1 files changed, 87 insertions, 0 deletions
diff --git a/libstore/do-bunzip2.c b/libstore/do-bunzip2.c
new file mode 100644
index 00000000..d2bc9da1
--- /dev/null
+++ b/libstore/do-bunzip2.c
@@ -0,0 +1,87 @@
+/* bunzip2 decompression
+
+   Copyright (C) 2014 Free Software Foundation, Inc.
+   Written by Ignazio Sgalmuzzo <ignaker@gmail.com>
+
+   This file is part of the GNU Hurd.
+
+   The GNU Hurd 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 2, or (at
+   your option) any later version.
+
+   The GNU Hurd 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 this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */
+
+#include <bzlib.h>
+
+/* I/O interface */
+extern int (*unzip_read) (char *buf, size_t maxread);
+extern void (*unzip_write) (const char *buf, size_t nwrite);
+extern void (*unzip_read_error) (void);
+extern void (*unzip_error) (const char *msg);
+
+/* bzip2 doesn't require window sliding. Just for buffering. */
+#define INBUFSIZ	0x1000
+#define OUTBUFSIZ	0x1000
+
+static char inbuf[INBUFSIZ];
+static char outbuf[OUTBUFSIZ];
+
+#ifdef SMALL_BZIP2
+#define SMALL_MODE 1
+#else
+#define SMALL_MODE 0
+#endif
+
+void
+do_bunzip2 (void)
+{
+  int result;
+  bz_stream strm;
+
+  strm.bzalloc = NULL;
+  strm.bzfree = NULL;
+  strm.opaque = NULL;
+
+  strm.avail_in  = 0;
+  strm.next_out = outbuf;
+  strm.avail_out = OUTBUFSIZ;
+
+  result = BZ2_bzDecompressInit (&strm, 0, SMALL_MODE);
+
+  while (result == BZ_OK)
+  {
+    if (strm.avail_in == 0)
+    {
+      strm.next_in = inbuf;
+      strm.avail_in  = (*unzip_read)(strm.next_in, INBUFSIZ);
+
+      if (strm.avail_in == 0)
+        break;
+    }
+
+    result = BZ2_bzDecompress (&strm);
+
+    if ((result != BZ_OK) && (result != BZ_STREAM_END))
+      break;
+
+    if ((strm.avail_out == 0) || (result == BZ_STREAM_END))
+    {
+      (*unzip_write) (outbuf, OUTBUFSIZ - strm.avail_out);
+      strm.next_out = outbuf;
+      strm.avail_out = OUTBUFSIZ;
+    }
+  }
+
+  BZ2_bzDecompressEnd (&strm);
+
+  if (result != BZ_STREAM_END)
+    (*unzip_error) (NULL);
+}