From 126777bc019a54afb4ec51299f2cf9d2841698aa Mon Sep 17 00:00:00 2001
From: Pascal Rigaux <pixel@mandriva.com>
Date: Wed, 25 Apr 2007 12:26:16 +0000
Subject: re-sync after the big svn loss

---
 mdk-stage1/zlibsupport.c | 119 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 mdk-stage1/zlibsupport.c

(limited to 'mdk-stage1/zlibsupport.c')

diff --git a/mdk-stage1/zlibsupport.c b/mdk-stage1/zlibsupport.c
new file mode 100644
index 000000000..ecbe7a5ef
--- /dev/null
+++ b/mdk-stage1/zlibsupport.c
@@ -0,0 +1,119 @@
+/* Support for compressed modules.  Willy Tarreau <willy@meta-x.org>
+ * did the support for modutils, Andrey Borzenkov <arvidjaar@mail.ru>
+ * ported it to module-init-tools, and I said it was too ugly to live
+ * and rewrote it 8).
+ *
+ * (C) 2003 Rusty Russell, IBM Corporation.
+ */
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/mman.h>
+
+#include "zlibsupport.h"
+
+#ifdef CONFIG_USE_ZLIB
+#include <zlib.h>
+
+void *grab_contents(gzFile *gzfd, unsigned long *size)
+{
+	unsigned int max = 16384;
+	void *buffer = malloc(max);
+	int ret;
+
+	if (!buffer)
+		return NULL;
+
+	*size = 0;
+	while ((ret = gzread(gzfd, buffer + *size, max - *size)) > 0) {
+		*size += ret;
+		if (*size == max) {
+			void *p;
+
+			p = realloc(buffer, max *= 2);
+			if (!p)
+				goto out_err;
+
+			buffer = p;
+		}
+	}
+	if (ret < 0)
+		goto out_err;
+
+	return buffer;
+
+out_err:
+	free(buffer);
+	return NULL;
+}
+
+void *grab_fd(int fd, unsigned long *size)
+{
+	gzFile gzfd;
+
+	gzfd = gzdopen(fd, "rb");
+	if (!gzfd)
+		return NULL;
+
+	/* gzclose(gzfd) would close fd, which would drop locks.
+	   Don't blame zlib: POSIX locking semantics are so horribly
+	   broken that they should be ripped out. */
+	return grab_contents(gzfd, size);
+}
+
+/* gzopen handles uncompressed files transparently. */
+void *grab_file(const char *filename, unsigned long *size)
+{
+	gzFile gzfd;
+	void *buffer;
+
+	gzfd = gzopen(filename, "rb");
+	if (!gzfd)
+		return NULL;
+	buffer = grab_contents(gzfd, size);
+	gzclose(gzfd);
+	return buffer;
+}
+
+void release_file(void *data, unsigned long size)
+{
+	free(data);
+}
+#else /* ... !CONFIG_USE_ZLIB */
+
+void *grab_fd(int fd, unsigned long *size)
+{
+	struct stat st;
+	void *map;
+	int ret;
+
+	ret = fstat(fd, &st);
+	if (ret < 0)
+		return NULL;
+	*size = st.st_size;
+	map = mmap(0, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
+	if (map == MAP_FAILED)
+		map = NULL;
+	return map;
+}
+
+void *grab_file(const char *filename, unsigned long *size)
+{
+	int fd;
+	void *map;
+
+	fd = open(filename, O_RDONLY, 0);
+	if (fd < 0)
+		return NULL;
+	map = grab_fd(fd, size);
+	close(fd);
+	return map;
+}
+
+void release_file(void *data, unsigned long size)
+{
+	munmap(data, size);
+}
+#endif
-- 
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