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litespeed-quic/src/liblsquic/lsquic_parse_gquic_be.c

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/* Copyright (c) 2017 LiteSpeed Technologies Inc. See LICENSE. */
/*
* lsquic_parse_gquic_be.c -- Parsing functions specific to big-endian
* (Q039 and higher) GQUIC.
*/
#include <assert.h>
#include <inttypes.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <sys/queue.h>
#include <sys/types.h>
#include "lsquic_types.h"
#include "lsquic_alarmset.h"
#include "lsquic_packet_common.h"
#include "lsquic_packet_in.h"
#include "lsquic_parse.h"
#include "lsquic_rechist.h"
#include "lsquic_sfcw.h"
#include "lsquic_stream.h"
#include "lsquic_mm.h"
#include "lsquic_malo.h"
#include "lsquic_version.h"
#include "lsquic.h"
#include "lsquic_parse_gquic_be.h" /* Include to catch mismatches */
#define LSQUIC_LOGGER_MODULE LSQLM_PARSE
#include "lsquic_logger.h"
/* read 16 bits(2 bytes) time, unit: us */
uint64_t
gquic_be_read_float_time16 (const void *mem)
{
uint16_t val;
READ_UINT(val, 16, mem, 2);
uint64_t temp = val;
uint16_t exp = (temp >> 11) & 0x1F;
if (0 == exp)
return temp;
else
{
--exp;
temp &= 0x7FF;
temp |= 0x800;
return temp << exp;
}
}
void
gquic_be_write_float_time16 (lsquic_time_t time_us, void *mem)
{
uint16_t ret = 0;
uint16_t high, i;
if (time_us < ((uint64_t)1 << 11))
ret = time_us;
else if(time_us > 0x3FFC0000000)
ret = 0xFFFF;
else
{
high = 0;
for (i = 16; i > 0; i /= 2)
{
if (time_us >= (uint64_t)1 << (11 + i))
{
high |= i;
time_us >>= i;
}
}
ret = time_us + (high << 11);
}
#if __BYTE_ORDER == __LITTLE_ENDIAN
ret = bswap_16(ret);
#endif
memcpy(mem, (void *)&ret, 2);
}
/* Parse out packet number */
void
gquic_be_parse_packet_in_finish (lsquic_packet_in_t *packet_in,
struct packin_parse_state *state)
{
lsquic_packno_t packno;
if (state->pps_nbytes)
{
READ_UINT(packno, 64, state->pps_p, state->pps_nbytes);
packet_in->pi_packno = packno;
}
}
int
gquic_be_gen_ver_nego_pkt (unsigned char *buf, size_t bufsz, uint64_t conn_id,
unsigned version_bitmask)
{
int sz;
unsigned char *p = buf;
unsigned char *const pend = p + bufsz;
CHECK_SPACE(1, p, pend);
*p = PACKET_PUBLIC_FLAGS_VERSION | PACKET_PUBLIC_FLAGS_8BYTE_CONNECTION_ID;
++p;
CHECK_SPACE(8, p, pend);
memcpy(p, &conn_id, 8);
p += 8;
sz = gen_ver_tags(p, pend - p, version_bitmask);
if (sz < 0)
return -1;
return p + sz - buf;
}
int
gquic_be_gen_reg_pkt_header (unsigned char *buf, size_t bufsz, const lsquic_cid_t *conn_id,
const lsquic_ver_tag_t *ver, const unsigned char *nonce,
lsquic_packno_t packno, enum lsquic_packno_bits bits)
{
unsigned packnum_len, header_len;
unsigned char *p;
packnum_len = packno_bits2len(bits);
header_len = 1 + (!!conn_id << 3) + (!!ver << 2) + ((!!nonce) << 5)
+ packnum_len;
if (header_len > bufsz)
{
errno = ENOBUFS;
return -1;
}
p = buf;
*p = (!!conn_id << 3)
| (bits << 4)
| ((!!nonce) << 2)
| !!ver;
++p;
if (conn_id)
{
memcpy(p, conn_id , sizeof(*conn_id));
p += sizeof(*conn_id);
}
if (ver)
{
memcpy(p, ver, 4);
p += 4;
}
if (nonce)
{
memcpy(p, nonce , 32);
p += 32;
}
#if __BYTE_ORDER == __LITTLE_ENDIAN
packno = bswap_64(packno);
#endif
memcpy(p, (unsigned char *) &packno + 8 - packnum_len, packnum_len);
p += packnum_len;
assert(p - buf == (intptr_t) header_len);
return header_len;
}
int
gquic_be_gen_stream_frame (unsigned char *buf, size_t buf_len, uint32_t stream_id,
uint64_t offset, gsf_fin_f gsf_fin, gsf_size_f gsf_size,
gsf_read_f gsf_read, void *stream)
{
/* 1fdoooss */
unsigned slen, olen, dlen;
unsigned char *p = buf + 1;
int fin;
/* ss: Stream ID length: 1, 2, 3, or 4 bytes */
slen = (stream_id > 0x0000FF)
+ (stream_id > 0x00FFFF)
+ (stream_id > 0xFFFFFF)
+ 1;
/* ooo: Offset length: 0, 2, 3, 4, 5, 6, 7, or 8 bytes */
olen = (offset >= (1ULL << 56))
+ (offset >= (1ULL << 48))
+ (offset >= (1ULL << 40))
+ (offset >= (1ULL << 32))
+ (offset >= (1ULL << 24))
+ (offset >= (1ULL << 16))
+ ((offset > 0) << 1);
fin = gsf_fin(stream);
if (!fin)
{
unsigned size, n_avail;
uint16_t nr;
size = gsf_size(stream);
n_avail = buf_len - (p + slen + olen - buf);
/* If we cannot fill remaining buffer, we need to include data
* length.
*/
dlen = (size < n_avail) << 1;
n_avail -= dlen;
CHECK_SPACE(1 + olen + slen + dlen +
+ 1 /* We need to write at least 1 byte */, buf, buf + buf_len);
#if __BYTE_ORDER == __LITTLE_ENDIAN
stream_id = bswap_32(stream_id);
#endif
memcpy(p, (unsigned char *) &stream_id + 4 - slen, slen);
p += slen;
#if __BYTE_ORDER == __LITTLE_ENDIAN
offset = bswap_64(offset);
#endif
memcpy(p, (unsigned char *) &offset + 8 - olen, olen);
p += olen;
/* Read as much as we can */
nr = gsf_read(stream, p + dlen, n_avail, &fin);
assert(nr != 0);
if (dlen)
{
uint16_t nr_copy = nr;
#if __BYTE_ORDER == __LITTLE_ENDIAN
nr_copy = bswap_16(nr_copy);
#endif
memcpy(p, &nr_copy, 2);
}
p += dlen + nr;
}
else
{
dlen = 2;
CHECK_SPACE(1 + slen + olen + 2, buf, buf + buf_len);
#if __BYTE_ORDER == __LITTLE_ENDIAN
stream_id = bswap_32(stream_id);
#endif
memcpy(p, (unsigned char *) &stream_id + 4 - slen, slen);
p += slen;
#if __BYTE_ORDER == __LITTLE_ENDIAN
offset = bswap_64(offset);
#endif
memcpy(p, (unsigned char *) &offset + 8 - olen, olen);
p += olen;
memset(p, 0, 2);
p += 2;
}
/* Convert slen to bit representation: 0 - 3: */
slen -= 1;
assert(slen <= 3);
/* Convert olen to bit representation: 0 - 7: */
olen += !olen;
olen -= 1;
assert(olen <= 7);
buf[0] = 0x80
| (fin << 6)
| (dlen << 4)
| (olen << 2)
| slen
;
return p - buf;
}
/* return parsed (used) buffer length */
int
gquic_be_parse_stream_frame (const unsigned char *buf, size_t rem_packet_sz,
stream_frame_t *stream_frame)
{
/* 1fdoooss */
const unsigned char *p = buf;
const unsigned char *const pend = p + rem_packet_sz;
CHECK_SPACE(1, p, pend);
const char type = *p++;
const unsigned data_len = (type >> 4) & 2;
const unsigned offset_len = ((type >> 2) & 7) + 1 - !((type >> 2) & 7);
const unsigned stream_id_len = 1 + (type & 3);
const unsigned need = data_len + offset_len + stream_id_len;
CHECK_SPACE(need, p, pend);
memset(stream_frame, 0, sizeof(*stream_frame));
stream_frame->data_frame.df_fin = (type >> 6) & 1;
memcpy((unsigned char *) &stream_frame->stream_id + 4 - stream_id_len, p,
stream_id_len);
#if __BYTE_ORDER == __LITTLE_ENDIAN
stream_frame->stream_id = bswap_32(stream_frame->stream_id);
#endif
p += stream_id_len;
memcpy((unsigned char *) &stream_frame->data_frame.df_offset
+ 8 - offset_len, p, offset_len);
#if __BYTE_ORDER == __LITTLE_ENDIAN
stream_frame->data_frame.df_offset =
bswap_64(stream_frame->data_frame.df_offset);
#endif
p += offset_len;
if (data_len)
{
memcpy(&stream_frame->data_frame.df_size, p, data_len);
#if __BYTE_ORDER == __LITTLE_ENDIAN
stream_frame->data_frame.df_size =
bswap_16(stream_frame->data_frame.df_size);
#endif
p += data_len;
CHECK_SPACE(stream_frame->data_frame.df_size, p, pend);
stream_frame->data_frame.df_data = p;
p += stream_frame->data_frame.df_size;
}
else
{
stream_frame->data_frame.df_size = pend - p;
stream_frame->data_frame.df_data = p;
p = pend;
}
/* From the spec: "A stream frame must always have either non-zero
* data length or the FIN bit set.'
*/
if (!(stream_frame->data_frame.df_size ||
stream_frame->data_frame.df_fin))
return -1;
assert(p <= pend);
return p - (unsigned char *) buf;
}
/* This is a special function: it is used to extract the largest observed
* packet number from ACK frame that we ourselves generated. This allows
* us to skip some checks.
*/
lsquic_packno_t
gquic_be_parse_ack_high (const unsigned char *buf, size_t buf_len)
{
unsigned char type;
unsigned largest_obs_len;
lsquic_packno_t packno;
type = buf[0];
largest_obs_len = twobit_to_1246((type >> 2) & 3);
assert(parse_frame_type_gquic_Q035_thru_Q039(type) == QUIC_FRAME_ACK);
assert(buf_len >= 1 + largest_obs_len);
READ_UINT(packno, 64, buf + 1, largest_obs_len);
return packno;
}
/* Return parsed (used) buffer length.
* If parsing failed, negative value is returned.
*/
int
gquic_be_parse_ack_frame (const unsigned char *buf, size_t buf_len, ack_info_t *ack)
{
/* 01nullmm */
lsquic_packno_t tmp_packno;
const unsigned char type = buf[0];
const unsigned char *p = buf + 1;
const unsigned char *const pend = buf + buf_len;
assert((type & 0xC0) == 0x40); /* We're passed correct frame type */
const int ack_block_len = twobit_to_1246(type & 3); /* mm */
const int largest_obs_len = twobit_to_1246((type >> 2) & 3); /* ll */
CHECK_SPACE(largest_obs_len, p , pend);
READ_UINT(ack->ranges[0].high, 64, p, largest_obs_len);
p += largest_obs_len;
CHECK_SPACE(2, p , pend);
ack->lack_delta = gquic_be_read_float_time16(p);
p += 2;
unsigned n_blocks;
if (type & 0x20)
{
CHECK_SPACE(1, p , pend);
n_blocks = *p;
++p;
}
else
n_blocks = 0;
CHECK_SPACE(ack_block_len, p , pend);
READ_UINT(tmp_packno, 64, p, ack_block_len);
ack->ranges[0].low = ack->ranges[0].high - tmp_packno + 1;
p += ack_block_len;
if (n_blocks)
{
CHECK_SPACE((ack_block_len + 1) * n_blocks, p , pend);
unsigned i, n, gap;
for (i = 0, n = 1, gap = 0; i < n_blocks; ++i)
{
uint64_t length;
gap += *p;
READ_UINT(length, 64, p + 1, ack_block_len);
p += 1 + ack_block_len;
if (length)
{
ack->ranges[n].high = ack->ranges[n - 1].low - gap - 1;
ack->ranges[n].low = ack->ranges[n].high - length + 1;
++n;
gap = 0;
}
}
ack->n_ranges = n;
}
else
ack->n_ranges = 1;
CHECK_SPACE(1, p , pend);
ack->n_timestamps = *p;
++p;
if (ack->n_timestamps)
{
#if LSQUIC_PARSE_ACK_TIMESTAMPS
CHECK_SPACE(5, p , pend);
ack->timestamps[0].packet_delta = *p++;
memcpy(&ack->timestamps[0].delta_usec, p, 4);
p += 4;
unsigned i;
for (i = 1; i < ack->n_timestamps; ++i)
{
CHECK_SPACE(3, p , pend);
ack->timestamps[i].packet_delta = *p++;
uint64_t delta_time = read_float_time16(p);
p += 2;
ack->timestamps[i].delta_usec =
ack->timestamps[i - 1].delta_usec + delta_time;
}
#else
unsigned timestamps_size = 5 + 3 * (ack->n_timestamps - 1);
CHECK_SPACE(timestamps_size, p, pend);
p += timestamps_size;
#endif
}
assert(p <= pend);
return p - (unsigned char *) buf;
}
int
gquic_be_gen_stop_waiting_frame(unsigned char *buf, size_t buf_len,
lsquic_packno_t cur_packno, enum lsquic_packno_bits bits,
lsquic_packno_t least_unacked_packno)
{
lsquic_packno_t delta;
unsigned packnum_len = packno_bits2len(bits);
if (buf_len >= 1 + packnum_len)
{
*buf = 0x06;
delta = cur_packno - least_unacked_packno;
#if __BYTE_ORDER == __LITTLE_ENDIAN
delta = bswap_64(delta);
#endif
memcpy(buf + 1, (unsigned char *) &delta + 8 - packnum_len,
packnum_len);
return 1 + packnum_len;
}
else
return -1;
}
int
gquic_be_parse_stop_waiting_frame (const unsigned char *buf, size_t buf_len,
lsquic_packno_t cur_packno, enum lsquic_packno_bits bits,
lsquic_packno_t *least_unacked)
{
lsquic_packno_t delta;
unsigned packnum_len = packno_bits2len(bits);
if (buf_len >= 1 + packnum_len)
{
READ_UINT(delta, 64, buf + 1, packnum_len);
*least_unacked = cur_packno - delta;
return 1 + packnum_len;
}
else
return -1;
}
int
gquic_be_skip_stop_waiting_frame (size_t buf_len, enum lsquic_packno_bits bits)
{
unsigned packnum_len = packno_bits2len(bits);
if (buf_len >= 1 + packnum_len)
return 1 + packnum_len;
else
return -1;
}
int
gquic_be_gen_window_update_frame (unsigned char *buf, int buf_len, uint32_t stream_id,
uint64_t offset)
{
if (buf_len < QUIC_WUF_SZ)
return -1;
*buf = 0x04;
#if __BYTE_ORDER == __LITTLE_ENDIAN
stream_id = bswap_32(stream_id);
#endif
memcpy(buf + 1, (unsigned char *) &stream_id, 4);
#if __BYTE_ORDER == __LITTLE_ENDIAN
offset = bswap_64(offset);
#endif
memcpy(buf + 1 + 4, (unsigned char *) &offset, 8);
return QUIC_WUF_SZ;
}
int
gquic_be_parse_window_update_frame (const unsigned char *buf, size_t buf_len,
uint32_t *stream_id, uint64_t *offset)
{
if (buf_len < QUIC_WUF_SZ)
return -1;
READ_UINT(*stream_id, 32, buf + 1, 4);
READ_UINT(*offset, 64, buf + 1 + 4, 8);
return QUIC_WUF_SZ;
}
int
gquic_be_gen_blocked_frame (unsigned char *buf, size_t buf_len, uint32_t stream_id)
{
if (buf_len < QUIC_BLOCKED_FRAME_SZ)
return -1;
*buf = 0x05;
#if __BYTE_ORDER == __LITTLE_ENDIAN
stream_id = bswap_32(stream_id);
#endif
memcpy(buf + 1, &stream_id, 4);
return QUIC_BLOCKED_FRAME_SZ;
}
int
gquic_be_parse_blocked_frame (const unsigned char *buf, size_t buf_len,
uint32_t *stream_id)
{
if (buf_len < QUIC_BLOCKED_FRAME_SZ)
return -1;
READ_UINT(*stream_id, 32, buf + 1, 4);
return QUIC_BLOCKED_FRAME_SZ;
}
int
gquic_be_gen_rst_frame (unsigned char *buf, size_t buf_len, uint32_t stream_id,
uint64_t offset, uint32_t error_code)
{
unsigned char *p = buf;
if (buf_len < QUIC_RST_STREAM_SZ)
return -1;
*p = 0x01;
++p;
#if __BYTE_ORDER == __LITTLE_ENDIAN
stream_id = bswap_32(stream_id);
#endif
memcpy(p, &stream_id, 4);
p += 4;
#if __BYTE_ORDER == __LITTLE_ENDIAN
offset = bswap_64(offset);
#endif
memcpy(p, &offset, 8);
p += 8;
#if __BYTE_ORDER == __LITTLE_ENDIAN
error_code = bswap_32(error_code);
#endif
memcpy(p, &error_code, 4);
p += 4;
return p - buf;
}
int
gquic_be_parse_rst_frame (const unsigned char *buf, size_t buf_len, uint32_t *stream_id,
uint64_t *offset, uint32_t *error_code)
{
if (buf_len < QUIC_RST_STREAM_SZ)
return -1;
READ_UINT(*stream_id, 32, buf + 1, 4);
READ_UINT(*offset, 64, buf + 1 + 4, 8);
READ_UINT(*error_code, 32, buf + 1 + 4 + 8, 4);
return QUIC_RST_STREAM_SZ;
}
int
gquic_be_gen_ping_frame (unsigned char *buf, int buf_len)
{
if (buf_len > 0)
{
buf[0] = 0x07;
return 1;
}
else
return -1;
}
int
gquic_be_gen_connect_close_frame (unsigned char *buf, int buf_len, uint32_t error_code,
const char *reason, int reason_len)
{
unsigned char *p = buf;
if (buf_len < 7)
return -1;
*p = 0x02;
++p;
#if __BYTE_ORDER == __LITTLE_ENDIAN
error_code = bswap_32(error_code);
#endif
memcpy(p, &error_code, 4);
p += 4;
#if __BYTE_ORDER == __LITTLE_ENDIAN
const uint16_t copy = bswap_16(reason_len);
memcpy(p, &copy, 2);
#else
memcpy(p, &reason_len, 2);
#endif
p += 2;
memcpy(p, reason, reason_len);
p += reason_len;
if (buf_len < p - buf)
return -2;
return p - buf;
}
int
gquic_be_parse_connect_close_frame (const unsigned char *buf, size_t buf_len,
uint32_t *error_code, uint16_t *reason_len, uint8_t *reason_offset)
{
if (buf_len < 7)
return -1;
READ_UINT(*error_code, 32, buf + 1, 4);
READ_UINT(*reason_len, 16, buf + 1 + 4, 2);
*reason_offset = 7;
if (buf_len < 7u + *reason_len)
return -2;
return 7 + *reason_len;
}
int
gquic_be_gen_goaway_frame(unsigned char *buf, size_t buf_len, uint32_t error_code,
uint32_t last_good_stream_id, const char *reason,
size_t reason_len)
{
unsigned char *p = buf;
if (buf_len < QUIC_GOAWAY_FRAME_SZ + reason_len)
return -1;
*p = 0x03;
++p;
#if __BYTE_ORDER == __LITTLE_ENDIAN
error_code = bswap_32(error_code);
#endif
memcpy(p, &error_code, 4);
p += 4;
#if __BYTE_ORDER == __LITTLE_ENDIAN
last_good_stream_id = bswap_32(last_good_stream_id);
#endif
memcpy(p, &last_good_stream_id, 4);
p += 4;
#if __BYTE_ORDER == __LITTLE_ENDIAN
uint16_t copy = bswap_16(reason_len);
memcpy(p, &copy, 2);
#else
memcpy(p, &reason_len, 2);
#endif
p += 2;
if (reason_len)
{
memcpy(p, reason, reason_len);
p += reason_len;
}
return p - buf;
}
/* the reason is buf + *reason_offset, length is *reason_length */
int
gquic_be_parse_goaway_frame (const unsigned char *buf, size_t buf_len,
uint32_t *error_code, uint32_t *last_good_stream_id,
uint16_t *reason_length, const char **reason)
{
if (buf_len < QUIC_GOAWAY_FRAME_SZ)
return -1;
READ_UINT(*error_code, 32, buf + 1, 4);
READ_UINT(*last_good_stream_id, 32, buf + 1 + 4, 4);
READ_UINT(*reason_length, 16, buf + 1 + 4 + 4, 2);
if (*reason_length)
{
if ((int)buf_len < QUIC_GOAWAY_FRAME_SZ + *reason_length)
return -2;
*reason = (const char *) buf + QUIC_GOAWAY_FRAME_SZ;
}
else
*reason = NULL;
return QUIC_GOAWAY_FRAME_SZ + *reason_length;
}
/* Returns number of bytes written or -1 on failure */
/* This function makes an assumption that there is at least one range */
int
gquic_be_gen_ack_frame (unsigned char *outbuf, size_t outbuf_sz,
gaf_rechist_first_f rechist_first, gaf_rechist_next_f rechist_next,
gaf_rechist_largest_recv_f rechist_largest_recv,
void *rechist, lsquic_time_t now, int *has_missing)
{
lsquic_packno_t tmp_packno;
const struct lsquic_packno_range *const first = rechist_first(rechist);
if (!first)
{
errno = EINVAL;
return -1;
}
/* Copy values from the first range, because the memory the pointer
* points to may change:
*/
const lsquic_packno_t first_low = first->low, first_high = first->high;
unsigned char *p = outbuf;
unsigned char *const type = p;
unsigned char *const end = p + outbuf_sz;
#define AVAIL() (end - p)
#define CHECKOUT(sz) do { \
if ((intptr_t) (sz) > AVAIL()) { \
errno = ENOBUFS; \
return -1; \
} \
} while (0)
CHECKOUT(1);
++p;
/* 01nullmm */
*type = 0x40;
unsigned largest_acked_len, ack_block_len, bits;
/* Calculate largest ACKed len and set `ll' bits: */
const lsquic_packno_t maxno = first_high;
bits = (maxno >= (1ULL << 8))
+ (maxno >= (1ULL << 16))
+ (maxno >= (1ULL << 32));
largest_acked_len = (1 << bits) - ((maxno >= (1ULL << 32)) << 1);
*type |= bits << 2;
/* Calculate largest ACK block length and set `mm' bits: */
unsigned n_ranges = 0;
lsquic_packno_t maxdiff = 0;
const struct lsquic_packno_range *range;
for (range = rechist_first(rechist); range; range = rechist_next(rechist))
{
++n_ranges;
const lsquic_packno_t diff = range->high - range->low + 1;
if (diff > maxdiff)
maxdiff = diff;
}
bits = (maxdiff >= (1ULL << 8))
+ (maxdiff >= (1ULL << 16))
+ (maxdiff >= (1ULL << 32));
ack_block_len = (1 << bits) - ((maxdiff >= (1ULL << 32)) << 1);
*type |= bits;
CHECKOUT(largest_acked_len);
tmp_packno = maxno;
#if __BYTE_ORDER == __LITTLE_ENDIAN
tmp_packno = bswap_64(maxno);
#endif
memcpy(p, (unsigned char *) &tmp_packno + 8 - largest_acked_len,
largest_acked_len);
p += largest_acked_len;
CHECKOUT(2);
lsquic_time_t diff = now - rechist_largest_recv(rechist);
gquic_be_write_float_time16(diff, p);
LSQ_DEBUG("%s: diff: %"PRIu64"; encoded: 0x%04X", __func__, diff,
*(uint16_t*)p);
p += 2;
if (n_ranges > 1)
{
*has_missing = 1;
*type |= 0x20;
/* We need to write out at least one range */
CHECKOUT(2 * (1 + ack_block_len));
unsigned char *const n_ranges_p = p; /* Set this later */
lsquic_packno_t diff = maxno - first_low + 1;
#if __BYTE_ORDER == __LITTLE_ENDIAN
diff = bswap_64(diff);
#endif
memcpy(p + 1, (unsigned char *) &diff + 8 - ack_block_len,
ack_block_len);
p += ack_block_len + 1;
/* Write out ack blocks until one of the following occurs:
* 1. We run out of intervals.
* 2. We run out of room.
* 3. We run out of highest possible number of ACK blocks (0xFF).
*/
range = rechist_first(rechist);
lsquic_packno_t gap = 0;
n_ranges = 0;
do {
if (0 == gap)
{
const lsquic_packno_t prev_low = range->low;
range = rechist_next(rechist);
if (!range)
break;
gap = prev_low - range->high - 1;
}
if (gap >= 0x100)
{
*p = 0xFF;
gap -= 0xFF;
memset(p + 1, 0, ack_block_len);
}
else
{
*p = gap;
gap = 0;
diff = range->high - range->low + 1;
#if __BYTE_ORDER == __LITTLE_ENDIAN
diff = bswap_64(diff);
#endif
memcpy(p + 1, (unsigned char *) &diff + 8 - ack_block_len,
ack_block_len);
}
p += ack_block_len + 1;
++n_ranges;
} while (n_ranges < 0xFF &&
AVAIL() >= (intptr_t) ack_block_len + 1 + 1 /* timestamp byte */);
*n_ranges_p = n_ranges;
}
else
{
*has_missing = 0;
CHECKOUT(ack_block_len);
lsquic_packno_t diff = maxno - first_low + 1;
#if __BYTE_ORDER == __LITTLE_ENDIAN
diff = bswap_64(diff);
#endif
memcpy(p, (unsigned char *) &diff + 8 - ack_block_len, ack_block_len);
p += ack_block_len;
}
/* We do not generate timestamp list because the reference implementation
* does not use them. When that changes, we will start sending timestamps
* over.
*/
CHECKOUT(1);
*p = 0;
++p;
return p - (unsigned char *) outbuf;
#undef CHECKOUT
}
const struct parse_funcs lsquic_parse_funcs_gquic_Q039 =
{
.pf_gen_ver_nego_pkt = gquic_be_gen_ver_nego_pkt,
.pf_gen_reg_pkt_header = gquic_be_gen_reg_pkt_header,
.pf_parse_packet_in_finish = gquic_be_parse_packet_in_finish,
.pf_gen_stream_frame = gquic_be_gen_stream_frame,
.pf_calc_stream_frame_header_sz = calc_stream_frame_header_sz_gquic,
.pf_parse_stream_frame_header_sz = parse_stream_frame_header_sz_gquic,
.pf_parse_stream_frame = gquic_be_parse_stream_frame,
.pf_parse_ack_frame = gquic_be_parse_ack_frame,
.pf_parse_ack_high = gquic_be_parse_ack_high,
.pf_gen_ack_frame = gquic_be_gen_ack_frame,
.pf_gen_stop_waiting_frame = gquic_be_gen_stop_waiting_frame,
.pf_parse_stop_waiting_frame = gquic_be_parse_stop_waiting_frame,
.pf_skip_stop_waiting_frame = gquic_be_skip_stop_waiting_frame,
.pf_gen_window_update_frame = gquic_be_gen_window_update_frame,
.pf_parse_window_update_frame = gquic_be_parse_window_update_frame,
.pf_gen_blocked_frame = gquic_be_gen_blocked_frame,
.pf_parse_blocked_frame = gquic_be_parse_blocked_frame,
.pf_gen_rst_frame = gquic_be_gen_rst_frame,
.pf_parse_rst_frame = gquic_be_parse_rst_frame,
.pf_gen_connect_close_frame = gquic_be_gen_connect_close_frame,
.pf_parse_connect_close_frame = gquic_be_parse_connect_close_frame,
.pf_gen_goaway_frame = gquic_be_gen_goaway_frame,
.pf_parse_goaway_frame = gquic_be_parse_goaway_frame,
.pf_gen_ping_frame = gquic_be_gen_ping_frame,
#ifndef NDEBUG
.pf_write_float_time16 = gquic_be_write_float_time16,
.pf_read_float_time16 = gquic_be_read_float_time16,
#endif
.pf_parse_frame_type = parse_frame_type_gquic_Q035_thru_Q039,
};
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