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Add binary_stream_example.cpp. Improve docs.

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git-svn-id: http://svn.boost.org/svn/boost/sandbox/endian@71463 b8fc166d-592f-0410-95f2-cb63ce0dd405
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bemandawes
2011-04-24 10:59:20 +00:00
parent 793e21594c
commit c3d5f2e2f8
4 changed files with 148 additions and 14 deletions
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42
libs/integer/doc/binary_stream.html
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@@ -11,14 +11,14 @@
<body> <body>
<h1>Proposal for Enhanced Binary Stream I/O</h1> <h1>Proposal for Binary Stream I/O</h1>
<h2>Introduction</h2> <h2>Introduction</h2>
<p>The C++ standard library's stream I/O facilities are type-safe and very <p>The C++ standard library's stream I/O facilities are type-safe and very
convenient for performing formatted (i.e. human readable) I/O, but offer only convenient for performing formatted (i.e. human readable) I/O. But they offer only
rudimentary and not very type-safe operations for performing binary I/O.&nbsp; rudimentary and not very type-safe operations for performing unformatted binary I/O.&nbsp;
Although formatted I/O is often preferable, some applications need the speed and Although formatted I/O is often preferable, some applications need the speed and
storage efficiency of binary I/O or need to interoperate with third-party storage efficiency of unformatted binary I/O or need to interoperate with third-party
applications that require binary file or network data formats.</p> applications that require unformatted binary file or network data formats.</p>
<p>Standard library streams can be opened with filemode <code> <p>Standard library streams can be opened with filemode <code>
std::ios_base::binary</code>, so binary I/O is possible. But the only std::ios_base::binary</code>, so binary I/O is possible. But the only
unformatted I/O functions available are <code>get()</code>, <code>put()</code>, unformatted I/O functions available are <code>get()</code>, <code>put()</code>,
@@ -33,9 +33,9 @@ have in mind is for the simple case where the application that reads data knows
the data types, so this is not as complicated as the general marshalling the data types, so this is not as complicated as the general marshalling
situation.</p> situation.</p>
</blockquote> </blockquote>
<p>This proposal provides a simple solution that works will standard library <p>This proposal provides a simple solution that works with standard library
input and output streams. The one caveat is that they should be open with input and output streams. The one caveat is that the stream must be opened with filemode <code>std::ios_base::binary</code>
filemode <code>std::ios_base::binary</code>.</p> to avoid certain data values being treated as line endings.</p>
<h2>Synopsis</h2> <h2>Synopsis</h2>
<div dir="ltr"> <div dir="ltr">
<pre>namespace boost <pre>namespace boost
@@ -62,19 +62,33 @@ are implementation supplied types.</p>
<blockquote> <blockquote>
<pre>int main() <pre>int main()
{ {
int i = 0x41424344; fstream f(&quot;binary_stream_example.dat&quot;,
std::cout &lt;&lt; std::hex &lt;&lt; i &lt;&lt; &quot; &quot; &lt;&lt; bin(i) &lt;&lt; '\n'; std::ios_base::trunc | std::ios_base::in | std::ios_base::out | std::ios_base::binary);
int32_t x = 0x01020304;
int32_t y = 0;
f &lt;&lt; bin(x);
f.seekg(0);
f &gt;&gt; bin(y);
BOOST_ASSERT(x == y);
return 0; return 0;
}</pre> }</pre>
</blockquote> </blockquote>
<p>On a little-endian machine, the output is:</p> <p>The file produced with be four bytes in length. On a big-endian machine, the
contents in hexadecimal are:</p>
<blockquote> <blockquote>
<pre>41424344 DCBA</pre> <pre>01020304</pre>
</blockquote>
<p>On a little-endian machine, the contents in hexadecimal are:</p>
<blockquote>
<pre>04030201</pre>
</blockquote> </blockquote>
<p>&nbsp;</p>
<hr> <hr>
<p>Last revised: <p>Last revised:
<!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %B, %Y" startspan -->22 April, 2011<!--webbot bot="Timestamp" endspan i-checksum="29826" --></p> <!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %B, %Y" startspan -->24 April, 2011<!--webbot bot="Timestamp" endspan i-checksum="29830" --></p>
<p><EFBFBD> Copyright Beman Dawes, 2009, 2011</p> <p><EFBFBD> Copyright Beman Dawes, 2009, 2011</p>
<p>Distributed under the Boost Software License, Version 1.0. See <p>Distributed under the Boost Software License, Version 1.0. See
<a href="http://www.boost.org/LICENSE_1_0.txt">www.boost.org/ LICENSE_1_0.txt</a></p> <a href="http://www.boost.org/LICENSE_1_0.txt">www.boost.org/ LICENSE_1_0.txt</a></p>

30
libs/integer/example/binary_stream_example.cpp Normal file
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@@ -0,0 +1,30 @@
// binary_stream_example.cpp ---------------------------------------------------------//
// Copyright Beman Dawes 2011
// Distributed under the Boost Software License, Version 1.0.
// See http://www.boost.org/LICENSE_1_0.txt
#include <boost/binary_stream.hpp>
#include <boost/integer.hpp>
#include <boost/assert.hpp>
#include <fstream>
using namespace boost;
using namespace std;
int main()
{
fstream f("binary_stream_example.dat",
std::ios_base::trunc | std::ios_base::in | std::ios_base::out | std::ios_base::binary);
int32_t x = 0x01020304;
int32_t y = 0;
f << bin(x);
f.seekg(0);
f >> bin(y);
BOOST_ASSERT(x == y);
return 0;
}

84
libs/integer/test/endian-in-sandbox/binary_stream_example/binary_stream_example.vcxproj Normal file
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@@ -0,0 +1,84 @@
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<ProjectConfiguration Include="Release|Win32">
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<Keyword>Win32Proj</Keyword>
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<Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
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<Import Project="..\common.props" />
</ImportGroup>
<ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
<Import Project="..\common.props" />
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<PropertyGroup Label="UserMacros" />
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
<LinkIncremental>true</LinkIncremental>
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<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
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6
libs/integer/test/endian-in-sandbox/endian-in-sandbox.sln
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@@ -19,6 +19,8 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "endian_binary_stream_test",
EndProject EndProject
Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "endian_flip_test", "endian_flip_test\endian_flip_test.vcxproj", "{9FA33B0B-2B00-49E8-A892-E049D86076A9}" Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "endian_flip_test", "endian_flip_test\endian_flip_test.vcxproj", "{9FA33B0B-2B00-49E8-A892-E049D86076A9}"
EndProject EndProject
Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "binary_stream_example", "binary_stream_example\binary_stream_example.vcxproj", "{06736C67-6305-4A9F-8D10-850FD0CE907D}"
EndProject
Global Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Win32 = Debug|Win32 Debug|Win32 = Debug|Win32
@@ -61,6 +63,10 @@ Global
{9FA33B0B-2B00-49E8-A892-E049D86076A9}.Debug|Win32.Build.0 = Debug|Win32 {9FA33B0B-2B00-49E8-A892-E049D86076A9}.Debug|Win32.Build.0 = Debug|Win32
{9FA33B0B-2B00-49E8-A892-E049D86076A9}.Release|Win32.ActiveCfg = Release|Win32 {9FA33B0B-2B00-49E8-A892-E049D86076A9}.Release|Win32.ActiveCfg = Release|Win32
{9FA33B0B-2B00-49E8-A892-E049D86076A9}.Release|Win32.Build.0 = Release|Win32 {9FA33B0B-2B00-49E8-A892-E049D86076A9}.Release|Win32.Build.0 = Release|Win32
{06736C67-6305-4A9F-8D10-850FD0CE907D}.Debug|Win32.ActiveCfg = Debug|Win32
{06736C67-6305-4A9F-8D10-850FD0CE907D}.Debug|Win32.Build.0 = Debug|Win32
{06736C67-6305-4A9F-8D10-850FD0CE907D}.Release|Win32.ActiveCfg = Release|Win32
{06736C67-6305-4A9F-8D10-850FD0CE907D}.Release|Win32.Build.0 = Release|Win32
EndGlobalSection EndGlobalSection
GlobalSection(SolutionProperties) = preSolution GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE HideSolutionNode = FALSE