aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorPeter Korsgaard <jacmet@sunsite.dk>2009-11-19 11:37:51 +0100
committerWolfgang Denk <wd@denx.de>2009-12-05 01:30:23 +0100
commit20dde48bcadd856c86a91d5463831a10be46db83 (patch)
tree0fd8ab398d563f05aa1eec30fae6e4493af91928
parent3eb90bad651fab39cffba750ec4421a9c01d60e7 (diff)
add lzop decompression support
Add lzop decompression support to the existing lzo bitstream handling (think gzip versus zlib), and support it for uImage decompression if CONFIG_LZO is enabled. Lzop doesn't compress as good as gzip (~10% worse), but decompression is very fast (~0.7s faster here on a slow ppc). The lzop decompression code is based on Albin Tonnerre's recent ARM Linux lzo support patch. Cc: albin.tonnerre@free-electrons.com Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
-rw-r--r--common/cmd_bootm.c22
-rw-r--r--common/image.c1
-rw-r--r--include/image.h1
-rw-r--r--include/linux/lzo.h4
-rw-r--r--lib_generic/lzo/lzo1x_decompress.c87
5 files changed, 115 insertions, 0 deletions
diff --git a/common/cmd_bootm.c b/common/cmd_bootm.c
index 8f8359856..aa85fafab 100644
--- a/common/cmd_bootm.c
+++ b/common/cmd_bootm.c
@@ -57,6 +57,10 @@
#include <lzma/LzmaTools.h>
#endif /* CONFIG_LZMA */
+#ifdef CONFIG_LZO
+#include <linux/lzo.h>
+#endif /* CONFIG_LZO */
+
DECLARE_GLOBAL_DATA_PTR;
extern int gunzip (void *dst, int dstlen, unsigned char *src, unsigned long *lenp);
@@ -405,6 +409,24 @@ static int bootm_load_os(image_info_t os, ulong *load_end, int boot_progress)
*load_end = load + unc_len;
break;
#endif /* CONFIG_LZMA */
+#ifdef CONFIG_LZO
+ case IH_COMP_LZO:
+ printf (" Uncompressing %s ... ", type_name);
+
+ int ret = lzop_decompress((const unsigned char *)image_start,
+ image_len, (unsigned char *)load,
+ &unc_len);
+ if (ret != LZO_E_OK) {
+ printf ("LZO: uncompress or overwrite error %d "
+ "- must RESET board to recover\n", ret);
+ if (boot_progress)
+ show_boot_progress (-6);
+ return BOOTM_ERR_RESET;
+ }
+
+ *load_end = load + unc_len;
+ break;
+#endif /* CONFIG_LZO */
default:
printf ("Unimplemented compression type %d\n", comp);
return BOOTM_ERR_UNIMPLEMENTED;
diff --git a/common/image.c b/common/image.c
index 6eaf41eb1..5cc3ab49d 100644
--- a/common/image.c
+++ b/common/image.c
@@ -148,6 +148,7 @@ static table_entry_t uimage_comp[] = {
{ IH_COMP_BZIP2, "bzip2", "bzip2 compressed", },
{ IH_COMP_GZIP, "gzip", "gzip compressed", },
{ IH_COMP_LZMA, "lzma", "lzma compressed", },
+ { IH_COMP_LZO, "lzo", "lzo compressed", },
{ -1, "", "", },
};
diff --git a/include/image.h b/include/image.h
index 5a424e6a9..cc38eae39 100644
--- a/include/image.h
+++ b/include/image.h
@@ -164,6 +164,7 @@
#define IH_COMP_GZIP 1 /* gzip Compression Used */
#define IH_COMP_BZIP2 2 /* bzip2 Compression Used */
#define IH_COMP_LZMA 3 /* lzma Compression Used */
+#define IH_COMP_LZO 4 /* lzo Compression Used */
#define IH_MAGIC 0x27051956 /* Image Magic Number */
#define IH_NMLEN 32 /* Image Name Length */
diff --git a/include/linux/lzo.h b/include/linux/lzo.h
index d793497ec..88687faba 100644
--- a/include/linux/lzo.h
+++ b/include/linux/lzo.h
@@ -27,6 +27,10 @@ int lzo1x_1_compress(const unsigned char *src, size_t src_len,
int lzo1x_decompress_safe(const unsigned char *src, size_t src_len,
unsigned char *dst, size_t *dst_len);
+/* decompress lzop format */
+int lzop_decompress(const unsigned char *src, size_t src_len,
+ unsigned char *dst, size_t *dst_len);
+
/*
* Return values (< 0 = Error)
*/
diff --git a/lib_generic/lzo/lzo1x_decompress.c b/lib_generic/lzo/lzo1x_decompress.c
index 2780e118a..09bdc8f6c 100644
--- a/lib_generic/lzo/lzo1x_decompress.c
+++ b/lib_generic/lzo/lzo1x_decompress.c
@@ -24,6 +24,93 @@
#define COPY4(dst, src) \
put_unaligned(get_unaligned((const u32 *)(src)), (u32 *)(dst))
+static const unsigned char lzop_magic[] = {
+ 0x89, 0x4c, 0x5a, 0x4f, 0x00, 0x0d, 0x0a, 0x1a, 0x0a
+};
+
+#define HEADER_HAS_FILTER 0x00000800L
+
+static inline const unsigned char *parse_header(const unsigned char *src)
+{
+ u8 level = 0;
+ u16 version;
+ int i;
+
+ /* read magic: 9 first bytes */
+ for (i = 0; i < ARRAY_SIZE(lzop_magic); i++) {
+ if (*src++ != lzop_magic[i])
+ return NULL;
+ }
+ /* get version (2bytes), skip library version (2),
+ * 'need to be extracted' version (2) and
+ * method (1) */
+ version = get_unaligned_be16(src);
+ src += 7;
+ if (version >= 0x0940)
+ level = *src++;
+ if (get_unaligned_be32(src) & HEADER_HAS_FILTER)
+ src += 4; /* filter info */
+
+ /* skip flags, mode and mtime_low */
+ src += 12;
+ if (version >= 0x0940)
+ src += 4; /* skip mtime_high */
+
+ i = *src++;
+ /* don't care about the file name, and skip checksum */
+ src += i + 4;
+
+ return src;
+}
+
+int lzop_decompress(const unsigned char *src, size_t src_len,
+ unsigned char *dst, size_t *dst_len)
+{
+ unsigned char *start = dst;
+ const unsigned char *send = src + src_len;
+ u32 slen, dlen;
+ size_t tmp;
+ int r;
+
+ src = parse_header(src);
+ if (!src)
+ return LZO_E_ERROR;
+
+ while (src < send) {
+ /* read uncompressed block size */
+ dlen = get_unaligned_be32(src);
+ src += 4;
+
+ /* exit if last block */
+ if (dlen == 0) {
+ *dst_len = dst - start;
+ return LZO_E_OK;
+ }
+
+ /* read compressed block size, and skip block checksum info */
+ slen = get_unaligned_be32(src);
+ src += 8;
+
+ if (slen <= 0 || slen > dlen)
+ return LZO_E_ERROR;
+
+ /* decompress */
+ tmp = dlen;
+ r = lzo1x_decompress_safe((u8 *) src, slen, dst, &tmp);
+
+ if (r != LZO_E_OK)
+ return r;
+
+ if (dlen != tmp)
+ return LZO_E_ERROR;
+
+ src += slen;
+ dst += dlen;
+ }
+
+ return LZO_E_INPUT_OVERRUN;
+}
+
int lzo1x_decompress_safe(const unsigned char *in, size_t in_len,
unsigned char *out, size_t *out_len)
{