go-catprinter/commands.go
2024-09-10 22:45:30 +02:00

213 lines
6.3 KiB
Go

package catprinter
import "fmt"
var (
cmdGetDevState = []byte{81, 120, 163, 0, 1, 0, 0, 0, 255}
cmdSetQuality200Dpi = []byte{81, 120, 164, 0, 1, 0, 50, 158, 255}
cmdGetDevInfo = []byte{81, 120, 168, 0, 1, 0, 0, 0, 255}
cmdLatticeStart = []byte{81, 120, 166, 0, 11, 0, 170, 85, 23, 56, 68, 95, 95, 95, 68, 56, 44, 161, 255}
cmdLatticeEnd = []byte{81, 120, 166, 0, 11, 0, 170, 85, 23, 0, 0, 0, 0, 0, 0, 0, 23, 17, 255}
cmdSetPaper = []byte{81, 120, 161, 0, 2, 0, 48, 0, 249, 255}
cmdPrintImg = []byte{81, 120, 190, 0, 1, 0, 0, 0, 255}
cmdPrintText = []byte{81, 120, 190, 0, 1, 0, 1, 7, 255}
cmdStartPrinting = []byte{0x51, 0x78, 0xa3, 0x00, 0x01, 0x00, 0x00, 0x00, 0xff}
cmdApplyEnergy = []byte{81, 120, 190, 0, 1, 0, 1, 7, 255}
cmdUpdateDevice = []byte{81, 120, 169, 0, 1, 0, 0, 0, 255}
cmdSlow = []byte{81, 120, 189, 0, 1, 0, 36, 252, 255}
cmdPower = []byte{81, 120, 175, 0, 2, 0, 255, 223, 196, 255}
cmdFinalSpeed = []byte{81, 120, 189, 0, 1, 0, 8, 56, 255}
checksumTable = []byte{
0, 7, 14, 9, 28, 27, 18, 21, 56, 63, 54, 49, 36, 35, 42, 45, 112, 119, 126, 121, 108, 107, 98,
101, 72, 79, 70, 65, 84, 83, 90, 93, 224, 231, 238, 233, 252, 251, 242, 245, 216, 223, 214, 209, 196, 195, 202,
205, 144, 151, 158, 153, 140, 139, 130, 133, 168, 175, 166, 161, 180, 179, 186, 189, 199, 192, 201, 206, 219, 220,
213, 210, 255, 248, 241, 246, 227, 228, 237, 234, 183, 176, 185, 190, 171, 172, 165, 162, 143, 136, 129, 134, 147,
148, 157, 154, 39, 32, 41, 46, 59, 60, 53, 50, 31, 24, 17, 22, 3, 4, 13, 10, 87, 80, 89, 94, 75, 76, 69, 66, 111,
104, 97, 102, 115, 116, 125, 122, 137, 142, 135, 128, 149, 146, 155, 156, 177, 182, 191, 184, 173, 170, 163, 164,
249, 254, 247, 240, 229, 226, 235, 236, 193, 198, 207, 200, 221, 218, 211, 212, 105, 110, 103, 96, 117, 114, 123,
124, 81, 86, 95, 88, 77, 74, 67, 68, 25, 30, 23, 16, 5, 2, 11, 12, 33, 38, 47, 40, 61, 58, 51, 52, 78, 73, 64, 71,
82, 85, 92, 91, 118, 113, 120, 127, 106, 109, 100, 99, 62, 57, 48, 55, 34, 37, 44, 43, 6, 1, 8, 15, 26, 29, 20, 19,
174, 169, 160, 167, 178, 181, 188, 187, 150, 145, 152, 159, 138, 141, 132, 131, 222, 217, 208, 215, 194, 197, 204,
203, 230, 225, 232, 239, 250, 253, 244, 243,
}
)
// checksum calculates the checksum for a given byte array.
func checksum(bArr []byte, i, i2 int) byte {
var b2 byte
for i3 := i; i3 < i+i2; i3++ {
b2 = checksumTable[(b2^bArr[i3])&0xff]
}
return b2
}
// commandFeedPaper creates a command to feed paper by a specified amount.
func commandFeedPaper(howMuch int) []byte {
bArr := []byte{
81,
120,
189,
0,
1,
0,
byte(howMuch & 0xff),
0,
255,
}
bArr[7] = checksum(bArr, 6, 1)
return bArr
}
// cmdSetEnergy sets the energy level. Max to `0xffff` By default, it seems around `0x3000` (1 / 5)
func commandSetEnergy(val int) []byte {
bArr := []byte{
81,
120,
175,
0,
2,
0,
byte((val >> 8) & 0xff),
byte(val & 0xff),
0,
255,
}
bArr[7] = checksum(bArr, 6, 2)
fmt.Println(bArr)
return bArr
}
// encodeRunLengthRepetition encodes repetitions in a run-length format.
func encodeRunLengthRepetition(n int, val byte) []byte {
var res []byte
for n > 0x7f {
res = append(res, 0x7f|byte(val<<7))
n -= 0x7f
}
if n > 0 {
res = append(res, val<<7|byte(n))
}
return res
}
// runLengthEncode performs run-length encoding on an image row.
func runLengthEncode(imgRow []byte) []byte {
var res []byte
count := 0
var lastVal byte = 255
for _, val := range imgRow {
if val == lastVal {
count++
} else {
res = append(res, encodeRunLengthRepetition(count, lastVal)...)
count = 1
}
lastVal = val
}
if count > 0 {
res = append(res, encodeRunLengthRepetition(count, lastVal)...)
}
return res
}
// byteEncode encodes an image row into a byte array.
func byteEncode(imgRow []byte) []byte {
var res []byte
for chunkStart := 0; chunkStart < len(imgRow); chunkStart += 8 {
var byteVal byte = 0
for bitIndex := 0; bitIndex < 8; bitIndex++ {
if chunkStart+bitIndex < len(imgRow) && imgRow[chunkStart+bitIndex] != 0 {
byteVal |= 1 << uint8(bitIndex)
}
}
res = append(res, byteVal)
}
return res
}
// commandPrintRow builds a print row command based on the image data.
func commandPrintRow(imgRow []byte) []byte {
// Try to use run-length compression on the image data.
encodedImg := runLengthEncode(imgRow)
// If the resulting compression takes more than PRINT_WIDTH // 8, it means
// it's not worth it. So we fall back to a simpler, fixed-length encoding.
if len(encodedImg) > printWidth/8 {
encodedImg = byteEncode(imgRow)
bArr := append([]byte{
81,
120,
162,
0,
byte(len(encodedImg) & 0xff),
0,
}, encodedImg...)
bArr = append(bArr, 0, 0xff)
bArr[len(bArr)-2] = checksum(bArr, 6, len(encodedImg))
return bArr
}
// Build the run-length encoded image command.
bArr := append([]byte{81, 120, 191, 0, byte(len(encodedImg)), 0}, encodedImg...)
bArr = append(bArr, 0, 0xff)
bArr[len(bArr)-2] = checksum(bArr, 6, len(encodedImg))
return bArr
}
// commandsPrintImg builds the commands to print an image.
func commandsPrintImg(imgS []byte) []byte {
img := chunkify(imgS, printWidth)
var data []byte
data = append(data, cmdGetDevState...)
data = append(data, cmdStartPrinting...)
data = append(data, cmdSetQuality200Dpi...)
data = append(data, cmdSlow...)
data = append(data, cmdPower...)
data = append(data, cmdApplyEnergy...)
data = append(data, cmdUpdateDevice...)
data = append(data, cmdLatticeStart...)
for _, row := range img {
data = append(data, commandPrintRow(row)...)
}
data = append(data, cmdLatticeEnd...)
data = append(data, cmdFinalSpeed...)
data = append(data, commandFeedPaper(5)...)
data = append(data, cmdSetPaper...)
data = append(data, cmdSetPaper...)
data = append(data, cmdSetPaper...)
data = append(data, cmdGetDevState...)
return data
}
func weakCommandsPrintImg(imgS []byte) []byte {
img := chunkify(imgS, printWidth)
data := append(cmdGetDevState, cmdSetQuality200Dpi...)
data = append(data, cmdLatticeStart...)
for _, row := range img {
data = append(data, commandPrintRow(row)...)
}
data = append(data, commandFeedPaper(5)...)
data = append(data, cmdSetPaper...)
data = append(data, cmdSetPaper...)
data = append(data, cmdSetPaper...)
data = append(data, cmdLatticeEnd...)
data = append(data, cmdGetDevState...)
return data
}