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gas/compress-debug.c

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+/* compress-debug.c - compress debug sections
+   Copyright 2010 Free Software Foundation, Inc.
+
+   This file is part of GAS, the GNU Assembler.
+
+   GAS 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, or (at your option)
+   any later version.
+
+   GAS 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 GAS; see the file COPYING.  If not, write to the Free
+   Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
+   02110-1301, USA.  */
+
+#include <stdio.h>
+
+#include "ansidecl.h"
+
+#include "config.h"
+#include "compress-debug.h"
+
+#ifdef HAVE_ZLIB_H
+#include <zlib.h>
+#endif
+
+/* Initialize the compression engine.  */
+
+struct z_stream_s *
+compress_init (void)
+{
+#ifndef HAVE_ZLIB_H
+  return NULL;
+#else
+  static struct z_stream_s strm;
+
+  strm.zalloc = NULL;
+  strm.zfree = NULL;
+  strm.opaque = NULL;
+  deflateInit (&strm, Z_DEFAULT_COMPRESSION);
+  return &strm;
+#endif /* HAVE_ZLIB_H */
+}
+
+/* Stream the contents of a frag to the compression engine.  Output
+   from the engine goes into the current frag on the obstack.  */
+
+int
+compress_data (struct z_stream_s *strm ATTRIBUTE_UNUSED,
+	       const char **next_in ATTRIBUTE_UNUSED,
+	       int *avail_in ATTRIBUTE_UNUSED,
+	       char **next_out ATTRIBUTE_UNUSED,
+	       int *avail_out ATTRIBUTE_UNUSED)
+{
+#ifndef HAVE_ZLIB_H
+  return -1;
+#else
+  int out_size = 0;
+  int x;
+
+  strm->next_in = (Bytef *) (*next_in);
+  strm->avail_in = *avail_in;
+  strm->next_out = (Bytef *) (*next_out);
+  strm->avail_out = *avail_out;
+
+  x = deflate (strm, Z_NO_FLUSH);
+  if (x != Z_OK)
+    return -1;
+
+  out_size = *avail_out - strm->avail_out;
+  *next_in = (char *) (strm->next_in);
+  *avail_in = strm->avail_in;
+  *next_out = (char *) (strm->next_out);
+  *avail_out = strm->avail_out;
+
+  return out_size;
+#endif /* HAVE_ZLIB_H */
+}
+
+/* Finish the compression and consume the remaining compressed output.
+   Returns -1 for error, 0 when done, 1 when more output buffer is
+   needed.  */
+
+int
+compress_finish (struct z_stream_s *strm ATTRIBUTE_UNUSED,
+		 char **next_out ATTRIBUTE_UNUSED,
+		 int *avail_out ATTRIBUTE_UNUSED,
+		 int *out_size ATTRIBUTE_UNUSED)
+{
+#ifndef HAVE_ZLIB_H
+  return -1;
+#else
+  int x;
+
+  strm->avail_in = 0;
+  strm->next_out = (Bytef *) (*next_out);
+  strm->avail_out = *avail_out;
+
+  x = deflate (strm, Z_FINISH);
+
+  *out_size = *avail_out - strm->avail_out;
+  *next_out = (char *) (strm->next_out);
+  *avail_out = strm->avail_out;
+
+  if (x == Z_STREAM_END)
+    {
+      deflateEnd (strm);
+      return 0;
+    }
+  if (strm->avail_out != 0)
+    return -1;
+  return 1;
+#endif /* HAVE_ZLIB_H */
+}

gas/compress-debug.h

@@ -0,0 +1,39 @@
+/* compress-debug.h - Header file for compressed debug sections.
+   Copyright 2010 Free Software Foundation, Inc.
+
+   This file is part of GAS, the GNU Assembler.
+
+   GAS 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, or (at your option)
+   any later version.
+
+   GAS 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 GAS; see the file COPYING.  If not, write to the Free
+   Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
+   02110-1301, USA.  */
+
+#ifndef COMPRESS_DEBUG_H
+#define COMPRESS_DEBUG_H
+
+struct z_stream_s;
+
+/* Initialize the compression engine.  */
+extern struct z_stream_s *
+compress_init (void);
+
+/* Stream the contents of a frag to the compression engine.  Output
+   from the engine goes into the current frag on the obstack.  */
+extern int
+compress_data (struct z_stream_s *, const char **, int *, char **, int *);
+
+/* Finish the compression and consume the remaining compressed output.  */
+extern int
+compress_finish (struct z_stream_s *, char **, int *, int *);
+
+#endif /* COMPRESS_DEBUG_H */