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-rw-r--r--Utilities/cmlibarchive/libarchive/archive_read_support_filter_grzip.c121
1 files changed, 121 insertions, 0 deletions
diff --git a/Utilities/cmlibarchive/libarchive/archive_read_support_filter_grzip.c b/Utilities/cmlibarchive/libarchive/archive_read_support_filter_grzip.c
new file mode 100644
index 000000000..84c86aeb4
--- /dev/null
+++ b/Utilities/cmlibarchive/libarchive/archive_read_support_filter_grzip.c
@@ -0,0 +1,121 @@
+/*-
+ * Copyright (c) 2012 Michihiro NAKAJIMA
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "archive_platform.h"
+
+__FBSDID("$FreeBSD$");
+
+
+#ifdef HAVE_ERRNO_H
+#include <errno.h>
+#endif
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#include "archive.h"
+#include "archive_private.h"
+#include "archive_read_private.h"
+
+static const unsigned char grzip_magic[] = {
+ 0x47, 0x52, 0x5a, 0x69, 0x70, 0x49, 0x49, 0x00,
+ 0x02, 0x04, 0x3a, 0x29 };
+
+static int grzip_bidder_bid(struct archive_read_filter_bidder *,
+ struct archive_read_filter *);
+static int grzip_bidder_init(struct archive_read_filter *);
+
+
+static int
+grzip_reader_free(struct archive_read_filter_bidder *self)
+{
+ (void)self; /* UNUSED */
+ return (ARCHIVE_OK);
+}
+
+int
+archive_read_support_filter_grzip(struct archive *_a)
+{
+ struct archive_read *a = (struct archive_read *)_a;
+ struct archive_read_filter_bidder *reader;
+
+ archive_check_magic(_a, ARCHIVE_READ_MAGIC,
+ ARCHIVE_STATE_NEW, "archive_read_support_filter_grzip");
+
+ if (__archive_read_get_bidder(a, &reader) != ARCHIVE_OK)
+ return (ARCHIVE_FATAL);
+
+ reader->data = NULL;
+ reader->bid = grzip_bidder_bid;
+ reader->init = grzip_bidder_init;
+ reader->options = NULL;
+ reader->free = grzip_reader_free;
+ /* This filter always uses an external program. */
+ archive_set_error(_a, ARCHIVE_ERRNO_MISC,
+ "Using external grzip program for grzip decompression");
+ return (ARCHIVE_WARN);
+}
+
+/*
+ * Bidder just verifies the header and returns the number of verified bits.
+ */
+static int
+grzip_bidder_bid(struct archive_read_filter_bidder *self,
+ struct archive_read_filter *filter)
+{
+ const unsigned char *p;
+ ssize_t avail;
+
+ (void)self; /* UNUSED */
+
+ p = __archive_read_filter_ahead(filter, sizeof(grzip_magic), &avail);
+ if (p == NULL || avail == 0)
+ return (0);
+
+ if (memcmp(p, grzip_magic, sizeof(grzip_magic)))
+ return (0);
+
+ return (sizeof(grzip_magic) * 8);
+}
+
+static int
+grzip_bidder_init(struct archive_read_filter *self)
+{
+ int r;
+
+ r = __archive_read_program(self, "grzip -d");
+ /* Note: We set the format here even if __archive_read_program()
+ * above fails. We do, after all, know what the format is
+ * even if we weren't able to read it. */
+ self->code = ARCHIVE_FILTER_GRZIP;
+ self->name = "grzip";
+ return (r);
+}