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|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com) | ||
| 3 | // | ||
| 4 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | ||
| 5 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | ||
| 6 | // | ||
| 7 | // Official repository: https://github.com/cppalliance/http_proto | ||
| 8 | // | ||
| 9 | |||
| 10 | #include <boost/http_proto/buffered_base.hpp> | ||
| 11 | #include <boost/http_proto/detail/except.hpp> | ||
| 12 | |||
| 13 | namespace boost { | ||
| 14 | namespace http_proto { | ||
| 15 | |||
| 16 | 54 | buffered_base:: | |
| 17 | ~buffered_base() = default; | ||
| 18 | |||
| 19 | void | ||
| 20 | 2 | buffered_base:: | |
| 21 | on_init(allocator&) | ||
| 22 | { | ||
| 23 | 2 | } | |
| 24 | |||
| 25 | void | ||
| 26 | 8 | buffered_base:: | |
| 27 | init( | ||
| 28 | allocator& a, | ||
| 29 | std::size_t max_size) | ||
| 30 | { | ||
| 31 | // max_size exceeds limit | ||
| 32 |
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8 | if(max_size > a.max_size()) |
| 33 | 1 | detail::throw_invalid_argument(); | |
| 34 | |||
| 35 | struct restorer | ||
| 36 | { | ||
| 37 | allocator& a; | ||
| 38 | std::size_t n; | ||
| 39 | |||
| 40 | 7 | ~restorer() | |
| 41 | { | ||
| 42 | 7 | a.restore(n); | |
| 43 | 7 | } | |
| 44 | }; | ||
| 45 | |||
| 46 | auto const n = | ||
| 47 | 7 | a.max_size() - max_size; | |
| 48 | 7 | a.remove(n); | |
| 49 | 7 | restorer r{a, n}; | |
| 50 |
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7 | init(a); |
| 51 | 7 | } | |
| 52 | |||
| 53 | //------------------------------------------------ | ||
| 54 | |||
| 55 | void* | ||
| 56 | 10 | buffered_base:: | |
| 57 | allocator:: | ||
| 58 | allocate( | ||
| 59 | std::size_t n) | ||
| 60 | { | ||
| 61 | // n exceeds available space | ||
| 62 |
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10 | if(n > size_) |
| 63 | 3 | detail::throw_invalid_argument(); | |
| 64 | |||
| 65 | 7 | size_used_ += n; | |
| 66 |
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7 | if(down_) |
| 67 | { | ||
| 68 | 3 | auto p = base_ + size_ - n; | |
| 69 | 3 | size_ -= n; | |
| 70 | 3 | return p; | |
| 71 | } | ||
| 72 | 4 | auto p = base_; | |
| 73 | 4 | base_ += n; | |
| 74 | 4 | size_ -= n; | |
| 75 | 4 | return p; | |
| 76 | } | ||
| 77 | |||
| 78 | } // http_proto | ||
| 79 | } // boost | ||
| 80 |