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Diffstat (limited to 'include/haproxy/qpack-tbl-t.h')
| -rw-r--r-- | include/haproxy/qpack-tbl-t.h | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/include/haproxy/qpack-tbl-t.h b/include/haproxy/qpack-tbl-t.h new file mode 100644 index 0000000..c27c623 --- /dev/null +++ b/include/haproxy/qpack-tbl-t.h @@ -0,0 +1,65 @@ +/* + * QPACK header table management (draft-ietf-quic-qpack-20) - type definitions + * + * Copyright 2020 HAProxy Technologies, Frederic Lecaille <flecaille@haproxy.com> + * + * 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 _HAPROXY_QPACK_TBL_T_H +#define _HAPROXY_QPACK_TBL_T_H + +/* + * Gcc before 3.0 needs [0] to declare a variable-size array + */ +#ifndef VAR_ARRAY +#if defined(__GNUC__) && (__GNUC__ < 3) +#define VAR_ARRAY 0 +#else +#define VAR_ARRAY +#endif +#endif + +/* One dynamic table entry descriptor */ +struct qpack_dte { + uint32_t addr; /* storage address, relative to the dte address */ + uint16_t nlen; /* header name length */ + uint16_t vlen; /* header value length */ +}; + +/* Note: the table's head plus a struct qpack_dte must be smaller than or equal to 32 + * bytes so that a single large header can always fit. Here that's 16 bytes for + * the header, plus 8 bytes per slot. + * Note that when <used> == 0, front, head, and wrap are undefined. + */ +struct qpack_dht { + uint32_t size; /* allocated table size in bytes */ + uint32_t total; /* sum of nlen + vlen in bytes */ + uint16_t front; /* slot number of the first node after the idx table */ + uint16_t wrap; /* number of allocated slots, wraps here */ + uint16_t head; /* last inserted slot number */ + uint16_t used; /* number of slots in use */ + struct qpack_dte dte[VAR_ARRAY]; /* dynamic table entries */ +}; + +/* static header table as in draft-ietf-quic-qpack-20 Appendix A. [0] unused. */ +#define QPACK_SHT_SIZE 99 + +#endif /* _HAPROXY_QPACK_TBL_T_H */ |