comparision functions.
Added all lztext comparision functions, operators and a default
operator class for nbtree on lztext.
Jan
/* ----------
* lztext.c -
*
- * $Header: /cvsroot/pgsql/src/backend/utils/adt/Attic/lztext.c,v 1.3 1999/11/24 03:45:12 ishii Exp $
+ * $Header: /cvsroot/pgsql/src/backend/utils/adt/Attic/lztext.c,v 1.4 1999/11/25 01:28:04 wieck Exp $
*
* Text type with internal LZ compressed representation. Uses the
* standard PostgreSQL compression method.
}
+/* ----------
+ * lztext_cmp -
+ *
+ * Comparision function for two lztext datum's.
+ *
+ * Returns -1, 0 or 1.
+ * ----------
+ */
+int32
+lztext_cmp(lztext *lz1, lztext *lz2)
+{
+#ifdef USE_LOCALE
+
+ char *cp1;
+ char *cp2;
+ int result;
+
+ if (lz1 == NULL || lz2 == NULL)
+ return (int32)0;
+
+ cp1 = lztextout(lz1);
+ cp2 = lztextout(lz2);
+
+ result = strcoll(cp1, cp2);
+
+ pfree(cp1);
+ pfree(cp2);
+
+ return result;
+
+#else /* !USE_LOCALE */
+
+ PGLZ_DecompState ds1;
+ PGLZ_DecompState ds2;
+ int c1;
+ int c2;
+ int32 result = (int32)0;
+
+ if (lz1 == NULL || lz2 == NULL)
+ return (int32)0;
+
+ pglz_decomp_init(&ds1, lz1);
+ pglz_decomp_init(&ds2, lz2);
+
+ for(;;)
+ {
+ c1 = pglz_decomp_getchar(&ds1);
+ c2 = pglz_decomp_getchar(&ds2);
+
+ if (c1 == EOF)
+ {
+ if (c2 != EOF)
+ result = (int32)-1;
+ break;
+ } else {
+ if (c2 == EOF)
+ {
+ result = (int32)1;
+ }
+ }
+ if (c1 != c2)
+ {
+ result = (int32)(c1 - c2);
+ break;
+ }
+ }
+
+ pglz_decomp_end(&ds1);
+ pglz_decomp_end(&ds2);
+
+ return result;
+
+#endif /* USE_LOCALE */
+}
+
+
+/* ----------
+ * lztext_eq ... -
+ *
+ * =, !=, >, >=, < and <= operator functions for two
+ * lztext datums.
+ * ----------
+ */
+bool
+lztext_eq(lztext *lz1, lztext *lz2)
+{
+ if (lz1 == NULL || lz2 == NULL)
+ return false;
+
+ return (bool)(lztext_cmp(lz1, lz2) == 0);
+}
+
+
+bool
+lztext_ne(lztext *lz1, lztext *lz2)
+{
+ if (lz1 == NULL || lz2 == NULL)
+ return false;
+
+ return (bool)(lztext_cmp(lz1, lz2) != 0);
+}
+
+
+bool
+lztext_gt(lztext *lz1, lztext *lz2)
+{
+ if (lz1 == NULL || lz2 == NULL)
+ return false;
+
+ return (bool)(lztext_cmp(lz1, lz2) > 0);
+}
+
+
+bool
+lztext_ge(lztext *lz1, lztext *lz2)
+{
+ if (lz1 == NULL || lz2 == NULL)
+ return false;
+
+ return (bool)(lztext_cmp(lz1, lz2) >= 0);
+}
+
+
+bool
+lztext_lt(lztext *lz1, lztext *lz2)
+{
+ if (lz1 == NULL || lz2 == NULL)
+ return false;
+
+ return (bool)(lztext_cmp(lz1, lz2) < 0);
+}
+
+
+bool
+lztext_le(lztext *lz1, lztext *lz2)
+{
+ if (lz1 == NULL || lz2 == NULL)
+ return false;
+
+ return (bool)(lztext_cmp(lz1, lz2) <= 0);
+}
+
+
/* ----------
* pg_lzcompress.c -
*
- * $Header: /cvsroot/pgsql/src/backend/utils/adt/pg_lzcompress.c,v 1.2 1999/11/17 22:18:45 wieck Exp $
+ * $Header: /cvsroot/pgsql/src/backend/utils/adt/pg_lzcompress.c,v 1.3 1999/11/25 01:28:04 wieck Exp $
*
* This is an implementation of LZ compression for PostgreSQL.
* It uses a simple history table and generates 2-3 byte tags
}
+/* ----------
+ * pglz_get_next_decomp_char_from_lzdata -
+ *
+ * Reads the next character from a decompression state if the
+ * input data to pglz_decomp_init() was in compressed format.
+ * ----------
+ */
+int
+pglz_get_next_decomp_char_from_lzdata(PGLZ_DecompState *dstate)
+{
+ unsigned char retval;
+
+ if (dstate->tocopy > 0)
+ {
+ /* ----------
+ * Copy one byte from output to output until we did it
+ * for the length specified by the last tag. Return that
+ * byte.
+ * ----------
+ */
+ dstate->tocopy--;
+ return (*(dstate->cp_out++) = *(dstate->cp_copy++));
+ }
+
+ if (dstate->ctrl_count == 0)
+ {
+ /* ----------
+ * Get the next control byte if we need to, but check
+ * for EOF before.
+ * ----------
+ */
+ if (dstate->cp_in == dstate->cp_end)
+ {
+ return EOF;
+ }
+
+ /* ----------
+ * This decompression method saves time only, if we stop near
+ * the beginning of the data (maybe because we're called by a
+ * comparision function and a difference occurs early). Otherwise,
+ * all the checks, needed here, cause too much overhead.
+ *
+ * Thus we decompress the entire rest at once into the temporary
+ * buffer and change the decomp state to return the prepared
+ * data from the buffer by the more simple calls to
+ * pglz_get_next_decomp_char_from_plain().
+ * ----------
+ */
+ if (dstate->cp_out - dstate->temp_buf >= 256)
+ {
+ unsigned char *cp_in = dstate->cp_in;
+ unsigned char *cp_out = dstate->cp_out;
+ unsigned char *cp_end = dstate->cp_end;
+ unsigned char *cp_copy;
+ unsigned char ctrl;
+ int off;
+ int len;
+ int i;
+
+ while (cp_in < cp_end)
+ {
+ ctrl = *cp_in++;
+
+ for (i = 0; i < 8; i++)
+ {
+ if (cp_in == cp_end)
+ break;
+
+ if (ctrl & 0x01)
+ {
+ len = (cp_in[0] & 0x0f) + 3;
+ off = ((cp_in[0] & 0xf0) << 4) | cp_in[1];
+ cp_in += 2;
+ if (len == 18)
+ len += *cp_in++;
+
+ cp_copy = cp_out - off;
+ while(len--)
+ *cp_out++ = *cp_copy++;
+ } else {
+ *cp_out++ = *cp_in++;
+ }
+ ctrl >>= 1;
+ }
+ }
+
+ dstate->cp_in = dstate->cp_out;
+ dstate->cp_end = cp_out;
+ dstate->next_char = pglz_get_next_decomp_char_from_plain;
+
+ return (int)(*(dstate->cp_in++));
+ }
+
+ /* ----------
+ * Not yet, get next control byte into decomp state.
+ * ----------
+ */
+ dstate->ctrl = (unsigned char)(*(dstate->cp_in++));
+ dstate->ctrl_count = 8;
+ }
+
+ /* ----------
+ * Check for EOF in tag/literal byte data.
+ * ----------
+ */
+ if (dstate->cp_in == dstate->cp_end)
+ {
+ return EOF;
+ }
+
+ /* ----------
+ * Handle next control bit.
+ * ----------
+ */
+ dstate->ctrl_count--;
+ if (dstate->ctrl & 0x01)
+ {
+ /* ----------
+ * Bit is set, so tag is following. Setup copy information
+ * and do the copy for the first byte as above.
+ * ----------
+ */
+ int off;
+
+ dstate->tocopy = (dstate->cp_in[0] & 0x0f) + 3;
+ off = ((dstate->cp_in[0] & 0xf0) << 4) | dstate->cp_in[1];
+ dstate->cp_in += 2;
+ if (dstate->tocopy == 18)
+ dstate->tocopy += *(dstate->cp_in++);
+ dstate->cp_copy = dstate->cp_out - off;
+
+ dstate->tocopy--;
+ retval = (*(dstate->cp_out++) = *(dstate->cp_copy++));
+ } else {
+ /* ----------
+ * Bit is unset, so literal byte follows.
+ * ----------
+ */
+ retval = (int)(*(dstate->cp_out++) = *(dstate->cp_in++));
+ }
+ dstate->ctrl >>= 1;
+
+ return (int)retval;
+}
+
+
+/* ----------
+ * pglz_get_next_decomp_char_from_plain -
+ *
+ * The input data to pglz_decomp_init() was stored in uncompressed
+ * format. So we don't have a temporary output buffer and simply
+ * return bytes from the input until EOF.
+ * ----------
+ */
+int
+pglz_get_next_decomp_char_from_plain(PGLZ_DecompState *dstate)
+{
+ if (dstate->cp_in >= dstate->cp_end)
+ return EOF;
+
+ return (int)(*(dstate->cp_in++));
+}
+
+
*
* Copyright (c) 1994, Regents of the University of California
*
- * $Id: pg_amop.h,v 1.24 1999/09/29 21:13:30 wieck Exp $
+ * $Id: pg_amop.h,v 1.25 1999/11/25 01:28:05 wieck Exp $
*
* NOTES
* the genbki.sh script reads this file and generates .bki
DATA(insert OID = 0 ( 403 1768 1757 4 btreesel btreenpage ));
DATA(insert OID = 0 ( 403 1768 1756 5 btreesel btreenpage ));
+/*
+ * nbtree lztext
+ */
+
+DATA(insert OID = 0 ( 403 1663 1659 1 btreesel btreenpage ));
+DATA(insert OID = 0 ( 403 1663 1660 2 btreesel btreenpage ));
+DATA(insert OID = 0 ( 403 1663 1657 3 btreesel btreenpage ));
+DATA(insert OID = 0 ( 403 1663 1662 4 btreesel btreenpage ));
+DATA(insert OID = 0 ( 403 1663 1661 5 btreesel btreenpage ));
+
/*
* hash table _ops
*/
*
* Copyright (c) 1994, Regents of the University of California
*
- * $Id: pg_amproc.h,v 1.15 1999/09/29 21:13:30 wieck Exp $
+ * $Id: pg_amproc.h,v 1.16 1999/11/25 01:28:05 wieck Exp $
*
* NOTES
* the genbki.sh script reads this file and generates .bki
DATA(insert OID = 0 (403 810 836 1));
DATA(insert OID = 0 (403 935 926 1));
DATA(insert OID = 0 (403 1768 1769 1));
+DATA(insert OID = 0 (403 1663 1636 1));
/* hash */
*
* Copyright (c) 1994, Regents of the University of California
*
- * $Id: pg_opclass.h,v 1.22 1999/11/23 04:47:39 momjian Exp $
+ * $Id: pg_opclass.h,v 1.23 1999/11/25 01:28:05 wieck Exp $
*
* NOTES
* the genbki.sh script reads this file and generates .bki
DESCR("");
DATA(insert OID = 1768 ( numeric_ops 1700 ));
DESCR("");
+DATA(insert OID = 1663 ( lztext_ops 1625 ));
+DESCR("");
#endif /* PG_OPCLASS_H */
*
* Copyright (c) 1994, Regents of the University of California
*
- * $Id: pg_operator.h,v 1.61 1999/11/22 17:56:37 momjian Exp $
+ * $Id: pg_operator.h,v 1.62 1999/11/25 01:28:05 wieck Exp $
*
* NOTES
* the genbki.sh script reads this file and generates .bki
DATA(insert OID = 1762 ( "%" PGUID 0 b t f 1700 1700 1700 0 0 0 0 numeric_mod - - ));
DATA(insert OID = 1763 ( "@" PGUID 0 l t f 0 1700 1700 0 0 0 0 numeric_abs - - ));
+/* LZTEXT type */
+DATA(insert OID = 1657 ( "=" PGUID 0 b t f 1625 1625 16 1657 1658 1659 1659 lztext_eq eqsel eqjoinsel ));
+DATA(insert OID = 1658 ( "<>" PGUID 0 b t f 1625 1625 16 1658 1657 0 0 lztext_ne neqsel neqjoinsel ));
+DATA(insert OID = 1659 ( "<" PGUID 0 b t f 1625 1625 16 1661 1662 0 0 lztext_lt intltsel intltjoinsel ));
+DATA(insert OID = 1660 ( "<=" PGUID 0 b t f 1625 1625 16 1662 1661 0 0 lztext_le intltsel intltjoinsel ));
+DATA(insert OID = 1661 ( ">" PGUID 0 b t f 1625 1625 16 1659 1660 0 0 lztext_gt intgtsel intgtjoinsel ));
+DATA(insert OID = 1662 ( ">=" PGUID 0 b t f 1625 1625 16 1660 1659 0 0 lztext_ge intgtsel intgtjoinsel ));
+
/*
*
* Copyright (c) 1994, Regents of the University of California
*
- * $Id: pg_proc.h,v 1.106 1999/11/17 21:21:50 wieck Exp $
+ * $Id: pg_proc.h,v 1.107 1999/11/25 01:28:05 wieck Exp $
*
* NOTES
* The script catalog/genbki.sh reads this file and generates .bki
DESCR("octet length");
DATA(insert OID = 1635 ( octet_length PGUID 11 f t t 1 f 23 "1625" 100 0 1 0 lztextoctetlen - ));
DESCR("octet length");
+DATA(insert OID = 1636 ( lztext_cmp PGUID 11 f t t 2 f 23 "1625 1625" 100 0 1 0 lztext_cmp - ));
+DESCR("compare lztext vs. lztext");
+DATA(insert OID = 1637 ( lztext_eq PGUID 11 f t t 2 f 16 "1625 1625" 100 0 1 0 lztext_eq - ));
+DESCR("equal");
+DATA(insert OID = 1638 ( lztext_ne PGUID 11 f t t 2 f 16 "1625 1625" 100 0 1 0 lztext_ne - ));
+DESCR("not equal");
+DATA(insert OID = 1639 ( lztext_gt PGUID 11 f t t 2 f 16 "1625 1625" 100 0 1 0 lztext_gt - ));
+DESCR("greater-than");
+DATA(insert OID = 1654 ( lztext_ge PGUID 11 f t t 2 f 16 "1625 1625" 100 0 1 0 lztext_ge - ));
+DESCR("greater-than-or-equal");
+DATA(insert OID = 1655 ( lztext_lt PGUID 11 f t t 2 f 16 "1625 1625" 100 0 1 0 lztext_lt - ));
+DESCR("lower-than");
+DATA(insert OID = 1656 ( lztext_le PGUID 11 f t t 2 f 16 "1625 1625" 100 0 1 0 lztext_le - ));
+DESCR("lower-than-or-equal");
/*
*
* Copyright (c) 1994, Regents of the University of California
*
- * $Id: builtins.h,v 1.90 1999/11/17 21:21:51 wieck Exp $
+ * $Id: builtins.h,v 1.91 1999/11/25 01:28:07 wieck Exp $
*
* NOTES
* This should normally only be included by fmgr.h.
lztext *text_lztext(text *txt);
int32 lztextlen(lztext *lz);
int32 lztextoctetlen(lztext *lz);
+int32 lztext_cmp(lztext *lz1, lztext *lz2);
+bool lztext_eq(lztext *lz1, lztext *lz2);
+bool lztext_ne(lztext *lz1, lztext *lz2);
+bool lztext_gt(lztext *lz1, lztext *lz2);
+bool lztext_ge(lztext *lz1, lztext *lz2);
+bool lztext_lt(lztext *lz1, lztext *lz2);
+bool lztext_le(lztext *lz1, lztext *lz2);
#endif /* BUILTINS_H */
/* ----------
* pg_lzcompress.h -
*
- * $Header: /cvsroot/pgsql/src/include/utils/pg_lzcompress.h,v 1.2 1999/11/17 22:18:46 wieck Exp $
+ * $Header: /cvsroot/pgsql/src/include/utils/pg_lzcompress.h,v 1.3 1999/11/25 01:28:07 wieck Exp $
*
* Definitions for the builtin LZ compressor
* ----------
} PGLZ_Strategy;
+/* ----------
+ * PGLZ_DecompState -
+ *
+ * Decompression state variable for byte-per-byte decompression
+ * using pglz_decomp_getchar() macro.
+ * ----------
+ */
+typedef struct PGLZ_DecompState {
+ unsigned char *temp_buf;
+ unsigned char *cp_in;
+ unsigned char *cp_end;
+ unsigned char *cp_out;
+ unsigned char *cp_copy;
+ int (*next_char)(struct PGLZ_DecompState *dstate);
+ int tocopy;
+ int ctrl_count;
+ unsigned char ctrl;
+} PGLZ_DecompState;
+
+
/* ----------
* The standard strategies
*
extern PGLZ_Strategy *PGLZ_strategy_never;
+/* ----------
+ * pglz_decomp_getchar -
+ *
+ * Get next character (or EOF) from decompressor.
+ * The status variable must be initialized before and deinitialized
+ * after compression with the next two macros below.
+ * ----------
+ */
+#define pglz_decomp_getchar(_ds) \
+ ((*((_ds)->next_char))((_ds)))
+
+
+/* ----------
+ * pglz_decomp_init -
+ *
+ * Initialize a decomp state from a compressed input.
+ * ----------
+ */
+#define pglz_decomp_init(_ds,_lz) { \
+ (_ds)->cp_in = ((unsigned char *)(_lz)) \
+ + sizeof(PGLZ_Header); \
+ (_ds)->cp_end = (_ds)->cp_in + (_lz)->varsize \
+ - sizeof(PGLZ_Header); \
+ if (PGLZ_IS_COMPRESSED((_lz))) { \
+ (_ds)->temp_buf = (unsigned char *) \
+ palloc(PGLZ_RAW_SIZE((_lz))); \
+ (_ds)->cp_out = (_ds)->temp_buf; \
+ (_ds)->next_char = pglz_get_next_decomp_char_from_lzdata; \
+ (_ds)->tocopy = 0; \
+ (_ds)->ctrl_count = 0; \
+ } else { \
+ (_ds)->temp_buf = NULL; \
+ (_ds)->next_char = pglz_get_next_decomp_char_from_plain; \
+ } \
+ }
+
+
+/* ----------
+ * pglz_decomp_end -
+ *
+ * Deallocate resources after decompression.
+ * ----------
+ */
+#define pglz_decomp_end(_ds) { \
+ if ((_ds)->temp_buf != NULL) \
+ pfree((void *)((_ds)->temp_buf)); \
+ }
+
+
/* ----------
* Global function declarations
* ----------
int pglz_decompress (PGLZ_Header *source, char *dest);
+/* ----------
+ * Functions used by pglz_decomp_getchar().
+ * Internal use only.
+ * ----------
+ */
+extern int pglz_get_next_decomp_char_from_lzdata(PGLZ_DecompState *dstate);
+extern int pglz_get_next_decomp_char_from_plain(PGLZ_DecompState *dstate);
+
#endif /* _PG_LZCOMPRESS_H_ */
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