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seeker instead of reader to preserve the original state of reader after filetype checking #148

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seeker instead of reader to preserve the original state of reader after filetype checking #148

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4 changes: 3 additions & 1 deletion match.go
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Original file line number Diff line number Diff line change
Expand Up @@ -52,14 +52,16 @@ func MatchFile(filepath string) (types.Type, error) {
}

// MatchReader is convenient wrapper to Match() any Reader
func MatchReader(reader io.Reader) (types.Type, error) {
func MatchReader(reader io.ReadSeeker) (types.Type, error) {
buffer := make([]byte, 8192) // 8K makes msooxml tests happy and allows for expanded custom file checks

_, err := reader.Read(buffer)
if err != nil && err != io.EOF {
return types.Unknown, err
}

reader.Seek(0, 0)

return Match(buffer)
}

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8 changes: 4 additions & 4 deletions match_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -71,12 +71,12 @@ func TestMatchFile(t *testing.T) {

func TestMatchReader(t *testing.T) {
cases := []struct {
buf io.Reader
buf io.ReadSeeker
ext string
}{
{bytes.NewBuffer([]byte{0xFF, 0xD8, 0xFF}), "jpg"},
{bytes.NewBuffer([]byte{0xFF, 0xD8, 0x00}), "unknown"},
{bytes.NewBuffer([]byte{0x89, 0x50, 0x4E, 0x47}), "png"},
{bytes.NewReader([]byte{0xFF, 0xD8, 0xFF}), "jpg"},
{bytes.NewReader([]byte{0xFF, 0xD8, 0x00}), "unknown"},
{bytes.NewReader([]byte{0x89, 0x50, 0x4E, 0x47}), "png"},
}

for _, test := range cases {
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