fix FileFd::Size bitswap on big-endian architectures

gzip only gives us 32bit of size, storing it in a 64bit container and
doing a 32bit flip on it has therefore unintended results.
So we just go with a exact size container and let the flipping be handled
by eglibc provided le32toh removing our #ifdef machinery.

Closes: 745866

diff --git a/apt-pkg/contrib/fileutl.cc b/apt-pkg/contrib/fileutl.cc
index de73a7f..b77c7ff 100644 (file)
--- a/apt-pkg/contrib/fileutl.cc
+++ b/apt-pkg/contrib/fileutl.cc
@@ -58,13 +58,10 @@
        #include <bzlib.h>
 #endif
 #ifdef HAVE_LZMA
-       #include <stdint.h>
        #include <lzma.h>
 #endif
-
-#ifdef WORDS_BIGENDIAN
-#include <inttypes.h>
-#endif
+#include <endian.h>
+#include <stdint.h>
 
 #include <apti18n.h>
                                                                        /*}}}*/
@@ -1880,19 +1877,13 @@ unsigned long long FileFd::Size()
          FileFdErrno("lseek","Unable to seek to end of gzipped file");
          return 0;
        }
-       size = 0;
+       uint32_t size = 0;
        if (read(iFd, &size, 4) != 4)
        {
          FileFdErrno("read","Unable to read original size of gzipped file");
          return 0;
        }
-
-#ifdef WORDS_BIGENDIAN
-       uint32_t tmp_size = size;
-       uint8_t const * const p = (uint8_t const * const) &tmp_size;
-       tmp_size = (p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0];
-       size = tmp_size;
-#endif
+       size = le32toh(size);
 
        if (lseek(iFd, oldPos, SEEK_SET) < 0)
        {