diff -r 75a146a657d9 Lib/test/test_zipimport.py
--- a/Lib/test/test_zipimport.py	Sat Nov 24 18:14:12 2012 +0100
+++ b/Lib/test/test_zipimport.py	Sun Nov 25 16:18:30 2012 +0100
@@ -196,6 +196,7 @@
             for name, (mtime, data) in files.items():
                 zinfo = ZipInfo(name, time.localtime(mtime))
                 zinfo.compress_type = self.compression
+                zinfo.comment = b"spam"
                 z.writestr(zinfo, data)
             z.close()
 
@@ -245,6 +246,7 @@
             for name, (mtime, data) in files.items():
                 zinfo = ZipInfo(name, time.localtime(mtime))
                 zinfo.compress_type = self.compression
+                zinfo.comment = b"eggs"
                 z.writestr(zinfo, data)
             z.close()
 
diff -r 75a146a657d9 Modules/zipimport.c
--- a/Modules/zipimport.c	Sat Nov 24 18:14:12 2012 +0100
+++ b/Modules/zipimport.c	Sun Nov 25 16:18:30 2012 +0100
@@ -861,7 +861,7 @@
     Py_ssize_t file_offset, header_position, header_offset;
     long l, count;
     Py_ssize_t i;
-    char name[MAXPATHLEN + 5];
+    char name[MAXPATHLEN + 5], dummy[8];
     PyObject *nameobj = NULL;
     char *p, endof_central_dir[22];
     Py_ssize_t arc_offset;  /* Absolute offset to start of the zip-archive. */
@@ -905,17 +905,20 @@
 
     /* Start of Central Directory */
     count = 0;
+    if (fseek(fp, header_offset, 0) == -1)
+        goto file_error;
     for (;;) {
         PyObject *t;
         int err;
 
-        if (fseek(fp, header_offset, 0) == -1)  /* Start of file header */
-            goto fseek_error;
+        /* Start of file header */
         l = PyMarshal_ReadLongFromFile(fp);
         if (l != 0x02014B50)
             break;              /* Bad: Central Dir File Header */
-        if (fseek(fp, header_offset + 8, 0) == -1)
-            goto fseek_error;
+
+        if (fread(dummy, 1, 4, fp) != 4) /* dummy read for unused fields */
+            goto file_error;
+
         flags = (unsigned short)PyMarshal_ReadShortFromFile(fp);
         compress = PyMarshal_ReadShortFromFile(fp);
         time = PyMarshal_ReadShortFromFile(fp);
@@ -924,11 +927,11 @@
         data_size = PyMarshal_ReadLongFromFile(fp);
         file_size = PyMarshal_ReadLongFromFile(fp);
         name_size = PyMarshal_ReadShortFromFile(fp);
-        header_size = 46 + name_size +
+        header_size = name_size +
            PyMarshal_ReadShortFromFile(fp) +
            PyMarshal_ReadShortFromFile(fp);
-        if (fseek(fp, header_offset + 42, 0) == -1)
-            goto fseek_error;
+        if (fread(dummy, 1, 8, fp) != 8) /* dummy read for unused fields */
+            goto file_error;
         file_offset = PyMarshal_ReadLongFromFile(fp) + arc_offset;
         if (name_size > MAXPATHLEN)
             name_size = MAXPATHLEN;
@@ -941,7 +944,8 @@
             p++;
         }
         *p = 0;         /* Add terminating null byte */
-        header_offset += header_size;
+        for (; i < header_size; i++)
+            (void)getc(fp);
 
         bootstrap = 0;
         if (flags & 0x0800)
@@ -988,7 +992,7 @@
         PySys_FormatStderr("# zipimport: found %ld names in %R\n",
                            count, archive);
     return files;
-fseek_error:
+file_error:
     fclose(fp);
     Py_XDECREF(files);
     Py_XDECREF(nameobj);