mirror of
https://github.com/LongSoft/UEFITool.git
synced 2024-11-24 00:48:23 +08:00
59 lines
1.7 KiB
C
59 lines
1.7 KiB
C
|
/* umemstream.h
|
||
|
|
|
||
|
|
Copyright (c) 2023, Nikolaj Schlej. All rights reserved.
|
||
|
|
This program and the accompanying materials
|
||
|
|
are licensed and made available under the terms and conditions of the BSD License
|
||
|
|
which accompanies this distribution. The full text of the license may be found at
|
||
|
|
http://opensource.org/licenses/bsd-license.php
|
||
|
|
|
||
|
|
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
|
||
|
|
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
|
||
|
|
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef UMEMSTREAM_H
|
||
|
|
#define UMEMSTREAM_H
|
||
|
|
|
||
|
|
#include <sstream>
|
||
|
|
|
||
|
|
// NOTE: this implementation is certainly not a valid replacement to std::stringstream
|
||
|
|
// NOTE: because it only supports getting through the buffer once
|
||
|
|
// NOTE: however, we already do it this way, so it's enough for practical purposes
|
||
|
|
|
||
|
|
class umembuf : public std::streambuf {
|
||
|
|
public:
|
||
|
|
umembuf(const char *p, size_t l) {
|
||
|
|
setg((char*)p, (char*)p, (char*)p + l);
|
||
|
|
}
|
||
|
|
|
||
|
|
pos_type seekoff(off_type off, std::ios_base::seekdir dir, std::ios_base::openmode which = std::ios_base::in) override
|
||
|
|
{
|
||
|
|
(void)which;
|
||
|
|
if (dir == std::ios_base::cur)
|
||
|
|
gbump((int)off);
|
||
|
|
else if (dir == std::ios_base::end)
|
||
|
|
setg(eback(), egptr() + off, egptr());
|
||
|
|
else if (dir == std::ios_base::beg)
|
||
|
|
setg(eback(), eback() + off, egptr());
|
||
|
|
return gptr() - eback();
|
||
|
|
}
|
||
|
|
|
||
|
|
pos_type seekpos(pos_type sp, std::ios_base::openmode which) override
|
||
|
|
{
|
||
|
|
return seekoff(sp - pos_type(off_type(0)), std::ios_base::beg, which);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
class umemstream : public std::istream {
|
||
|
|
public:
|
||
|
|
umemstream(const char *p, size_t l) : std::istream(&buffer_),
|
||
|
|
buffer_(p, l) {
|
||
|
|
rdbuf(&buffer_);
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
umembuf buffer_;
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif // UMEMSTREAM_H
|