github.com/gopherjs/gopherjs@v1.19.0-beta1.0.20240506212314-27071a8796e4/compiler/natives/src/golang.org/x/crypto/internal/subtle/aliasing.go (about)

     1  //go:build js
     2  // +build js
     3  
     4  package subtle
     5  
     6  // This file duplicated is these two locations:
     7  // - src/crypto/internal/subtle/aliasing.go
     8  // - src/golang.org/x/crypto/internal/subtle/aliasing.go
     9  // - src/golang.org/x/crypto/internal/alias/alias.go
    10  
    11  import "github.com/gopherjs/gopherjs/js"
    12  
    13  // AnyOverlap reports whether x and y share memory at any (not necessarily
    14  // corresponding) index. The memory beyond the slice length is ignored.
    15  func AnyOverlap(x, y []byte) bool {
    16  	// GopherJS: We can't rely on pointer arithmetic, so use GopherJS slice internals.
    17  	return len(x) > 0 && len(y) > 0 &&
    18  		js.InternalObject(x).Get("$array") == js.InternalObject(y).Get("$array") &&
    19  		js.InternalObject(x).Get("$offset").Int() <= js.InternalObject(y).Get("$offset").Int()+len(y)-1 &&
    20  		js.InternalObject(y).Get("$offset").Int() <= js.InternalObject(x).Get("$offset").Int()+len(x)-1
    21  }