add ability to handle compressed images to imxtract

imxtract currently can not handle compressed images. This patch adds
handling for bzip2 and zip compression. In both cases, a destination
address has to be specified for extraction.

Signed-off-by: Wolfgang Wegner <w.wegner@astro-kom.de>

common/cmd_ximg.c

@@ -31,8 +31,17 @@
 #include <common.h>
 #include <command.h>
 #include <image.h>
+#include <watchdog.h>
+#if defined(CONFIG_BZIP2)
+#include <bzlib.h>
+#endif
 #include <asm/byteorder.h>
 
+#ifndef CONFIG_SYS_XIMG_LEN
+/* use 8MByte as default max gunzip size */
+#define CONFIG_SYS_XIMG_LEN	0x800000
+#endif
+
 int
 do_imgextract(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 {
@@ -50,6 +59,8 @@ do_imgextract(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 	const void	*fit_data;
 	size_t		fit_len;
 #endif
+	uint		unc_len = CONFIG_SYS_XIMG_LEN;
+	uint8_t		comp;
 
 	verify = getenv_yesno ("verify");
 
@@ -92,8 +103,10 @@ do_imgextract(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 			return 1;
 		}
 
-		if (image_get_comp (hdr) != IH_COMP_NONE) {
-			printf("Wrong Compression Type for %s command\n",
+		comp = image_get_comp (hdr);
+		if ((comp != IH_COMP_NONE) && (argc < 4)) {
+			printf("Must specify load address for %s command "
+					"with compressed image\n",
 					cmdtp->name);
 			return 1;
 		}
@@ -138,9 +151,11 @@ do_imgextract(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 			return 1;
 		}
 
-		if (fit_image_check_comp (fit_hdr, noffset, IH_COMP_NONE)) {
-			printf("Wrong Compression Type for %s command\n",
-					cmdtp->name);
+		if (fit_image_check_comp (fit_hdr, noffset, IH_COMP_NONE)
+		    && (argc < 4)) {
+			printf("Must specify load address for %s command "
+				"with compressed image\n",
+				cmdtp->name);
 			return 1;
 		}
 
@@ -153,11 +168,18 @@ do_imgextract(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 		}
 
 		/* get subimage data address and length */
-		if (fit_image_get_data (fit_hdr, noffset, &fit_data, &fit_len)) {
+		if (fit_image_get_data (fit_hdr, noffset,
+					&fit_data, &fit_len)) {
 			puts ("Could not find script subimage data\n");
 			return 1;
 		}
 
+		if (fit_image_get_comp (fit_hdr, noffset, &comp)) {
+			puts ("Could not find script subimage "
+				"compression type\n");
+			return 1;
+		}
+
 		data = (ulong)fit_data;
 		len = (ulong)fit_len;
 		break;
@@ -168,7 +190,63 @@ do_imgextract(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 	}
 
 	if (argc > 3) {
-		memcpy((char *) dest, (char *) data, len);
+		switch (comp) {
+		case IH_COMP_NONE:
+#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
+			{
+				size_t l = len;
+				size_t tail;
+				void *to = (void *) dest;
+				void *from = (void *)data;
+
+				printf ("   Loading part %d ... ", part);
+
+				while (l > 0) {
+					tail = (l > CHUNKSZ) ? CHUNKSZ : l;
+					WATCHDOG_RESET();
+					memmove (to, from, tail);
+					to += tail;
+					from += tail;
+					l -= tail;
+				}
+			}
+#else	/* !(CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG) */
+			printf ("   Loading part %d ... ", part);
+			memmove ((char *) dest, (char *)data, len);
+#endif	/* CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG */
+			break;
+		case IH_COMP_GZIP:
+			printf ("   Uncompressing part %d ... ", part);
+			if (gunzip ((void *) dest, unc_len,
+				    (uchar *) data, &len) != 0) {
+				puts ("GUNZIP ERROR - image not loaded\n");
+				return 1;
+			}
+			break;
+#if defined(CONFIG_BZIP2)
+		case IH_COMP_BZIP2:
+			printf ("   Uncompressing part %d ... ", part);
+			/*
+			 * If we've got less than 4 MB of malloc() space,
+			 * use slower decompression algorithm which requires
+			 * at most 2300 KB of memory.
+			 */
+			i = BZ2_bzBuffToBuffDecompress
+				((char*)ntohl(hdr->ih_load),
+				 &unc_len, (char *)data, len,
+				 CONFIG_SYS_MALLOC_LEN < (4096 * 1024), 0);
+			if (i != BZ_OK) {
+				printf ("BUNZIP2 ERROR %d - "
+					"image not loaded\n", i);
+				return 1;
+			}
+			break;
+#endif /* CONFIG_BZIP2 */
+		default:
+			printf ("Unimplemented compression type %d\n", comp);
+			return 1;
+		}
+		puts ("OK\n");
 	}
 
 	sprintf(pbuf, "%8lx", data);