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ndb - Fixed bitfields of upto 31 bits

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This commit is contained in:
joreland@mysql.com
2004-12-08 17:58:00 +01:00
parent c97f6e2454
commit 9a937a3b22
2 changed files with 151 additions and 90 deletions
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27
ndb/include/util/Bitmask.hpp
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@@ -811,36 +811,45 @@ public:
};
inline void
BitmaskImpl::getField(unsigned size, const Uint32 data[],
BitmaskImpl::getField(unsigned size, const Uint32 src[],
unsigned pos, unsigned len, Uint32 dst[])
{
assert(len > 0);
assert(pos + len < (size << 5));
Uint32 word = pos >> 5;
src += (pos >> 5);
Uint32 offset = pos & 31;
dst[0] = (* src >> offset) & (len >= 32 ? ~0 : (1 << len) - 1);
if(offset + len <= 32)
{
dst[0] = (data[word] >> offset) & ((1 << len) - 1);
return;
}
getFieldImpl(data, pos, len, dst);
Uint32 used = (32 - offset);
assert(len > used);
getFieldImpl(src+1, used & 31, len-used, dst+(used >> 5));
}
inline void
BitmaskImpl::setField(unsigned size, Uint32 data[],
BitmaskImpl::setField(unsigned size, Uint32 dst[],
unsigned pos, unsigned len, const Uint32 src[])
{
assert(len > 0);
assert(pos + len < (size << 5));
Uint32 word = pos >> 5;
dst += (pos >> 5);
Uint32 offset = pos & 31;
Uint32 mask = ((1 << len) - 1) << offset;
data[word] = (data[word] & ~mask) | ((src[0] << offset) & mask);
Uint32 mask = (len >= 32 ? ~0 : (1 << len) - 1) << offset;
* dst = (* dst & ~mask) | ((*src << offset) & mask);
if(offset + len <= 32)
{
return;
}
setFieldImpl(data, pos, len, src);
Uint32 used = (32 - offset);
assert(len > used);
setFieldImpl(dst+1, used & 31, len-used, src+(used >> 5));
}