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package delta_test
import (
"bytes"
"errors"
"math"
"testing"
"lindenii.org/go/furgit/internal/format/packfile/delta"
)
func TestParseHeaderSizesRoundTrip(t *testing.T) {
t.Parallel()
cases := []struct {
name string
baseSize uint64
resultSize uint64
}{
{name: "zero", baseSize: 0, resultSize: 0},
{name: "small", baseSize: 5, resultSize: 130},
{name: "boundaries", baseSize: 127, resultSize: 128},
{name: "large", baseSize: 1 << 32, resultSize: 1 << 57},
{name: "max", baseSize: math.MaxUint64, resultSize: math.MaxUint64},
}
for _, tc := range cases {
t.Run(tc.name, func(t *testing.T) {
t.Parallel()
data := delta.AppendHeaderSizes(nil, tc.baseSize, tc.resultSize)
wantConsumed := len(data)
data = append(data, 0xde, 0xad)
baseSize, resultSize, consumed, err := delta.ParseHeaderSizes(data)
if err != nil {
t.Fatalf("ParseHeaderSizes: %v", err)
}
if baseSize != tc.baseSize {
t.Fatalf("ParseHeaderSizes base size = %d, want %d", baseSize, tc.baseSize)
}
if resultSize != tc.resultSize {
t.Fatalf("ParseHeaderSizes result size = %d, want %d", resultSize, tc.resultSize)
}
if consumed != wantConsumed {
t.Fatalf("ParseHeaderSizes consumed = %d, want %d", consumed, wantConsumed)
}
})
}
}
func TestParseHeaderSizesMalformed(t *testing.T) {
t.Parallel()
cases := []struct {
name string
data []byte
}{
{name: "empty", data: []byte{}},
{name: "truncated first varint", data: []byte{0x80}},
{name: "missing second varint", data: []byte{0x05}},
{name: "truncated second varint", data: []byte{0x05, 0x80}},
{
name: "overflow",
data: append(bytes.Repeat([]byte{0xff}, 9), 0x7f),
},
{
name: "overlong",
data: append(bytes.Repeat([]byte{0x80}, 10), 0x00),
},
}
for _, tc := range cases {
t.Run(tc.name, func(t *testing.T) {
t.Parallel()
_, _, _, err := delta.ParseHeaderSizes(tc.data)
if !errors.Is(err, delta.ErrMalformedDelta) {
t.Fatalf("ParseHeaderSizes error = %v, want ErrMalformedDelta", err)
}
})
}
}
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