github.com/wasilibs/wazerox@v0.0.0-20240124024944-4923be63ab5f/internal/testing/binaryencoding/limits.go (about)

     1  package binaryencoding
     2  
     3  import (
     4  	"github.com/wasilibs/wazerox/internal/leb128"
     5  )
     6  
     7  // EncodeLimitsType returns the `limitsType` (min, max) encoded in WebAssembly 1.0 (20191205) Binary Format.
     8  //
     9  // See https://www.w3.org/TR/2019/REC-wasm-core-1-20191205/#limits%E2%91%A6
    10  //
    11  // Extended in threads proposal: https://webassembly.github.io/threads/core/binary/types.html#limits
    12  func EncodeLimitsType(min uint32, max *uint32, shared bool) []byte {
    13  	var flag uint32
    14  	if max != nil {
    15  		flag = 0x01
    16  	}
    17  	if shared {
    18  		flag |= 0x02
    19  	}
    20  	ret := append(leb128.EncodeUint32(flag), leb128.EncodeUint32(min)...)
    21  	if max != nil {
    22  		ret = append(ret, leb128.EncodeUint32(*max)...)
    23  	}
    24  	return ret
    25  }