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name : ulid.go 
// Copyright 2016 The Oklog Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package ulid

import (
	"bufio"
	"bytes"
	"database/sql/driver"
	"encoding/binary"
	"errors"
	"io"
	"math"
	"math/bits"
	"math/rand"
	"time"
)

/*
An ULID is a 16 byte Universally Unique Lexicographically Sortable Identifier

	The components are encoded as 16 octets.
	Each component is encoded with the MSB first (network byte order).

	0                   1                   2                   3
	0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	|                      32_bit_uint_time_high                    |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	|     16_bit_uint_time_low      |       16_bit_uint_random      |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	|                       32_bit_uint_random                      |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	|                       32_bit_uint_random                      |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
type ULID [16]byte

var (
	// ErrDataSize is returned when parsing or unmarshaling ULIDs with the wrong
	// data size.
	ErrDataSize = errors.New("ulid: bad data size when unmarshaling")

	// ErrInvalidCharacters is returned when parsing or unmarshaling ULIDs with
	// invalid Base32 encodings.
	ErrInvalidCharacters = errors.New("ulid: bad data characters when unmarshaling")

	// ErrBufferSize is returned when marshalling ULIDs to a buffer of insufficient
	// size.
	ErrBufferSize = errors.New("ulid: bad buffer size when marshaling")

	// ErrBigTime is returned when constructing an ULID with a time that is larger
	// than MaxTime.
	ErrBigTime = errors.New("ulid: time too big")

	// ErrOverflow is returned when unmarshaling a ULID whose first character is
	// larger than 7, thereby exceeding the valid bit depth of 128.
	ErrOverflow = errors.New("ulid: overflow when unmarshaling")

	// ErrMonotonicOverflow is returned by a Monotonic entropy source when
	// incrementing the previous ULID's entropy bytes would result in overflow.
	ErrMonotonicOverflow = errors.New("ulid: monotonic entropy overflow")

	// ErrScanValue is returned when the value passed to scan cannot be unmarshaled
	// into the ULID.
	ErrScanValue = errors.New("ulid: source value must be a string or byte slice")
)

// New returns an ULID with the given Unix milliseconds timestamp and an
// optional entropy source. Use the Timestamp function to convert
// a time.Time to Unix milliseconds.
//
// ErrBigTime is returned when passing a timestamp bigger than MaxTime.
// Reading from the entropy source may also return an error.
func New(ms uint64, entropy io.Reader) (id ULID, err error) {
	if err = id.SetTime(ms); err != nil {
		return id, err
	}

	switch e := entropy.(type) {
	case nil:
		return id, err
	case *monotonic:
		err = e.MonotonicRead(ms, id[6:])
	default:
		_, err = io.ReadFull(e, id[6:])
	}

	return id, err
}

// MustNew is a convenience function equivalent to New that panics on failure
// instead of returning an error.
func MustNew(ms uint64, entropy io.Reader) ULID {
	id, err := New(ms, entropy)
	if err != nil {
		panic(err)
	}
	return id
}

// Parse parses an encoded ULID, returning an error in case of failure.
//
// ErrDataSize is returned if the len(ulid) is different from an encoded
// ULID's length. Invalid encodings produce undefined ULIDs. For a version that
// returns an error instead, see ParseStrict.
func Parse(ulid string) (id ULID, err error) {
	return id, parse([]byte(ulid), false, &id)
}

// ParseStrict parses an encoded ULID, returning an error in case of failure.
//
// It is like Parse, but additionally validates that the parsed ULID consists
// only of valid base32 characters. It is slightly slower than Parse.
//
// ErrDataSize is returned if the len(ulid) is different from an encoded
// ULID's length. Invalid encodings return ErrInvalidCharacters.
func ParseStrict(ulid string) (id ULID, err error) {
	return id, parse([]byte(ulid), true, &id)
}

func parse(v []byte, strict bool, id *ULID) error {
	// Check if a base32 encoded ULID is the right length.
	if len(v) != EncodedSize {
		return ErrDataSize
	}

	// Check if all the characters in a base32 encoded ULID are part of the
	// expected base32 character set.
	if strict &&
		(dec[v[0]] == 0xFF ||
			dec[v[1]] == 0xFF ||
			dec[v[2]] == 0xFF ||
			dec[v[3]] == 0xFF ||
			dec[v[4]] == 0xFF ||
			dec[v[5]] == 0xFF ||
			dec[v[6]] == 0xFF ||
			dec[v[7]] == 0xFF ||
			dec[v[8]] == 0xFF ||
			dec[v[9]] == 0xFF ||
			dec[v[10]] == 0xFF ||
			dec[v[11]] == 0xFF ||
			dec[v[12]] == 0xFF ||
			dec[v[13]] == 0xFF ||
			dec[v[14]] == 0xFF ||
			dec[v[15]] == 0xFF ||
			dec[v[16]] == 0xFF ||
			dec[v[17]] == 0xFF ||
			dec[v[18]] == 0xFF ||
			dec[v[19]] == 0xFF ||
			dec[v[20]] == 0xFF ||
			dec[v[21]] == 0xFF ||
			dec[v[22]] == 0xFF ||
			dec[v[23]] == 0xFF ||
			dec[v[24]] == 0xFF ||
			dec[v[25]] == 0xFF) {
		return ErrInvalidCharacters
	}

	// Check if the first character in a base32 encoded ULID will overflow. This
	// happens because the base32 representation encodes 130 bits, while the
	// ULID is only 128 bits.
	//
	// See https://github.com/oklog/ulid/issues/9 for details.
	if v[0] > '7' {
		return ErrOverflow
	}

	// Use an optimized unrolled loop (from https://github.com/RobThree/NUlid)
	// to decode a base32 ULID.

	// 6 bytes timestamp (48 bits)
	(*id)[0] = ((dec[v[0]] << 5) | dec[v[1]])
	(*id)[1] = ((dec[v[2]] << 3) | (dec[v[3]] >> 2))
	(*id)[2] = ((dec[v[3]] << 6) | (dec[v[4]] << 1) | (dec[v[5]] >> 4))
	(*id)[3] = ((dec[v[5]] << 4) | (dec[v[6]] >> 1))
	(*id)[4] = ((dec[v[6]] << 7) | (dec[v[7]] << 2) | (dec[v[8]] >> 3))
	(*id)[5] = ((dec[v[8]] << 5) | dec[v[9]])

	// 10 bytes of entropy (80 bits)
	(*id)[6] = ((dec[v[10]] << 3) | (dec[v[11]] >> 2))
	(*id)[7] = ((dec[v[11]] << 6) | (dec[v[12]] << 1) | (dec[v[13]] >> 4))
	(*id)[8] = ((dec[v[13]] << 4) | (dec[v[14]] >> 1))
	(*id)[9] = ((dec[v[14]] << 7) | (dec[v[15]] << 2) | (dec[v[16]] >> 3))
	(*id)[10] = ((dec[v[16]] << 5) | dec[v[17]])
	(*id)[11] = ((dec[v[18]] << 3) | dec[v[19]]>>2)
	(*id)[12] = ((dec[v[19]] << 6) | (dec[v[20]] << 1) | (dec[v[21]] >> 4))
	(*id)[13] = ((dec[v[21]] << 4) | (dec[v[22]] >> 1))
	(*id)[14] = ((dec[v[22]] << 7) | (dec[v[23]] << 2) | (dec[v[24]] >> 3))
	(*id)[15] = ((dec[v[24]] << 5) | dec[v[25]])

	return nil
}

// MustParse is a convenience function equivalent to Parse that panics on failure
// instead of returning an error.
func MustParse(ulid string) ULID {
	id, err := Parse(ulid)
	if err != nil {
		panic(err)
	}
	return id
}

// MustParseStrict is a convenience function equivalent to ParseStrict that
// panics on failure instead of returning an error.
func MustParseStrict(ulid string) ULID {
	id, err := ParseStrict(ulid)
	if err != nil {
		panic(err)
	}
	return id
}

// String returns a lexicographically sortable string encoded ULID
// (26 characters, non-standard base 32) e.g. 01AN4Z07BY79KA1307SR9X4MV3
// Format: tttttttttteeeeeeeeeeeeeeee where t is time and e is entropy
func (id ULID) String() string {
	ulid := make([]byte, EncodedSize)
	_ = id.MarshalTextTo(ulid)
	return string(ulid)
}

// MarshalBinary implements the encoding.BinaryMarshaler interface by
// returning the ULID as a byte slice.
func (id ULID) MarshalBinary() ([]byte, error) {
	ulid := make([]byte, len(id))
	return ulid, id.MarshalBinaryTo(ulid)
}

// MarshalBinaryTo writes the binary encoding of the ULID to the given buffer.
// ErrBufferSize is returned when the len(dst) != 16.
func (id ULID) MarshalBinaryTo(dst []byte) error {
	if len(dst) != len(id) {
		return ErrBufferSize
	}

	copy(dst, id[:])
	return nil
}

// UnmarshalBinary implements the encoding.BinaryUnmarshaler interface by
// copying the passed data and converting it to an ULID. ErrDataSize is
// returned if the data length is different from ULID length.
func (id *ULID) UnmarshalBinary(data []byte) error {
	if len(data) != len(*id) {
		return ErrDataSize
	}

	copy((*id)[:], data)
	return nil
}

// Encoding is the base 32 encoding alphabet used in ULID strings.
const Encoding = "0123456789ABCDEFGHJKMNPQRSTVWXYZ"

// MarshalText implements the encoding.TextMarshaler interface by
// returning the string encoded ULID.
func (id ULID) MarshalText() ([]byte, error) {
	ulid := make([]byte, EncodedSize)
	return ulid, id.MarshalTextTo(ulid)
}

// MarshalTextTo writes the ULID as a string to the given buffer.
// ErrBufferSize is returned when the len(dst) != 26.
func (id ULID) MarshalTextTo(dst []byte) error {
	// Optimized unrolled loop ahead.
	// From https://github.com/RobThree/NUlid

	if len(dst) != EncodedSize {
		return ErrBufferSize
	}

	// 10 byte timestamp
	dst[0] = Encoding[(id[0]&224)>>5]
	dst[1] = Encoding[id[0]&31]
	dst[2] = Encoding[(id[1]&248)>>3]
	dst[3] = Encoding[((id[1]&7)<<2)|((id[2]&192)>>6)]
	dst[4] = Encoding[(id[2]&62)>>1]
	dst[5] = Encoding[((id[2]&1)<<4)|((id[3]&240)>>4)]
	dst[6] = Encoding[((id[3]&15)<<1)|((id[4]&128)>>7)]
	dst[7] = Encoding[(id[4]&124)>>2]
	dst[8] = Encoding[((id[4]&3)<<3)|((id[5]&224)>>5)]
	dst[9] = Encoding[id[5]&31]

	// 16 bytes of entropy
	dst[10] = Encoding[(id[6]&248)>>3]
	dst[11] = Encoding[((id[6]&7)<<2)|((id[7]&192)>>6)]
	dst[12] = Encoding[(id[7]&62)>>1]
	dst[13] = Encoding[((id[7]&1)<<4)|((id[8]&240)>>4)]
	dst[14] = Encoding[((id[8]&15)<<1)|((id[9]&128)>>7)]
	dst[15] = Encoding[(id[9]&124)>>2]
	dst[16] = Encoding[((id[9]&3)<<3)|((id[10]&224)>>5)]
	dst[17] = Encoding[id[10]&31]
	dst[18] = Encoding[(id[11]&248)>>3]
	dst[19] = Encoding[((id[11]&7)<<2)|((id[12]&192)>>6)]
	dst[20] = Encoding[(id[12]&62)>>1]
	dst[21] = Encoding[((id[12]&1)<<4)|((id[13]&240)>>4)]
	dst[22] = Encoding[((id[13]&15)<<1)|((id[14]&128)>>7)]
	dst[23] = Encoding[(id[14]&124)>>2]
	dst[24] = Encoding[((id[14]&3)<<3)|((id[15]&224)>>5)]
	dst[25] = Encoding[id[15]&31]

	return nil
}

// Byte to index table for O(1) lookups when unmarshaling.
// We use 0xFF as sentinel value for invalid indexes.
var dec = [...]byte{
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x01,
	0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E,
	0x0F, 0x10, 0x11, 0xFF, 0x12, 0x13, 0xFF, 0x14, 0x15, 0xFF,
	0x16, 0x17, 0x18, 0x19, 0x1A, 0xFF, 0x1B, 0x1C, 0x1D, 0x1E,
	0x1F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x0A, 0x0B, 0x0C,
	0x0D, 0x0E, 0x0F, 0x10, 0x11, 0xFF, 0x12, 0x13, 0xFF, 0x14,
	0x15, 0xFF, 0x16, 0x17, 0x18, 0x19, 0x1A, 0xFF, 0x1B, 0x1C,
	0x1D, 0x1E, 0x1F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
}

// EncodedSize is the length of a text encoded ULID.
const EncodedSize = 26

// UnmarshalText implements the encoding.TextUnmarshaler interface by
// parsing the data as string encoded ULID.
//
// ErrDataSize is returned if the len(v) is different from an encoded
// ULID's length. Invalid encodings produce undefined ULIDs.
func (id *ULID) UnmarshalText(v []byte) error {
	return parse(v, false, id)
}

// Time returns the Unix time in milliseconds encoded in the ULID.
// Use the top level Time function to convert the returned value to
// a time.Time.
func (id ULID) Time() uint64 {
	return uint64(id[5]) | uint64(id[4])<<8 |
		uint64(id[3])<<16 | uint64(id[2])<<24 |
		uint64(id[1])<<32 | uint64(id[0])<<40
}

// maxTime is the maximum Unix time in milliseconds that can be
// represented in an ULID.
var maxTime = ULID{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}.Time()

// MaxTime returns the maximum Unix time in milliseconds that
// can be encoded in an ULID.
func MaxTime() uint64 { return maxTime }

// Now is a convenience function that returns the current
// UTC time in Unix milliseconds. Equivalent to:
//   Timestamp(time.Now().UTC())
func Now() uint64 { return Timestamp(time.Now().UTC()) }

// Timestamp converts a time.Time to Unix milliseconds.
//
// Because of the way ULID stores time, times from the year
// 10889 produces undefined results.
func Timestamp(t time.Time) uint64 {
	return uint64(t.Unix())*1000 +
		uint64(t.Nanosecond()/int(time.Millisecond))
}

// Time converts Unix milliseconds in the format
// returned by the Timestamp function to a time.Time.
func Time(ms uint64) time.Time {
	s := int64(ms / 1e3)
	ns := int64((ms % 1e3) * 1e6)
	return time.Unix(s, ns)
}

// SetTime sets the time component of the ULID to the given Unix time
// in milliseconds.
func (id *ULID) SetTime(ms uint64) error {
	if ms > maxTime {
		return ErrBigTime
	}

	(*id)[0] = byte(ms >> 40)
	(*id)[1] = byte(ms >> 32)
	(*id)[2] = byte(ms >> 24)
	(*id)[3] = byte(ms >> 16)
	(*id)[4] = byte(ms >> 8)
	(*id)[5] = byte(ms)

	return nil
}

// Entropy returns the entropy from the ULID.
func (id ULID) Entropy() []byte {
	e := make([]byte, 10)
	copy(e, id[6:])
	return e
}

// SetEntropy sets the ULID entropy to the passed byte slice.
// ErrDataSize is returned if len(e) != 10.
func (id *ULID) SetEntropy(e []byte) error {
	if len(e) != 10 {
		return ErrDataSize
	}

	copy((*id)[6:], e)
	return nil
}

// Compare returns an integer comparing id and other lexicographically.
// The result will be 0 if id==other, -1 if id < other, and +1 if id > other.
func (id ULID) Compare(other ULID) int {
	return bytes.Compare(id[:], other[:])
}

// Scan implements the sql.Scanner interface. It supports scanning
// a string or byte slice.
func (id *ULID) Scan(src interface{}) error {
	switch x := src.(type) {
	case nil:
		return nil
	case string:
		return id.UnmarshalText([]byte(x))
	case []byte:
		return id.UnmarshalBinary(x)
	}

	return ErrScanValue
}

// Value implements the sql/driver.Valuer interface. This returns the value
// represented as a byte slice. If instead a string is desirable, a wrapper
// type can be created that calls String().
//
//	// stringValuer wraps a ULID as a string-based driver.Valuer.
// 	type stringValuer ULID
//
//	func (id stringValuer) Value() (driver.Value, error) {
//		return ULID(id).String(), nil
//	}
//
//	// Example usage.
//	db.Exec("...", stringValuer(id))
func (id ULID) Value() (driver.Value, error) {
	return id.MarshalBinary()
}

// Monotonic returns an entropy source that is guaranteed to yield
// strictly increasing entropy bytes for the same ULID timestamp.
// On conflicts, the previous ULID entropy is incremented with a
// random number between 1 and `inc` (inclusive).
//
// The provided entropy source must actually yield random bytes or else
// monotonic reads are not guaranteed to terminate, since there isn't
// enough randomness to compute an increment number.
//
// When `inc == 0`, it'll be set to a secure default of `math.MaxUint32`.
// The lower the value of `inc`, the easier the next ULID within the
// same millisecond is to guess. If your code depends on ULIDs having
// secure entropy bytes, then don't go under this default unless you know
// what you're doing.
//
// The returned io.Reader isn't safe for concurrent use.
func Monotonic(entropy io.Reader, inc uint64) io.Reader {
	m := monotonic{
		Reader: bufio.NewReader(entropy),
		inc:    inc,
	}

	if m.inc == 0 {
		m.inc = math.MaxUint32
	}

	if rng, ok := entropy.(*rand.Rand); ok {
		m.rng = rng
	}

	return &m
}

type monotonic struct {
	io.Reader
	ms      uint64
	inc     uint64
	entropy uint80
	rand    [8]byte
	rng     *rand.Rand
}

func (m *monotonic) MonotonicRead(ms uint64, entropy []byte) (err error) {
	if !m.entropy.IsZero() && m.ms == ms {
		err = m.increment()
		m.entropy.AppendTo(entropy)
	} else if _, err = io.ReadFull(m.Reader, entropy); err == nil {
		m.ms = ms
		m.entropy.SetBytes(entropy)
	}
	return err
}

// increment the previous entropy number with a random number
// of up to m.inc (inclusive).
func (m *monotonic) increment() error {
	if inc, err := m.random(); err != nil {
		return err
	} else if m.entropy.Add(inc) {
		return ErrMonotonicOverflow
	}
	return nil
}

// random returns a uniform random value in [1, m.inc), reading entropy
// from m.Reader. When m.inc == 0 || m.inc == 1, it returns 1.
// Adapted from: https://golang.org/pkg/crypto/rand/#Int
func (m *monotonic) random() (inc uint64, err error) {
	if m.inc <= 1 {
		return 1, nil
	}

	// Fast path for using a underlying rand.Rand directly.
	if m.rng != nil {
		// Range: [1, m.inc)
		return 1 + uint64(m.rng.Int63n(int64(m.inc))), nil
	}

	// bitLen is the maximum bit length needed to encode a value < m.inc.
	bitLen := bits.Len64(m.inc)

	// byteLen is the maximum byte length needed to encode a value < m.inc.
	byteLen := uint(bitLen+7) / 8

	// msbitLen is the number of bits in the most significant byte of m.inc-1.
	msbitLen := uint(bitLen % 8)
	if msbitLen == 0 {
		msbitLen = 8
	}

	for inc == 0 || inc >= m.inc {
		if _, err = io.ReadFull(m.Reader, m.rand[:byteLen]); err != nil {
			return 0, err
		}

		// Clear bits in the first byte to increase the probability
		// that the candidate is < m.inc.
		m.rand[0] &= uint8(int(1<<msbitLen) - 1)

		// Convert the read bytes into an uint64 with byteLen
		// Optimized unrolled loop.
		switch byteLen {
		case 1:
			inc = uint64(m.rand[0])
		case 2:
			inc = uint64(binary.LittleEndian.Uint16(m.rand[:2]))
		case 3, 4:
			inc = uint64(binary.LittleEndian.Uint32(m.rand[:4]))
		case 5, 6, 7, 8:
			inc = uint64(binary.LittleEndian.Uint64(m.rand[:8]))
		}
	}

	// Range: [1, m.inc)
	return 1 + inc, nil
}

type uint80 struct {
	Hi uint16
	Lo uint64
}

func (u *uint80) SetBytes(bs []byte) {
	u.Hi = binary.BigEndian.Uint16(bs[:2])
	u.Lo = binary.BigEndian.Uint64(bs[2:])
}

func (u *uint80) AppendTo(bs []byte) {
	binary.BigEndian.PutUint16(bs[:2], u.Hi)
	binary.BigEndian.PutUint64(bs[2:], u.Lo)
}

func (u *uint80) Add(n uint64) (overflow bool) {
	lo, hi := u.Lo, u.Hi
	if u.Lo += n; u.Lo < lo {
		u.Hi++
	}
	return u.Hi < hi
}

func (u uint80) IsZero() bool {
	return u.Hi == 0 && u.Lo == 0
}
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services

Transforming Ideas into
Success

.01
Digital Marketing

We drive growth through data-driven strategies and cutting-edge techniques.

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.02
SEO

Improve your online visibility and rank higher on search engines with our expert SEO services.

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.03
Website Designing

We design websites that are not only visually stunning but also user-centric, ensuring seamless navigation and enhanced user experience.

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.04
App Development

Our apps are crafted to be intuitive, engaging, and functional, providing your users with an exceptional mobile experience.

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.05
Social Media Ads

Target the right audience with precision and creativity to maximize engagement and conversions.

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.06
Google Ads

Maximize ROI with precision-targeted campaigns on Google’s powerful ad platform.

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.07
Google My Business

Optimize your local presence with strategies that put your business on the map and attract more customers.

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.08
Graphic Designing

Our designs tell your brand’s story in a visually compelling way.

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.09
3D Videos

Bring your product to life with immersive and dynamic 3D explainer videos.

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about BEEGAZPACHO

creating special Things
For special brands

Join the ranks of successful brands by partnering with Beegazpacho

00+

Happy Customer

00+

Continents

Our vision is not just to be a service provider but to be your partner in growth. We see ourselves as an extension of your team, working tirelessly to ensure that your brand not only meets its goals but surpasses them.

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Our Recent Work

Crafted with Passion and Precision

Connect now


Web Design
Design, Development & Identity

Logo Design
Design, Development & Identity

Creative Brand design
Design, Development & Identity

Product Design Marketing
Design, Development & Identity

DIGITAL MARKETING
SEO
WEBSITE DESIGNING
APP DEVELOPMENT
SOCIAL MEDIA ADS
GOOGLE ADS
GOOGLE MY BUSINESS
GRAPHIC DESINING
3D VIDEOS
Client Stories

Hear It from Those Who Know Us Best

Our clients’ success stories speak volumes about our commitment to excellence. Don’t just take our word for it—hear directly from the brands we’ve partnered with. Their testimonials highlight our ability to bring visions to life and create a lasting impact on their businesses.

“Beegazpacho feels like an extension of our team. Their content marketing and social media expertise have elevated our brand. They listen, adapt, and always deliver on time. We look forward to continuing this partnership.”

— Sarah Williams

Head of Marketing, GreenPlanet Apparel

“Beegazpacho’s data-driven strategies helped us improve our online ads, optimize our website, and enhance branding. We’ve seen great ROI and increased visibility. Their professionalism is unmatched.”

— Arvind Shah

CEO, InnovateTech Solutions

“Partnering with Beegazpacho has been a game-changer for our brand. Their creative ad campaigns and SEO services have boosted our online presence and significantly increased leads and sales. We couldn’t ask for a better partner!”

— Rina Kapoor

Marketing Director, Luxury Home Interiors

“Beegazpacho feels like an extension of our team. Their content marketing and social media expertise have elevated our brand. They listen, adapt, and always deliver on time. We look forward to continuing this partnership.”

— Sarah Williams

Head of Marketing, GreenPlanet Apparel

“Beegazpacho’s data-driven strategies helped us improve our online ads, optimize our website, and enhance branding. We’ve seen great ROI and increased visibility. Their professionalism is unmatched.”

— Arvind Shah

CEO, InnovateTech Solutions

“Partnering with Beegazpacho has been a game-changer for our brand. Their creative ad campaigns and SEO services have boosted our online presence and significantly increased leads and sales. We couldn’t ask for a better partner!”

— Rina Kapoor

Marketing Director, Luxury Home Interiors