commit 42ea4c1e167a85255b930ff0bbfe56e9c2e749c5
Author: Ryan <ryan@helloryan.se>
Date:   Tue Dec 24 21:19:10 2024 +0100

    Hello libcode-crc

diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..ec9f3de
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,17 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.md]
+indent_size = 4
+max_line_length = off
+trim_trailing_whitespace = false
+
+[*.yaml]
+indent_size = 2
diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..176a458
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1 @@
+* text=auto
diff --git a/.gitea/workflows/on-push.yaml b/.gitea/workflows/on-push.yaml
new file mode 100644
index 0000000..23a9e11
--- /dev/null
+++ b/.gitea/workflows/on-push.yaml
@@ -0,0 +1,24 @@
+name: on-push
+on: [push]
+
+jobs:
+  build-and-test:
+    runs-on: linux
+    container: code.helloryan.se/infra/buildenv/cxx-amd64-fedora-40:latest
+    volumes:
+      - /build
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v3
+      - name: Authenticate
+        run: |
+          git config unset http.https://code.helloryan.se/.extraheader
+          echo "${{ secrets.NETRC }}" >> ~/.netrc
+      - name: Initialize
+        run: |
+          bpkg create -d /build cc config.cc.coptions="-Wall -Werror"
+          bdep init -A /build
+      - name: Build
+        run: b
+      - name: Test
+        run: b test
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..10d90d1
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,25 @@
+.bdep/
+
+# Local default options files.
+#
+.build2/local/
+
+# Compiler/linker output.
+#
+*.d
+*.t
+*.i
+*.ii
+*.o
+*.obj
+*.so
+*.dll
+*.a
+*.lib
+*.exp
+*.pdb
+*.ilk
+*.exe
+*.exe.dlls/
+*.exe.manifest
+*.pc
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..dfc745b
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,31 @@
+Copyright © 2024 Ryan. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice,
+   this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+
+3. All advertising materials mentioning features or use of this software must
+   display the following acknowledgement:
+
+       This product includes software developed by Ryan, http://helloryan.se/.
+
+4. Neither the name(s) of the copyright holder(s) nor the names of its
+   contributors may be used to endorse or promote products derived from this
+   software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY COPYRIGHT HOLDER "AS IS" AND ANY EXPRESS OR
+IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+NO EVENT SHALL COPYRIGHT HOLDER BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..605aaad
--- /dev/null
+++ b/README.md
@@ -0,0 +1,21 @@
+# libcode-crc
+
+![Build status](https://code.helloryan.se/code/libcode-crc/actions/workflows/on-push.yaml/badge.svg)
+
+## Requirements
+
+None, other than a modern C++-compiler.
+
+## Building
+
+See the wiki, https://code.helloryan.se/code/wiki/wiki/Build-Instructions, for
+build instructions.
+
+## Contact
+
+Please report bugs and issues by sending an e-mail to: ryan@helloryan.se.
+
+## Contributing
+
+Please send an e-mail to ryan@helloryan.se to request an account and
+write-access to the libcode-crc repository.
diff --git a/build/.gitignore b/build/.gitignore
new file mode 100644
index 0000000..4a730a3
--- /dev/null
+++ b/build/.gitignore
@@ -0,0 +1,3 @@
+config.build
+root/
+bootstrap/
diff --git a/build/bootstrap.build b/build/bootstrap.build
new file mode 100644
index 0000000..a8b2731
--- /dev/null
+++ b/build/bootstrap.build
@@ -0,0 +1,7 @@
+project = libcode-crc
+
+using version
+using config
+using test
+using install
+using dist
diff --git a/build/export.build b/build/export.build
new file mode 100644
index 0000000..8476136
--- /dev/null
+++ b/build/export.build
@@ -0,0 +1,6 @@
+$out_root/
+{
+  include code/crc/
+}
+
+export $out_root/code/crc/$import.target
diff --git a/build/root.build b/build/root.build
new file mode 100644
index 0000000..d3cad9f
--- /dev/null
+++ b/build/root.build
@@ -0,0 +1,15 @@
+cxx.std = latest
+
+using cxx
+
+hxx{*}: extension = hxx
+ixx{*}: extension = ixx
+txx{*}: extension = txx
+cxx{*}: extension = cxx
+
+if ($cxx.class == 'msvc')
+  cxx.coptions += /wd4251 /wd4275
+
+# The test target for cross-testing (running tests under Wine, etc).
+#
+test.target = $cxx.target
diff --git a/buildfile b/buildfile
new file mode 100644
index 0000000..bbe185e
--- /dev/null
+++ b/buildfile
@@ -0,0 +1,5 @@
+./: {code/ tests/} doc{README.md} legal{LICENSE} manifest
+
+# Don't install tests.
+#
+tests/: install = false
diff --git a/code/crc/.gitignore b/code/crc/.gitignore
new file mode 100644
index 0000000..b1ed0e0
--- /dev/null
+++ b/code/crc/.gitignore
@@ -0,0 +1,9 @@
+# Generated version header.
+#
+version.hxx
+
+# Unit test executables and Testscript output directories
+# (can be symlinks).
+#
+*.test
+test-*.test
diff --git a/code/crc/buildfile b/code/crc/buildfile
new file mode 100644
index 0000000..12c6ee9
--- /dev/null
+++ b/code/crc/buildfile
@@ -0,0 +1,62 @@
+intf_libs = # Interface dependencies.
+impl_libs = # Implementation dependencies.
+
+./: lib{code-crc}: libul{code-crc}
+
+libul{code-crc}: {hxx ixx txx cxx}{** -**.test... -version} \
+                 {hxx            }{                version}
+
+libul{code-crc}: $impl_libs $intf_libs
+
+# Unit tests.
+#
+exe{*.test}:
+{
+  test = true
+  install = false
+}
+
+for t: cxx{**.test...}
+{
+  d = $directory($t)
+  n = $name($t)...
+
+  ./: $d/exe{$n}: $t $d/{hxx ixx txx}{+$n} $d/testscript{+$n}
+  $d/exe{$n}: libul{code-crc}: bin.whole = false
+}
+
+hxx{version}: in{version} $src_root/manifest
+{
+  dist  = true
+  clean = ($src_root != $out_root)
+}
+
+# Build options.
+#
+cxx.poptions =+ "-I$out_root" "-I$src_root"
+
+# Export options.
+#
+lib{code-crc}:
+{
+  cxx.export.poptions = "-I$out_root" "-I$src_root"
+  cxx.export.libs = $intf_libs
+}
+
+# For pre-releases use the complete version to make sure they cannot be used
+# in place of another pre-release or the final version. See the version module
+# for details on the version.* variable values.
+#
+if $version.pre_release
+  lib{code-crc}: bin.lib.version = @"-$version.project_id"
+else
+  lib{code-crc}: bin.lib.version = @"-$version.major.$version.minor"
+
+# Install into the code/crc/ subdirectory of, say, /usr/include/
+# recreating subdirectories.
+#
+{hxx ixx txx}{*}:
+{
+  install         = include/code/crc/
+  install.subdirs = true
+}
diff --git a/code/crc/crc32.cxx b/code/crc/crc32.cxx
new file mode 100644
index 0000000..88b41b9
--- /dev/null
+++ b/code/crc/crc32.cxx
@@ -0,0 +1,120 @@
+#include <code/crc/crc32.hxx>
+
+#include <iomanip>
+#include <iterator>
+#include <sstream>
+
+namespace code::crc
+{
+
+  void
+  crc32::reset()
+  {
+    checksum_ = 0xFFFFFFFF;
+  }
+
+  void
+  crc32::update(char byte)
+  {
+    static std::uint32_t table[]{
+      0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
+      0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
+      0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
+      0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
+      0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
+      0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
+      0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
+      0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
+      0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
+      0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
+      0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
+      0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
+      0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
+      0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
+      0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
+      0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
+      0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
+      0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
+      0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
+      0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
+      0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
+      0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
+      0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
+      0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
+      0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
+      0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
+      0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
+      0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
+      0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
+      0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
+      0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
+      0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
+      0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
+      0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
+      0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
+      0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
+      0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
+      0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
+      0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
+      0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
+      0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
+      0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
+      0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d};
+
+    checksum_ = (checksum_ >> 8) ^ table[(checksum_ ^ byte) & 0xFF];
+  }
+
+  void
+  crc32::update(char const* data, std::size_t length)
+  {
+    if (!data)
+      throw std::invalid_argument{"data"};
+
+    for (std::size_t i{0}; i < length; ++i)
+      update(data[i]);
+  }
+
+  void
+  crc32::update(std::string const& str)
+  {
+    for (auto const& j : str)
+      update(j);
+  }
+
+  void
+  crc32::update(std::istream& in)
+  {
+    std::istream_iterator< char > it{in};
+    std::istream_iterator< char > end{};
+
+    while (it != end)
+      update(*it++);
+  }
+
+  void
+  crc32::finalize()
+  {
+    checksum_ ^= 0xFFFFFFFF;
+  }
+
+  std::uint32_t
+  crc32::checksum() const
+  {
+    return checksum_;
+  }
+
+  std::string
+  to_string(crc32 const& checksum)
+  {
+    return std::to_string(checksum.checksum());
+  }
+
+  std::string
+  to_hex(crc32 const& checksum)
+  {
+    std::stringstream str;
+    str << std::hex << std::setfill('0') << std::setw(8) << checksum.checksum();
+    return str.str();
+  }
+
+} // namespace code::crc
diff --git a/code/crc/crc32.hxx b/code/crc/crc32.hxx
new file mode 100644
index 0000000..588b906
--- /dev/null
+++ b/code/crc/crc32.hxx
@@ -0,0 +1,46 @@
+#ifndef code__crc__crc32_hxx_
+#define code__crc__crc32_hxx_
+
+#include <cstdint>
+#include <string>
+
+namespace code::crc
+{
+
+  class crc32
+  {
+  public:
+    void
+    reset();
+
+    void
+    update(char byte);
+
+    void
+    update(char const* data, std::size_t length);
+
+    void
+    update(std::string const& str);
+
+    void
+    update(std::istream& in);
+
+    void
+    finalize();
+
+    std::uint32_t
+    checksum() const;
+
+  private:
+    std::uint32_t checksum_{0xFFFFFFFF};
+  };
+
+  std::string
+  to_string(crc32 const& checksum);
+
+  std::string
+  to_hex(crc32 const& checksum);
+
+} // namespace code::crc
+
+#endif
diff --git a/code/crc/crc32.test.cxx b/code/crc/crc32.test.cxx
new file mode 100644
index 0000000..442c66f
--- /dev/null
+++ b/code/crc/crc32.test.cxx
@@ -0,0 +1,17 @@
+#include <code/crc/crc32.hxx>
+
+int
+main()
+{
+  code::crc::crc32 crc32;
+  crc32.update("hello, world");
+  crc32.finalize();
+
+  auto checksum = to_hex(crc32);
+
+  if (checksum != "ffab723a") {
+    return -1;
+  }
+
+  return 0;
+}
diff --git a/code/crc/version.hxx.in b/code/crc/version.hxx.in
new file mode 100644
index 0000000..a826830
--- /dev/null
+++ b/code/crc/version.hxx.in
@@ -0,0 +1,36 @@
+#ifndef libcode__crc__version_hxx_
+#define libcode__crc__version_hxx_
+
+// The numeric version format is AAAAABBBBBCCCCCDDDE where:
+//
+// AAAAA - major version number
+// BBBBB - minor version number
+// CCCCC - bugfix version number
+// DDD   - alpha / beta (DDD + 500) version number
+// E     - final (0) / snapshot (1)
+//
+// When DDDE is not 0, 1 is subtracted from AAAAABBBBBCCCCC. For example:
+//
+// Version      AAAAABBBBBCCCCCDDDE
+//
+// 0.1.0        0000000001000000000
+// 0.1.2        0000000001000020000
+// 1.2.3        0000100002000030000
+// 2.2.0-a.1    0000200001999990010
+// 3.0.0-b.2    0000299999999995020
+// 2.2.0-a.1.z  0000200001999990011
+//
+#define LIBCODE_CRC_VERSION $libcode_crc.version.project_number$ULL
+#define LIBCODE_CRC_VERSION_STR "$libcode_crc.version.project$"
+#define LIBCODE_CRC_VERSION_ID "$libcode_crc.version.project_id$"
+
+#define LIBCODE_CRC_VERSION_MAJOR $libcode_crc.version.major$
+#define LIBCODE_CRC_VERSION_MINOR $libcode_crc.version.minor$
+#define LIBCODE_CRC_VERSION_PATCH $libcode_crc.version.patch$
+
+#define LIBCODE_CRC_PRE_RELEASE $libcode_crc.version.pre_release$
+
+#define LIBCODE_CRC_SNAPSHOT_SN $libcode_crc.version.snapshot_sn$ULL
+#define LIBCODE_CRC_SNAPSHOT_ID "$libcode_crc.version.snapshot_id$"
+
+#endif
diff --git a/manifest b/manifest
new file mode 100644
index 0000000..edf24b3
--- /dev/null
+++ b/manifest
@@ -0,0 +1,11 @@
+: 1
+name: libcode-crc
+version: 0.1.0-a.0.z
+language: c++
+summary: libcode-crc C++ library
+license: BSD-4-Clause
+description-file: README.md
+url: https://helloryan.se/code/
+email: ryan@helloryan.se
+depends: * build2 >= 0.17.0
+depends: * bpkg >= 0.17.0
diff --git a/repositories.manifest b/repositories.manifest
new file mode 100644
index 0000000..08eaa64
--- /dev/null
+++ b/repositories.manifest
@@ -0,0 +1,2 @@
+: 1
+summary: libcode-crc project repository
diff --git a/tests/.gitignore b/tests/.gitignore
new file mode 100644
index 0000000..662178d
--- /dev/null
+++ b/tests/.gitignore
@@ -0,0 +1,8 @@
+# Test executables.
+#
+driver
+
+# Testscript output directories (can be symlinks).
+#
+test
+test-*
diff --git a/tests/build/.gitignore b/tests/build/.gitignore
new file mode 100644
index 0000000..4a730a3
--- /dev/null
+++ b/tests/build/.gitignore
@@ -0,0 +1,3 @@
+config.build
+root/
+bootstrap/
diff --git a/tests/build/bootstrap.build b/tests/build/bootstrap.build
new file mode 100644
index 0000000..a07b5ea
--- /dev/null
+++ b/tests/build/bootstrap.build
@@ -0,0 +1,5 @@
+project = # Unnamed tests subproject.
+
+using config
+using test
+using dist
diff --git a/tests/build/root.build b/tests/build/root.build
new file mode 100644
index 0000000..a67b2fe
--- /dev/null
+++ b/tests/build/root.build
@@ -0,0 +1,16 @@
+cxx.std = latest
+
+using cxx
+
+hxx{*}: extension = hxx
+ixx{*}: extension = ixx
+txx{*}: extension = txx
+cxx{*}: extension = cxx
+
+# Every exe{} in this subproject is by default a test.
+#
+exe{*}: test = true
+
+# The test target for cross-testing (running tests under Wine, etc).
+#
+test.target = $cxx.target
diff --git a/tests/buildfile b/tests/buildfile
new file mode 100644
index 0000000..aeeab15
--- /dev/null
+++ b/tests/buildfile
@@ -0,0 +1 @@
+./: {*/ -build/}