[29] | 1 | // (C) Copyright Jonathan Turkanis 2004 |
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| 2 | // Distributed under the Boost Software License, Version 1.0. (See accompanying |
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| 3 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.) |
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| 4 | |
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| 5 | // See http://www.boost.org/libs/iostreams/ for documentation. |
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| 6 | |
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| 7 | #ifndef BOOST_IOSTREAMS_TEST_PUTBACK_HPP_INCLUDED |
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| 8 | #define BOOST_IOSTREAMS_TEST_PUTBACK_HPP_INCLUDED |
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| 9 | |
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| 10 | #include <boost/iostreams/device/file.hpp> |
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| 11 | #include <boost/iostreams/filtering_stream.hpp> |
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| 12 | #include <boost/iostreams/putback.hpp> |
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| 13 | #include "detail/constants.hpp" |
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| 14 | #include "detail/temp_file.hpp" |
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| 15 | |
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| 16 | using boost::iostreams::test::chunk_size; |
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| 17 | |
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| 18 | bool putback_test_one(std::istream& is) |
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| 19 | { |
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| 20 | try { |
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| 21 | do { |
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| 22 | char buf[chunk_size]; |
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| 23 | is.read(buf, chunk_size); |
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| 24 | if (is.gcount() < static_cast<std::streamsize>(chunk_size)) |
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| 25 | break; |
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| 26 | is.putback('a'); |
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| 27 | if (is.get() != 'a') |
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| 28 | return false; |
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| 29 | } while (!is.eof()); |
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| 30 | return true; |
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| 31 | } catch (std::exception&) { return false; } |
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| 32 | } |
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| 33 | |
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| 34 | bool putback_test_two(std::istream& is) |
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| 35 | { |
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| 36 | try { |
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| 37 | do { |
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| 38 | char buf[chunk_size]; |
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| 39 | is.read(buf, chunk_size); |
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| 40 | if (is.gcount() < static_cast<std::streamsize>(chunk_size)) |
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| 41 | break; |
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| 42 | is.putback('a'); |
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| 43 | is.putback('b'); |
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| 44 | is.putback('c'); |
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| 45 | is.putback('d'); |
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| 46 | if ( is.get() != 'd' || is.get() != 'c' || |
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| 47 | is.get() != 'b' || is.get() != 'a' ) |
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| 48 | { |
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| 49 | return false; |
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| 50 | } |
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| 51 | } while (!is.eof()); |
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| 52 | return true; |
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| 53 | } catch (std::exception&) { return false; } |
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| 54 | } |
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| 55 | |
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| 56 | template<typename Source> |
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| 57 | bool putback_test_three(Source& src) |
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| 58 | { |
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| 59 | try { |
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| 60 | while (true) { |
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| 61 | char buf[chunk_size]; |
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| 62 | if (boost::iostreams::read(src, buf, chunk_size) < chunk_size) |
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| 63 | break; |
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| 64 | boost::iostreams::putback(src, 'a'); |
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| 65 | if (boost::iostreams::get(src) != 'a') |
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| 66 | return false; |
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| 67 | } |
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| 68 | return true; |
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| 69 | } catch (std::exception&) { return false; } |
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| 70 | } |
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| 71 | |
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| 72 | template<typename Source> |
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| 73 | bool putback_test_four(Source& src) |
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| 74 | { |
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| 75 | try { |
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| 76 | while (true) { |
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| 77 | char buf[chunk_size]; |
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| 78 | if (boost::iostreams::read(src, buf, chunk_size) < chunk_size) |
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| 79 | break; |
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| 80 | boost::iostreams::putback(src, 'a'); |
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| 81 | boost::iostreams::putback(src, 'b'); |
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| 82 | boost::iostreams::putback(src, 'c'); |
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| 83 | boost::iostreams::putback(src, 'd'); |
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| 84 | if ( boost::iostreams::get(src) != 'd' || |
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| 85 | boost::iostreams::get(src) != 'c' || |
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| 86 | boost::iostreams::get(src) != 'b' || |
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| 87 | boost::iostreams::get(src) != 'a' ) |
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| 88 | { |
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| 89 | return false; |
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| 90 | } |
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| 91 | } |
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| 92 | return true; |
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| 93 | } catch (std::exception&) { return false; } |
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| 94 | } |
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| 95 | |
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| 96 | void putback_test() |
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| 97 | { |
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| 98 | using namespace std; |
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| 99 | using namespace boost; |
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| 100 | using namespace boost::iostreams; |
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| 101 | using namespace boost::iostreams::test; |
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| 102 | |
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| 103 | test_file test; |
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| 104 | |
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| 105 | { |
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| 106 | filtering_istream is; |
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| 107 | is.set_device_buffer_size(0); |
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| 108 | is.push(file_source(test.name())); |
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| 109 | BOOST_CHECK_MESSAGE( |
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| 110 | putback_test_one(is), |
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| 111 | "failed putting back to unbuffered filtering_istream" |
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| 112 | ); |
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| 113 | } |
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| 114 | |
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| 115 | { |
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| 116 | filtering_istream is; |
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| 117 | is.set_pback_size(4); |
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| 118 | is.push(file_source(test.name())); |
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| 119 | BOOST_CHECK_MESSAGE( |
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| 120 | putback_test_two(is), |
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| 121 | "failed putting back to buffered filtering_istream" |
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| 122 | ); |
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| 123 | } |
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| 124 | |
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| 125 | { |
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| 126 | filtering_istream is; |
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| 127 | is.set_device_buffer_size(0); |
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| 128 | is.push(file_source(test.name())); |
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| 129 | BOOST_CHECK_MESSAGE( |
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| 130 | putback_test_three(is), |
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| 131 | "failed putting back to unbuffered filtering_istream" |
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| 132 | ); |
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| 133 | } |
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| 134 | |
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| 135 | { |
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| 136 | filtering_istream is; |
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| 137 | is.set_pback_size(4); |
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| 138 | is.push(file_source(test.name())); |
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| 139 | BOOST_CHECK_MESSAGE( |
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| 140 | putback_test_four(is), |
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| 141 | "failed putting back to buffered filtering_istream" |
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| 142 | ); |
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| 143 | } |
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| 144 | |
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| 145 | { |
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| 146 | filtering_istreambuf sb; |
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| 147 | sb.set_device_buffer_size(0); |
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| 148 | sb.push(file_source(test.name())); |
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| 149 | BOOST_CHECK_MESSAGE( |
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| 150 | putback_test_three(sb), |
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| 151 | "failed putting back to unbuffered filtering_istream" |
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| 152 | ); |
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| 153 | } |
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| 154 | |
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| 155 | { |
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| 156 | filtering_istreambuf sb; |
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| 157 | sb.set_pback_size(4); |
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| 158 | sb.push(file_source(test.name())); |
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| 159 | BOOST_CHECK_MESSAGE( |
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| 160 | putback_test_four(sb), |
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| 161 | "failed putting back to buffered filtering_istream" |
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| 162 | ); |
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| 163 | } |
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| 164 | } |
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| 165 | |
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| 166 | #endif // #ifndef BOOST_IOSTREAMS_TEST_PUTBACK_HPP_INCLUDED |
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