bzip2/lzma: centralize format detection
H. Peter Anvin [Thu, 8 Jan 2009 23:14:17 +0000 (15:14 -0800)]
Centralize the compression format detection to a common routine in the
lib directory, and use it for both initramfs and initrd.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

include/linux/decompress/generic.h
init/do_mounts_rd.c
init/initramfs.c
lib/Makefile
lib/decompress.c [new file with mode: 0644]

index f847f51..6dfb856 100644 (file)
@@ -26,5 +26,8 @@ typedef int (*decompress_fn) (unsigned char *inbuf, int len,
  *fill should be called (repeatedly...) to read data, at most IOBUF_SIZE
  */
 
+/* Utility routine to detect the decompression method */
+decompress_fn decompress_method(const unsigned char *inbuf, int len,
+                               const char **name);
 
 #endif
index 9c9d7db..a06ed4f 100644 (file)
@@ -12,9 +12,6 @@
 
 #include <linux/decompress/generic.h>
 
-#include <linux/decompress/bunzip2.h>
-#include <linux/decompress/unlzma.h>
-#include <linux/decompress/inflate.h>
 
 int __initdata rd_prompt = 1;/* 1 = prompt for RAM disk, 0 = don't prompt */
 
@@ -49,24 +46,6 @@ static int __init crd_load(int in_fd, int out_fd, decompress_fn deco);
  *     cramfs
  *     gzip
  */
-static const struct compress_format {
-       unsigned char magic[2];
-       const char *name;
-       decompress_fn decompressor;
-} compressed_formats[] = {
-#ifdef CONFIG_RD_GZIP
-       { {037, 0213}, "gzip", gunzip },
-       { {037, 0236}, "gzip", gunzip },
-#endif
-#ifdef CONFIG_RD_BZIP2
-       { {0x42, 0x5a}, "bzip2", bunzip2 },
-#endif
-#ifdef CONFIG_RD_LZMA
-       { {0x5d, 0x00}, "lzma", unlzma },
-#endif
-       { {0, 0}, NULL, NULL }
-};
-
 static int __init
 identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor)
 {
@@ -77,7 +56,7 @@ identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor)
        struct cramfs_super *cramfsb;
        int nblocks = -1;
        unsigned char *buf;
-       const struct compress_format *cf;
+       const char *compress_name;
 
        buf = kmalloc(size, GFP_KERNEL);
        if (!buf)
@@ -95,15 +74,12 @@ identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor)
        sys_lseek(fd, start_block * BLOCK_SIZE, 0);
        sys_read(fd, buf, size);
 
-       for (cf = compressed_formats; cf->decompressor; cf++) {
-               if (buf[0] == cf->magic[0] && buf[1] == cf->magic[1]) {
-                       printk(KERN_NOTICE
-                              "RAMDISK: %s image found at block %d\n",
-                              cf->name, start_block);
-                       *decompressor = cf->decompressor;
-                       nblocks = 0;
-                       goto done;
-               }
+       *decompressor = decompress_method(buf, size, &compress_name);
+       if (*decompressor) {
+               printk(KERN_NOTICE "RAMDISK: %s image found at block %d\n",
+                      compress_name, start_block);
+               nblocks = 0;
+               goto done;
        }
 
        /* romfs is at block zero too */
index a3ba91c..2f42984 100644 (file)
@@ -416,13 +416,13 @@ static int __init flush_buffer(void *bufv, unsigned len)
 
 static unsigned my_inptr;   /* index of next byte to be processed in inbuf */
 
-#include <linux/decompress/bunzip2.h>
-#include <linux/decompress/unlzma.h>
-#include <linux/decompress/inflate.h>
+#include <linux/decompress/generic.h>
 
 static char * __init unpack_to_rootfs(char *buf, unsigned len, int check_only)
 {
        int written;
+       decompress_fn decompress;
+
        dry_run = check_only;
        header_buf = kmalloc(110, GFP_KERNEL);
        symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL);
@@ -450,35 +450,10 @@ static char * __init unpack_to_rootfs(char *buf, unsigned len, int check_only)
                        continue;
                }
                this_header = 0;
-#ifdef CONFIG_RD_GZIP
-               if (!gunzip(buf, len, NULL, flush_buffer, NULL,
-                           &my_inptr, error) &&
-                   message == NULL)
-                       goto ok;
-#endif
-
-#ifdef CONFIG_RD_BZIP2
-               message = NULL; /* Zero out message, or else cpio will
-                                  think an error has already occured */
-               if (!bunzip2(buf, len, NULL, flush_buffer, NULL,
-                            &my_inptr, error) &&
-                   message == NULL) {
-                       goto ok;
-               }
-#endif
-
-#ifdef CONFIG_RD_LZMA
-               message = NULL; /* Zero out message, or else cpio will
-                                  think an error has already occured */
-               if (!unlzma(buf, len, NULL, flush_buffer, NULL,
-                           &my_inptr, error) &&
-                   message == NULL) {
-                       goto ok;
-               }
-#endif
-#if defined CONFIG_RD_GZIP || defined CONFIG_RD_BZIP2 || defined CONFIG_RD_LZMA
-ok:
-#endif
+               decompress = decompress_method(buf, len, NULL);
+               if (decompress)
+                       decompress(buf, len, NULL, flush_buffer, NULL,
+                                  &my_inptr, error);
                if (state != Reset)
                        error("junk in compressed archive");
                this_header = saved_offset + my_inptr;
index d9ac5a4..790de7c 100644 (file)
@@ -11,7 +11,8 @@ lib-y := ctype.o string.o vsprintf.o cmdline.o \
         rbtree.o radix-tree.o dump_stack.o \
         idr.o int_sqrt.o extable.o prio_tree.o \
         sha1.o irq_regs.o reciprocal_div.o argv_split.o \
-        proportions.o prio_heap.o ratelimit.o show_mem.o is_single_threaded.o
+        proportions.o prio_heap.o ratelimit.o show_mem.o \
+        is_single_threaded.o decompress.o
 
 lib-$(CONFIG_MMU) += ioremap.o
 lib-$(CONFIG_SMP) += cpumask.o
@@ -65,9 +66,9 @@ obj-$(CONFIG_REED_SOLOMON) += reed_solomon/
 obj-$(CONFIG_LZO_COMPRESS) += lzo/
 obj-$(CONFIG_LZO_DECOMPRESS) += lzo/
 
-obj-$(CONFIG_DECOMPRESS_GZIP) += decompress_inflate.o
-obj-$(CONFIG_DECOMPRESS_BZIP2) += decompress_bunzip2.o
-obj-$(CONFIG_DECOMPRESS_LZMA) += decompress_unlzma.o
+lib-$(CONFIG_DECOMPRESS_GZIP) += decompress_inflate.o
+lib-$(CONFIG_DECOMPRESS_BZIP2) += decompress_bunzip2.o
+lib-$(CONFIG_DECOMPRESS_LZMA) += decompress_unlzma.o
 
 obj-$(CONFIG_TEXTSEARCH) += textsearch.o
 obj-$(CONFIG_TEXTSEARCH_KMP) += ts_kmp.o
diff --git a/lib/decompress.c b/lib/decompress.c
new file mode 100644 (file)
index 0000000..edac55c
--- /dev/null
@@ -0,0 +1,50 @@
+/*
+ * decompress.c
+ *
+ * Detect the decompression method based on magic number
+ */
+
+#include <linux/decompress/generic.h>
+
+#include <linux/decompress/bunzip2.h>
+#include <linux/decompress/unlzma.h>
+#include <linux/decompress/inflate.h>
+
+#include <linux/types.h>
+#include <linux/string.h>
+
+static const struct compress_format {
+       unsigned char magic[2];
+       const char *name;
+       decompress_fn decompressor;
+} compressed_formats[] = {
+#ifdef CONFIG_DECOMPRESS_GZIP
+       { {037, 0213}, "gzip", gunzip },
+       { {037, 0236}, "gzip", gunzip },
+#endif
+#ifdef CONFIG_DECOMPRESS_BZIP2
+       { {0x42, 0x5a}, "bzip2", bunzip2 },
+#endif
+#ifdef CONFIG_DECOMPRESS_LZMA
+       { {0x5d, 0x00}, "lzma", unlzma },
+#endif
+       { {0, 0}, NULL, NULL }
+};
+
+decompress_fn decompress_method(const unsigned char *inbuf, int len,
+                               const char **name)
+{
+       const struct compress_format *cf;
+
+       if (len < 2)
+               return NULL;    /* Need at least this much... */
+
+       for (cf = compressed_formats; cf->decompressor; cf++) {
+               if (!memcmp(inbuf, cf->magic, 2))
+                       break;
+
+       }
+       if (name)
+               *name = cf->name;
+       return cf->decompressor;
+}