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author | Karl Berry <karl@freefriends.org> | 2021-02-25 19:22:25 +0000 |
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committer | Karl Berry <karl@freefriends.org> | 2021-02-25 19:22:25 +0000 |
commit | ad547a6b5986815fda458221149728d9d9ab1d87 (patch) | |
tree | 16296910eb3eca724371474ea9aea3994dc69614 /Build/source/texk/dvisvgm/dvisvgm-src/src/HashFunction.cpp | |
parent | 947b43de3dd21d58ccc2ffadefc4441ea1c2a813 (diff) |
restore Build,TODO from r57911
git-svn-id: svn://tug.org/texlive/trunk@57915 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Build/source/texk/dvisvgm/dvisvgm-src/src/HashFunction.cpp')
-rw-r--r-- | Build/source/texk/dvisvgm/dvisvgm-src/src/HashFunction.cpp | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/Build/source/texk/dvisvgm/dvisvgm-src/src/HashFunction.cpp b/Build/source/texk/dvisvgm/dvisvgm-src/src/HashFunction.cpp new file mode 100644 index 00000000000..bada148b6c7 --- /dev/null +++ b/Build/source/texk/dvisvgm/dvisvgm-src/src/HashFunction.cpp @@ -0,0 +1,102 @@ +/************************************************************************* +** HashFunction.cpp ** +** ** +** This file is part of dvisvgm -- a fast DVI to SVG converter ** +** Copyright (C) 2005-2021 Martin Gieseking <martin.gieseking@uos.de> ** +** ** +** This program is free software; you can redistribute it and/or ** +** modify it under the terms of the GNU General Public License as ** +** published by the Free Software Foundation; either version 3 of ** +** the License, or (at your option) any later version. ** +** ** +** This program is distributed in the hope that it will be useful, but ** +** WITHOUT ANY WARRANTY; without even the implied warranty of ** +** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ** +** GNU General Public License for more details. ** +** ** +** You should have received a copy of the GNU General Public License ** +** along with this program; if not, see <http://www.gnu.org/licenses/>. ** +*************************************************************************/ + +#include <algorithm> +#include <iomanip> +#include <sstream> +#include "HashFunction.hpp" +#include "utility.hpp" +#include "MD5HashFunction.hpp" +#include "XXHashFunction.hpp" + +using namespace std; + + +/** Returns a vector containing the names of the currently supported hash algorithms. */ +vector<string> HashFunction::supportedAlgorithms () { + return vector<string> { + "md5", "xxh32", "xxh64", +#ifdef ENABLE_XXH128 + "xxh128" +#endif + }; +} + + +/** Returns true if 'algo' is the name of a supported hash algorithm. */ +bool HashFunction::isSupportedAlgorithm (const std::string &algo) { + auto algos = supportedAlgorithms(); + return find(algos.begin(), algos.end(), algo) != algos.end(); +} + + +/** Creates a hash function for a given algorithm name/identifier. + * The following names are currently supported: md5, xxh32, xxh64. */ +unique_ptr<HashFunction> HashFunction::create (const string &name) { + string lowerName = util::tolower(name); + if (lowerName == "md5") + return util::make_unique<MD5HashFunction>(); + if (lowerName == "xxh32") + return util::make_unique<XXH32HashFunction>(); + if (lowerName == "xxh64") + return util::make_unique<XXH64HashFunction>(); +#ifdef ENABLE_XXH128 + if (lowerName == "xxh128") + return util::make_unique<XXH128HashFunction>(); +#endif + return nullptr; +} + + +std::unique_ptr<HashFunction> HashFunction::create (const string &name, const char *data, size_t length) { + auto hashfunc = create(name); + if (hashfunc) + hashfunc->update(data, length); + return hashfunc; +} + + +std::unique_ptr<HashFunction> HashFunction::create (const string &name, const string &data) { + return create(name, data.data(), data.length()); +} + + +std::unique_ptr<HashFunction> HashFunction::create (const string &name, const vector<uint8_t> &data) { + return create(name, reinterpret_cast<const char*>(data.data()), data.size()); +} + + +void HashFunction::update (istream &is) { + char buf[4096]; + while (is) { + is.read(buf, 4096); + update(buf, is.gcount()); + } +} + + +/** Returns the current digest as hexadecimal value. */ +string HashFunction::digestString () const { + ostringstream oss; + oss << hex << setfill('0'); + for (int byte : digestBytes()) + oss << setw(2) << byte; + return oss.str(); +} |