Allow compression algorithm specification

grub-core/boot/decompressor/minilib.c

@@ -0,0 +1,99 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2010  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/types.h>
+#include <grub/misc.h>
+#include <grub/decompressor.h>
+
+void *
+memset (void *s, int c, grub_size_t len)
+{
+  grub_uint8_t *ptr;
+  for (ptr = s; len; ptr++, len--)
+    *ptr = c;
+  return s;
+}
+
+void *
+grub_memmove (void *dest, const void *src, grub_size_t n)
+{
+  char *d = (char *) dest;
+  const char *s = (const char *) src;
+
+  if (d < s)
+    while (n--)
+      *d++ = *s++;
+  else
+    {
+      d += n;
+      s += n;
+
+      while (n--)
+	*--d = *--s;
+    }
+
+  return dest;
+}
+
+int
+grub_memcmp (const void *s1, const void *s2, grub_size_t n)
+{
+  const char *t1 = s1;
+  const char *t2 = s2;
+
+  while (n--)
+    {
+      if (*t1 != *t2)
+	return (int) *t1 - (int) *t2;
+
+      t1++;
+      t2++;
+    }
+
+  return 0;
+}
+
+int memcmp (const void *s1, const void *s2, grub_size_t n)
+  __attribute__ ((alias ("grub_memcmp")));
+
+void *memmove (void *dest, const void *src, grub_size_t n)
+  __attribute__ ((alias ("grub_memmove")));
+
+void *memcpy (void *dest, const void *src, grub_size_t n)
+  __attribute__ ((alias ("grub_memmove")));
+
+void *grub_decompressor_scratch;
+
+void
+find_scratch (void *src, void *dst, unsigned long srcsize,
+	      unsigned long dstsize)
+{
+#ifdef _mips
+  /* Decoding from ROM.  */
+  if (((grub_addr_t) src & 0x10000000))
+    {
+      grub_decompressor_scratch = (char *) dst + dstsize;
+      return;
+    }
+#endif
+  if ((char *) src + srcsize > (char *) dst + dstsize)
+    grub_decompressor_scratch = (char *) src + srcsize;
+  else
+    grub_decompressor_scratch = (char *) dst + dstsize;
+  return;
+}