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package gitdiff
import (
"bytes"
"testing"
)
func TestBase85Decode(t *testing.T) {
tests := map[string]struct {
Input string
Output []byte
Err bool
}{
"twoBytes": {
Input: "%KiWV",
Output: []byte{0xCA, 0xFE},
},
"fourBytes": {
Input: "007GV",
Output: []byte{0x0, 0x0, 0xCA, 0xFE},
},
"sixBytes": {
Input: "007GV%KiWV",
Output: []byte{0x0, 0x0, 0xCA, 0xFE, 0xCA, 0xFE},
},
"invalidCharacter": {
Input: "00'GV",
Err: true,
},
"underpaddedSequence": {
Input: "007G",
Err: true,
},
"dataUnderrun": {
Input: "007GV",
Output: make([]byte, 8),
Err: true,
},
}
for name, test := range tests {
t.Run(name, func(t *testing.T) {
dst := make([]byte, len(test.Output))
err := base85Decode(dst, []byte(test.Input))
if test.Err {
if err == nil {
t.Fatalf("expected error decoding base85 data, but got nil")
}
return
}
if err != nil {
t.Fatalf("unexpected error decoding base85 data: %v", err)
}
for i, b := range test.Output {
if dst[i] != b {
t.Errorf("incorrect byte at index %d: expected 0x%X, actual 0x%X", i, b, dst[i])
}
}
})
}
}
func TestBase85Encode(t *testing.T) {
tests := map[string]struct {
Input []byte
Output string
}{
"zeroBytes": {
Input: []byte{},
Output: "",
},
"twoBytes": {
Input: []byte{0xCA, 0xFE},
Output: "%KiWV",
},
"fourBytes": {
Input: []byte{0x0, 0x0, 0xCA, 0xFE},
Output: "007GV",
},
"sixBytes": {
Input: []byte{0x0, 0x0, 0xCA, 0xFE, 0xCA, 0xFE},
Output: "007GV%KiWV",
},
}
for name, test := range tests {
t.Run(name, func(t *testing.T) {
dst := make([]byte, len(test.Output))
base85Encode(dst, test.Input)
for i, b := range test.Output {
if dst[i] != byte(b) {
t.Errorf("incorrect character at index %d: expected '%c', actual '%c'", i, b, dst[i])
}
}
})
}
}
func FuzzBase85Roundtrip(f *testing.F) {
f.Add([]byte{0x2b, 0x0d})
f.Add([]byte{0xbc, 0xb4, 0x3f})
f.Add([]byte{0xfa, 0x62, 0x05, 0x83, 0x24, 0x39, 0xd5, 0x25})
f.Add([]byte{0x31, 0x59, 0x02, 0xa0, 0x61, 0x12, 0xd9, 0x43, 0xb8, 0x23, 0x1a, 0xb4, 0x02, 0xae, 0xfa, 0xcc, 0x22, 0xad, 0x41, 0xb9, 0xb8})
f.Fuzz(func(t *testing.T, in []byte) {
n := len(in)
dst := make([]byte, base85Len(n))
out := make([]byte, n)
base85Encode(dst, in)
if err := base85Decode(out, dst); err != nil {
t.Fatalf("unexpected error decoding base85 data: %v", err)
}
if !bytes.Equal(in, out) {
t.Errorf("decoded data differed from input data:\n input: %x\n output: %x\nencoding: %s\n", in, out, string(dst))
}
})
}
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