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package hotline
import (
"encoding/binary"
"errors"
"io"
"slices"
)
// List of Hotline protocol field types taken from the official 1.9 protocol document
var (
FieldError = [2]byte{0x00, 0x64} // 100
FieldData = [2]byte{0x00, 0x65} // 101
FieldUserName = [2]byte{0x00, 0x66} // 102
FieldUserID = [2]byte{0x00, 0x67} // 103
FieldUserIconID = [2]byte{0x00, 0x68} // 104
FieldUserLogin = [2]byte{0x00, 0x69} // 105
FieldUserPassword = [2]byte{0x00, 0x6A} // 106
FieldRefNum = [2]byte{0x00, 0x6B} // 107
FieldTransferSize = [2]byte{0x00, 0x6C} // 108
FieldChatOptions = [2]byte{0x00, 0x6D} // 109
FieldUserAccess = [2]byte{0x00, 0x6E} // 110
FieldUserFlags = [2]byte{0x00, 0x70} // 112
FieldOptions = [2]byte{0x00, 0x71} // 113
FieldChatID = [2]byte{0x00, 0x72} // 114
FieldChatSubject = [2]byte{0x00, 0x73} // 115
FieldWaitingCount = [2]byte{0x00, 0x74} // 116
FieldBannerType = [2]byte{0x00, 0x98} // 152
FieldNoServerAgreement = [2]byte{0x00, 0x98} // 152
FieldVersion = [2]byte{0x00, 0xA0} // 160
FieldCommunityBannerID = [2]byte{0x00, 0xA1} // 161
FieldServerName = [2]byte{0x00, 0xA2} // 162
FieldFileNameWithInfo = [2]byte{0x00, 0xC8} // 200
FieldFileName = [2]byte{0x00, 0xC9} // 201
FieldFilePath = [2]byte{0x00, 0xCA} // 202
FieldFileResumeData = [2]byte{0x00, 0xCB} // 203
FieldFileTransferOptions = [2]byte{0x00, 0xCC} // 204
FieldFileTypeString = [2]byte{0x00, 0xCD} // 205
FieldFileCreatorString = [2]byte{0x00, 0xCE} // 206
FieldFileSize = [2]byte{0x00, 0xCF} // 207
FieldFileCreateDate = [2]byte{0x00, 0xD0} // 208
FieldFileModifyDate = [2]byte{0x00, 0xD1} // 209
FieldFileComment = [2]byte{0x00, 0xD2} // 210
FieldFileNewName = [2]byte{0x00, 0xD3} // 211
FieldFileNewPath = [2]byte{0x00, 0xD4} // 212
FieldFileType = [2]byte{0x00, 0xD5} // 213
FieldQuotingMsg = [2]byte{0x00, 0xD6} // 214
FieldAutomaticResponse = [2]byte{0x00, 0xD7} // 215
FieldFolderItemCount = [2]byte{0x00, 0xDC} // 220
FieldUsernameWithInfo = [2]byte{0x01, 0x2C} // 300
FieldNewsArtListData = [2]byte{0x01, 0x41} // 321
FieldNewsCatName = [2]byte{0x01, 0x42} // 322
FieldNewsCatListData15 = [2]byte{0x01, 0x43} // 323
FieldNewsPath = [2]byte{0x01, 0x45} // 325
FieldNewsArtID = [2]byte{0x01, 0x46} // 326
FieldNewsArtDataFlav = [2]byte{0x01, 0x47} // 327
FieldNewsArtTitle = [2]byte{0x01, 0x48} // 328
FieldNewsArtPoster = [2]byte{0x01, 0x49} // 329
FieldNewsArtDate = [2]byte{0x01, 0x4A} // 330
FieldNewsArtPrevArt = [2]byte{0x01, 0x4B} // 331
FieldNewsArtNextArt = [2]byte{0x01, 0x4C} // 332
FieldNewsArtData = [2]byte{0x01, 0x4D} // 333
FieldNewsArtParentArt = [2]byte{0x01, 0x4F} // 335
FieldNewsArt1stChildArt = [2]byte{0x01, 0x50} // 336
// These fields are documented, but seemingly unused.
// FieldUserAlias = [2]byte{0x00, 0x6F} // 111
// FieldNewsArtFlags = [2]byte{0x01, 0x4E} // 334
// FieldNewsArtRecurseDel = [2]byte{0x01, 0x51} // 337
)
type Field struct {
ID [2]byte // Type of field
FieldSize [2]byte // Size of the data part
Data []byte // Actual field content
readOffset int // Internal offset to track read progress
}
func NewField(id [2]byte, data []byte) Field {
f := Field{
ID: id,
Data: make([]byte, len(data)),
}
// Copy instead of assigning to avoid data race when the field is read in another go routine.
copy(f.Data, data)
binary.BigEndian.PutUint16(f.FieldSize[:], uint16(len(data)))
return f
}
// fieldScanner implements bufio.SplitFunc for parsing byte slices into complete tokens
func fieldScanner(data []byte, _ bool) (advance int, token []byte, err error) {
if len(data) < minFieldLen {
return 0, nil, nil
}
// neededSize represents the length of bytes that are part of the field token.
neededSize := minFieldLen + int(binary.BigEndian.Uint16(data[2:4]))
if neededSize > len(data) {
return 0, nil, nil
}
return neededSize, data[0:neededSize], nil
}
// Read implements io.Reader for Field
func (f *Field) Read(p []byte) (int, error) {
buf := slices.Concat(f.ID[:], f.FieldSize[:], f.Data)
if f.readOffset >= len(buf) {
return 0, io.EOF // All bytes have been read
}
n := copy(p, buf[f.readOffset:])
f.readOffset += n
return n, nil
}
// Write implements io.Writer for Field
func (f *Field) Write(p []byte) (int, error) {
if len(p) < minFieldLen {
return 0, errors.New("input slice too short")
}
copy(f.ID[:], p[0:2])
copy(f.FieldSize[:], p[2:4])
dataSize := int(binary.BigEndian.Uint16(f.FieldSize[:]))
if len(p) < minFieldLen+dataSize {
return 0, errors.New("input slice too short for data size")
}
f.Data = make([]byte, dataSize)
copy(f.Data, p[4:4+dataSize])
return minFieldLen + dataSize, nil
}
func getField(id [2]byte, fields *[]Field) *Field {
for _, field := range *fields {
if id == field.ID {
return &field
}
}
return nil
}
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