diff options
Diffstat (limited to 'lib/ngtcp2_range.c')
-rw-r--r-- | lib/ngtcp2_range.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/lib/ngtcp2_range.c b/lib/ngtcp2_range.c new file mode 100644 index 0000000..9379496 --- /dev/null +++ b/lib/ngtcp2_range.c @@ -0,0 +1,61 @@ +/* + * 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. + */ +#include "ngtcp2_range.h" +#include "ngtcp2_macro.h" + +void ngtcp2_range_init(ngtcp2_range *r, uint64_t begin, uint64_t end) { + r->begin = begin; + r->end = end; +} + +ngtcp2_range ngtcp2_range_intersect(const ngtcp2_range *a, + const ngtcp2_range *b) { + ngtcp2_range r = {0, 0}; + uint64_t begin = ngtcp2_max(a->begin, b->begin); + uint64_t end = ngtcp2_min(a->end, b->end); + if (begin < end) { + ngtcp2_range_init(&r, begin, end); + } + return r; +} + +uint64_t ngtcp2_range_len(const ngtcp2_range *r) { return r->end - r->begin; } + +int ngtcp2_range_eq(const ngtcp2_range *a, const ngtcp2_range *b) { + return a->begin == b->begin && a->end == b->end; +} + +void ngtcp2_range_cut(ngtcp2_range *left, ngtcp2_range *right, + const ngtcp2_range *a, const ngtcp2_range *b) { + /* Assume that b is included in a */ + left->begin = a->begin; + left->end = b->begin; + right->begin = b->end; + right->end = a->end; +} + +int ngtcp2_range_not_after(const ngtcp2_range *a, const ngtcp2_range *b) { + return a->end <= b->end; +} |