path: root/stream.go

package salticidae

// #include <stdlib.h>
// #include "salticidae/stream.h"
// uint16_t _salti_htole16(uint16_t x) { return htole16(x); }
// uint32_t _salti_htole32(uint32_t x) { return htole32(x); }
// uint64_t _salti_htole64(uint64_t x) { return htole64(x); }
//
// uint16_t _salti_letoh16(uint16_t x) { return le16toh(x); }
// uint32_t _salti_letoh32(uint32_t x) { return le32toh(x); }
// uint64_t _salti_letoh64(uint64_t x) { return le64toh(x); }
//
// uint16_t _salti_htobe16(uint16_t x) { return htobe16(x); }
// uint32_t _salti_htobe32(uint32_t x) { return htobe32(x); }
// uint64_t _salti_htobe64(uint64_t x) { return htobe64(x); }
//
// uint16_t _salti_betoh16(uint16_t x) { return be16toh(x); }
// uint32_t _salti_betoh32(uint32_t x) { return be32toh(x); }
// uint64_t _salti_betoh64(uint64_t x) { return be64toh(x); }
//
import "C"
import "runtime"

type CByteArray = *C.bytearray_t
// The C pointer to a ByteArray object.
type byteArray struct { inner CByteArray }
// Array of binary data.
type ByteArray = *byteArray

func ByteArrayFromC(ptr CByteArray) ByteArray {
    return &byteArray{ inner: ptr }
}

func byteArraySetFinalizer(res ByteArray) {
    if res != nil {
        runtime.SetFinalizer(res, func(self ByteArray) { self.free() })
    }
}

// Create an empty byte array (with zero contained bytes).
func NewByteArray() ByteArray {
    res := ByteArrayFromC(C.bytearray_new())
    byteArraySetFinalizer(res)
    return res
}

func (self ByteArray) free() { C.bytearray_free(self.inner) }

// Create a byte array by taking out all data from src. Notice this is a
// zero-copy operation that consumes and invalidates the data in src ("move"
// semantics) so that no more operation should be done to src after this
// function call. Also notice unlike copying, the entire DataStream buffer is
// moved (including the possibily consumed part).
func NewByteArrayMovedFromDataStream(src DataStream) (res ByteArray) {
    res = ByteArrayFromC(C.bytearray_new_moved_from_datastream(src.inner))
    byteArraySetFinalizer(res)
    return
}

// Create a byte array by copying the remaining data from src.
func NewByteArrayCopiedFromDataStream(src DataStream) (res ByteArray) {
    res = ByteArrayFromC(C.bytearray_new_copied_from_datastream(src.inner))
    byteArraySetFinalizer(res)
    return
}

func NewByteArrayFromHex(hex string) (res ByteArray) {
    c_str := C.CString(hex)
    res = ByteArrayFromC(C.bytearray_new_from_hex(c_str))
    C.free(rawptr_t(c_str))
    byteArraySetFinalizer(res)
    return
}

func NewByteArrayFromBytes(bytes []byte) (res ByteArray) {
    size := len(bytes)
    if size > 0 {
        base := (*C.uint8_t)(&bytes[0])
        res = ByteArrayFromC(C.bytearray_new_from_bytes(base, C.size_t(size)))
    } else {
        res = ByteArrayFromC(C.bytearray_new())
    }
    byteArraySetFinalizer(res)
    return
}

// The C pointer to a DataStream object.
type CDataStream = *C.datastream_t
type dataStream struct {
    inner CDataStream
    attached map[uintptr]interface{}
}

// Stream of binary data.
type DataStream = *dataStream

func DataStreamFromC(ptr CDataStream) DataStream {
    return &dataStream{
        inner: ptr,
        attached: make(map[uintptr]interface{}),
    }
}

func dataStreamSetFinalizer(res DataStream) {
    if res != nil {
        runtime.SetFinalizer(res, func(self DataStream) { self.free() })
    }
}

// Create an empty DataStream.
func NewDataStream() DataStream {
    res := DataStreamFromC(C.datastream_new())
    dataStreamSetFinalizer(res)
    return res
}

// Create a DataStream with data copied from bytes.
func NewDataStreamFromBytes(bytes []byte) (res DataStream) {
    size := len(bytes)
    if size > 0 {
        base := (*C.uint8_t)(&bytes[0])
        res = DataStreamFromC(C.datastream_new_from_bytes(base, C.size_t(size)))
    } else {
        res = DataStreamFromC(C.datastream_new())
    }
    dataStreamSetFinalizer(res)
    return
}

// Create a DataStream with content moved from a ByteArray.
func NewDataStreamMovedFromByteArray(bytes ByteArray) (res DataStream) {
    res = DataStreamFromC(C.datastream_new_moved_from_bytearray(bytes.inner))
    dataStreamSetFinalizer(res)
    return
}

// Create a DataStream with content copied from a ByteArray.
func NewDataStreamFromByteArray(bytes ByteArray) (res DataStream) {
    res = DataStreamFromC(C.datastream_new_from_bytearray(bytes.inner))
    dataStreamSetFinalizer(res)
    return
}

func (self DataStream) free() { C.datastream_free(self.inner) }

func (self DataStream) attach(ptr rawptr_t, obj interface{}) { self.attached[uintptr(ptr)] = obj }
func (self DataStream) detach(ptr rawptr_t) { delete(self.attached, uintptr(ptr)) }

// Make a copy of the object.
func (self DataStream) Copy() (res DataStream) {
    res = DataStreamFromC(C.datastream_copy(self.inner))
    dataStreamSetFinalizer(res)
    return
}

// TODO: datastream_data

// Empty the DataStream.
func (self DataStream) Clear() { C.datastream_clear(self.inner) }

func (self DataStream) Size() int { return int(C.datastream_size(self.inner)) }

// Write a uint8 integer to the stream (no byte order conversion).
func (self DataStream) PutU8(v uint8) bool { return bool(C.datastream_put_u8(self.inner, C.uint8_t(v))) }
// Write a uint16 integer to the stream (no byte order conversion).
func (self DataStream) PutU16(v uint16) bool { return bool(C.datastream_put_u16(self.inner, C.uint16_t(v))) }
// Write a uint32 integer to the stream (no byte order conversion).
func (self DataStream) PutU32(v uint32) bool { return bool(C.datastream_put_u32(self.inner, C.uint32_t(v))) }
// Write a uint64 integer to the stream (no byte order conversion).
func (self DataStream) PutU64(v uint64) bool { return bool(C.datastream_put_u64(self.inner, C.uint64_t(v))) }

// Write an int8 integer to the stream (no byte order conversion).
func (self DataStream) PutI8(v int8) bool { return bool(C.datastream_put_i8(self.inner, C.int8_t(v))) }
// Write an int16 integer to the stream (no byte order conversion).
func (self DataStream) PutI16(v int16) bool { return bool(C.datastream_put_i16(self.inner, C.int16_t(v))) }
// Write an int32 integer to the stream (no byte order conversion).
func (self DataStream) PutI32(v int32) bool { return bool(C.datastream_put_i32(self.inner, C.int32_t(v))) }
// Write an int64 integer to the stream (no byte order conversion).
func (self DataStream) PutI64(v int32) bool { return bool(C.datastream_put_i64(self.inner, C.int64_t(v))) }

// Write arbitrary bytes to the stream.
func (self DataStream) PutData(bytes []byte) bool {
    size := len(bytes)
    if size > 0 {
        base := (*C.uint8_t)(&bytes[0])
        return bool(C.datastream_put_data(self.inner, base, C.size_t(size)))
    } else { return true }
}

// Parse a uint8 integer by consuming the stream (no byte order conversion).
func (self DataStream) GetU8(succ *bool) uint8 { return uint8(C.datastream_get_u8(self.inner, (*C.bool)(succ))) }
// Parse a uint16 integer by consuming the stream (no byte order conversion).
func (self DataStream) GetU16(succ *bool) uint16 { return uint16(C.datastream_get_u16(self.inner, (*C.bool)(succ))) }
// Parse a uint32 integer by consuming the stream (no byte order conversion).
func (self DataStream) GetU32(succ *bool) uint32 { return uint32(C.datastream_get_u32(self.inner, (*C.bool)(succ))) }
// Parse a uint64 integer by consuming the stream (no byte order conversion).
func (self DataStream) GetU64(succ *bool) uint64 { return uint64(C.datastream_get_u64(self.inner, (*C.bool)(succ))) }

// Parse an int8 integer by consuming the stream (no byte order conversion).
func (self DataStream) GetI8(succ *bool) int8 { return int8(C.datastream_get_i8(self.inner, (*C.bool)(succ))) }
// Parse an int16 integer by consuming the stream (no byte order conversion).
func (self DataStream) GetI16(succ *bool) int16 { return int16(C.datastream_get_i16(self.inner, (*C.bool)(succ))) }
// Parse an int32 integer by consuming the stream (no byte order conversion).
func (self DataStream) GetI32(succ *bool) int32 { return int32(C.datastream_get_i32(self.inner, (*C.bool)(succ))) }
// Parse an int64 integer by consuming the stream (no byte order conversion).
func (self DataStream) GetI64(succ *bool) int64 { return int64(C.datastream_get_i64(self.inner, (*C.bool)(succ))) }

func ToLittleEndianU16(x uint16) uint16 { return uint16(C._salti_htole16(C.uint16_t(x))); }
func ToLittleEndianU32(x uint32) uint32 { return uint32(C._salti_htole32(C.