1 files changed, 22 insertions, 12 deletions
diff --git a/Lib/gzip.py b/Lib/gzip.py
index ba2149e..e6b8193 100644
--- a/Lib/gzip.py
+++ b/Lib/gzip.py
@@ -16,18 +16,6 @@ FTEXT, FHCRC, FEXTRA, FNAME, FCOMMENT = 1, 2, 4, 8, 16
 
 READ, WRITE = 1, 2
 
-def U32(i):
-    """Return i as an unsigned integer, assuming it fits in 32 bits.
-    If it's >= 2GB when viewed as a 32-bit unsigned int, return a long.
-    """
-    if i < 0:
-        i += 1 << 32
-    return i
-
-def LOWU32(i):
-    """Return the low-order 32 bits, as a non-negative int"""
-    return i & 0xFFFFFFFF
-
 def write32u(output, value):
     # The L format writes the bit pattern correctly whether signed
     # or unsigned.
@@ -348,6 +336,28 @@ class GzipFile(io.BufferedIOBase):
         self.offset += size
         return chunk
 
+    def read1(self, size=-1):
+        self._check_closed()
+        if self.mode != READ:
+            import errno
+            raise IOError(errno.EBADF, "read1() on write-only GzipFile object")
+
+        if self.extrasize <= 0 and self.fileobj is None:
+            return b''
+
+        try:
+            self._read()
+        except EOFError:
+            pass
+        if size < 0 or size > self.extrasize:
+            size = self.extrasize
+
+        offset = self.offset - self.extrastart
+        chunk = self.extrabuf[offset: offset + size]
+        self.extrasize -= size
+        self.offset += size
+        return chunk
+
     def peek(self, n):
         if self.mode != READ:
             import errno