58 lines
2.1 KiB
C++
58 lines
2.1 KiB
C++
/*
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* Copyright (c) 2015 Cryptonomex, Inc., and contributors.
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*
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* The MIT License
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#pragma once
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namespace graphene { namespace utilities {
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template<size_t BlockSize=16, char PaddingChar=' '>
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class padding_ostream : public fc::buffered_ostream {
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public:
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padding_ostream( fc::ostream_ptr o, size_t bufsize = 4096 ) : buffered_ostream(o, bufsize) {}
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virtual ~padding_ostream() {}
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virtual size_t writesome( const char* buffer, size_t len ) {
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auto out = buffered_ostream::writesome(buffer, len);
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bytes_out += out;
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bytes_out %= BlockSize;
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return out;
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}
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virtual size_t writesome( const std::shared_ptr<const char>& buf, size_t len, size_t offset ) {
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auto out = buffered_ostream::writesome(buf, len, offset);
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bytes_out += out;
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bytes_out %= BlockSize;
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return out;
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}
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virtual void flush() {
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static const char pad = PaddingChar;
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while( bytes_out % BlockSize )
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writesome(&pad, 1);
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buffered_ostream::flush();
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}
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private:
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size_t bytes_out = 0;
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};
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} } //graphene::utilities
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