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-rw-r--r--src/include/mb/pg_wchar.h53
1 files changed, 0 insertions, 53 deletions
diff --git a/src/include/mb/pg_wchar.h b/src/include/mb/pg_wchar.h
index 31f5b39..4a0e6bf 100644
--- a/src/include/mb/pg_wchar.h
+++ b/src/include/mb/pg_wchar.h
@@ -699,57 +699,4 @@ extern int mic2latin_with_table(const unsigned char *mic, unsigned char *p,
extern WCHAR *pgwin32_message_to_UTF16(const char *str, int len, int *utf16len);
#endif
-
-/*
- * Verify a chunk of bytes for valid ASCII.
- *
- * Returns false if the input contains any zero bytes or bytes with the
- * high-bit set. Input len must be a multiple of 8.
- */
-static inline bool
-is_valid_ascii(const unsigned char *s, int len)
-{
- uint64 chunk,
- highbit_cum = UINT64CONST(0),
- zero_cum = UINT64CONST(0x8080808080808080);
-
- Assert(len % sizeof(chunk) == 0);
-
- while (len > 0)
- {
- memcpy(&chunk, s, sizeof(chunk));
-
- /*
- * Capture any zero bytes in this chunk.
- *
- * First, add 0x7f to each byte. This sets the high bit in each byte,
- * unless it was a zero. If any resulting high bits are zero, the
- * corresponding high bits in the zero accumulator will be cleared.
- *
- * If none of the bytes in the chunk had the high bit set, the max
- * value each byte can have after the addition is 0x7f + 0x7f = 0xfe,
- * and we don't need to worry about carrying over to the next byte. If
- * any input bytes did have the high bit set, it doesn't matter
- * because we check for those separately.
- */
- zero_cum &= (chunk + UINT64CONST(0x7f7f7f7f7f7f7f7f));
-
- /* Capture any set bits in this chunk. */
- highbit_cum |= chunk;
-
- s += sizeof(chunk);
- len -= sizeof(chunk);
- }
-
- /* Check if any high bits in the high bit accumulator got set. */
- if (highbit_cum & UINT64CONST(0x8080808080808080))
- return false;
-
- /* Check if any high bits in the zero accumulator got cleared. */
- if (zero_cum != UINT64CONST(0x8080808080808080))
- return false;
-
- return true;
-}
-
#endif /* PG_WCHAR_H */