guardrail buffer sizes

Signed-off-by: garyschulte <[email protected]>

gnark/gnark-jni/gnark-eip-196.go

@@ -50,7 +50,7 @@ func eip196altbn128G1Add(javaInputBuf, javaOutputBuf, javaErrorBuf *C.char, cInp
  outputLen := (*int)(unsafe.Pointer(cOutputLen))
 
  // Convert error C pointers to Go slices
- errorBuf := castErrorBufferEIP196(javaErrorBuf, *errorLen)
+ errorBuf := castErrorBufferEIP196(javaErrorBuf, errorLen)
 
  if (inputLen > 2*EIP196PreallocateForG1) {
  // trunc if input too long
@@ -108,7 +108,7 @@ func eip196altbn128G1Mul(javaInputBuf, javaOutputBuf, javaErrorBuf *C.char, cInp
  outputLen := (*int)(unsafe.Pointer(cOutputLen))
 
  // Convert error C pointers to Go slices
- errorBuf := castErrorBufferEIP196(javaErrorBuf, *errorLen)
+ errorBuf := castErrorBufferEIP196(javaErrorBuf, errorLen)
 
  if inputLen < EIP196PreallocateForG1 {
  // if we do not have complete input, return 0
@@ -160,10 +160,10 @@ func eip196altbn128Pairing(javaInputBuf, javaOutputBuf, javaErrorBuf *C.char, cI
  outputLen := (*int)(unsafe.Pointer(cOutputLen))
 
  // Convert error C pointers to Go slices
- output := castBufferEIP196(javaOutputBuf, *outputLen)
+ output := castBufferEIP196(javaOutputBuf, outputLen)
 
  // Convert error C pointers to Go slices
- errorBuf := castErrorBufferEIP196(javaErrorBuf, *errorLen)
+ errorBuf := castErrorBufferEIP196(javaErrorBuf, errorLen)
 
  *outputLen = 32
 
@@ -312,17 +312,17 @@ func castBufferToSliceEIP196(buf unsafe.Pointer, length int) []byte {
  return slice
 }
 
-func castBufferEIP196(javaOutputBuf *C.char, length int) []byte {
- bufSize := length
- if bufSize < EIP196PreallocateForResult {
+func castBufferEIP196(javaOutputBuf *C.char, length *int) []byte {
+ bufSize := *length
+ if bufSize != EIP196PreallocateForResult {
  bufSize = EIP196PreallocateForResult
  }
  return (*[EIP196PreallocateForResult]byte)(unsafe.Pointer(javaOutputBuf))[:bufSize:bufSize]
 }
 
-func castErrorBufferEIP196(javaOutputBuf *C.char, length int) []byte {
- bufSize := length
- if bufSize < EIP196PreallocateForError {
+func castErrorBufferEIP196(javaOutputBuf *C.char, length *int) []byte {
+ bufSize := *length
+ if bufSize != EIP196PreallocateForError {
  bufSize = EIP196PreallocateForError
  }
  return (*[EIP196PreallocateForError]byte)(unsafe.Pointer(javaOutputBuf))[:bufSize:bufSize]