Allow negative integer for crc32 and adler32 calculations

Author: rhpvorderman

src/isal/isal_zlib.pyx

@@ -86,7 +86,7 @@ if ISAL_DEF_MAX_HIST_BITS > zlib.MAX_WBITS:
                      "Please contact the developers.")
 
 
-def adler32(data, unsigned int value = 1):
+def adler32(data, long long value = 1):
     """
     Computes an Adler-32 checksum of *data*. Returns the checksum as unsigned
     32-bit integer.
@@ -105,7 +105,7 @@ def adler32(data, unsigned int value = 1):
     finally:
         PyBuffer_Release(buffer)
 
-def crc32(data, unsigned int value = 0):
+def crc32(data, long long value = 0):
     """
     Computes a CRC-32 checksum of *data*. Returns the checksum as unsigned
     32-bit integer.

tests/test_isal.py

@@ -35,8 +35,9 @@
 DATA_SIZES = [2**i for i in range(3, 20)]
 # 100 seeds generated with random.randint(0, 2**32-1)
 SEEDS_FILE = DATA_DIR / "seeds.txt"
-# Create seeds 0, 1 and 20 seeds from the seeds file.
-SEEDS = [0, 1] + [int(seed) for seed in SEEDS_FILE.read_text().splitlines()]
+# Create seeds -3, -20, 0, 1 and 20 seeds from the seeds file.
+SEEDS = [-3, -20, 0, 1] + [
+    int(seed) for seed in SEEDS_FILE.read_text().splitlines()]
 
 # Wbits for ZLIB compression, GZIP compression, and RAW compressed streams
 WBITS_RANGE = list(range(9, 16)) + list(range(25, 32)) + list(range(-15, -8))