From 458b5af00320ab9c0e4a0845b85e03589c28a4a6 Mon Sep 17 00:00:00 2001
From: Erik Ekman <yarrick@kryo.se>
Date: Thu, 11 Dec 2008 19:26:11 +0000
Subject: [PATCH] Added simple 5bits to 8 and reverse encoder, with test

---
 src/base32.c   | 21 +++++++++++++++++++++
 src/base32.h   |  2 ++
 tests/base32.c | 13 +++++++++++++
 3 files changed, 36 insertions(+)

diff --git a/src/base32.c b/src/base32.c
index 9040c88..12885a7 100644
--- a/src/base32.c
+++ b/src/base32.c
@@ -70,6 +70,27 @@ base32_blksize_enc()
 	return BLKSIZE_ENC;
 }
 
+int
+b32_5to8(int in)
+{
+	return cb32[in & 31];
+}
+
+int
+b32_8to5(int in)
+{
+	int i;
+	int c;
+	if (!reverse_init) {
+		for (i = 0; i < 32; i++) {
+			c = cb32[i];
+			rev32[(int) c] = i;
+		}
+		reverse_init = 1;
+	}
+	return rev32[in];
+}
+
 static int 
 base32_encode(char *buf, size_t *buflen, const void *data, size_t size)
 {
diff --git a/src/base32.h b/src/base32.h
index 3eb764d..114b9ae 100644
--- a/src/base32.h
+++ b/src/base32.h
@@ -19,4 +19,6 @@
 
 struct encoder *get_base32_encoder(void);
 
+int b32_5to8(int);
+int b32_8to5(int);
 #endif
diff --git a/tests/base32.c b/tests/base32.c
index 723490b..fffaea3 100644
--- a/tests/base32.c
+++ b/tests/base32.c
@@ -77,6 +77,18 @@ START_TEST(test_base32_decode)
 }
 END_TEST
 
+START_TEST(test_base32_5to8_8to5)
+{
+	int i;
+	int c;
+
+	for (i = 0; i < 32; i++) {
+		c = b32_5to8(i);	
+		fail_unless(b32_8to5(c) == i);
+	}
+}
+END_TEST
+
 TCase *
 test_base32_create_tests()
 {
@@ -85,6 +97,7 @@ test_base32_create_tests()
 	tc = tcase_create("Base32");
 	tcase_add_test(tc, test_base32_encode);
 	tcase_add_test(tc, test_base32_decode);
+	tcase_add_test(tc, test_base32_5to8_8to5);
 
 	return tc;
 }