libs/http/src/server/range_parser.cpp
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libs/http/src/server/range_parser.cpp
| Line | Hits | Source Code |
|---|---|---|
| 1 | // | |
| 2 | // Copyright (c) 2025 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 | |
| 8 | // | |
| 9 | ||
| 10 | #include <boost/http/server/range_parser.hpp> | |
| 11 | #include <algorithm> | |
| 12 | #include <cctype> | |
| 13 | #include <charconv> | |
| 14 | ||
| 15 | namespace boost { | |
| 16 | namespace http { | |
| 17 | ||
| 18 | namespace { | |
| 19 | ||
| 20 | // Skip whitespace | |
| 21 | void | |
| 22 | ✗ | skip_ws( core::string_view& s ) noexcept |
| 23 | { | |
| 24 | ✗ | while( ! s.empty() && std::isspace( |
| 25 | ✗ | static_cast<unsigned char>( s.front() ) ) ) |
| 26 | ✗ | s.remove_prefix( 1 ); |
| 27 | ✗ | } |
| 28 | ||
| 29 | // Parse integer | |
| 30 | bool | |
| 31 | ✗ | parse_int( core::string_view& s, std::int64_t& out ) noexcept |
| 32 | { | |
| 33 | ✗ | skip_ws( s ); |
| 34 | ✗ | if( s.empty() ) |
| 35 | ✗ | return false; |
| 36 | ||
| 37 | ✗ | auto const* begin = s.data(); |
| 38 | ✗ | auto const* end = s.data() + s.size(); |
| 39 | ✗ | auto [ptr, ec] = std::from_chars( begin, end, out ); |
| 40 | ✗ | if( ec != std::errc() || ptr == begin ) |
| 41 | ✗ | return false; |
| 42 | ||
| 43 | ✗ | s.remove_prefix( static_cast<std::size_t>( ptr - begin ) ); |
| 44 | ✗ | return true; |
| 45 | } | |
| 46 | ||
| 47 | // Parse a single range spec: "start-end" or "-suffix" or "start-" | |
| 48 | bool | |
| 49 | ✗ | parse_range_spec( |
| 50 | core::string_view& s, | |
| 51 | std::int64_t size, | |
| 52 | byte_range& out ) | |
| 53 | { | |
| 54 | ✗ | skip_ws( s ); |
| 55 | ✗ | if( s.empty() ) |
| 56 | ✗ | return false; |
| 57 | ||
| 58 | ✗ | std::int64_t start = -1; |
| 59 | ✗ | std::int64_t end = -1; |
| 60 | ||
| 61 | // Check for suffix range: "-suffix" | |
| 62 | ✗ | if( s.front() == '-' ) |
| 63 | { | |
| 64 | ✗ | s.remove_prefix( 1 ); |
| 65 | std::int64_t suffix; | |
| 66 | ✗ | if( ! parse_int( s, suffix ) || suffix < 0 ) |
| 67 | ✗ | return false; |
| 68 | ||
| 69 | // Last 'suffix' bytes | |
| 70 | ✗ | if( suffix == 0 ) |
| 71 | ✗ | return false; |
| 72 | ||
| 73 | ✗ | if( suffix > size ) |
| 74 | ✗ | suffix = size; |
| 75 | ||
| 76 | ✗ | out.start = size - suffix; |
| 77 | ✗ | out.end = size - 1; |
| 78 | ✗ | return true; |
| 79 | } | |
| 80 | ||
| 81 | // Parse start | |
| 82 | ✗ | if( ! parse_int( s, start ) || start < 0 ) |
| 83 | ✗ | return false; |
| 84 | ||
| 85 | ✗ | skip_ws( s ); |
| 86 | ✗ | if( s.empty() || s.front() != '-' ) |
| 87 | ✗ | return false; |
| 88 | ||
| 89 | ✗ | s.remove_prefix( 1 ); // consume '-' |
| 90 | ||
| 91 | // Check for "start-" (open-ended) | |
| 92 | ✗ | skip_ws( s ); |
| 93 | ✗ | if( s.empty() || s.front() == ',' ) |
| 94 | { | |
| 95 | // Open-ended: start to end of file | |
| 96 | ✗ | out.start = start; |
| 97 | ✗ | out.end = size - 1; |
| 98 | ✗ | return start < size; |
| 99 | } | |
| 100 | ||
| 101 | // Parse end | |
| 102 | ✗ | if( ! parse_int( s, end ) || end < 0 ) |
| 103 | ✗ | return false; |
| 104 | ||
| 105 | // Validate | |
| 106 | ✗ | if( start > end ) |
| 107 | ✗ | return false; |
| 108 | ||
| 109 | ✗ | out.start = start; |
| 110 | ✗ | out.end = ( std::min )( end, size - 1 ); |
| 111 | ||
| 112 | ✗ | return start < size; |
| 113 | } | |
| 114 | ||
| 115 | } // (anon) | |
| 116 | ||
| 117 | range_result | |
| 118 | ✗ | parse_range( std::int64_t size, core::string_view header ) |
| 119 | { | |
| 120 | ✗ | range_result result; |
| 121 | ✗ | result.type = range_result_type::malformed; |
| 122 | ||
| 123 | ✗ | if( size <= 0 ) |
| 124 | { | |
| 125 | ✗ | result.type = range_result_type::unsatisfiable; |
| 126 | ✗ | return result; |
| 127 | } | |
| 128 | ||
| 129 | // Must start with "bytes=" | |
| 130 | ✗ | skip_ws( header ); |
| 131 | ✗ | if( header.size() < 6 ) |
| 132 | ✗ | return result; |
| 133 | ||
| 134 | // Case-insensitive "bytes=" check | |
| 135 | ✗ | auto prefix = header.substr( 0, 6 ); |
| 136 | ✗ | bool is_bytes = true; |
| 137 | ✗ | for( std::size_t i = 0; i < 5; ++i ) |
| 138 | { | |
| 139 | ✗ | char c = static_cast<char>( std::tolower( |
| 140 | ✗ | static_cast<unsigned char>( prefix[i] ) ) ); |
| 141 | ✗ | if( c != "bytes"[i] ) |
| 142 | { | |
| 143 | ✗ | is_bytes = false; |
| 144 | ✗ | break; |
| 145 | } | |
| 146 | } | |
| 147 | ✗ | if( ! is_bytes || prefix[5] != '=' ) |
| 148 | ✗ | return result; |
| 149 | ||
| 150 | ✗ | header.remove_prefix( 6 ); |
| 151 | ||
| 152 | // Parse range specs | |
| 153 | ✗ | bool any_satisfiable = false; |
| 154 | ||
| 155 | ✗ | while( ! header.empty() ) |
| 156 | { | |
| 157 | ✗ | skip_ws( header ); |
| 158 | ✗ | if( header.empty() ) |
| 159 | ✗ | break; |
| 160 | ||
| 161 | ✗ | byte_range range; |
| 162 | ✗ | if( parse_range_spec( header, size, range ) ) |
| 163 | { | |
| 164 | ✗ | result.ranges.push_back( range ); |
| 165 | ✗ | any_satisfiable = true; |
| 166 | } | |
| 167 | ||
| 168 | ✗ | skip_ws( header ); |
| 169 | ✗ | if( ! header.empty() ) |
| 170 | { | |
| 171 | ✗ | if( header.front() == ',' ) |
| 172 | ✗ | header.remove_prefix( 1 ); |
| 173 | else | |
| 174 | ✗ | break; // Invalid |
| 175 | } | |
| 176 | } | |
| 177 | ||
| 178 | ✗ | if( result.ranges.empty() ) |
| 179 | { | |
| 180 | ✗ | result.type = range_result_type::unsatisfiable; |
| 181 | } | |
| 182 | ✗ | else if( any_satisfiable ) |
| 183 | { | |
| 184 | ✗ | result.type = range_result_type::ok; |
| 185 | } | |
| 186 | ||
| 187 | ✗ | return result; |
| 188 | ✗ | } |
| 189 | ||
| 190 | } // http | |
| 191 | } // boost | |
| 192 |