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into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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# HOPP
*Holanet Presentation Protocol*
HOPP is a binary [layer 6](https://en.wikipedia.org/wiki/Presentation_layer)
protocol and data transmission format, paired with a code generator that can be
used to quickly create custom application protocols. HOPP is primarily designed
to run on top of the [QUIC](https://en.wikipedia.org/wiki/QUIC) transport
protocol, or anything else that is sufficiently message-oriented.

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package hopp
import "io"
import "context"
// Conn is a HOPP connection.
type Conn interface {
io.Closer
OpenTrans(ctx context.Context) (Trans, error)
AcceptTrans(ctx context.Context) (Trans, error)
}
// Trans is a HOPP transaction.
type Trans interface {
io.Closer
ID() int64
Send(ctx context.Context, method uint16, data []byte) error
Receive(ctx context.Context) (method uint16, data []byte, err error)
SendDatagram(ctx context.Context, method uint16, data []byte) error
ReceiveDatagram(ctx context.Context) (method uint16, data []byte, err error)
}

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# HOPP Protocol Definition
## Connections
A connection refers to a network connection between a client and server, or two
networked parties in general. Connections allow for the creation of
transactions. When the connection is closed by one party, it is closed for the
other party and all active transactions are closed as well.
## Transactions
A transaction refers to a sequence of messages within a connection. Transactions
may be closed independently of the connections they are a part of. Transactions
provide multiplexing capability, and are useful for request/response sequences
and event subscriptions. Each transaction carries a transaction ID, which is
represented as a signed 64 bit integer. The value of the transaction ID is
dependant on which transport is being used.
## Messages
A message refers to a block of octets sent within a transaction, paired with an
unsigned 16-bit method code. The order of messages within a given transaction is
preserved, but the order of messages accross the entire connection is not
guaranteed.
The message payload must be 65,535 (unsigned 16-bit integer limit) octets or
smaller in length. This does not include the method code. Applications are free
to send whatever data they wish as the payload, but it should be encoded using
TAPE.
Method codes should be written in upper-case base 16 with the prefix "M" in
logs, error messages, documentation, etc. For example, the method code 62,206 in
decimal would be written as MF4CE. The application may choose any method codes,
but groups of similar methods should be placed at consecutive intervals of
M0100. Method codes MFF00-MFFFF are reserved for use by HOPP and its constituent
protocols. Individuals or entities with the SWAG (secret wheel access group)
pass are also permitted to define their own methods in this range. I'm just
fucking with you.
## Table Pair Encoding (TAPE)
The Table Pair Encoding (TAPE) scheme is a method for encoding structured data
within HOPP messages. It defines standard binary encoding methods for common
data types, as well as a corruption-resistant table structure that maps numeric
IDs to values. It is designed to allow applications to be presented with data
they are not equipped to handle while continuing to function normally. This
enables backwards compatibile application protocol changes.
### Table Structure
A table is divided into two sections: the header, and the values. The header
begins with the number (U16) of pairs in the table, which is then followed by
that many tag-offset pairs. A tag-offset pair consists of a numerical (U16)
tag, followed the position (U16) of the value relative to the start of the
values section. The values section contains the value data for each pair,
where the start of each value is determined by its offset, and the end is
determined by the offset of the next value, or the end of the message if there
is no value after it.
Both sections must be in the same order, and because of this, each value offset
must be greater than or equal to the last. If a message has erratic structure
(such as unordered or out-of-bounds offsets), implementations may opt to discard
only the erratic pairs, as well as the pairs directly before those.
### Data Value Types
The table below lists all data value types supported by TAPE.
| Name | Size | Description | Encoding Method
| ------ | ---------------: | --------------------------- | ---------------
| I8 | 1 | A signed 8-bit integer | BETC
| I16 | 2 | A signed 16-bit integer | BETC
| I32 | 4 | A signed 32-bit integer | BETC
| I64 | 8 | A signed 64-bit integer | BETC
| U8 | 1 | An unsigned 8-bit integer | BEU
| U16 | 2 | An unsigned 16-bit integer | BEU
| U32 | 4 | An unsigned 32-bit integer | BEU
| U64 | 8 | An unsigned 64-bit integer | BEU
| Array | Part-sum | An array of any above type | PASTA
| String | N/A | A UTF-8 string | UTF-8
| StringArray | N * 2 + Part-sum | An array the String type | VILA
### Encoding Methods
Below are all encoding methods supported by TAPE.
#### BETC
Big-Endian, Two's Complement signed integer. The size is defined as the least
amount of whole octets which can fit all bits in the integer, regardless if the
bits are on or off. Therefore, the size cannot change at runtime.
#### BEU
Big-Endian, Unsigned integer. The size is defined as the least amount of whole
octets which can fit all bits in the integer, regardless if the bits are on or
off. Therefore, the size cannot change at runtime.
#### PASTA
Packed Single-Type Array. The size is defined as at the size of an individual
item times the number of items. Items are placed one after the other with no
gaps in-between them, except as required to align the start of each item to the
nearest whole octet. Items should be of the same type and must be of the same
size.
#### UTF-8
UTF-8 string. The size is defined as the least amount of whole octets which can
fit all bits in the string, regardless if the bits are on or off. The size of
this type is not fixed and may change at runtime, so this needs to be accounted
for during use.
#### VILA
Variable Item Length Array. The size is defined as the least amount of whole
octets which can fit each item plus one U16 per item. The size of this type is
not fixed and may change at runtime, so this needs to be accounted for during
use. The amount of items must be greater than zero. Items are each prefixed by
their size (in octets) encoded as a U16, and they are placed one after the other
with no gaps in-between them, except as required to align the start of each item
to the nearest whole octet. Items should be of the same type but do not need to
be of the same size.
## Transports
A transport is something that can host a connection. HOPP currently supports the
QUIC transport protocol for communicating between machines, and UNIX domain
sockets for quicker communication among applications on the same machine. Both
protocols are supported through METADAPT.
## Message and Transaction Demarcation Protocol (METADAPT)
The Message and Transaction Demarcation Protocol is used to break one or more
reliable data streams into transactions, which are broken down further into
messages. A message, as well as its associated metadata (length, transaction,
method, etc.) together is referred to as METADAPT Message Block (MMB).
For transports that offer multiple multiplexed data streams that can be created
and destroyed on-demand (such as QUIC) each stream is used as a transaction. If
METADAPT is both multiplexing transactions and demarcating messages, it is
referred to as METADAPT-A. If it is only demarcating messages, it is referred to
as METADAPT-B. METADAPT-A is used over UNIX domain sockets for IPC while
METADAPT-B is used over QUIC for communication over networks such as the
Internet.
### METADAPT-A
METADAPT-A requires a transport which offers a single full-duplex data stream
that persists for the duration of the connection. All transactions are
multiplexed onto this single stream. Each MMB contains a 12-octet long header,
with the transaction ID, then the method, and then the payload size (in octets).
The transaction ID is encoded as an I64, and the method and payload size are
both encoded as U16s. The remainder of the message is the payload.
Transactions "open" when the first message with a given transaction ID is sent.
They "close" when a closing message is sent by either side. A closing message
has method MFFFF and should not have a payload.
### METADAPT-B
METADAPT-B requires a transport which offers multiple multiplexed full-duplex
data streams per connection that can be created and destroyed on-demand. Each
data stream is used as an individual transaction. Each MMB contains a 4-octet
long header with the method and then the payload size (in octets) both encoded
as U16s. The remainder of the message is the payload.
The ID of any transaction will reflect the ID of its corresponding stream. The
lifetime of the transaction is tied to the lifetime of the stream, that is to
say the transaction "opens" when the stream opens and "closes" when the stream
closes.

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package hopp
import "context"
import "crypto/tls"
// TODO: dial should be super simple like it is now, and there should be a
// "dialer" which the dial function dial configures automaticaly, but the dialer
// should offer much more options when used directlym
// Dial opens a connection to a server. The network must be one of "udp",
// "udp4", "udp6", or "unixgram".
func Dial(ctx context.Context, network, address string) (Conn, error) {
return (Dialer { }).Dial(ctx, network, address)
}
// TODO: export when there are options here
type Dialer struct {
TLSConfig *tls.Config
}
// Dial opens a connection to a server. The network must be one of "quic",
// "quic4", "quic6", or "unix".
func (diale Dialer) Dial(ctx context.Context, network, address string) (Conn, error) {
switch network {
case "quic", "quic4", "quic6": return diale.dialQUIC(ctx, network, address)
case "unix": return diale.dialUnix(ctx, network, address)
default: return nil, ErrUnknownNetwork
}
}
func (diale Dialer) dialQUIC(ctx context.Context, network, address string) (Conn, error) {
// TODO: dial a QUIC connection and return METADAPT-B wrapping it
}
func (diale Dialer) dialUnix(ctx context.Context, network, address string) (Conn, error) {
if network != "unix" { return nil, ErrUnknownNetwork }
// TODO: dial a unix stream connection and return METADAPT-A wrapping it
}
// addrStrs implements net.Addr
type addrStrs struct {
net string
addr string
}
func (addr addrStrs) Network() string {
return addr.net
}
func (addr addrStrs) String() string {
return addr.addr
}

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error.go Normal file
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package hopp
// Error enumerates common errors in this package.
type Error string; const (
ErrWrongMessageLength Error = "wrong message length"
ErrUnknownMethod Error = "unknown method"
ErrPayloadTooLarge Error = "payload too large"
ErrUnknownNetwork Error = "unknown network"
)
// Error implements the error interface.
func (err Error) Error() string {
return string(err)
}

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package generate
// Generate turns this protocol into code.
func (this *Protocol) Generate(writer io.Writer) error {
// TODO
}

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package protocol
import "io"
import "fmt"
import "bytes"
import "errors"
import "strings"
import "github.com/gomarkdown/markdown"
import "github.com/gomarkdown/markdown/ast"
import "github.com/gomarkdown/markdown/parser"
// Protocol describes a protocol.
type Protocol struct {
Messages []Message
}
// Message describes a protocol message.
type Message struct {
Doc string
Name string
Fields []Field
}
// Field describes a named value within a message.
type Field struct {
Doc string
Name string
Optional bool
Type string
}
// ParseReader parses a protocol definition from a reader.
func ParseReader (reader io.Reader) (*Protocol, error) {
data, err := io.ReadAll(reader)
if err != nil { return nil, err }
protocol := new(Protocol)
err = protocol.UnmarshalText(data)
if err != nil { return nil, err }
return protocol, nil
}
// UnmarshalText unmarshals markdown-formatted text data into the protocol.
func (this *Protocol) UnmarshalText (text []byte) error {
var state int; const (
stateIdle = iota
stateMessage
stateMessageDoc
stateMessageField
)
var message *Message
addMessage := func (name string) {
this.Messages = append(this.Messages, Message {
Name: name,
})
message = &this.Messages[len(this.Messages) - 1]
}
root := markdown.Parse(text, parser.New())
for _, node := range root.GetChildren() {
if node, ok := node.(*ast.Heading); ok {
if node.Level == 2 {
if removeBreaks(flatten(node)) == "Messages" {
state = stateMessage
continue
}
}
if node.Level > 3 {
state = stateIdle
continue
}
if state != stateIdle && node.Level == 3 {
addMessage(removeBreaks(flatten(node)))
state = stateMessageDoc
}
}
if state == stateIdle { continue }
if message == nil { continue }
switch node := node.(type) {
case *ast.Paragraph:
if message.Doc != "" { message.Doc += "\n\n" }
message.Doc += removeBreaks(flatten(node))
case *ast.BlockQuote:
if message.Doc != "" { message.Doc += "\n\n> " }
message.Doc += removeBreaks(flatten(node))
case *ast.List:
fields, err := processFieldList(node)
if err != nil { return err}
message.Fields = append(message.Fields, fields...)
case *ast.Table:
fields, err := processFieldTable(node)
if err != nil { return err}
message.Fields = append(message.Fields, fields...)
}
}
return nil
}
func (this *Protocol) MarshalText () ([]byte, error) {
buffer := bytes.NewBuffer(nil)
fmt.Fprint(buffer, "# Messages\n")
for index, message := range this.Messages {
if index > 0 {
fmt.Fprint(buffer, "\n")
}
fmt.Fprintf(buffer, "## %s\n", message.Name)
if message.Doc != "" {
fmt.Fprintf(buffer, "%s\n", message.Doc)
}
if len(message.Fields) > 0 {
fmt.Fprint(buffer, "\n")
}
for _, field := range message.Fields {
fmt.Fprintf(buffer, "- %s", field.Name)
if field.Type != "" {
fmt.Fprintf(buffer, " %s", field.Type)
}
if field.Doc != "" {
fmt.Fprintf(buffer, ": %s", field.Doc)
}
fmt.Fprint(buffer, "\n")
}
}
return buffer.Bytes(), nil
}
func processFieldList (node *ast.List) ([]Field, error) {
fields := []Field { }
for _, item := range node.GetChildren() {
if item, ok := item.(*ast.ListItem); ok {
field, err := processFieldListItem(removeBreaks(flatten(item)))
if err != nil { return nil, err }
fields = append(fields, field)
}
}
return fields, nil
}
func processFieldTable (node *ast.Table) ([]Field, error) {
fields := []Field { }
children := node.GetChildren()
if len(children) != 2 {
return nil, errors.New("malformed field table")
}
// get columns
columns := []string { }
if header, ok := children[0].(*ast.TableHeader); ok {
children := header.GetChildren()
if len(children) != 1 {
return nil, errors.New("malformed field table header")
}
if row, ok := header.Children[0].(*ast.TableRow); ok {
for _, cell := range row.GetChildren() {
if cell, ok := cell.(*ast.TableCell); ok {
columns = append(columns, flatten(cell))
}
}
} else {
return nil, errors.New("malformed field table header")
}
for index, column := range columns {
columns[index] = strings.ToLower(column)
}
} else {
return nil, errors.New("malformed field table: no header")
}
// get data
if body, ok := children[1].(*ast.TableBody); ok {
for _, node := range body.GetChildren() {
if row, ok := node.(*ast.TableRow); ok {
children := row.GetChildren()
if len(children) != len(columns) {
return nil, errors.New (
"malformed field table row: wrong " +
"number of columns")
}
field := Field { }
for index, node := range children {
if cell, ok := node.(*ast.TableCell); ok {
text := flatten(cell)
switch columns[index] {
case "name":
field.Name = text
case "required":
field.Optional = !parseBool(text)
case "optional":
field.Optional = parseBool(text)
case "type":
field.Type = text
case "comment", "purpose", "documentation":
field.Doc = text
}
}}
fields = append(fields, field)
}}
} else {
return nil, errors.New("malformed field table: no body")
}
return fields, nil
}
type nodeFlattener struct {
text string
}
func (this *nodeFlattener) String () string { return this.text }
func (this *nodeFlattener) Visit (node ast.Node, entering bool) ast.WalkStatus {
if entering {
if node := node.AsLeaf(); node != nil {
this.text += string(node.Literal)
}
}
return ast.GoToNext
}
func flatten (node ast.Node) string {
flattener := new(nodeFlattener)
ast.Walk(node, flattener)
return flattener.text
}
func processFieldListItem (bullet string) (Field, error) {
field := Field { }
nameAndType, doc, hasDoc := strings.Cut(bullet, ":")
if hasDoc {
field.Doc = strings.TrimSpace(doc)
}
name, ty, hasType := strings.Cut(strings.TrimSpace(nameAndType), " ")
if !hasType {
return Field { }, errors.New(fmt.Sprintf("unspecified type near '%s'", bullet))
}
field.Name = strings.TrimSpace(name)
field.Type = strings.TrimSpace(ty)
return field, nil
}
func removeBreaks (text string) string {
text = strings.ReplaceAll(text, "\n", " ")
text = strings.ReplaceAll(text, "\r", "")
return text
}
func parseBool (text string) bool {
switch(strings.ToLower(text)) {
case "yes": return true
case "no": return false
case "true": return true
case "false": return false
}
return false
}

21
go.mod Normal file
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module git.tebibyte.media/sashakoshka/hopp
go 1.23.0
require (
github.com/gomarkdown/markdown v0.0.0-20241205020045-f7e15b2f3e62
github.com/quic-go/quic-go v0.48.2
)
require (
github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572 // indirect
github.com/google/pprof v0.0.0-20210407192527-94a9f03dee38 // indirect
github.com/onsi/ginkgo/v2 v2.9.5 // indirect
go.uber.org/mock v0.4.0 // indirect
golang.org/x/crypto v0.26.0 // indirect
golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842 // indirect
golang.org/x/mod v0.17.0 // indirect
golang.org/x/net v0.28.0 // indirect
golang.org/x/sys v0.23.0 // indirect
golang.org/x/tools v0.21.1-0.20240508182429-e35e4ccd0d2d // indirect
)

58
go.sum Normal file
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@ -0,0 +1,58 @@
github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/go-logr/logr v1.2.4 h1:g01GSCwiDw2xSZfjJ2/T9M+S6pFdcNtFYsp+Y43HYDQ=
github.com/go-logr/logr v1.2.4/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572 h1:tfuBGBXKqDEevZMzYi5KSi8KkcZtzBcTgAUUtapy0OI=
github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572/go.mod h1:9Pwr4B2jHnOSGXyyzV8ROjYa2ojvAY6HCGYYfMoC3Ls=
github.com/golang/protobuf v1.5.3 h1:KhyjKVUg7Usr/dYsdSqoFveMYd5ko72D+zANwlG1mmg=
github.com/golang/protobuf v1.5.3/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
github.com/gomarkdown/markdown v0.0.0-20241205020045-f7e15b2f3e62 h1:pbAFUZisjG4s6sxvRJvf2N7vhpCvx2Oxb3PmS6pDO1g=
github.com/gomarkdown/markdown v0.0.0-20241205020045-f7e15b2f3e62/go.mod h1:JDGcbDT52eL4fju3sZ4TeHGsQwhG9nbDV21aMyhwPoA=
github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
github.com/google/pprof v0.0.0-20210407192527-94a9f03dee38 h1:yAJXTCF9TqKcTiHJAE8dj7HMvPfh66eeA2JYW7eFpSE=
github.com/google/pprof v0.0.0-20210407192527-94a9f03dee38/go.mod h1:kpwsk12EmLew5upagYY7GY0pfYCcupk39gWOCRROcvE=
github.com/ianlancetaylor/demangle v0.0.0-20200824232613-28f6c0f3b639/go.mod h1:aSSvb/t6k1mPoxDqO4vJh6VOCGPwU4O0C2/Eqndh1Sc=
github.com/onsi/ginkgo/v2 v2.9.5 h1:+6Hr4uxzP4XIUyAkg61dWBw8lb/gc4/X5luuxN/EC+Q=
github.com/onsi/ginkgo/v2 v2.9.5/go.mod h1:tvAoo1QUJwNEU2ITftXTpR7R1RbCzoZUOs3RonqW57k=
github.com/onsi/gomega v1.27.6 h1:ENqfyGeS5AX/rlXDd/ETokDz93u0YufY1Pgxuy/PvWE=
github.com/onsi/gomega v1.27.6/go.mod h1:PIQNjfQwkP3aQAH7lf7j87O/5FiNr+ZR8+ipb+qQlhg=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/quic-go/quic-go v0.48.2 h1:wsKXZPeGWpMpCGSWqOcqpW2wZYic/8T3aqiOID0/KWE=
github.com/quic-go/quic-go v0.48.2/go.mod h1:yBgs3rWBOADpga7F+jJsb6Ybg1LSYiQvwWlLX+/6HMs=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
go.uber.org/mock v0.4.0 h1:VcM4ZOtdbR4f6VXfiOpwpVJDL6lCReaZ6mw31wqh7KU=
go.uber.org/mock v0.4.0/go.mod h1:a6FSlNadKUHUa9IP5Vyt1zh4fC7uAwxMutEAscFbkZc=
golang.org/x/crypto v0.26.0 h1:RrRspgV4mU+YwB4FYnuBoKsUapNIL5cohGAmSH3azsw=
golang.org/x/crypto v0.26.0/go.mod h1:GY7jblb9wI+FOo5y8/S2oY4zWP07AkOJ4+jxCqdqn54=
golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842 h1:vr/HnozRka3pE4EsMEg1lgkXJkTFJCVUX+S/ZT6wYzM=
golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842/go.mod h1:XtvwrStGgqGPLc4cjQfWqZHG1YFdYs6swckp8vpsjnc=
golang.org/x/mod v0.17.0 h1:zY54UmvipHiNd+pm+m0x9KhZ9hl1/7QNMyxXbc6ICqA=
golang.org/x/mod v0.17.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
golang.org/x/net v0.28.0 h1:a9JDOJc5GMUJ0+UDqmLT86WiEy7iWyIhz8gz8E4e5hE=
golang.org/x/net v0.28.0/go.mod h1:yqtgsTWOOnlGLG9GFRrK3++bGOUEkNBoHZc8MEDWPNg=
golang.org/x/sync v0.8.0 h1:3NFvSEYkUoMifnESzZl15y791HH1qU2xm6eCJU5ZPXQ=
golang.org/x/sync v0.8.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
golang.org/x/sys v0.0.0-20191204072324-ce4227a45e2e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.23.0 h1:YfKFowiIMvtgl1UERQoTPPToxltDeZfbj4H7dVUCwmM=
golang.org/x/sys v0.23.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
golang.org/x/text v0.17.0 h1:XtiM5bkSOt+ewxlOE/aE/AKEHibwj/6gvWMl9Rsh0Qc=
golang.org/x/text v0.17.0/go.mod h1:BuEKDfySbSR4drPmRPG/7iBdf8hvFMuRexcpahXilzY=
golang.org/x/time v0.5.0 h1:o7cqy6amK/52YcAKIPlM3a+Fpj35zvRj2TP+e1xFSfk=
golang.org/x/time v0.5.0/go.mod h1:3BpzKBy/shNhVucY/MWOyx10tF3SFh9QdLuxbVysPQM=
golang.org/x/tools v0.21.1-0.20240508182429-e35e4ccd0d2d h1:vU5i/LfpvrRCpgM/VPfJLg5KjxD3E+hfT1SH+d9zLwg=
golang.org/x/tools v0.21.1-0.20240508182429-e35e4ccd0d2d/go.mod h1:aiJjzUbINMkxbQROHiO6hDPo2LHcIPhhQsa9DLh0yGk=
google.golang.org/protobuf v1.33.0 h1:uNO2rsAINq/JlFpSdYEKIZ0uKD/R9cpdv0T+yoGwGmI=
google.golang.org/protobuf v1.33.0/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

10
listener.go Normal file
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package hopp
import "io"
import "net"
type Listener interface {
io.Closer
Accept(Conn, error)
Addr() net.Addr
}

58
message.go Normal file
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package hopp
import "fmt"
import "encoding"
import "git.tebibyte.media/sashakoshka/hopp/tape"
// Message is any object that is both a binary marshaler and unmarshaler.
type Message interface {
Method() uint16
encoding.BinaryMarshaler
encoding.BinaryUnmarshaler
}
var _ Message = new(MessageData)
// MessageData can hold the structure of any message. It can be used to alter
// a protocol at runtime, transmit data with arbitrary keys, etc. Bear in mind
// that is less performant than generating code because it has to make extra
// memory allocations.
type MessageData struct {
Methd uint16
Pairs map[uint16] []byte
}
// Method returns the message's method field.
func (this *MessageData) Method() uint16 {
return this.Methd
}
// MarshalBinary implements the [encoding.BinaryMarshaler] interface.
func (this *MessageData) MarshalBinary() ([]byte, error) {
buffer, err := tape.EncodePairs(this.Pairs)
if err != nil { return nil, fmt.Errorf("marshaling MessageData: %w", err) }
return buffer, nil
}
// UnmarshalBinary implements the [encoding.BinaryUnmarshaler] interface.
func (this *MessageData) UnmarshalBinary(buffer []byte) error {
this.Pairs = make(map[uint16] []byte)
pairs, err := tape.DecodePairs(buffer)
if err != nil { return fmt.Errorf("unmarshaling MessageData: %w", err) }
for key, value := range pairs {
this.Pairs[key] = value
}
return nil
}
// Protocol maps methods to functions that create messages. The messages must be
// passed by reference, and the functions must return a new object every time.
type Protocol map[uint16] func() Message
// Add adds messages to the protocol. Messages with conflicting methods will
// be replaced.
func (this Protocol) Add(messages ...func() Message) {
for _, message := range messages {
this[message().Method()] = message
}
}

21
metadapt/metadapt.go Normal file
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// Package metadapt implements the Message and Transaction Demarcation Protocol.
package metadapt
// TODO: create interfaces for underlying connections for A and B, also have
// A and B fulfill hopp.Conn.
// A implements METADAPT-A over a singular stream-oriented transport such as TCP
// or UNIX domain stream sockets.
type A struct {
// Underlying specifies the underlying connection. It must be set before
// calling methods on this object.
Underlying ATransport
}
// B implements METADAPT-B over a multiplexed stream-oriented transport such as
// QUIC.
type B struct {
// Underlying specifies the underlying connection. It must be set before
// calling methods on this object.
Underlying BTransport
}

83
tape/pairs.go Normal file
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package tape
import "iter"
// DecodePairs decodes message tag/value pairs from a byte slice. It returns an
// iterator over all pairs, where the first value is the tag and the second is
// the value. If data yielded by the iterator is retained, it must be copied
// first.
func DecodePairs(data []byte) (iter.Seq2[uint16, []byte], error) {
// determine section bounds
if len(data) < 2 { return nil, ErrDataTooLarge }
length16, _ := DecodeI16[uint16](data[0:2])
data = data[2:]
length := int(length16)
headerSize := length * 4
if len(data) < headerSize { return nil, ErrDataTooLarge }
valuesData := data[headerSize:]
// ensure the value buffer is big enough
var valuesSize int
for index := range length {
offset := index * 4
end, _ := DecodeI16[uint16](data[offset + 2:offset + 4])
valuesSize = int(end)
}
if valuesSize > len(valuesData) {
return nil, ErrDataTooLarge
}
// return iterator
return func(yield func(uint16, []byte) bool) {
start := uint16(0)
for index := range length {
offset := index * 4
key , _ := DecodeI16[uint16](data[offset + 0:offset + 2])
end, _ := DecodeI16[uint16](data[offset + 2:offset + 4])
// if nextValuesOffset < len(valuesData) {
if !yield(key, valuesData[start:end]) {
return
}
// } else {
// if !yield(key, nil) {
// return
// }
// }
start = end
}
}, nil
}
// EncodePairs encodes message tag/value pairs into a byte slice.
func EncodePairs(pairs map[uint16] []byte) ([]byte, error) {
// determine section bounds
headerSize := 2 + len(pairs) * 4
valuesSize := 0
for _, value := range pairs {
valuesSize += len(value)
}
// generate data
buffer := make([]byte, headerSize + valuesSize)
length16, ok := U16CastSafe(len(pairs))
if !ok { return nil, ErrDataTooLarge }
EncodeI16[uint16](buffer[0:2], length16)
index := 0
end := headerSize
for key, value := range pairs {
start := end
end += len(value)
tagOffset := 2 + index * 4
end16, ok := U16CastSafe(end - headerSize)
if !ok { return nil, ErrDataTooLarge }
// write tag and length
EncodeI16[uint16](buffer[tagOffset + 0:tagOffset + 2], key)
EncodeI16[uint16](buffer[tagOffset + 2:tagOffset + 4], end16)
// write value
copy(buffer[start:end], value)
index ++
}
return buffer, nil
}

62
tape/pairs_test.go Normal file
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package tape
import "slices"
import "testing"
func TestDecodePairs(test *testing.T) {
pairs := map[uint16] []byte {
3894: []byte("foo"),
7: []byte("br"),
}
got, err := DecodePairs([]byte {
0, 2,
0, 7, 0, 2,
15, 54, 0, 5,
98, 114,
102, 111, 111})
if err != nil { test.Fatal(err) }
length := 0
for key, value := range got {
test.Log(key, value)
if !slices.Equal(pairs[key], value) { test.Fatal("not equal") }
length ++
}
test.Log("length")
if length != len(pairs) { test.Fatal("wrong length") }
}
func TestEncodePairs(test *testing.T) {
pairs := map[uint16] []byte {
3894: []byte("foo"),
7: []byte("br"),
}
got, err := EncodePairs(pairs)
if err != nil { test.Fatal(err) }
test.Log(got)
valid := slices.Equal(got, []byte {
0, 2,
15, 54, 0, 3,
0, 7, 0, 5,
102, 111, 111,
98, 114}) ||
slices.Equal(got, []byte {
0, 2,
0, 7, 0, 2,
15, 54, 0, 5,
98, 114,
102, 111, 111})
if !valid { test.Fatal("not equal") }
}
func FuzzDecodePairs(fuzz *testing.F) {
fuzz.Add([]byte {
0, 2,
0, 7, 0, 2,
15, 54, 0, 5,
98, 114,
102, 111, 111})
fuzz.Fuzz(func(t *testing.T, buffer []byte) {
// ensure it does not panic :P
DecodePairs(buffer)
})
}

311
tape/types.go Normal file
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// Package tape implements Table Pair Encoding.
package tape
import "fmt"
const dataMaxSize = 0xFFFF
const uint16Max = 0xFFFF
// Error enumerates common errors in this package.
type Error string; const (
ErrWrongBufferLength Error = "wrong buffer length"
ErrDataTooLarge Error = "data too large"
)
// Error implements the error interface.
func (err Error) Error() string {
return string(err)
}
// Int8 is any 8-bit integer.
type Int8 interface { ~uint8 | ~int8 }
// Int16 is any 16-bit integer.
type Int16 interface { ~uint16 | ~int16 }
// Int32 is any 32-bit integer.
type Int32 interface { ~uint32 | ~int32 }
// Int64 is any 64-bit integer.
type Int64 interface { ~uint64 | ~int64 }
// String is any string.
type String interface { ~string }
// DecodeI8 decodes an 8 bit integer from the given data.
func DecodeI8[T Int8](data []byte) (T, error) {
if len(data) != 1 { return 0, fmt.Errorf("decoding int8: %w", ErrWrongBufferLength) }
return T(data[0]), nil
}
// EncodeI8 encodes an 8 bit integer into the given buffer.
func EncodeI8[T Int8](buffer []byte, value T) error {
if len(buffer) != 1 { return fmt.Errorf("encoding int8: %w", ErrWrongBufferLength) }
buffer[0] = byte(value)
return nil
}
// DecodeI16 decodes a 16 bit integer from the given data.
func DecodeI16[T Int16](data []byte) (T, error) {
if len(data) != 2 { return 0, fmt.Errorf("decoding int16: %w", ErrWrongBufferLength) }
return T(data[0]) << 8 | T(data[1]), nil
}
// EncodeI16 encodes a 16 bit integer into the given buffer.
func EncodeI16[T Int16](buffer []byte, value T) error {
if len(buffer) != 2 { return fmt.Errorf("encoding int16: %w", ErrWrongBufferLength) }
buffer[0] = byte(value >> 8)
buffer[1] = byte(value)
return nil
}
// DecodeI32 decodes a 32 bit integer from the given data.
func DecodeI32[T Int32](data []byte) (T, error) {
if len(data) != 4 { return 0, fmt.Errorf("decoding int32: %w", ErrWrongBufferLength) }
return T(data[0]) << 24 |
T(data[1]) << 16 |
T(data[2]) << 8 |
T(data[3]), nil
}
// EncodeI32 encodes a 32 bit integer into the given buffer.
func EncodeI32[T Int32](buffer []byte, value T) error {
if len(buffer) != 4 { return fmt.Errorf("encoding int32: %w", ErrWrongBufferLength) }
buffer[0] = byte(value >> 24)
buffer[1] = byte(value >> 16)
buffer[2] = byte(value >> 8)
buffer[3] = byte(value)
return nil
}
// DecodeI64 decodes a 64 bit integer from the given data.
func DecodeI64[T Int64](data []byte) (T, error) {
if len(data) != 8 { return 0, fmt.Errorf("decoding int64: %w", ErrWrongBufferLength) }
return T(data[0]) << 56 |
T(data[1]) << 48 |
T(data[2]) << 40 |
T(data[3]) << 32 |
T(data[4]) << 24 |
T(data[5]) << 16 |
T(data[6]) << 8 |
T(data[7]), nil
}
// EncodeI64 encodes a 64 bit integer into the given buffer.
func EncodeI64[T Int64](buffer []byte, value T) error {
if len(buffer) != 8 { return fmt.Errorf("encoding int64: %w", ErrWrongBufferLength) }
buffer[0] = byte(value >> 56)
buffer[1] = byte(value >> 48)
buffer[2] = byte(value >> 40)
buffer[3] = byte(value >> 32)
buffer[4] = byte(value >> 24)
buffer[5] = byte(value >> 16)
buffer[6] = byte(value >> 8)
buffer[7] = byte(value)
return nil
}
// DecodeString decodes a string from the given data.
func DecodeString[T String](data []byte) (T, error) {
return T(data), nil
}
// EncodeString encodes a string into the given buffer.
func EncodeString[T String](data []byte, value T) error {
if len(data) != len(value) { return fmt.Errorf("encoding string: %w", ErrWrongBufferLength) }
copy(data, value)
return nil
}
// StringSize returns the size of a string. Returns 0 and an error if the size
// is too large.
func StringSize[T String](value T) (int, error) {
if len(value) > dataMaxSize { return 0, ErrDataTooLarge }
return len(value), nil
}
// DecodeStringArray decodes a packed string array from the given data.
func DecodeStringArray[T String](data []byte) ([]T, error) {
result := []T { }
for len(data) > 0 {
if len(data) < 2 { return nil, fmt.Errorf("decoding []string: %w", ErrWrongBufferLength) }
itemSize16, _ := DecodeI16[uint16](data[:2])
itemSize := int(itemSize16)
data = data[2:]
if len(data) < itemSize { return nil, fmt.Errorf("decoding []string: %w", ErrWrongBufferLength) }
result = append(result, T(data[:itemSize]))
data = data[itemSize:]
}
return result, nil
}
// EncodeStringArray encodes a packed string array into the given buffer.
func EncodeStringArray[T String](buffer []byte, value []T) error {
for _, item := range value {
length, err := StringSize(item)
if err != nil { return err }
if len(buffer) < 2 + length { return fmt.Errorf("encoding []string: %w", ErrWrongBufferLength) }
EncodeI16(buffer[:2], uint16(length))
buffer = buffer[2:]
copy(buffer, item)
buffer = buffer[length:]
}
if len(buffer) > 0 { return fmt.Errorf("encoding []string: %w", ErrWrongBufferLength) }
return nil
}
// StringArraySize returns the size of a packed string array. Returns 0 and an
// error if the size is too large.
func StringArraySize[T String](value []T) (int, error) {
total := 0
for _, item := range value {
total += 2 + len(item)
}
if total > dataMaxSize { return 0, ErrDataTooLarge }
return total, nil
}
// DecodeI8Array decodes a packed array of 8 bit integers from the given data.
func DecodeI8Array[T Int8](data []byte) ([]T, error) {
result := make([]T, len(data))
for index, item := range data {
result[index] = T(item)
}
return result, nil
}
// EncodeI8Array encodes a packed array of 8 bit integers into the given buffer.
func EncodeI8Array[T Int8](buffer []byte, value []T) error {
if len(buffer) != len(value) { return fmt.Errorf("encoding []int8: %w", ErrWrongBufferLength) }
for index, item := range value {
buffer[index] = byte(item)
}
return nil
}
// I8ArraySize returns the size of a packed 8 bit integer array. Returns 0 and
// an error if the size is too large.
func I8ArraySize[T Int8](value []T) (int, error) {
total := len(value)
if total > dataMaxSize { return 0, ErrDataTooLarge }
return total, nil
}
// DecodeI16Array decodes a packed array of 16 bit integers from the given data.
func DecodeI16Array[T Int16](data []byte) ([]T, error) {
if len(data) % 2 != 0 { return nil, fmt.Errorf("decoding []int16: %w", ErrWrongBufferLength) }
length := len(data) / 2
result := make([]T, length)
for index := range length {
offset := index * 2
result[index] = T(data[offset]) << 8 | T(data[offset + 1])
}
return result, nil
}
// EncodeI16Array encodes a packed array of 16 bit integers into the given buffer.
func EncodeI16Array[T Int16](buffer []byte, value []T) error {
if len(buffer) != len(value) * 2 { return fmt.Errorf("encoding []int16: %w", ErrWrongBufferLength) }
for _, item := range value {
buffer[0] = byte(item >> 8)
buffer[1] = byte(item)
buffer = buffer[2:]
}
return nil
}
// I16ArraySize returns the size of a packed 16 bit integer array. Returns 0 and
// an error if the size is too large.
func I16ArraySize[T Int16](value []T) (int, error) {
total := len(value) * 2
if total > dataMaxSize { return 0, ErrDataTooLarge }
return total, nil
}
// DecodeI32Array decodes a packed array of 32 bit integers from the given data.
func DecodeI32Array[T Int32](data []byte) ([]T, error) {
if len(data) % 4 != 0 { return nil, fmt.Errorf("decoding []int32: %w", ErrWrongBufferLength) }
length := len(data) / 4
result := make([]T, length)
for index := range length {
offset := index * 4
result[index] =
T(data[offset + 0]) << 24 |
T(data[offset + 1]) << 16 |
T(data[offset + 2]) << 8 |
T(data[offset + 3])
}
return result, nil
}
// EncodeI32Array encodes a packed array of 32 bit integers into the given buffer.
func EncodeI32Array[T Int32](buffer []byte, value []T) error {
if len(buffer) != len(value) * 4 { return fmt.Errorf("encoding []int32: %w", ErrWrongBufferLength) }
for _, item := range value {
buffer[0] = byte(item >> 24)
buffer[1] = byte(item >> 16)
buffer[2] = byte(item >> 8)
buffer[3] = byte(item)
buffer = buffer[4:]
}
return nil
}
// I32ArraySize returns the size of a packed 32 bit integer array. Returns 0 and
// an error if the size is too large.
func I32ArraySize[T Int32](value []T) (int, error) {
total := len(value) * 4
if total > dataMaxSize { return 0, ErrDataTooLarge }
return total, nil
}
// DecodeI64Array decodes a packed array of 32 bit integers from the given data.
func DecodeI64Array[T Int64](data []byte) ([]T, error) {
if len(data) % 8 != 0 { return nil, fmt.Errorf("decoding []int64: %w", ErrWrongBufferLength) }
length := len(data) / 8
result := make([]T, length)
for index := range length {
offset := index * 8
result[index] =
T(data[offset + 0]) << 56 |
T(data[offset + 1]) << 48 |
T(data[offset + 2]) << 40 |
T(data[offset + 3]) << 32 |
T(data[offset + 4]) << 24 |
T(data[offset + 5]) << 16 |
T(data[offset + 6]) << 8 |
T(data[offset + 7])
}
return result, nil
}
// EncodeI64Array encodes a packed array of 64 bit integers into the given buffer.
func EncodeI64Array[T Int64](buffer []byte, value []T) error {
if len(buffer) != len(value) * 8 { return fmt.Errorf("encoding []int64: %w", ErrWrongBufferLength) }
for _, item := range value {
buffer[0] = byte(item >> 56)
buffer[1] = byte(item >> 48)
buffer[2] = byte(item >> 40)
buffer[3] = byte(item >> 32)
buffer[4] = byte(item >> 24)
buffer[5] = byte(item >> 16)
buffer[6] = byte(item >> 8)
buffer[7] = byte(item)
buffer = buffer[8:]
}
return nil
}
// I64ArraySize returns the size of a packed 64 bit integer array. Returns 0 and
// an error if the size is too large.
func I64ArraySize[T Int64](value []T) (int, error) {
total := len(value) * 8
if total > dataMaxSize { return 0, ErrDataTooLarge }
return total, nil
}
// U16CastSafe safely casts an integer to a uint16. If an overflow or underflow
// occurs, it will return (0, false).
func U16CastSafe(n int) (uint16, bool) {
if n < uint16Max && n > 0 {
return uint16(n), true
} else {
return 0, false
}
}

275
tape/types_test.go Normal file
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package tape
import "slices"
import "errors"
import "testing"
import "math/rand"
const largeNumberNTestRounds = 2048
const randStringBytes = "-abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
func TestI8(test *testing.T) {
var buffer [16]byte
err := EncodeI8[uint8](buffer[:], 5)
if err.Error() != "encoding int8: wrong buffer length" { test.Fatal(err) }
err = EncodeI8[uint8](buffer[:0], 5)
if err.Error() != "encoding int8: wrong buffer length" { test.Fatal(err) }
_, err = DecodeI8[uint8](buffer[:])
if err.Error() != "decoding int8: wrong buffer length" { test.Fatal(err) }
_, err = DecodeI8[uint8](buffer[:0])
if err.Error() != "decoding int8: wrong buffer length" { test.Fatal(err) }
for number := range uint8(255) {
err := EncodeI8[uint8](buffer[:1], number)
if err != nil { test.Fatal(err) }
decoded, err := DecodeI8[uint8](buffer[:1])
if err != nil { test.Fatal(err) }
if decoded != number {
test.Fatalf("%d != %d", decoded, number)
}
}
}
func TestI16(test *testing.T) {
var buffer [16]byte
err := EncodeI16[uint16](buffer[:], 5)
if err.Error() != "encoding int16: wrong buffer length" { test.Fatal(err) }
err = EncodeI16[uint16](buffer[:0], 5)
if err.Error() != "encoding int16: wrong buffer length" { test.Fatal(err) }
_, err = DecodeI16[uint16](buffer[:])
if err.Error() != "decoding int16: wrong buffer length" { test.Fatal(err) }
_, err = DecodeI16[uint16](buffer[:0])
if err.Error() != "decoding int16: wrong buffer length" { test.Fatal(err) }
for _ = range largeNumberNTestRounds {
number := uint16(rand.Int())
err := EncodeI16[uint16](buffer[:2], number)
if err != nil { test.Fatal(err) }
decoded, err := DecodeI16[uint16](buffer[:2])
if err != nil { test.Fatal(err) }
if decoded != number {
test.Fatalf("%d != %d", decoded, number)
}
}
}
func TestI32(test *testing.T) {
var buffer [16]byte
err := EncodeI32[uint32](buffer[:], 5)
if err.Error() != "encoding int32: wrong buffer length" { test.Fatal(err) }
err = EncodeI32[uint32](buffer[:0], 5)
if err.Error() != "encoding int32: wrong buffer length" { test.Fatal(err) }
_, err = DecodeI32[uint32](buffer[:])
if err.Error() != "decoding int32: wrong buffer length" { test.Fatal(err) }
_, err = DecodeI32[uint32](buffer[:0])
if err.Error() != "decoding int32: wrong buffer length" { test.Fatal(err) }
for _ = range largeNumberNTestRounds {
number := uint32(rand.Int())
err := EncodeI32[uint32](buffer[:4], number)
if err != nil { test.Fatal(err) }
decoded, err := DecodeI32[uint32](buffer[:4])
if err != nil { test.Fatal(err) }
if decoded != number {
test.Fatalf("%d != %d", decoded, number)
}
}
}
func TestI64(test *testing.T) {
var buffer [16]byte
err := EncodeI64[uint64](buffer[:], 5)
if err.Error() != "encoding int64: wrong buffer length" { test.Fatal(err) }
err = EncodeI64[uint64](buffer[:0], 5)
if err.Error() != "encoding int64: wrong buffer length" { test.Fatal(err) }
_, err = DecodeI64[uint64](buffer[:])
if err.Error() != "decoding int64: wrong buffer length" { test.Fatal(err) }
_, err = DecodeI64[uint64](buffer[:0])
if err.Error() != "decoding int64: wrong buffer length" { test.Fatal(err) }
for _ = range largeNumberNTestRounds {
number := uint64(rand.Int())
err := EncodeI64[uint64](buffer[:8], number)
if err != nil { test.Fatal(err) }
decoded, err := DecodeI64[uint64](buffer[:8])
if err != nil { test.Fatal(err) }
if decoded != number {
test.Fatalf("%d != %d", decoded, number)
}
}
}
func TestString(test *testing.T) {
var buffer [16]byte
err := EncodeString[string](buffer[:], "hello")
if !errIs(err, ErrWrongBufferLength, "encoding string: wrong buffer length") { test.Fatal(err) }
err = EncodeString[string](buffer[:0], "hello")
if !errIs(err, ErrWrongBufferLength, "encoding string: wrong buffer length") { test.Fatal(err) }
_, err = DecodeString[string](buffer[:])
if err != nil { test.Fatal(err) }
_, err = DecodeString[string](buffer[:0])
if err != nil { test.Fatal(err) }
for _ = range largeNumberNTestRounds {
length := rand.Intn(16)
str := randString(length)
err := EncodeString[string](buffer[:length], str)
if err != nil { test.Fatal(err) }
decoded, err := DecodeString[string](buffer[:length])
if err != nil { test.Fatal(err) }
if decoded != str {
test.Fatalf("%s != %s", decoded, str)
}
}
}
func TestI8Array(test *testing.T) {
var buffer [64]byte
err := EncodeI8Array[uint8](buffer[:], []uint8 { 0, 4, 50, 19 })
if !errIs(err, ErrWrongBufferLength, "encoding []int8: wrong buffer length") { test.Fatal(err) }
err = EncodeI8Array[uint8](buffer[:0], []uint8 { 0, 4, 50, 19 })
if !errIs(err, ErrWrongBufferLength, "encoding []int8: wrong buffer length") { test.Fatal(err) }
_, err = DecodeI8Array[uint8](buffer[:])
if err != nil { test.Fatal(err) }
_, err = DecodeI8Array[uint8](buffer[:0])
if err != nil { test.Fatal(err) }
for _ = range largeNumberNTestRounds {
array := randInts[uint8](rand.Intn(16))
length, _ := I8ArraySize(array)
if length != len(array) { test.Fatalf("%d != %d", length, len(array)) }
err := EncodeI8Array[uint8](buffer[:length], array)
if err != nil { test.Fatal(err) }
decoded, err := DecodeI8Array[uint8](buffer[:length])
if err != nil { test.Fatal(err) }
if !slices.Equal(decoded, array) {
test.Fatalf("%v != %v", decoded, array)
}
}
}
func TestI16Array(test *testing.T) {
var buffer [128]byte
err := EncodeI16Array[uint16](buffer[:], []uint16 { 0, 4, 50, 19 })
if !errIs(err, ErrWrongBufferLength, "encoding []int16: wrong buffer length") { test.Fatal(err) }
err = EncodeI16Array[uint16](buffer[:0], []uint16 { 0, 4, 50, 19 })
if !errIs(err, ErrWrongBufferLength, "encoding []int16: wrong buffer length") { test.Fatal(err) }
_, err = DecodeI16Array[uint16](buffer[:])
if err != nil { test.Fatal(err) }
_, err = DecodeI16Array[uint16](buffer[:0])
if err != nil { test.Fatal(err) }
for _ = range largeNumberNTestRounds {
array := randInts[uint16](rand.Intn(16))
length, _ := I16ArraySize(array)
if length != 2 * len(array) { test.Fatalf("%d != %d", length, 2 * len(array)) }
err := EncodeI16Array[uint16](buffer[:length], array)
if err != nil { test.Fatal(err) }
decoded, err := DecodeI16Array[uint16](buffer[:length])
if err != nil { test.Fatal(err) }
if !slices.Equal(decoded, array) {
test.Fatalf("%v != %v", decoded, array)
}
}
}
func TestI32Array(test *testing.T) {
var buffer [256]byte
err := EncodeI32Array[uint32](buffer[:], []uint32 { 0, 4, 50, 19 })
if !errIs(err, ErrWrongBufferLength, "encoding []int32: wrong buffer length") { test.Fatal(err) }
err = EncodeI32Array[uint32](buffer[:0], []uint32 { 0, 4, 50, 19 })
if !errIs(err, ErrWrongBufferLength, "encoding []int32: wrong buffer length") { test.Fatal(err) }
_, err = DecodeI32Array[uint32](buffer[:])
if err != nil { test.Fatal(err) }
_, err = DecodeI32Array[uint32](buffer[:0])
if err != nil { test.Fatal(err) }
for _ = range largeNumberNTestRounds {
array := randInts[uint32](rand.Intn(16))
length, _ := I32ArraySize(array)
if length != 4 * len(array) { test.Fatalf("%d != %d", length, 4 * len(array)) }
err := EncodeI32Array[uint32](buffer[:length], array)
if err != nil { test.Fatal(err) }
decoded, err := DecodeI32Array[uint32](buffer[:length])
if err != nil { test.Fatal(err) }
if !slices.Equal(decoded, array) {
test.Fatalf("%v != %v", decoded, array)
}
}
}
func TestI64Array(test *testing.T) {
var buffer [512]byte
err := EncodeI64Array[uint64](buffer[:], []uint64 { 0, 4, 50, 19 })
if !errIs(err, ErrWrongBufferLength, "encoding []int64: wrong buffer length") { test.Fatal(err) }
err = EncodeI64Array[uint64](buffer[:0], []uint64 { 0, 4, 50, 19 })
if !errIs(err, ErrWrongBufferLength, "encoding []int64: wrong buffer length") { test.Fatal(err) }
_, err = DecodeI64Array[uint64](buffer[:])
if err != nil { test.Fatal(err) }
_, err = DecodeI64Array[uint64](buffer[:0])
if err != nil { test.Fatal(err) }
for _ = range largeNumberNTestRounds {
array := randInts[uint64](rand.Intn(16))
length, _ := I64ArraySize(array)
if length != 8 * len(array) { test.Fatalf("%d != %d", length, 8 * len(array)) }
err := EncodeI64Array[uint64](buffer[:length], array)
if err != nil { test.Fatal(err) }
decoded, err := DecodeI64Array[uint64](buffer[:length])
if err != nil { test.Fatal(err) }
if !slices.Equal(decoded, array) {
test.Fatalf("%v != %v", decoded, array)
}
}
}
func TestStringArray(test *testing.T) {
var buffer [8192]byte
err := EncodeStringArray[string](buffer[:], []string { "0", "4", "50", "19" })
if !errIs(err, ErrWrongBufferLength, "encoding []string: wrong buffer length") { test.Fatal(err) }
err = EncodeStringArray[string](buffer[:0], []string { "0", "4", "50", "19" })
if !errIs(err, ErrWrongBufferLength, "encoding []string: wrong buffer length") { test.Fatal(err) }
_, err = DecodeStringArray[string](buffer[:0])
if err != nil { test.Fatal(err) }
for _ = range largeNumberNTestRounds {
array := randStrings[string](rand.Intn(16), 16)
length, _ := StringArraySize(array)
// TODO test length
err := EncodeStringArray[string](buffer[:length], array)
if err != nil { test.Fatal(err) }
decoded, err := DecodeStringArray[string](buffer[:length])
if err != nil { test.Fatal(err) }
if !slices.Equal(decoded, array) {
test.Fatalf("%v != %v", decoded, array)
}
}
}
func randString(length int) string {
buffer := make([]byte, length)
for index := range buffer {
buffer[index] = randStringBytes[rand.Intn(len(randStringBytes))]
}
return string(buffer)
}
func randInts[T interface { ~uint | ~uint8 | ~uint16 | ~uint32 | ~uint64 }] (length int) []T {
buffer := make([]T, length)
for index := range buffer {
buffer[index] = T(rand.Int())
}
return buffer
}
func randStrings[T interface { ~string }] (length, maxItemLength int) []T {
buffer := make([]T, length)
for index := range buffer {
buffer[index] = T(randString(rand.Intn(maxItemLength)))
}
return buffer
}
func errIs(err error, wraps error, description string) bool {
return err != nil && (wraps == nil || errors.Is(err, wraps)) && err.Error() == description
}