lsquic_version.c revision 10c492f0
110c492f0SDmitri Tikhonov/* Copyright (c) 2017 - 2018 LiteSpeed Technologies Inc.  See LICENSE. */
250aadb33SDmitri Tikhonov#include <string.h>
350aadb33SDmitri Tikhonov
450aadb33SDmitri Tikhonov#include "lsquic.h"
550aadb33SDmitri Tikhonov#include "lsquic_int_types.h"
650aadb33SDmitri Tikhonov#include "lsquic_version.h"
750aadb33SDmitri Tikhonov
850aadb33SDmitri Tikhonov
950aadb33SDmitri Tikhonovstatic const unsigned char version_tags[N_LSQVER][4] =
1050aadb33SDmitri Tikhonov{
1150aadb33SDmitri Tikhonov    [LSQVER_035] = { 'Q', '0', '3', '5', },
1250aadb33SDmitri Tikhonov    [LSQVER_037] = { 'Q', '0', '3', '7', },
1350aadb33SDmitri Tikhonov    [LSQVER_038] = { 'Q', '0', '3', '8', },
1450aadb33SDmitri Tikhonov    [LSQVER_039] = { 'Q', '0', '3', '9', },
151b97e4afSDmitri Tikhonov    [LSQVER_041] = { 'Q', '0', '4', '1', },
1650aadb33SDmitri Tikhonov};
1750aadb33SDmitri Tikhonov
1850aadb33SDmitri Tikhonov
1950aadb33SDmitri Tikhonovuint32_t
2050aadb33SDmitri Tikhonovlsquic_ver2tag (unsigned version)
2150aadb33SDmitri Tikhonov{
2250aadb33SDmitri Tikhonov    lsquic_ver_tag_t tag;
2350aadb33SDmitri Tikhonov    if (version < N_LSQVER)
2450aadb33SDmitri Tikhonov    {
2550aadb33SDmitri Tikhonov        memcpy(&tag, version_tags[version], 4);
2650aadb33SDmitri Tikhonov        return tag;
2750aadb33SDmitri Tikhonov    }
2850aadb33SDmitri Tikhonov    else
2950aadb33SDmitri Tikhonov        return 0;
3050aadb33SDmitri Tikhonov}
3150aadb33SDmitri Tikhonov
3250aadb33SDmitri Tikhonov
3350aadb33SDmitri Tikhonovenum lsquic_version
3450aadb33SDmitri Tikhonovlsquic_tag2ver (uint32_t ver_tag)
3550aadb33SDmitri Tikhonov{
3650aadb33SDmitri Tikhonov    unsigned n;
3750aadb33SDmitri Tikhonov    for (n = 0; n < sizeof(version_tags) / sizeof(version_tags[0]); ++n)
3850aadb33SDmitri Tikhonov        if (0 == memcmp(version_tags[n], &ver_tag, sizeof(ver_tag)))
3950aadb33SDmitri Tikhonov            return n;
4050aadb33SDmitri Tikhonov    return -1;
4150aadb33SDmitri Tikhonov}
4250aadb33SDmitri Tikhonov
4350aadb33SDmitri Tikhonov
4450aadb33SDmitri Tikhonovenum lsquic_version
4550aadb33SDmitri Tikhonovlsquic_str2ver (const char *str, size_t len)
4650aadb33SDmitri Tikhonov{
4750aadb33SDmitri Tikhonov    uint32_t tag;
4850aadb33SDmitri Tikhonov
4950aadb33SDmitri Tikhonov    if (len == sizeof(tag) && 'Q' == str[0])
5050aadb33SDmitri Tikhonov    {
5150aadb33SDmitri Tikhonov        memcpy(&tag, str, sizeof(tag));
5250aadb33SDmitri Tikhonov        return lsquic_tag2ver(tag);
5350aadb33SDmitri Tikhonov    }
5450aadb33SDmitri Tikhonov    else
5550aadb33SDmitri Tikhonov        return -1;
5650aadb33SDmitri Tikhonov}
5750aadb33SDmitri Tikhonov
5850aadb33SDmitri Tikhonov
5950aadb33SDmitri Tikhonovconst char *const lsquic_ver2str[N_LSQVER] = {
6050aadb33SDmitri Tikhonov    [LSQVER_035] = "Q035",
6150aadb33SDmitri Tikhonov    [LSQVER_037] = "Q037",
6250aadb33SDmitri Tikhonov    [LSQVER_038] = "Q038",
6350aadb33SDmitri Tikhonov    [LSQVER_039] = "Q039",
641b97e4afSDmitri Tikhonov    [LSQVER_041] = "Q041",
6550aadb33SDmitri Tikhonov};
6650aadb33SDmitri Tikhonov
6750aadb33SDmitri Tikhonov
6850aadb33SDmitri Tikhonovint
6950aadb33SDmitri Tikhonovgen_ver_tags (unsigned char *buf, size_t bufsz, unsigned version_bitmask)
7050aadb33SDmitri Tikhonov{
7150aadb33SDmitri Tikhonov    unsigned n;
7250aadb33SDmitri Tikhonov    lsquic_ver_tag_t tag;
7350aadb33SDmitri Tikhonov    unsigned char *p = buf;
7450aadb33SDmitri Tikhonov    unsigned char *const pend = p + bufsz;
7550aadb33SDmitri Tikhonov    for (n = 0; version_bitmask; ++n)
7650aadb33SDmitri Tikhonov    {
7750aadb33SDmitri Tikhonov        if (version_bitmask & (1 << n))
7850aadb33SDmitri Tikhonov        {
7950aadb33SDmitri Tikhonov            if (p + 4 > pend)
8050aadb33SDmitri Tikhonov                return -1;
8150aadb33SDmitri Tikhonov            version_bitmask &= ~(1 << n);
8250aadb33SDmitri Tikhonov            tag = lsquic_ver2tag(n);
8350aadb33SDmitri Tikhonov            if (0 == tag)
8450aadb33SDmitri Tikhonov                return -1;
8550aadb33SDmitri Tikhonov            memcpy(p, &tag, 4);
8650aadb33SDmitri Tikhonov            p += 4;
8750aadb33SDmitri Tikhonov        }
8850aadb33SDmitri Tikhonov    }
8950aadb33SDmitri Tikhonov    return p - buf;
9050aadb33SDmitri Tikhonov}
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