1 files changed, 345 insertions, 0 deletions
diff --git a/contrib/pgcrypto/encode.c b/contrib/pgcrypto/encode.c
new file mode 100644
index 00000000000..e7e19317b05
--- /dev/null
+++ b/contrib/pgcrypto/encode.c
@@ -0,0 +1,345 @@
+/*
+ * encode.c
+ *		Various data encoding/decoding things.
+ * 
+ * Copyright (c) 2001 Marko Kreen
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $Id: encode.c,v 1.1 2001/01/24 03:46:16 momjian Exp $
+ */
+
+#include <postgres.h>
+#include <fmgr.h>
+
+#include "encode.h"
+
+/*
+ * NAMEDATALEN is used for hash names
+ */
+#if NAMEDATALEN < 16
+#error "NAMEDATALEN < 16: too small"
+#endif
+
+static pg_coding *
+find_coding(pg_coding *hbuf, text *name, int silent);
+static pg_coding *
+pg_find_coding(pg_coding *res, char *name);
+
+
+/* SQL function: encode(bytea, text) returns text */
+PG_FUNCTION_INFO_V1(encode);
+
+Datum
+encode(PG_FUNCTION_ARGS)
+{
+	text *arg;
+	text *name;
+	uint len, rlen, rlen0;
+	pg_coding *c, cbuf;
+	text *res;
+	
+	if (PG_ARGISNULL(0) || PG_ARGISNULL(1))
+		PG_RETURN_NULL();
+	
+	name = PG_GETARG_TEXT_P(1);	
+	c = find_coding(&cbuf, name, 0); /* will give error if fails */
+
+	arg = PG_GETARG_TEXT_P(0);
+	len = VARSIZE(arg) - VARHDRSZ;
+	
+	rlen0 = c->encode_len(len);
+	
+	res = (text *)palloc(rlen0 + VARHDRSZ);
+	
+	rlen = c->encode(VARDATA(arg), len, VARDATA(res));
+	VARATT_SIZEP(res) = rlen + VARHDRSZ;
+
+	if (rlen > rlen0)
+		elog(FATAL, "pg_encode: overflow, encode estimate too small");
+	
+	PG_FREE_IF_COPY(arg, 0);
+	PG_FREE_IF_COPY(name, 0);
+	
+	PG_RETURN_TEXT_P(res);
+}
+
+/* SQL function: decode(text, text) returns bytea */
+PG_FUNCTION_INFO_V1(decode);
+
+Datum
+decode(PG_FUNCTION_ARGS)
+{
+	text *arg;
+	text *name;
+	uint len, rlen, rlen0;
+	pg_coding *c, cbuf;
+	text *res;
+	
+	if (PG_ARGISNULL(0) || PG_ARGISNULL(1))
+		PG_RETURN_NULL();
+	
+	name = PG_GETARG_TEXT_P(1);	
+	c = find_coding(&cbuf, name, 0); /* will give error if fails */
+
+	arg = PG_GETARG_TEXT_P(0);
+	len = VARSIZE(arg) - VARHDRSZ;
+	
+	rlen0 = c->decode_len(len);
+	
+	res = (text *)palloc(rlen0 + VARHDRSZ);
+	
+	rlen = c->decode(VARDATA(arg), len, VARDATA(res));
+	VARATT_SIZEP(res) = rlen + VARHDRSZ;
+
+	if (rlen > rlen0)
+		elog(FATAL, "pg_decode: overflow, decode estimate too small");
+	
+	PG_FREE_IF_COPY(arg, 0);
+	PG_FREE_IF_COPY(name, 0);
+	
+	PG_RETURN_TEXT_P(res);
+}
+
+static pg_coding *
+find_coding(pg_coding *dst, text *name, int silent)
+{
+	pg_coding *p;
+	char buf[NAMEDATALEN];
+	uint len;
+	
+	len = VARSIZE(name) - VARHDRSZ;
+	if (len >= NAMEDATALEN) {
+		if (silent)
+			return NULL;
+		elog(ERROR, "Encoding type does not exist (name too long)");
+	}
+		
+	memcpy(buf, VARDATA(name), len);
+	buf[len] = 0;
+	
+	p = pg_find_coding(dst, buf);
+
+	if (p == NULL && !silent)
+		elog(ERROR, "Encoding type does not exist: '%s'", buf);
+	return p;
+}
+
+static char *hextbl = "0123456789abcdef";
+
+uint
+hex_encode(uint8 *src, uint len, uint8 *dst)
+{
+	uint8 *end = src + len;
+	while (src < end) {
+		*dst++ = hextbl[(*src >> 4) & 0xF];
+		*dst++ = hextbl[*src & 0xF];
+		src++;
+	}
+	return len*2;
+}
+
+/* probably should use lookup table */
+static uint8
+get_hex(char c)
+{
+	uint8 res = 0;
+	
+	if (c >= '0' && c <= '9')
+		res = c - '0';
+	else if (c >= 'a' && c <= 'f')
+		res = c - 'a' + 10;
+	else if (c >= 'A' && c <= 'F')
+		res = c - 'A' + 10;
+	else
+		elog(ERROR, "Bad hex code: '%c'", c);
+	
+	return res;
+}
+
+uint
+hex_decode(uint8 *src, uint len, uint8 *dst)
+{
+	uint8 *s, *srcend, v1, v2, *p = dst;
+	
+	srcend = src + len;
+	s = src; p = dst;
+	while (s < srcend) {
+		if (*s == ' ' || *s == '\n' || *s == '\t' || *s == '\r') {
+			s++;
+			continue;
+		}
+		v1 = get_hex(*s++) << 4;
+		if (s >= srcend)
+			elog(ERROR, "hex_decode: invalid data");
+		v2 = get_hex(*s++);
+		*p++ = v1 | v2;
+	}
+	
+	return p - dst;
+}
+
+
+static unsigned char _base64[] =
+	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+uint
+b64_encode(uint8 *src, uint len, uint8 *dst)
+{
+	uint8 *s, *p, *end = src + len, *lend = dst + 76;
+	int pos = 2;
+	unsigned long buf = 0;
+
+	s = src; p = dst;
+	
+	while (s < end) {
+		buf |= *s << (pos << 3);
+		pos--;
+		s++;
+		
+		/* write it out */
+		if (pos < 0) {
+			*p++ = _base64[(buf >> 18) & 0x3f];
+			*p++ = _base64[(buf >> 12) & 0x3f];
+			*p++ = _base64[(buf >> 6) & 0x3f];
+			*p++ = _base64[buf & 0x3f];
+
+			pos = 2;
+			buf = 0;
+		}
+		if (p >= lend) {
+			*p++ = '\n';
+			lend = p + 76;
+		}
+	}
+	if (pos != 2) {
+		*p++ = _base64[(buf >> 18) & 0x3f];
+		*p++ = _base64[(buf >> 12) & 0x3f];
+		*p++ = (pos == 0) ? _base64[(buf >> 6) & 0x3f] : '=';
+		*p++ = '=';
+	}
+
+	return p - dst;
+}
+
+/* probably should use lookup table */
+uint
+b64_decode(uint8 *src, uint len, uint8 *dst)
+{
+	char *srcend = src + len, *s = src;
+	uint8 *p = dst;
+	char c;
+	uint b = 0;
+	unsigned long buf = 0;
+	int pos = 0, end = 0;
+	
+	while (s < srcend) {
+		c = *s++;
+		if (c >= 'A' && c <= 'Z')
+			b = c - 'A';
+		else if (c >= 'a' && c <= 'z')
+			b = c - 'a' + 26;
+		else if (c >= '0' && c <= '9')
+			b = c - '0' + 52;
+		else if (c == '+')
+			b = 62;
+		else if (c == '/')
+			b = 63;
+		else if (c == '=') {
+			/* end sequence */
+			if (!end) {
+				if (pos == 2) end = 1;
+				else if (pos == 3) end = 2;
+				else
+					elog(ERROR, "base64: unexpected '='");
+			}
+			b = 0;
+		} else if (c == ' ' || c == '\t' || c == '\n' || c == '\r')
+			continue;
+		else
+			elog(ERROR, "base64: Invalid symbol");
+
+		/* add it to buffer */
+		buf = (buf << 6) + b;
+		pos++;
+		if (pos == 4) {
+			*p++ = (buf >> 16) & 255;
+			if (end == 0 || end > 1)
+				*p++ = (buf >> 8) & 255;
+			if (end == 0 || end > 2)
+				*p++ = buf & 255;
+			buf = 0;
+			pos = 0;
+		}
+	}
+
+	if (pos != 0)
+		elog(ERROR, "base64: invalid end sequence");
+
+	return p - dst;
+}
+
+
+uint
+hex_enc_len(uint srclen)
+{
+	return srclen << 1;
+}
+
+uint
+hex_dec_len(uint srclen)
+{
+	return srclen >> 1;
+}
+
+uint
+b64_enc_len(uint srclen)
+{
+	return srclen + (srclen / 3) + (srclen / (76 / 2));
+}
+
+uint
+b64_dec_len(uint srclen)
+{
+	return (srclen * 3) >> 2;
+}
+
+static pg_coding
+encoding_list [] = {
+	{ "hex", hex_enc_len, hex_dec_len, hex_encode, hex_decode},
+	{ "base64", b64_enc_len, b64_dec_len, b64_encode, b64_decode},
+	{ NULL, NULL, NULL, NULL, NULL}
+};
+
+
+static pg_coding *
+pg_find_coding(pg_coding *res, char *name)
+{
+	pg_coding *p;
+	for (p = encoding_list; p->name; p++) {
+		if (!strcasecmp(p->name, name))
+			return p;
+	}
+	return NULL;
+}
+