Fix abi.decint

ethereum/abi.py

@@ -4,7 +4,7 @@
 from ethereum import utils
 from rlp.utils import decode_hex, encode_hex
 from ethereum.utils import encode_int, zpad, big_endian_to_int, is_numeric, is_string, ceil32
-from ethereum.utils import isnumeric
+from ethereum.utils import isnumeric, TT256, TT255
 import ast
 
 
@@ -145,35 +145,38 @@ class ValueOutOfBounds(EncodingError):
     pass
 
 
-# Decode an integer
-def decint(n):
+# Decode an unsigned/signed integer
+def decint(n, signed=False):
     if isinstance(n, str):
         n = utils.to_string(n)
-    if is_numeric(n) and n < 2**256 and n >= -2**255:
+
+    if is_numeric(n):
+        min, max = (-TT255,TT255-1) if signed else (0,TT256-1) 
+        if n > max or n < min:
+            raise EncodingError("Number out of range: %r" % n)
         return n
-    elif is_numeric(n):
-        raise EncodingError("Number out of range: %r" % n)
-    elif is_string(n) and len(n) == 40:
-        return big_endian_to_int(decode_hex(n))
-    elif is_string(n) and len(n) <= 32:
-        return big_endian_to_int(n)
-    elif is_string(n) and len(n) > 32:
-        raise EncodingError("String too long: %r" % n)
+    elif is_string(n):
+        if len(n) == 40:
+            n = decode_hex(n)
+        if len(n) > 32:
+            raise EncodingError("String too long: %r" % n)
+
+        i = big_endian_to_int(n)
+        return (i - TT256) if signed and i >= TT255 else i
     elif n is True:
         return 1
     elif n is False or n is None:
         return 0
     else:
         raise EncodingError("Cannot encode integer: %r" % n)
 
-
 # Encodes a base datum
 def encode_single(typ, arg):
     base, sub, _ = typ
     # Unsigned integers: uint<sz>
     if base == 'uint':
         sub = int(sub)
-        i = decint(arg)
+        i = decint(arg, False)
 
         if not 0 <= i < 2**sub:
             raise ValueOutOfBounds(repr(arg))
@@ -185,7 +188,7 @@ def encode_single(typ, arg):
     # Signed integers: int<sz>
     elif base == 'int':
         sub = int(sub)
-        i = decint(arg)
+        i = decint(arg, True)
         if not -2**(sub - 1) <= i < 2**(sub - 1):
             raise ValueOutOfBounds(repr(arg))
         return zpad(encode_int(i % 2**sub), 32)

ethereum/tests/test_abi.py

@@ -22,6 +22,7 @@ def test_abi_encode_signed_int():
 
 def test_abi_encode_single_int():
     assert abi.encode_single(['int', '256', []], -2**255) == (b'\x80'+b'\x00'*31)
+    assert abi.encode_single(['int', '256', []], (b'\x80'+b'\x00'*31)) == (b'\x80'+b'\x00'*31)
 
     assert abi.encode_single(['int', '8', []], -128) == zpad(b'\x80', 32)
     with pytest.raises(abi.ValueOutOfBounds):

ethereum/tests/test_contracts.py

@@ -1190,7 +1190,7 @@ def test_types():
 
 
 ecrecover_code = """
-def test_ecrecover(h, v, r, s):
+def test_ecrecover(h:uint256, v:uint256, r:uint256, s:uint256):
     return(ecrecover(h, v, r, s))
 """