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package zbase32_test
import (
"bytes"
"testing"
"github.com/tv42/zbase32"
)
type bitTestCase struct {
bits int
decoded []byte
encoded string
}
var bitTests = []bitTestCase{
// Test cases from the spec
{0, []byte{}, ""},
{1, []byte{0}, "y"},
{1, []byte{128}, "o"},
{2, []byte{64}, "e"},
{2, []byte{192}, "a"},
{10, []byte{0, 0}, "yy"},
{10, []byte{128, 128}, "on"},
{20, []byte{139, 136, 128}, "tqre"},
{24, []byte{240, 191, 199}, "6n9hq"},
{24, []byte{212, 122, 4}, "4t7ye"},
// Note: this test varies from what's in the spec by one character!
{30, []byte{245, 87, 189, 12}, "6im54d"},
// Edge cases we stumbled on, that are not covered above.
{8, []byte{0xff}, "9h"},
{11, []byte{0xff, 0xE0}, "99o"},
{40, []byte{0xff, 0xff, 0xff, 0xff, 0xff}, "99999999"},
{48, []byte{0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, "999999999h"},
{192, []byte{
0xc0, 0x73, 0x62, 0x4a, 0xaf, 0x39, 0x78, 0x51,
0x4e, 0xf8, 0x44, 0x3b, 0xb2, 0xa8, 0x59, 0xc7,
0x5f, 0xc3, 0xcc, 0x6a, 0xf2, 0x6d, 0x5a, 0xaa,
}, "ab3sr1ix8fhfnuzaeo75fkn3a7xh8udk6jsiiko"},
// Used in the docs.
{20, []byte{0x10, 0x11, 0x10}, "nyet"},
{24, []byte{0x10, 0x11, 0x10}, "nyety"},
}
type byteTestCase struct {
decoded []byte
encoded string
}
var byteTests = []byteTestCase{
// Byte-aligned test cases from the spec
{[]byte{240, 191, 199}, "6n9hq"},
{[]byte{212, 122, 4}, "4t7ye"},
// Edge cases we stumbled on, that are not covered above.
{[]byte{0xff}, "9h"},
{[]byte{0xb5}, "sw"},
{[]byte{0x34, 0x5a}, "gtpy"},
{[]byte{0xff, 0xff, 0xff, 0xff, 0xff}, "99999999"},
{[]byte{0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, "999999999h"},
{[]byte{
0xc0, 0x73, 0x62, 0x4a, 0xaf, 0x39, 0x78, 0x51,
0x4e, 0xf8, 0x44, 0x3b, 0xb2, 0xa8, 0x59, 0xc7,
0x5f, 0xc3, 0xcc, 0x6a, 0xf2, 0x6d, 0x5a, 0xaa,
}, "ab3sr1ix8fhfnuzaeo75fkn3a7xh8udk6jsiiko"},
}
func TestEncodeBits(t *testing.T) {
for _, tc := range bitTests {
dst := make([]byte, zbase32.EncodedLen(len(tc.decoded)))
n := zbase32.EncodeBits(dst, tc.decoded, tc.bits)
dst = dst[:n]
if g, e := string(dst), tc.encoded; g != e {
t.Errorf("EncodeBits %d bits of %x wrong result: %q != %q", tc.bits, tc.decoded, g, e)
continue
}
}
}
func TestEncodeBitsString(t *testing.T) {
for _, tc := range bitTests {
s := zbase32.EncodeBitsToString(tc.decoded, tc.bits)
if g, e := s, tc.encoded; g != e {
t.Errorf("EncodeBitsToString %d bits of %x wrong result: %q != %q", tc.bits, tc.decoded, g, e)
continue
}
}
}
func TestEncodeBytes(t *testing.T) {
for _, tc := range byteTests {
dst := make([]byte, zbase32.EncodedLen(len(tc.decoded)))
n := zbase32.Encode(dst, tc.decoded)
dst = dst[:n]
if g, e := string(dst), tc.encoded; g != e {
t.Errorf("Encode %x wrong result: %q != %q", tc.decoded, g, e)
continue
}
}
}
func TestEncodeBitsMasksExcess(t *testing.T) {
for _, tc := range []bitTestCase{
{0, []byte{255, 255}, ""},
{1, []byte{255, 255}, "o"},
{2, []byte{255, 255}, "a"},
{3, []byte{255, 255}, "h"},
{4, []byte{255, 255}, "6"},
{5, []byte{255, 255}, "9"},
{6, []byte{255, 255}, "9o"},
{7, []byte{255, 255}, "9a"},
{8, []byte{255, 255}, "9h"},
{9, []byte{255, 255}, "96"},
{10, []byte{255, 255}, "99"},
{11, []byte{255, 255}, "99o"},
{12, []byte{255, 255}, "99a"},
{13, []byte{255, 255}, "99h"},
{14, []byte{255, 255}, "996"},
{15, []byte{255, 255}, "999"},
{16, []byte{255, 255}, "999o"},
} {
dst := make([]byte, zbase32.EncodedLen(len(tc.decoded)))
n := zbase32.EncodeBits(dst, tc.decoded, tc.bits)
dst = dst[:n]
if g, e := string(dst), tc.encoded; g != e {
t.Errorf("EncodeBits %d bits of %x wrong result: %q != %q", tc.bits, tc.decoded, g, e)
}
}
}
func TestDecodeBits(t *testing.T) {
for _, tc := range bitTests {
dst := make([]byte, zbase32.DecodedLen(len(tc.encoded)))
n, err := zbase32.DecodeBits(dst, []byte(tc.encoded), tc.bits)
dst = dst[:n]
if err != nil {
t.Errorf("DecodeBits %d bits from %q: error: %v", tc.bits, tc.encoded, err)
continue
}
if g, e := dst, tc.decoded; !bytes.Equal(g, e) {
t.Errorf("DecodeBits %d bits from %q, %x != %x", tc.bits, tc.encoded, g, e)
}
}
}
func TestDecodeBitsString(t *testing.T) {
for _, tc := range bitTests {
dec, err := zbase32.DecodeBitsString(tc.encoded, tc.bits)
if err != nil {
t.Errorf("DecodeBits %d bits from %q: error: %v", tc.bits, tc.encoded, err)
continue
}
if g, e := dec, tc.decoded; !bytes.Equal(g, e) {
t.Errorf("DecodeBits %d bits from %q, %x != %x", tc.bits, tc.encoded, g, e)
}
}
}
func TestDecodeBytes(t *testing.T) {
for _, tc := range byteTests {
dst := make([]byte, zbase32.DecodedLen(len(tc.encoded)))
n, err := zbase32.Decode(dst, []byte(tc.encoded))
dst = dst[:n]
if err != nil {
t.Errorf("Decode %q: error: %v", tc.encoded, err)
continue
}
if g, e := dst, tc.decoded; !bytes.Equal(g, e) {
t.Errorf("Decode %q, %x != %x", tc.encoded, g, e)
}
}
}
func TestDecodeBad(t *testing.T) {
input := `foo!bar`
_, err := zbase32.DecodeString(input)
switch err := err.(type) {
case nil:
t.Fatalf("expected error from bad decode")
case zbase32.CorruptInputError:
if g, e := err.Error(), `illegal z-base-32 data at input byte 3`; g != e {
t.Fatalf("wrong error: %q != %q", g, e)
}
default:
t.Fatalf("wrong error from bad decode: %T: %v", err, err)
}
}
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