1 files changed, 85 insertions, 0 deletions
diff --git a/src/lib/hex-binary.c b/src/lib/hex-binary.c
new file mode 100644
index 0000000..a6d7849
--- /dev/null
+++ b/src/lib/hex-binary.c
@@ -0,0 +1,85 @@
+/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "buffer.h"
+#include "hex-binary.h"
+
+static void
+binary_to_hex_case(unsigned char *dest, const unsigned char *data,
+		   size_t size, bool ucase)
+{
+	unsigned char *p;
+	char base_char;
+	size_t i;
+	int value;
+
+	/* @UNSAFE */
+	base_char = ucase ? 'A' : 'a';
+
+	p = dest;
+	for (i = 0; i < size; i++) {
+		value = data[i] >> 4;
+		*p++ = value < 10 ? value + '0' : value - 10 + base_char;
+
+		value = data[i] & 0x0f;
+		*p++ = value < 10 ? value + '0' : value - 10 + base_char;
+	}
+}
+
+const char *binary_to_hex(const unsigned char *data, size_t size)
+{
+	unsigned char *dest = t_malloc_no0(MALLOC_MULTIPLY(size, 2) + 1);
+
+	binary_to_hex_case(dest, data, size, FALSE);
+	dest[size*2] = '\0';
+	return (char *)dest;
+}
+
+const char *binary_to_hex_ucase(const unsigned char *data, size_t size)
+{
+	unsigned char *dest = t_malloc_no0(MALLOC_MULTIPLY(size, 2) + 1);
+
+	binary_to_hex_case(dest, data, size, TRUE);
+	dest[size*2] = '\0';
+	return (char *)dest;
+}
+
+void binary_to_hex_append(string_t *dest, const unsigned char *data,
+			  size_t size)
+{
+	unsigned char *buf;
+
+	buf = buffer_append_space_unsafe(dest, size * 2);
+	binary_to_hex_case(buf, data, size, FALSE);
+}
+
+int hex_to_binary(const char *data, buffer_t *dest)
+{
+	int value;
+
+	while (*data != '\0') {
+		if (*data >= '0' && *data <= '9')
+			value = (*data - '0') << 4;
+		else if (*data >= 'a' && *data <= 'f')
+			value = (*data - 'a' + 10) << 4;
+		else if (*data >= 'A' && *data <= 'F')
+			value = (*data - 'A' + 10) << 4;
+		else
+			return -1;
+
+		data++;
+		if (*data >= '0' && *data <= '9')
+			value |= *data - '0';
+		else if (*data >= 'a' && *data <= 'f')
+			value |= *data - 'a' + 10;
+		else if (*data >= 'A' && *data <= 'F')
+			value |= *data - 'A' + 10;
+		else
+			return -1;
+
+		buffer_append_c(dest, value);
+		data++;
+	}
+
+	return 0;
+}