Adding upstream version 14.5.upstream/14.5upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 242 insertions, 0 deletions

diff --git a/src/common/base64.c b/src/common/base64.c
new file mode 100644
index 0000000..b3ade2a
--- /dev/null
+++ b/src/common/base64.c
@@ -0,0 +1,242 @@
+/*-------------------------------------------------------------------------
+ *
+ * base64.c
+ *	  Encoding and decoding routines for base64 without whitespace.
+ *
+ * Copyright (c) 2001-2021, PostgreSQL Global Development Group
+ *
+ *
+ * IDENTIFICATION
+ *	  src/common/base64.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef FRONTEND
+#include "postgres.h"
+#else
+#include "postgres_fe.h"
+#endif
+
+#include "common/base64.h"
+
+/*
+ * BASE64
+ */
+
+static const char _base64[] =
+"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+static const int8 b64lookup[128] = {
+	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
+	52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
+	-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
+	15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
+	-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
+	41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1,
+};
+
+/*
+ * pg_b64_encode
+ *
+ * Encode into base64 the given string.  Returns the length of the encoded
+ * string, and -1 in the event of an error with the result buffer zeroed
+ * for safety.
+ */
+int
+pg_b64_encode(const char *src, int len, char *dst, int dstlen)
+{
+	char	   *p;
+	const char *s,
+			   *end = src + len;
+	int			pos = 2;
+	uint32		buf = 0;
+
+	s = src;
+	p = dst;
+
+	while (s < end)
+	{
+		buf |= (unsigned char) *s << (pos << 3);
+		pos--;
+		s++;
+
+		/* write it out */
+		if (pos < 0)
+		{
+			/*
+			 * Leave if there is an overflow in the area allocated for the
+			 * encoded string.
+			 */
+			if ((p - dst + 4) > dstlen)
+				goto error;
+
+			*p++ = _base64[(buf >> 18) & 0x3f];
+			*p++ = _base64[(buf >> 12) & 0x3f];
+			*p++ = _base64[(buf >> 6) & 0x3f];
+			*p++ = _base64[buf & 0x3f];
+
+			pos = 2;
+			buf = 0;
+		}
+	}
+	if (pos != 2)
+	{
+		/*
+		 * Leave if there is an overflow in the area allocated for the encoded
+		 * string.
+		 */
+		if ((p - dst + 4) > dstlen)
+			goto error;
+
+		*p++ = _base64[(buf >> 18) & 0x3f];
+		*p++ = _base64[(buf >> 12) & 0x3f];
+		*p++ = (pos == 0) ? _base64[(buf >> 6) & 0x3f] : '=';
+		*p++ = '=';
+	}
+
+	Assert((p - dst) <= dstlen);
+	return p - dst;
+
+error:
+	memset(dst, 0, dstlen);
+	return -1;
+}
+
+/*
+ * pg_b64_decode
+ *
+ * Decode the given base64 string.  Returns the length of the decoded
+ * string on success, and -1 in the event of an error with the result
+ * buffer zeroed for safety.
+ */
+int
+pg_b64_decode(const char *src, int len, char *dst, int dstlen)
+{
+	const char *srcend = src + len,
+			   *s = src;
+	char	   *p = dst;
+	char		c;
+	int			b = 0;
+	uint32		buf = 0;
+	int			pos = 0,
+				end = 0;
+
+	while (s < srcend)
+	{
+		c = *s++;
+
+		/* Leave if a whitespace is found */
+		if (c == ' ' || c == '\t' || c == '\n' || c == '\r')
+			goto error;
+
+		if (c == '=')
+		{
+			/* end sequence */
+			if (!end)
+			{
+				if (pos == 2)
+					end = 1;
+				else if (pos == 3)
+					end = 2;
+				else
+				{
+					/*
+					 * Unexpected "=" character found while decoding base64
+					 * sequence.
+					 */
+					goto error;
+				}
+			}
+			b = 0;
+		}
+		else
+		{
+			b = -1;
+			if (c > 0 && c < 127)
+				b = b64lookup[(unsigned char) c];
+			if (b < 0)
+			{
+				/* invalid symbol found */
+				goto error;
+			}
+		}
+		/* add it to buffer */
+		buf = (buf << 6) + b;
+		pos++;
+		if (pos == 4)
+		{
+			/*
+			 * Leave if there is an overflow in the area allocated for the
+			 * decoded string.
+			 */
+			if ((p - dst + 1) > dstlen)
+				goto error;
+			*p++ = (buf >> 16) & 255;
+
+			if (end == 0 || end > 1)
+			{
+				/* overflow check */
+				if ((p - dst + 1) > dstlen)
+					goto error;
+				*p++ = (buf >> 8) & 255;
+			}
+			if (end == 0 || end > 2)
+			{
+				/* overflow check */
+				if ((p - dst + 1) > dstlen)
+					goto error;
+				*p++ = buf & 255;
+			}
+			buf = 0;
+			pos = 0;
+		}
+	}
+
+	if (pos != 0)
+	{
+		/*
+		 * base64 end sequence is invalid.  Input data is missing padding, is
+		 * truncated or is otherwise corrupted.
+		 */
+		goto error;
+	}
+
+	Assert((p - dst) <= dstlen);
+	return p - dst;
+
+error:
+	memset(dst, 0, dstlen);
+	return -1;
+}
+
+/*
+ * pg_b64_enc_len
+ *
+ * Returns to caller the length of the string if it were encoded with
+ * base64 based on the length provided by caller.  This is useful to
+ * estimate how large a buffer allocation needs to be done before doing
+ * the actual encoding.
+ */
+int
+pg_b64_enc_len(int srclen)
+{
+	/* 3 bytes will be converted to 4 */
+	return (srclen + 2) * 4 / 3;
+}
+
+/*
+ * pg_b64_dec_len
+ *
+ * Returns to caller the length of the string if it were to be decoded
+ * with base64, based on the length given by caller.  This is useful to
+ * estimate how large a buffer allocation needs to be done before doing
+ * the actual decoding.
+ */
+int
+pg_b64_dec_len(int srclen)
+{
+	return (srclen * 3) >> 2;
+}