Replace usages of CRC32 in std-lib

src/gzip/gzip.cr

@@ -1,5 +1,5 @@
 require "flate"
-require "crc32"
+require "digest/crc32"
 
 # The Gzip module contains readers and writers of gzip format compressed
 # data, as specified in [RFC 1952](https://www.ietf.org/rfc/rfc1952.txt).

src/gzip/reader.cr

@@ -43,7 +43,7 @@ class Gzip::Reader < IO
   # Creates a new reader from the given *io*.
   def initialize(@io : IO, @sync_close = false)
     # CRC32 of written data
-    @crc32 = CRC32.initial
+    @crc32 = Digest::CRC32.initial
 
     # Total size of the original (uncompressed) input data modulo 2^32.
     @isize = 0_u32
@@ -101,7 +101,7 @@ class Gzip::Reader < IO
         end
 
         # Reset checksum and total size for next entry
-        @crc32 = CRC32.initial
+        @crc32 = Digest::CRC32.initial
         @isize = 0_u32
 
         # Check if another header with data comes
@@ -115,7 +115,7 @@ class Gzip::Reader < IO
         end
       else
         # Update CRC32 and total data size
-        @crc32 = CRC32.update(slice[0, read_bytes], @crc32)
+        @crc32 = Digest::CRC32.update(slice[0, read_bytes], @crc32)
 
         # Using wrapping addition here because isize is only 32 bits wide but
         # uncompressed data size can be bigger.

src/gzip/writer.cr

@@ -37,7 +37,7 @@ class Gzip::Writer < IO
   # Creates a new writer to the given *io*.
   def initialize(@io : IO, @level = Gzip::DEFAULT_COMPRESSION, @sync_close = false)
     # CRC32 of written data
-    @crc32 = CRC32.initial
+    @crc32 = Digest::CRC32.initial
 
     # Total size of the original (uncompressed) input data modulo 2^32.
     @isize = 0
@@ -77,7 +77,7 @@ class Gzip::Writer < IO
     flate_io.write(slice)
 
     # Update CRC32 and total data size
-    @crc32 = CRC32.update(slice, @crc32)
+    @crc32 = Digest::CRC32.update(slice, @crc32)
 
     # Using wrapping addition here because isize is only 32 bits wide but
     # uncompressed data size can be bigger.

src/zip/zip.cr

@@ -1,5 +1,5 @@
 require "flate"
-require "crc32"
+require "digest/crc32"
 require "./*"
 
 # The Zip module contains readers and writers of the zip