1 files changed, 208 insertions, 0 deletions
diff --git a/lib/ngtcp2_conv.h b/lib/ngtcp2_conv.h
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+++ b/lib/ngtcp2_conv.h
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+/*
+ * 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.
+ */
+#ifndef NGTCP2_CONV_H
+#define NGTCP2_CONV_H
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif /* HAVE_CONFIG_H */
+
+#include <ngtcp2/ngtcp2.h>
+
+/*
+ * ngtcp2_get_uint64 reads 8 bytes from |p| as 64 bits unsigned
+ * integer encoded as network byte order, and stores it in the buffer
+ * pointed by |dest| in host byte order.  It returns |p| + 8.
+ */
+const uint8_t *ngtcp2_get_uint64(uint64_t *dest, const uint8_t *p);
+
+/*
+ * ngtcp2_get_uint48 reads 6 bytes from |p| as 48 bits unsigned
+ * integer encoded as network byte order, and stores it in the buffer
+ * pointed by |dest| in host byte order.  It returns |p| + 6.
+ */
+const uint8_t *ngtcp2_get_uint48(uint64_t *dest, const uint8_t *p);
+
+/*
+ * ngtcp2_get_uint32 reads 4 bytes from |p| as 32 bits unsigned
+ * integer encoded as network byte order, and stores it in the buffer
+ * pointed by |dest| in host byte order.  It returns |p| + 4.
+ */
+const uint8_t *ngtcp2_get_uint32(uint32_t *dest, const uint8_t *p);
+
+/*
+ * ngtcp2_get_uint24 reads 3 bytes from |p| as 24 bits unsigned
+ * integer encoded as network byte order, and stores it in the buffer
+ * pointed by |dest| in host byte order.  It returns |p| + 3.
+ */
+const uint8_t *ngtcp2_get_uint24(uint32_t *dest, const uint8_t *p);
+
+/*
+ * ngtcp2_get_uint16 reads 2 bytes from |p| as 16 bits unsigned
+ * integer encoded as network byte order, and stores it in the buffer
+ * pointed by |dest| in host byte order.  It returns |p| + 2.
+ */
+const uint8_t *ngtcp2_get_uint16(uint16_t *dest, const uint8_t *p);
+
+/*
+ * ngtcp2_get_uint16be reads 2 bytes from |p| as 16 bits unsigned
+ * integer encoded as network byte order, and stores it in the buffer
+ * pointed by |dest| as is.  It returns |p| + 2.
+ */
+const uint8_t *ngtcp2_get_uint16be(uint16_t *dest, const uint8_t *p);
+
+/*
+ * ngtcp2_get_uvarint reads variable-length unsigned integer from |p|,
+ * and stores it in the buffer pointed by |dest| in host byte order.
+ * It returns |p| plus the number of bytes read from |p|.
+ */
+const uint8_t *ngtcp2_get_uvarint(uint64_t *dest, const uint8_t *p);
+
+/*
+ * ngtcp2_get_varint reads variable-length unsigned integer from |p|,
+ * and casts it to the signed integer, and stores it in the buffer
+ * pointed by |dest| in host byte order.  No information should be
+ * lost in this cast, because the variable-length integer is 62
+ * bits. It returns |p| plus the number of bytes read from |p|.
+ */
+const uint8_t *ngtcp2_get_varint(int64_t *dest, const uint8_t *p);
+
+/*
+ * ngtcp2_get_pkt_num reads encoded packet number from |p|.  The
+ * packet number is encoed in |pkt_numlen| bytes.
+ */
+int64_t ngtcp2_get_pkt_num(const uint8_t *p, size_t pkt_numlen);
+
+/*
+ * ngtcp2_put_uint64be writes |n| in host byte order in |p| in network
+ * byte order.  It returns the one beyond of the last written
+ * position.
+ */
+uint8_t *ngtcp2_put_uint64be(uint8_t *p, uint64_t n);
+
+/*
+ * ngtcp2_put_uint48be writes |n| in host byte order in |p| in network
+ * byte order.  It writes only least significant 48 bits.  It returns
+ * the one beyond of the last written position.
+ */
+uint8_t *ngtcp2_put_uint48be(uint8_t *p, uint64_t n);
+
+/*
+ * ngtcp2_put_uint32be writes |n| in host byte order in |p| in network
+ * byte order.  It returns the one beyond of the last written
+ * position.
+ */
+uint8_t *ngtcp2_put_uint32be(uint8_t *p, uint32_t n);
+
+/*
+ * ngtcp2_put_uint24be writes |n| in host byte order in |p| in network
+ * byte order.  It writes only least significant 24 bits.  It returns
+ * the one beyond of the last written position.
+ */
+uint8_t *ngtcp2_put_uint24be(uint8_t *p, uint32_t n);
+
+/*
+ * ngtcp2_put_uint16be writes |n| in host byte order in |p| in network
+ * byte order.  It returns the one beyond of the last written
+ * position.
+ */
+uint8_t *ngtcp2_put_uint16be(uint8_t *p, uint16_t n);
+
+/*
+ * ngtcp2_put_uint16 writes |n| as is in |p|.  It returns the one
+ * beyond of the last written position.
+ */
+uint8_t *ngtcp2_put_uint16(uint8_t *p, uint16_t n);
+
+/*
+ * ngtcp2_put_uvarint writes |n| in |p| using variable-length integer
+ * encoding.  It returns the one beyond of the last written position.
+ */
+uint8_t *ngtcp2_put_uvarint(uint8_t *p, uint64_t n);
+
+/*
+ * ngtcp2_put_uvarint30 writes |n| in |p| using variable-length
+ * integer encoding.  |n| must be strictly less than 1073741824.  The
+ * function always encodes |n| in 4 bytes.  It returns the one beyond
+ * of the last written position.
+ */
+uint8_t *ngtcp2_put_uvarint30(uint8_t *p, uint32_t n);
+
+/*
+ * ngtcp2_put_pkt_num encodes |pkt_num| using |len| bytes.  It
+ * returns the one beyond of the last written position.
+ */
+uint8_t *ngtcp2_put_pkt_num(uint8_t *p, int64_t pkt_num, size_t len);
+
+/*
+ * ngtcp2_get_uvarintlen returns the required number of bytes to read
+ * variable-length integer starting at |p|.
+ */
+size_t ngtcp2_get_uvarintlen(const uint8_t *p);
+
+/*
+ * ngtcp2_put_uvarintlen returns the required number of bytes to
+ * encode |n|.
+ */
+size_t ngtcp2_put_uvarintlen(uint64_t n);
+
+/*
+ * ngtcp2_nth_server_bidi_id returns |n|-th server bidirectional
+ * stream ID.  If |n| is 0, it returns 0.  If the |n|-th stream ID is
+ * larger than NGTCP2_MAX_SERVER_STREAM_ID_BIDI, this function returns
+ * NGTCP2_MAX_SERVER_STREAM_ID_BIDI.
+ */
+int64_t ngtcp2_nth_server_bidi_id(uint64_t n);
+
+/*
+ * ngtcp2_nth_client_bidi_id returns |n|-th client bidirectional
+ * stream ID.  If |n| is 0, it returns 0.  If the |n|-th stream ID is
+ * larger than NGTCP2_MAX_CLIENT_STREAM_ID_BIDI, this function returns
+ * NGTCP2_MAX_CLIENT_STREAM_ID_BIDI.
+ */
+int64_t ngtcp2_nth_client_bidi_id(uint64_t n);
+
+/*
+ * ngtcp2_nth_server_uni_id returns |n|-th server unidirectional
+ * stream ID.  If |n| is 0, it returns 0.  If the |n|-th stream ID is
+ * larger than NGTCP2_MAX_SERVER_STREAM_ID_UNI, this function returns
+ * NGTCP2_MAX_SERVER_STREAM_ID_UNI.
+ */
+int64_t ngtcp2_nth_server_uni_id(uint64_t n);
+
+/*
+ * ngtcp2_nth_client_uni_id returns |n|-th client unidirectional
+ * stream ID.  If |n| is 0, it returns 0.  If the |n|-th stream ID is
+ * larger than NGTCP2_MAX_CLIENT_STREAM_ID_UNI, this function returns
+ * NGTCP2_MAX_CLIENT_STREAM_ID_UNI.
+ */
+int64_t ngtcp2_nth_client_uni_id(uint64_t n);
+
+/*
+ * ngtcp2_ord_stream_id returns the ordinal number of |stream_id|.
+ */
+uint64_t ngtcp2_ord_stream_id(int64_t stream_id);
+
+#endif /* NGTCP2_CONV_H */