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58 lines
1.7 KiB
C++
58 lines
1.7 KiB
C++
/* umemstream.h
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Copyright (c) 2023, Nikolaj Schlej. All rights reserved.
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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*/
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#ifndef UMEMSTREAM_H
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#define UMEMSTREAM_H
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#include <sstream>
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// NOTE: this implementation is certainly not a valid replacement to std::stringstream
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// NOTE: because it only supports getting through the buffer once
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// NOTE: however, we already do it this way, so it's enough for practical purposes
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class umembuf : public std::streambuf {
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public:
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umembuf(const char *p, size_t l) {
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setg((char*)p, (char*)p, (char*)p + l);
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}
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pos_type seekoff(off_type off, std::ios_base::seekdir dir, std::ios_base::openmode which = std::ios_base::in) override
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{
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(void)which;
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if (dir == std::ios_base::cur)
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gbump((int)off);
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else if (dir == std::ios_base::end)
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setg(eback(), egptr() + off, egptr());
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else if (dir == std::ios_base::beg)
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setg(eback(), eback() + off, egptr());
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return gptr() - eback();
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}
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pos_type seekpos(pos_type sp, std::ios_base::openmode which) override
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{
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return seekoff(sp - pos_type(off_type(0)), std::ios_base::beg, which);
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}
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};
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class umemstream : public std::istream {
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public:
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umemstream(const char *p, size_t l) : std::istream(&buffer_),
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buffer_(p, l) {
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rdbuf(&buffer_);
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}
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private:
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umembuf buffer_;
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};
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#endif // UMEMSTREAM_H
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