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Added methods to write small ints to bit streams.

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Summary: Added BitStreamPutInt() and BitStreamGetInt() which take a stream of chars and can write integers of arbitrary bit sizes to that stream at arbitrary positions. There are also convenience versions of these functions that take std::strings and leveldb::Slices.

Test Plan: make check

Reviewers: sheki, vamsi, dhruba, emayanke

Reviewed By: vamsi

CC: leveldb

Differential Revision: https://reviews.facebook.net/D7071
This commit is contained in:
Kosie van der Merwe
2012-12-07 10:42:19 -08:00
parent c847a31727
commit 0eb0c9bb82
3 changed files with 219 additions and 0 deletions
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26
util/coding.h
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@@ -99,6 +99,32 @@ inline const char* GetVarint32Ptr(const char* p,
return GetVarint32PtrFallback(p, limit, value);
}
// Writes an unsigned integer with bits number of bits with its least
// significant bit at offset.
// Bits are numbered from 0 to 7 in the first byte, 8 to 15 in the second and
// so on.
// value is truncated to the bits number of least significant bits.
// REQUIRES: (offset+bits+7)/8 <= dstlen
// REQUIRES: bits <= 64
extern void BitStreamPutInt(char* dst, size_t dstlen, size_t offset,
uint32_t bits, uint64_t value);
// Reads an unsigned integer with bits number of bits with its least
// significant bit at offset.
// Bits are numbered in the same way as ByteStreamPutInt().
// REQUIRES: (offset+bits+7)/8 <= srclen
// REQUIRES: bits <= 64
extern uint64_t BitStreamGetInt(const char* src, size_t srclen, size_t offset,
uint32_t bits);
// Convenience functions
extern void BitStreamPutInt(std::string* dst, size_t offset, uint32_t bits,
uint64_t value);
extern uint64_t BitStreamGetInt(const std::string* src, size_t offset,
uint32_t bits);
extern uint64_t BitStreamGetInt(const Slice* src, size_t offset,
uint32_t bits);
} // namespace leveldb
#endif // STORAGE_LEVELDB_UTIL_CODING_H_