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-rw-r--r--lib/ngtcp2_conv.c291
1 files changed, 291 insertions, 0 deletions
diff --git a/lib/ngtcp2_conv.c b/lib/ngtcp2_conv.c
new file mode 100644
index 0000000..3367217
--- /dev/null
+++ b/lib/ngtcp2_conv.c
@@ -0,0 +1,291 @@
+/*
+ * ngtcp2
+ *
+ * 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 "ngtcp2_conv.h"
+
+#include <string.h>
+#include <assert.h>
+
+#include "ngtcp2_str.h"
+#include "ngtcp2_pkt.h"
+#include "ngtcp2_net.h"
+#include "ngtcp2_unreachable.h"
+
+const uint8_t *ngtcp2_get_uint64(uint64_t *dest, const uint8_t *p) {
+ uint64_t n;
+ memcpy(&n, p, sizeof(n));
+ *dest = ngtcp2_ntohl64(n);
+ return p + sizeof(n);
+}
+
+const uint8_t *ngtcp2_get_uint48(uint64_t *dest, const uint8_t *p) {
+ uint64_t n = 0;
+ memcpy(((uint8_t *)&n) + 2, p, 6);
+ *dest = ngtcp2_ntohl64(n);
+ return p + 6;
+}
+
+const uint8_t *ngtcp2_get_uint32(uint32_t *dest, const uint8_t *p) {
+ uint32_t n;
+ memcpy(&n, p, sizeof(n));
+ *dest = ngtcp2_ntohl(n);
+ return p + sizeof(n);
+}
+
+const uint8_t *ngtcp2_get_uint24(uint32_t *dest, const uint8_t *p) {
+ uint32_t n = 0;
+ memcpy(((uint8_t *)&n) + 1, p, 3);
+ *dest = ngtcp2_ntohl(n);
+ return p + 3;
+}
+
+const uint8_t *ngtcp2_get_uint16(uint16_t *dest, const uint8_t *p) {
+ uint16_t n;
+ memcpy(&n, p, sizeof(n));
+ *dest = ngtcp2_ntohs(n);
+ return p + sizeof(n);
+}
+
+const uint8_t *ngtcp2_get_uint16be(uint16_t *dest, const uint8_t *p) {
+ memcpy(dest, p, sizeof(*dest));
+ return p + sizeof(*dest);
+}
+
+static uint64_t get_uvarint(size_t *plen, const uint8_t *p) {
+ union {
+ uint8_t n8;
+ uint16_t n16;
+ uint32_t n32;
+ uint64_t n64;
+ } n;
+
+ *plen = (size_t)(1u << (*p >> 6));
+
+ switch (*plen) {
+ case 1:
+ return *p;
+ case 2:
+ memcpy(&n, p, 2);
+ n.n8 &= 0x3f;
+ return ngtcp2_ntohs(n.n16);
+ case 4:
+ memcpy(&n, p, 4);
+ n.n8 &= 0x3f;
+ return ngtcp2_ntohl(n.n32);
+ case 8:
+ memcpy(&n, p, 8);
+ n.n8 &= 0x3f;
+ return ngtcp2_ntohl64(n.n64);
+ default:
+ ngtcp2_unreachable();
+ }
+}
+
+const uint8_t *ngtcp2_get_uvarint(uint64_t *dest, const uint8_t *p) {
+ size_t len;
+
+ *dest = get_uvarint(&len, p);
+
+ return p + len;
+}
+
+const uint8_t *ngtcp2_get_varint(int64_t *dest, const uint8_t *p) {
+ size_t len;
+
+ *dest = (int64_t)get_uvarint(&len, p);
+
+ return p + len;
+}
+
+int64_t ngtcp2_get_pkt_num(const uint8_t *p, size_t pkt_numlen) {
+ uint32_t l;
+ uint16_t s;
+
+ switch (pkt_numlen) {
+ case 1:
+ return *p;
+ case 2:
+ ngtcp2_get_uint16(&s, p);
+ return (int64_t)s;
+ case 3:
+ ngtcp2_get_uint24(&l, p);
+ return (int64_t)l;
+ case 4:
+ ngtcp2_get_uint32(&l, p);
+ return (int64_t)l;
+ default:
+ ngtcp2_unreachable();
+ }
+}
+
+uint8_t *ngtcp2_put_uint64be(uint8_t *p, uint64_t n) {
+ n = ngtcp2_htonl64(n);
+ return ngtcp2_cpymem(p, (const uint8_t *)&n, sizeof(n));
+}
+
+uint8_t *ngtcp2_put_uint48be(uint8_t *p, uint64_t n) {
+ n = ngtcp2_htonl64(n);
+ return ngtcp2_cpymem(p, ((const uint8_t *)&n) + 2, 6);
+}
+
+uint8_t *ngtcp2_put_uint32be(uint8_t *p, uint32_t n) {
+ n = ngtcp2_htonl(n);
+ return ngtcp2_cpymem(p, (const uint8_t *)&n, sizeof(n));
+}
+
+uint8_t *ngtcp2_put_uint24be(uint8_t *p, uint32_t n) {
+ n = ngtcp2_htonl(n);
+ return ngtcp2_cpymem(p, ((const uint8_t *)&n) + 1, 3);
+}
+
+uint8_t *ngtcp2_put_uint16be(uint8_t *p, uint16_t n) {
+ n = ngtcp2_htons(n);
+ return ngtcp2_cpymem(p, (const uint8_t *)&n, sizeof(n));
+}
+
+uint8_t *ngtcp2_put_uint16(uint8_t *p, uint16_t n) {
+ return ngtcp2_cpymem(p, (const uint8_t *)&n, sizeof(n));
+}
+
+uint8_t *ngtcp2_put_uvarint(uint8_t *p, uint64_t n) {
+ uint8_t *rv;
+ if (n < 64) {
+ *p++ = (uint8_t)n;
+ return p;
+ }
+ if (n < 16384) {
+ rv = ngtcp2_put_uint16be(p, (uint16_t)n);
+ *p |= 0x40;
+ return rv;
+ }
+ if (n < 1073741824) {
+ rv = ngtcp2_put_uint32be(p, (uint32_t)n);
+ *p |= 0x80;
+ return rv;
+ }
+ assert(n < 4611686018427387904ULL);
+ rv = ngtcp2_put_uint64be(p, n);
+ *p |= 0xc0;
+ return rv;
+}
+
+uint8_t *ngtcp2_put_uvarint30(uint8_t *p, uint32_t n) {
+ uint8_t *rv;
+
+ assert(n < 1073741824);
+
+ rv = ngtcp2_put_uint32be(p, n);
+ *p |= 0x80;
+
+ return rv;
+}
+
+uint8_t *ngtcp2_put_pkt_num(uint8_t *p, int64_t pkt_num, size_t len) {
+ switch (len) {
+ case 1:
+ *p++ = (uint8_t)pkt_num;
+ return p;
+ case 2:
+ ngtcp2_put_uint16be(p, (uint16_t)pkt_num);
+ return p + 2;
+ case 3:
+ ngtcp2_put_uint24be(p, (uint32_t)pkt_num);
+ return p + 3;
+ case 4:
+ ngtcp2_put_uint32be(p, (uint32_t)pkt_num);
+ return p + 4;
+ default:
+ ngtcp2_unreachable();
+ }
+}
+
+size_t ngtcp2_get_uvarintlen(const uint8_t *p) {
+ return (size_t)(1u << (*p >> 6));
+}
+
+size_t ngtcp2_put_uvarintlen(uint64_t n) {
+ if (n < 64) {
+ return 1;
+ }
+ if (n < 16384) {
+ return 2;
+ }
+ if (n < 1073741824) {
+ return 4;
+ }
+ assert(n < 4611686018427387904ULL);
+ return 8;
+}
+
+int64_t ngtcp2_nth_server_bidi_id(uint64_t n) {
+ if (n == 0) {
+ return 0;
+ }
+
+ if ((NGTCP2_MAX_VARINT >> 2) < n - 1) {
+ return NGTCP2_MAX_SERVER_STREAM_ID_BIDI;
+ }
+
+ return (int64_t)(((n - 1) << 2) | 0x01);
+}
+
+int64_t ngtcp2_nth_client_bidi_id(uint64_t n) {
+ if (n == 0) {
+ return 0;
+ }
+
+ if ((NGTCP2_MAX_VARINT >> 2) < n - 1) {
+ return NGTCP2_MAX_CLIENT_STREAM_ID_BIDI;
+ }
+
+ return (int64_t)((n - 1) << 2);
+}
+
+int64_t ngtcp2_nth_server_uni_id(uint64_t n) {
+ if (n == 0) {
+ return 0;
+ }
+
+ if ((NGTCP2_MAX_VARINT >> 2) < n - 1) {
+ return NGTCP2_MAX_SERVER_STREAM_ID_UNI;
+ }
+
+ return (int64_t)(((n - 1) << 2) | 0x03);
+}
+
+int64_t ngtcp2_nth_client_uni_id(uint64_t n) {
+ if (n == 0) {
+ return 0;
+ }
+
+ if ((NGTCP2_MAX_VARINT >> 2) < n - 1) {
+ return NGTCP2_MAX_CLIENT_STREAM_ID_UNI;
+ }
+
+ return (int64_t)(((n - 1) << 2) | 0x02);
+}
+
+uint64_t ngtcp2_ord_stream_id(int64_t stream_id) {
+ return (uint64_t)(stream_id >> 2) + 1;
+}
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