1 files changed, 62 insertions, 11 deletions

diff --git a/lib/zlib_inflate/inffast.c b/lib/zlib_inflate/inffast.c
index 8550b0c05d00..2c13ecc5bb2c 100644
--- a/lib/zlib_inflate/inffast.c
+++ b/lib/zlib_inflate/inffast.c
@@ -21,12 +21,31 @@
    - Pentium III (Anderson)
    - M68060 (Nikl)
  */
+union uu {
+        unsigned short us;
+        unsigned char b[2];
+};
+
+/* Endian independed version */
+static inline unsigned short
+get_unaligned16(const unsigned short *p)
+{
+        union uu  mm;
+        unsigned char *b = (unsigned char *)p;
+
+        mm.b[0] = b[0];
+        mm.b[1] = b[1];
+        return mm.us;
+}
+
 #ifdef POSTINC
 #  define OFF 0
 #  define PUP(a) *(a)++
+#  define UP_UNALIGNED(a) get_unaligned16((a)++)
 #else
 #  define OFF 1
 #  define PUP(a) *++(a)
+#  define UP_UNALIGNED(a) get_unaligned16(++(a))
 #endif
 
 /*
@@ -239,18 +258,50 @@ void inflate_fast(z_streamp strm, unsigned start)
                     }
                 }
                 else {
+                    unsigned short *sout;
+                    unsigned long loops;
+
                     from = out - dist;          /* copy direct from output */
-                    do {                        /* minimum length is three */
-                        PUP(out) = PUP(from);
-                        PUP(out) = PUP(from);
-                        PUP(out) = PUP(from);
-                        len -= 3;
-                    } while (len > 2);
-                    if (len) {
-                        PUP(out) = PUP(from);
-                        if (len > 1)
-                            PUP(out) = PUP(from);
-                    }
+                    /* minimum length is three */
+                    /* Align out addr */
+                    if (!((long)(out - 1 + OFF) & 1)) {
+                        PUP(out) = PUP(from);
+                        len--;
+                    }
+                    sout = (unsigned short *)(out - OFF);
+                    if (dist > 2) {
+                        unsigned short *sfrom;
+
+                        sfrom = (unsigned short *)(from - OFF);
+                        loops = len >> 1;
+                        do
+#ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
+                            PUP(sout) = PUP(sfrom);
+#else
+                            PUP(sout) = UP_UNALIGNED(sfrom);
+#endif
+                        while (--loops);
+                        out = (unsigned char *)sout + OFF;
+                        from = (unsigned char *)sfrom + OFF;
+                    } else { /* dist == 1 or dist == 2 */
+                        unsigned short pat16;
+
+                        pat16 = *(sout-1+OFF);
+                        if (dist == 1) {
+                                union uu mm;
+                                /* copy one char pattern to both bytes */
+                                mm.us = pat16;
+                                mm.b[0] = mm.b[1];
+                                pat16 = mm.us;
+                        }
+                        loops = len >> 1;
+                        do
+                            PUP(sout) = pat16;
+                        while (--loops);
+                        out = (unsigned char *)sout + OFF;
+                    }
+                    if (len & 1)
+                        PUP(out) = PUP(from);
                 }
             }
             else if ((op & 64) == 0) {          /* 2nd level distance code */