1 files changed, 221 insertions, 0 deletions
diff --git a/src/contrib/libngtcp2/ngtcp2/lib/ngtcp2_acktr.h b/src/contrib/libngtcp2/ngtcp2/lib/ngtcp2_acktr.h
new file mode 100644
index 0000000..70a3c71
--- /dev/null
+++ b/src/contrib/libngtcp2/ngtcp2/lib/ngtcp2_acktr.h
@@ -0,0 +1,221 @@
+/*
+ * 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_ACKTR_H
+#define NGTCP2_ACKTR_H
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif /* HAVE_CONFIG_H */
+
+#include <ngtcp2/ngtcp2.h>
+
+#include "ngtcp2_mem.h"
+#include "ngtcp2_ringbuf.h"
+#include "ngtcp2_ksl.h"
+#include "ngtcp2_pkt.h"
+#include "ngtcp2_objalloc.h"
+
+/* NGTCP2_ACKTR_MAX_ENT is the maximum number of ngtcp2_acktr_entry
+   which ngtcp2_acktr stores. */
+#define NGTCP2_ACKTR_MAX_ENT 1024
+
+typedef struct ngtcp2_log ngtcp2_log;
+
+/*
+ * ngtcp2_acktr_entry is a range of packets which need to be acked.
+ */
+typedef struct ngtcp2_acktr_entry {
+  union {
+    struct {
+      /* pkt_num is the largest packet number to acknowledge in this
+         range. */
+      int64_t pkt_num;
+      /* len is the consecutive packets started from pkt_num which
+         includes pkt_num itself counting in decreasing order.  So pkt_num
+         = 987 and len = 2, this entry includes packet 987 and 986. */
+      size_t len;
+      /* tstamp is the timestamp when a packet denoted by pkt_num is
+         received. */
+      ngtcp2_tstamp tstamp;
+    };
+
+    ngtcp2_opl_entry oplent;
+  };
+} ngtcp2_acktr_entry;
+
+ngtcp2_objalloc_def(acktr_entry, ngtcp2_acktr_entry, oplent);
+
+/*
+ * ngtcp2_acktr_entry_objalloc_new allocates memory for ent, and
+ * initializes it with the given parameters.  The pointer to the
+ * allocated object is stored to |*ent|.
+ *
+ * This function returns 0 if it succeeds, or one of the following
+ * negative error codes:
+ *
+ * NGTCP2_ERR_NOMEM
+ *     Out of memory.
+ */
+int ngtcp2_acktr_entry_objalloc_new(ngtcp2_acktr_entry **ent, int64_t pkt_num,
+                                    ngtcp2_tstamp tstamp,
+                                    ngtcp2_objalloc *objalloc);
+
+/*
+ * ngtcp2_acktr_entry_objalloc_del deallocates memory allocated for
+ * |ent|.
+ */
+void ngtcp2_acktr_entry_objalloc_del(ngtcp2_acktr_entry *ent,
+                                     ngtcp2_objalloc *objalloc);
+
+typedef struct ngtcp2_acktr_ack_entry {
+  /* largest_ack is the largest packet number in outgoing ACK frame */
+  int64_t largest_ack;
+  /* pkt_num is the packet number that ACK frame is included. */
+  int64_t pkt_num;
+} ngtcp2_acktr_ack_entry;
+
+/* NGTCP2_ACKTR_FLAG_NONE indicates that no flag set. */
+#define NGTCP2_ACKTR_FLAG_NONE 0x00u
+/* NGTCP2_ACKTR_FLAG_IMMEDIATE_ACK indicates that immediate
+   acknowledgement is required. */
+#define NGTCP2_ACKTR_FLAG_IMMEDIATE_ACK 0x01u
+/* NGTCP2_ACKTR_FLAG_ACTIVE_ACK indicates that there are pending
+   protected packet to be acknowledged. */
+#define NGTCP2_ACKTR_FLAG_ACTIVE_ACK 0x02u
+/* NGTCP2_ACKTR_FLAG_CANCEL_TIMER is set when ACK delay timer is
+   expired and canceled. */
+#define NGTCP2_ACKTR_FLAG_CANCEL_TIMER 0x0100u
+
+/*
+ * ngtcp2_acktr tracks received packets which we have to send ack.
+ */
+typedef struct ngtcp2_acktr {
+  ngtcp2_objalloc objalloc;
+  ngtcp2_ringbuf acks;
+  /* ents includes ngtcp2_acktr_entry sorted by decreasing order of
+     packet number. */
+  ngtcp2_ksl ents;
+  ngtcp2_log *log;
+  const ngtcp2_mem *mem;
+  /* flags is bitwise OR of zero, or more of NGTCP2_ACKTR_FLAG_*. */
+  uint16_t flags;
+  /* first_unacked_ts is timestamp when ngtcp2_acktr_entry is added
+     first time after the last outgoing ACK frame. */
+  ngtcp2_tstamp first_unacked_ts;
+  /* rx_npkt is the number of ACK eliciting packets received without
+     sending ACK. */
+  size_t rx_npkt;
+} ngtcp2_acktr;
+
+/*
+ * ngtcp2_acktr_init initializes |acktr|.
+ *
+ * This function returns 0 if it succeeds, or one of the following
+ * negative error codes:
+ *
+ * NGTCP2_ERR_NOMEM
+ *     Out of memory.
+ */
+int ngtcp2_acktr_init(ngtcp2_acktr *acktr, ngtcp2_log *log,
+                      const ngtcp2_mem *mem);
+
+/*
+ * ngtcp2_acktr_free frees resources allocated for |acktr|.  It frees
+ * any ngtcp2_acktr_entry added to |acktr|.
+ */
+void ngtcp2_acktr_free(ngtcp2_acktr *acktr);
+
+/*
+ * ngtcp2_acktr_add adds packet number |pkt_num| to |acktr|.
+ * |active_ack| is nonzero if |pkt_num| is retransmittable packet.
+ *
+ * This function assumes that |acktr| does not contain |pkt_num|.
+ *
+ * This function returns 0 if it succeeds, or one of the following
+ * negative error codes:
+ *
+ * NGTCP2_ERR_NOMEM
+ *     OUt of memory.
+ */
+int ngtcp2_acktr_add(ngtcp2_acktr *acktr, int64_t pkt_num, int active_ack,
+                     ngtcp2_tstamp ts);
+
+/*
+ * ngtcp2_acktr_forget removes all entries which have the packet
+ * number that is equal to or less than ent->pkt_num.  This function
+ * assumes that |acktr| includes |ent|.
+ */
+void ngtcp2_acktr_forget(ngtcp2_acktr *acktr, ngtcp2_acktr_entry *ent);
+
+/*
+ * ngtcp2_acktr_get returns the pointer to pointer to the entry which
+ * has the largest packet number to be acked.  If there is no entry,
+ * returned value satisfies ngtcp2_ksl_it_end(&it) != 0.
+ */
+ngtcp2_ksl_it ngtcp2_acktr_get(ngtcp2_acktr *acktr);
+
+/*
+ * ngtcp2_acktr_empty returns nonzero if it has no packet to
+ * acknowledge.
+ */
+int ngtcp2_acktr_empty(ngtcp2_acktr *acktr);
+
+/*
+ * ngtcp2_acktr_add_ack records outgoing ACK frame whose largest
+ * acknowledged packet number is |largest_ack|.  |pkt_num| is the
+ * packet number of a packet in which ACK frame is included.  This
+ * function returns a pointer to the object it adds.
+ */
+ngtcp2_acktr_ack_entry *
+ngtcp2_acktr_add_ack(ngtcp2_acktr *acktr, int64_t pkt_num, int64_t largest_ack);
+
+/*
+ * ngtcp2_acktr_recv_ack processes the incoming ACK frame |fr|.
+ * |pkt_num| is a packet number which includes |fr|.  If we receive
+ * ACK which acknowledges the ACKs added by ngtcp2_acktr_add_ack,
+ * ngtcp2_acktr_entry which the outgoing ACK acknowledges is removed.
+ */
+void ngtcp2_acktr_recv_ack(ngtcp2_acktr *acktr, const ngtcp2_ack *fr);
+
+/*
+ * ngtcp2_acktr_commit_ack tells |acktr| that ACK frame is generated.
+ */
+void ngtcp2_acktr_commit_ack(ngtcp2_acktr *acktr);
+
+/*
+ * ngtcp2_acktr_require_active_ack returns nonzero if ACK frame should
+ * be generated actively.
+ */
+int ngtcp2_acktr_require_active_ack(ngtcp2_acktr *acktr,
+                                    ngtcp2_duration max_ack_delay,
+                                    ngtcp2_tstamp ts);
+
+/*
+ * ngtcp2_acktr_immediate_ack tells |acktr| that immediate
+ * acknowledgement is required.
+ */
+void ngtcp2_acktr_immediate_ack(ngtcp2_acktr *acktr);
+
+#endif /* NGTCP2_ACKTR_H */