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Merge pull request #2 from LinuxSuRen/support-resend
Support order insensitive of the sender or receiver
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,130 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "net" | ||
| "os" | ||
| "path" | ||
| "runtime" | ||
| "strconv" | ||
| "strings" | ||
| ) | ||
|
|
||
| type dataHeader struct { | ||
| length int // 20 bit | ||
| filename string // 100 bit | ||
| chrunk int // 10 bit | ||
| count int // 10 bit | ||
| index int // 10 bit | ||
| data []byte | ||
|
|
||
| remote *net.UDPAddr | ||
| } | ||
|
|
||
| func readHeader(conn *net.UDPConn) (header dataHeader, err error) { | ||
| message := make([]byte, 65507) | ||
| var rlen int | ||
| rlen, header.remote, err = conn.ReadFromUDP(message[:]) | ||
| if err == nil { | ||
| if rlen <= 150 { | ||
| err = fmt.Errorf("invalid header format") | ||
| return | ||
| } | ||
|
|
||
| if header.length, err = strconv.Atoi(strings.TrimSpace(string(message[:20]))); err != nil { | ||
| return | ||
| } | ||
| header.filename = strings.TrimSpace(string(message[20:120])) | ||
| if header.chrunk, err = strconv.Atoi(strings.TrimSpace(string(message[120:130]))); err != nil { | ||
| return | ||
| } | ||
| if header.count, err = strconv.Atoi(strings.TrimSpace(string(message[130:140]))); err != nil { | ||
| return | ||
| } | ||
| if header.index, err = strconv.Atoi(strings.TrimSpace(string(message[140:150]))); err != nil { | ||
| return | ||
| } | ||
|
|
||
| header.data = message[150:rlen] | ||
| } | ||
| return | ||
| } | ||
|
|
||
| type headerBuilder struct { | ||
| file string | ||
|
|
||
| filename string | ||
| fileSize int64 | ||
| chunk int | ||
| bufferCount int | ||
| } | ||
|
|
||
| // NewHeaderBuilder creates an instance of the headerBuilder | ||
| func NewHeaderBuilder(file string) *headerBuilder { | ||
| return &headerBuilder{ | ||
| file: file, | ||
| } | ||
| } | ||
|
|
||
| func (h *headerBuilder) Build() (err error) { | ||
| var fi os.FileInfo | ||
| if fi, err = os.Stat(h.file); err != nil { | ||
| return | ||
| } | ||
|
|
||
| h.fileSize = fi.Size() | ||
| h.filename = path.Base(fi.Name()) | ||
|
|
||
| switch runtime.GOOS { | ||
| case "darwin": | ||
| h.chunk = 500 // default value on darwin is 9216 | ||
| default: | ||
| h.chunk = 60000 | ||
| } | ||
|
|
||
| var ( | ||
| index int | ||
| i, j int64 | ||
| ) | ||
| for i = 0; i < h.fileSize; index++ { | ||
| j = i + int64(h.chunk) | ||
| if j > h.fileSize { | ||
| j = h.fileSize | ||
| } | ||
| h.bufferCount = h.bufferCount + 1 | ||
| i = j | ||
| } | ||
| return | ||
| } | ||
|
|
||
| // CreateHeader creates the header with index | ||
| func (h *headerBuilder) CreateHeader(index int, data []byte) []byte { | ||
| // length,filename,count,index | ||
| header := fmt.Sprintf("%s%s%s%s%s", | ||
| fillContainerWithNumber(int(h.GetFileSize()), 20), | ||
| fillContainer(h.GetFilename(), 100), | ||
| fillContainerWithNumber(h.GetChunk(), 10), | ||
| fillContainerWithNumber(h.GetBufferCount(), 10), | ||
| fillContainerWithNumber(index, 10)) | ||
| return append([]byte(header), data...) | ||
| } | ||
|
|
||
| // GetChunk returns the chunk size | ||
| func (h *headerBuilder) GetChunk() int { | ||
| return h.chunk | ||
| } | ||
|
|
||
| // GetBufferCount returns the buffer count | ||
| func (h *headerBuilder) GetBufferCount() int { | ||
| return h.bufferCount | ||
| } | ||
|
|
||
| // GetFileSize returns the file size | ||
| func (h *headerBuilder) GetFileSize() int64 { | ||
| return h.fileSize | ||
| } | ||
|
|
||
| // GetFilename returns the file name | ||
| func (h *headerBuilder) GetFilename() string { | ||
| return h.filename | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,23 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "github.com/stretchr/testify/assert" | ||
| "os" | ||
| "path" | ||
| "testing" | ||
| ) | ||
|
|
||
| func TestHeaderBuilder(t *testing.T) { | ||
| file := path.Join(os.TempDir(), "fake") | ||
| err := os.WriteFile(file, []byte("hello"), 0600) | ||
| assert.Nil(t, err) | ||
| defer func() { | ||
| _ = os.RemoveAll(file) | ||
| }() | ||
|
|
||
| builder := NewHeaderBuilder(file) | ||
| assert.Nil(t, builder.Build()) | ||
|
|
||
| data := builder.CreateHeader(1, []byte("hello")) | ||
| assert.Equal(t, []byte(" 5 fake 60000 1 1hello"), data) | ||
| } |
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