Remove null terminator from short message

AApparently the message does not use it

go.mod

@@ -2,4 +2,7 @@ module smpptester
 
 go 1.22.4
 
-require github.com/yuin/gopher-lua v1.1.1
+require (
+	github.com/warthog618/sms v0.3.0
+	github.com/yuin/gopher-lua v1.1.1
+)

go.sum

@@ -1,2 +1,16 @@
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
+github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e/go.mod h1:zD1mROLANZcx1PVRCS0qkT7pwLkGfwJo4zjcN/Tysno=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
+github.com/warthog618/sms v0.3.0 h1:LYAb5ngmu2qjNExgji3B7xi2tIZ9+DsuE9pC5xs4wwc=
+github.com/warthog618/sms v0.3.0/go.mod h1:+bYZGeBxu003sxD5xhzsrIPBAjPBzTABsRTwSpd7ld4=
 github.com/yuin/gopher-lua v1.1.1 h1:kYKnWBjvbNP4XLT3+bPEwAXJx262OhaHDWDVOPjL46M=
 github.com/yuin/gopher-lua v1.1.1/go.mod h1:GBR0iDaNXjAgGg9zfCvksxSRnQx76gclCIb7kdAd1Pw=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

pdu/global.go

@@ -1,3 +1,5 @@
 package pdu
 
 var ByteBufferPool = NewBufferPoolManager()
+const NULL = byte(0x00)
+var NULL_ARR = []byte{NULL}

pdu/pdu.go

@@ -12,6 +12,7 @@ type (
 		Decode(*bytes.Buffer) error
 		// Size in bytes
 		Size() int
+		UpdateSize()
 	}
 
 	PDU_HEADER struct {
@@ -80,3 +81,6 @@ func (p *PDU_HEADER) Decode(buf *bytes.Buffer) error {
 func (p *PDU_HEADER) Size() int {
 	return 16
 }
+func (p *PDU_HEADER) UpdateSize() {
+	p.command_length = uint32(p.Size())
+}

pdu/submit.go

@@ -5,6 +5,8 @@ import (
 	"encoding/ascii85"
 	"encoding/binary"
 	"fmt"
+
+	"github.com/warthog618/sms/encoding/gsm7"
 )
 
 type (
@@ -69,32 +71,40 @@ func (p *SUBMIT_SM) Encode(buf *bytes.Buffer) error {
 	if buf == nil {
 		return fmt.Errorf("cannot encode into nil buffer")
 	}
+	asciiEncoder := ascii85.NewEncoder(buf)
+	// TODO: Implement encodings bsed on p.data_coding
+	messageEncoder := gsm7.NewEncoder()
+
 	p.header.Encode(buf)
-	n := ascii85.Encode(buf.Bytes(), []byte(p.service_type))
-	buf.Truncate(n)
+	asciiEncoder.Write([]byte(p.service_type))
+	buf.Write(NULL_ARR)
+	asciiEncoder.Write([]byte(p.service_type))
+	buf.Write(NULL_ARR)
 	binary.Write(buf, binary.BigEndian, p.source_addr_ton)
 	binary.Write(buf, binary.BigEndian, p.source_addr_npi)
-	n = ascii85.Encode(buf.Bytes(), []byte(p.source_addr))
-	buf.Truncate(n)
+	asciiEncoder.Write([]byte(p.source_addr))
+	buf.Write(NULL_ARR)
 	binary.Write(buf, binary.BigEndian, p.dest_addr_ton)
 	binary.Write(buf, binary.BigEndian, p.dest_addr_npi)
-	n = ascii85.Encode(buf.Bytes(), []byte(p.destination_addr))
-	buf.Truncate(n)
+	asciiEncoder.Write([]byte(p.destination_addr))
+	buf.Write(NULL_ARR)
 	binary.Write(buf, binary.BigEndian, p.esm_class)
 	binary.Write(buf, binary.BigEndian, p.protocol_id)
 	binary.Write(buf, binary.BigEndian, p.priority_flag)
-	n = ascii85.Encode(buf.Bytes(), []byte(p.schedule_delivery_time))
-	buf.Truncate(n)
-	n = ascii85.Encode(buf.Bytes(), []byte(p.validity_period))
-	buf.Truncate(n)
+	asciiEncoder.Write([]byte(p.schedule_delivery_time))
+	buf.Write(NULL_ARR)
+	asciiEncoder.Write([]byte(p.validity_period))
+	buf.Write(NULL_ARR)
 	binary.Write(buf, binary.BigEndian, p.registered_delivery)
 	binary.Write(buf, binary.BigEndian, p.replace_if_present)
 	binary.Write(buf, binary.BigEndian, p.data_coding)
 	binary.Write(buf, binary.BigEndian, p.sm_default_msg_id)
 	binary.Write(buf, binary.BigEndian, p.sm_length)
-	// TODO: Implement encodings bsed on p.data_coding
-	n = ascii85.Encode(buf.Bytes(), []byte(p.short_message))
-	buf.Truncate(n)
+	encodedMsg, err := messageEncoder.Encode([]byte(p.short_message))
+	if err != nil {
+		return err
+	}
+	buf.Write(encodedMsg)
 	return nil
 }
 func (p *SUBMIT_SM) Decode(buf *bytes.Buffer) error {
@@ -106,23 +116,37 @@ func (p *SUBMIT_SM) Decode(buf *bytes.Buffer) error {
 func (p *SUBMIT_SM) Size() int {
 	var size int
 	size += p.header.Size()
-	size += len(p.service_type) * 1
+	size += 1 + len(p.service_type)
 	size += 1 // source_addr_ton
 	size += 1 // source_addr_npi
-	size += len(p.source_addr) * 1
+	size += 1 + len(p.source_addr)
 	size += 1 // dest_addr_ton
 	size += 1 // dest_addr_npi
-	size += len(p.destination_addr) * 1
+	size += 1 + len(p.destination_addr)
 	size += 1 // esm_class
 	size += 1 // protocol_id
 	size += 1 // priority_flag
-	size += len(p.schedule_delivery_time) * 1
-	size += len(p.validity_period) * 1
+	size += 1 + len(p.schedule_delivery_time)
+	size += 1 + len(p.validity_period)
 	size += 1 // registered_delivery
 	size += 1 // replace_if_present
 	size += 1 // data_coding
 	size += 1 // sm_default_msg_id
 	size += 1 // sm_length
-	size += len(p.short_message) * 1
+	// TODO: Handle encoding based on p.data_coding
+	switch p.data_coding {
+	case 0b00000000: // GSM7
+		size += (len(p.short_message)*7 + 8 - 1) / 8
+	case 0b00000001: // ASCII
+		size += len(p.short_message)
+	case 0b00000011: // LATIN1
+		size += len(p.short_message)
+	case 0b00001000: // UCS2
+		size += len(p.short_message) * 2
+	}
 	return size
 }
+func (p *SUBMIT_SM) UpdateSize() {
+	p.header.command_length = uint32(p.Size())
+	p.sm_length = byte(len(p.short_message))
+}

pdu/submit_test.go

@@ -1,37 +1,52 @@
 package pdu
 
 import (
+	"bytes"
 	"testing"
 )
 
 // region encode
+// See examples: https://www.openmarket.com/docs/Content/apis/v4smpp/mt-examples.htm
+func TestEncodeFunctionCorrectlyEncodesAllFields(t *testing.T) {
+	p := &SUBMIT_SM{
+		header: &PDU_HEADER{
+			command_length:  0,
+			command_id:      4,
+			command_status:  0,
+			sequence_number: 378019,
+		},
+		service_type:           "OMV4",
+		source_addr_ton:        3,
+		source_addr_npi:        1,
+		source_addr:            "80362",
+		dest_addr_ton:          1,
+		dest_addr_npi:          1,
+		destination_addr:       "812345001000",
+		esm_class:              0,
+		protocol_id:            0,
+		priority_flag:          0,
+		schedule_delivery_time: "",
+		validity_period:        "180105120000004+",
+		registered_delivery:    1,
+		data_coding:            1, // The example uses 0 and claims to use GSM but the message is encoded as ASCII...
+		sm_default_msg_id:      0,
+		short_message:          "Reply Yes to opt in or No to opt out.",
+	}
+	p.UpdateSize()
+	buf := ByteBufferPool.Get(p.Size())
+	err := p.Encode(buf)
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+
+	expected := []byte{0,0,0,107,0,0,0,4,0,0,0,0,0,5,196,163,79,77,86,52,0,3,1,56,48,51,54,50,0,1,1,56,49,50,51,52,53,48,48,49,48,48,48,0,0,0,0,0,49,56,48,49,48,53,49,50,48,48,48,48,48,48,52,43,0,1,0,0,0,37,82,101,112,108,121,32,89,101,115,32,116,111,32,111,112,116,32,105,110,32,111,114,32,78,111,32,116,111,32,111,112,116,32,111,117,116,46}
+	if !bytes.Equal(buf.Bytes(), expected) {
+		t.Fatalf("expected %v, got %v", expected, buf.Bytes())
+	}
+}
 
 // func TestRealScenario(t *testing.T) {
-// 	expected := []byte{0, 0, 0, 54, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 1, 67, 77, 84, 0, 1, 1, 49, 50, 51, 52, 53, 0, 1, 1, 54, 55, 56, 57, 48, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 12, 72, 101, 108, 108, 111, 44, 32, 83, 77, 80, 80, 33}
-// 	p := &SUBMIT_SM{
-// 		header: PDU_HEADER{
-// 			command_length:  0,
-// 			command_id:      4,
-// 			command_status:  0,
-// 			sequence_number: 1,
-// 		},
-// 		service_type:           "CMT",
-// 		source_addr_ton:        1,
-// 		source_addr_npi:        1,
-// 		source_addr:            "12345",
-// 		dest_addr_ton:          1,
-// 		dest_addr_npi:          1,
-// 		destination_addr:       "67890",
-// 		esm_class:              0,
-// 		protocol_id:            0,
-// 		priority_flag:          0,
-// 		schedule_delivery_time: "",
-// 		validity_period:        "",
-// 		registered_delivery:    1,
-// 		data_coding:            0,
-// 		sm_default_msg_id:      0,
-// 		short_message:          "Hello, SMPP!",
-// 	}
+//
 // 	p.header.command_length = uint32(p.Size())
 // 	p.sm_length = byte(len(p.short_message))
 // 	buf := make([]byte, p.Size())