        }
+
+        return n;
+    }
+
+    *p++ |= thresh;
+
+    while (value >= 128) {
+        *p++ = 0x80 | value;
+        value >>= 7;
+    }
+
+    *p++ = value;
+
+    return (uintptr_t) p;
+}