1 files changed, 125 insertions, 0 deletions
diff --git a/lib/nghttp3_conv.c b/lib/nghttp3_conv.c
new file mode 100644
index 0000000..f7853d9
--- /dev/null
+++ b/lib/nghttp3_conv.c
@@ -0,0 +1,125 @@
+/*
+ * nghttp3
+ *
+ * Copyright (c) 2019 nghttp3 contributors
+ * Copyright (c) 2017 ngtcp2 contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#include "nghttp3_conv.h"
+
+#include <string.h>
+#include <assert.h>
+
+#include "nghttp3_str.h"
+#include "nghttp3_unreachable.h"
+
+int64_t nghttp3_get_varint(size_t *plen, const uint8_t *p) {
+  union {
+    char b[8];
+    uint16_t n16;
+    uint32_t n32;
+    uint64_t n64;
+  } n;
+
+  *plen = 1u << (*p >> 6);
+
+  switch (*plen) {
+  case 1:
+    return (int64_t)*p;
+  case 2:
+    memcpy(&n, p, 2);
+    n.b[0] &= 0x3f;
+    return (int64_t)ntohs(n.n16);
+  case 4:
+    memcpy(&n, p, 4);
+    n.b[0] &= 0x3f;
+    return (int64_t)ntohl(n.n32);
+  case 8:
+    memcpy(&n, p, 8);
+    n.b[0] &= 0x3f;
+    return (int64_t)nghttp3_ntohl64(n.n64);
+  }
+
+  nghttp3_unreachable();
+}
+
+int64_t nghttp3_get_varint_fb(const uint8_t *p) { return *p & 0x3f; }
+
+size_t nghttp3_get_varintlen(const uint8_t *p) { return 1u << (*p >> 6); }
+
+uint8_t *nghttp3_put_uint64be(uint8_t *p, uint64_t n) {
+  n = nghttp3_htonl64(n);
+  return nghttp3_cpymem(p, (const uint8_t *)&n, sizeof(n));
+}
+
+uint8_t *nghttp3_put_uint32be(uint8_t *p, uint32_t n) {
+  n = htonl(n);
+  return nghttp3_cpymem(p, (const uint8_t *)&n, sizeof(n));
+}
+
+uint8_t *nghttp3_put_uint16be(uint8_t *p, uint16_t n) {
+  n = htons(n);
+  return nghttp3_cpymem(p, (const uint8_t *)&n, sizeof(n));
+}
+
+uint8_t *nghttp3_put_varint(uint8_t *p, int64_t n) {
+  uint8_t *rv;
+  if (n < 64) {
+    *p++ = (uint8_t)n;
+    return p;
+  }
+  if (n < 16384) {
+    rv = nghttp3_put_uint16be(p, (uint16_t)n);
+    *p |= 0x40;
+    return rv;
+  }
+  if (n < 1073741824) {
+    rv = nghttp3_put_uint32be(p, (uint32_t)n);
+    *p |= 0x80;
+    return rv;
+  }
+  assert(n < 4611686018427387904LL);
+  rv = nghttp3_put_uint64be(p, (uint64_t)n);
+  *p |= 0xc0;
+  return rv;
+}
+
+size_t nghttp3_put_varintlen(int64_t n) {
+  if (n < 64) {
+    return 1;
+  }
+  if (n < 16384) {
+    return 2;
+  }
+  if (n < 1073741824) {
+    return 4;
+  }
+  assert(n < 4611686018427387904LL);
+  return 8;
+}
+
+uint64_t nghttp3_ord_stream_id(int64_t stream_id) {
+  return (uint64_t)(stream_id >> 2) + 1;
+}
+
+uint8_t nghttp3_pri_to_uint8(const nghttp3_pri *pri) {
+  return (uint8_t)((uint32_t)pri->inc << 7 | pri->urgency);
+}