From: Sandro Santilli <strk@keybit.net>
Date: Thu, 18 Nov 2004 18:14:19 +0000 (+0000)
Subject: Added a copy of the PQunescapeBytea function found in libpq of PG>=73
X-Git-Tag: pgis_1_0_0RC1~193
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=356c91a09fbaf855d794f08d4abdcf2ffa453fdb;p=postgis

Added a copy of the PQunescapeBytea function found in libpq of PG>=73


git-svn-id: http://svn.osgeo.org/postgis/trunk@1102 b70326c6-7e19-0410-871a-916f4a2858ee
---

diff --git a/loader/Makefile b/loader/Makefile
index 37444054f..54b4a304f 100644
--- a/loader/Makefile
+++ b/loader/Makefile
@@ -12,7 +12,7 @@ ifeq ($(findstring CYGWIN,$(shell uname)),CYGWIN)
 	EXE = .exe
 endif
 
-OBJS = shpopen.o dbfopen.o getopt.o
+OBJS = shpopen.o dbfopen.o getopt.o PQunescapeBytea.o
 
 #---------------------------------------------------------------
 
diff --git a/loader/PQunescapeBytea.c b/loader/PQunescapeBytea.c
new file mode 100644
index 000000000..05fdc7adc
--- /dev/null
+++ b/loader/PQunescapeBytea.c
@@ -0,0 +1,110 @@
+/***************************************************************************
+ * This has been copied from:
+ *      PostgreSQL: pgsql/src/interfaces/libpq/fe-exec.c,v
+ *	1.165 2004/10/21 19:28:36 tgl Exp 
+ *
+ * Portions Copyright (c) 1996-2004, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ **************************************************************************/
+
+#include <stdlib.h>
+#include <ctype.h>
+#include <stdio.h>
+#include "compat.h"
+
+#if USE_VERSION < 73
+
+#define ISFIRSTOCTDIGIT(CH) ((CH) >= '0' && (CH) <= '3')
+#define ISOCTDIGIT(CH) ((CH) >= '0' && (CH) <= '7')
+#define OCTVAL(CH) ((CH) - '0')
+
+/*
+ *              PQunescapeBytea - converts the null terminated string representation
+ *              of a bytea, strtext, into binary, filling a buffer. It returns a
+ *              pointer to the buffer (or NULL on error), and the size of the
+ *              buffer in retbuflen. The pointer may subsequently be used as an
+ *              argument to the function free(3). It is the reverse of PQescapeBytea.
+ *
+ *              The following transformations are made:
+ *              \\       == ASCII 92 == \
+ *              \ooo == a byte whose value = ooo (ooo is an octal number)
+ *              \x       == x (x is any character not matched by the above transformations)
+ */
+unsigned char *
+PQunescapeBytea(const unsigned char *strtext, size_t *retbuflen)
+{
+        size_t          strtextlen,
+                                buflen;
+        unsigned char *buffer,
+                           *tmpbuf;
+        size_t          i,
+                                j;
+
+        if (strtext == NULL)
+                return NULL;
+
+        strtextlen = strlen(strtext);
+
+        /*
+         * Length of input is max length of output, but add one to avoid
+         * unportable malloc(0) if input is zero-length.
+         */
+        buffer = (unsigned char *) malloc(strtextlen + 1);
+        if (buffer == NULL)
+                return NULL;
+
+        for (i = j = 0; i < strtextlen;)
+        {
+                switch (strtext[i])
+                {
+                        case '\\':
+                                i++;
+                                if (strtext[i] == '\\')
+                                        buffer[j++] = strtext[i++];
+                                else
+                                {
+                                        if ((ISFIRSTOCTDIGIT(strtext[i])) &&
+                                                (ISOCTDIGIT(strtext[i + 1])) &&
+                                                (ISOCTDIGIT(strtext[i + 2])))
+                                        {
+                                                int                     byte;
+
+                                                byte = OCTVAL(strtext[i++]);
+                                                byte = (byte << 3) + OCTVAL(strtext[i++]);
+                                                byte = (byte << 3) + OCTVAL(strtext[i++]);
+                                                buffer[j++] = byte;
+                                        }
+                                }
+
+                                /*
+                                 * Note: if we see '\' followed by something that isn't a
+                                 * recognized escape sequence, we loop around having done
+                                 * nothing except advance i.  Therefore the something will
+                                 * be emitted as ordinary data on the next cycle. Corner
+                                 * case: '\' at end of string will just be discarded.
+                                 */
+                                break;
+
+                        default:
+                                buffer[j++] = strtext[i++];
+                                break;
+                }
+        }
+        buflen = j;                                     /* buflen is the length of the dequoted
+                                                                 * data */
+
+        /* Shrink the buffer to be no larger than necessary */
+        /* +1 avoids unportable behavior when buflen==0 */
+        tmpbuf = realloc(buffer, buflen + 1);
+
+        /* It would only be a very brain-dead realloc that could fail, but... */
+        if (!tmpbuf)
+        {
+                free(buffer);
+                return NULL;
+        }
+
+        *retbuflen = buflen;
+        return tmpbuf;
+}
+#endif // USE_VERSION < 73
diff --git a/loader/compat.h b/loader/compat.h
new file mode 100644
index 000000000..3955cfaf6
--- /dev/null
+++ b/loader/compat.h
@@ -0,0 +1,12 @@
+#ifndef _COMPAT_H
+#define _COMPAT_H 1
+
+#include <stdlib.h>
+#include <ctype.h>
+#include <stdio.h>
+
+#if USE_VERSION < 73
+unsigned char *PQunescapeBytea(const unsigned char *strtext, size_t *retbuflen);
+#endif
+
+#endif // ifndef _COMPAT_H
diff --git a/loader/pgsql2shp.c b/loader/pgsql2shp.c
index 065b9ee22..ffaf0d087 100644
--- a/loader/pgsql2shp.c
+++ b/loader/pgsql2shp.c
@@ -26,6 +26,7 @@ static char rcsid[] =
 #include "libpq-fe.h"
 #include "shapefil.h"
 #include "getopt.h"
+#include "compat.h"
 
 #ifdef __CYGWIN__
 #include <sys/param.h>       
@@ -48,7 +49,7 @@ static char rcsid[] =
 #define VERBOSE 1
 
 /* Define this to use HEX encoding instead of bytea encoding */
-#define HEXWKB
+#define HEXWKB 1
 
 typedef unsigned long int uint32;
 typedef unsigned char byte;
@@ -3086,6 +3087,9 @@ create_usrquerytable()
 
 /**********************************************************************
  * $Log$
+ * Revision 1.68  2004/11/18 18:14:19  strk
+ * Added a copy of the PQunescapeBytea function found in libpq of PG>=73
+ *
  * Revision 1.67  2004/10/17 12:16:47  strk
  * fixed prototype for user query table
  *