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Parse RDA Adaptation Data (Message Type 18)

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This commit is contained in:
Dan Paulat 2021-06-18 21:54:05 -05:00
parent 3ab4ec4b9b
commit 3ae8eb24ab
6 changed files with 1074 additions and 3 deletions
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71
wxdata/source/scwx/util/vectorbuf.cpp
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@ -15,5 +15,76 @@ void vectorbuf::update_read_pointers(size_t size)
setg(v_.data(), v_.data(), v_.data() + size);
}
vectorbuf::pos_type vectorbuf::seekoff(std::streamoff off,
std::ios_base::seekdir way,
std::ios_base::openmode which)
{
// Adapted from Microsoft stringbuf reference implementation
// Copyright (c) Microsoft Corporation.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// Change position by off, according to way, which
const auto gptrOld = gptr();
const auto pptrOld = pptr();
const auto seekHigh = (pptrOld == nullptr) ? egptr() : pptr();
const auto seekLow = eback();
const auto seekDist = seekHigh - seekLow;
off_type newOffset;
switch (way)
{
case std::ios_base::beg: newOffset = 0; break;
case std::ios_base::end: newOffset = seekDist; break;
case std::ios_base::cur:
{
constexpr auto BOTH = std::ios_base::in | std::ios_base::out;
if ((which & BOTH) != BOTH)
{
if (which & std::ios_base::in)
{
if (gptrOld || !seekLow)
{
newOffset = gptrOld - seekLow;
break;
}
}
else if ((which & std::ios_base::out) && (pptrOld || !seekLow))
{
newOffset = pptrOld - seekLow;
break;
}
}
}
default: return pos_type(off_type(-1));
}
if (static_cast<unsigned long long>(off) + newOffset >
static_cast<unsigned long long>(seekDist))
{
return pos_type(off_type(-1));
}
off += newOffset;
if (off != 0 && (((which & std::ios_base::in) && !gptrOld) ||
((which & std::ios_base::out) && !pptrOld)))
{
return pos_type(off_type(-1));
}
const auto next = seekLow + off;
if ((which & std::ios_base::in) && gptrOld)
{
setg(seekLow, next, seekHigh);
}
if ((which & std::ios_base::out) && pptrOld)
{
setp(seekLow, next, epptr());
}
return pos_type(off);
}
} // namespace util
} // namespace scwx