feat: encoding/binary (for encoding/base64)

[r3v4s]

Description

contract with import encoding/base64 is failing when gnokey maketx addpkg
'base64' imports binary but there is non in stdlibs/*

Additional

@thehowl I think this is related to my previous issue #808 and yours #814

[thehowl]

If you're adding bigEndian I think you should also add littleEndian?

Do you have an application where you need these specifically?

[schollz]

Do you have an application where you need these specifically?

These functions are nice-to-have so that Gno smart contracts could support encoding/decoding of various file formats. For example, I wanted both of these for a .wav file format encoder (https://github.com/schollz/gno/blob/bytebeat/examples/gno.land/p/demo/audio/riff/riff.gno) for developing web3 audio applications (like audio nfts).

If you're adding bigEndian I think you should also add littleEndian?

I'd agree it would be nice to have the package incorporate as much as possible. I've found that this works well: master...schollz:gno:feat/binary-encoding. I won't make another PR for it, but perhaps that can be followed to including the encoding/binary needed for encoding/base64

[jaekwon]

Let's please add little endian too.
If any stdlib functions are modified, please note the changes with XXX as well.
Thank you!

[jaekwon]

pre-approving but please add little endian too.

[r3v4s]

Let's please add little endian too. If any stdlib functions are modified, please note the changes with XXX as well. Thank you!

thanks to your review.
I've add little endian too with test cases

[moul]

And update this file please: https://github.com/gnolang/gno/blob/master/gnovm/docs/go-gno-compatibility.md#stdlibs

[r3v4s]

And update this file please: https://github.com/gnolang/gno/blob/master/gnovm/docs/go-gno-compatibility.md#stdlibs

Should I change in this PR? or create new one??

[moul]

In the same please, it's to take the habit of doing it. Thank you.

[moul]

Please, run make fmt to fix the last small details.

diff --git a/gnovm/stdlibs/encoding/binary/binary.gno b/gnovm/stdlibs/encoding/binary/binary.gno
index 7e99d14e..08f7b3f2 100644
--- a/gnovm/stdlibs/encoding/binary/binary.gno
+++ b/gnovm/stdlibs/encoding/binary/binary.gno
@@ -200,4 +200,4 @@ func (bigEndian) AppendUint64(b []byte, v uint64) []byte {
 
 func (bigEndian) String() string { return "BigEndian" }
 
-func (bigEndian) GoString() string { return "binary.BigEndian" }
\ No newline at end of file
+func (bigEndian) GoString() string { return "binary.BigEndian" }
diff --git a/gnovm/stdlibs/encoding/binary/binary_test.gno b/gnovm/stdlibs/encoding/binary/binary_test.gno
index 05b6c369..5407eb50 100644
--- a/gnovm/stdlibs/encoding/binary/binary_test.gno
+++ b/gnovm/stdlibs/encoding/binary/binary_test.gno
@@ -3,7 +3,6 @@ package binary
 import (
    "bytes"
    "encoding/binary"
-
    "testing"
 )
 
@@ -187,4 +186,4 @@ func TestbigEndianAppendUint64(t *testing.T) {
    if !bytes.Equal(b, []byte{0xfe, 0x14, 0xf5, 0xe9, 0x07, 0xd0, 0x03, 0xe8, 0x0b, 0xb8, 0x07, 0xd0, 0xd0, 0x07, 0xe9, 0xf5}) {
        t.Fatal("bigEndian.AppendUint64 failed")
    }
-}
\ No newline at end of file
+}