[PATCH u-boot-marvell 07/11] tools: kwbimage: Do not put final image padding to the image data size

["Marek Behún" <kabel@kernel.org>]

From: Pali Rohár <pali@kernel.org>

This change allows to convert image from one format to another without need
to include unnecessary padding (e.g. when target image format has smaller
alignment requirement as source image format).

Do it by storing real image data size without padding to the kwbimage
header.

Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Marek Behún <marek.behun@nic.cz>
---
 tools/kwbimage.c | 30 +++++++++++++++++++++---------
 1 file changed, 21 insertions(+), 9 deletions(-)

diff --git a/tools/kwbimage.c b/tools/kwbimage.c
index b939b4cb49..a6f2659ab4 100644
--- a/tools/kwbimage.c
+++ b/tools/kwbimage.c
@@ -890,7 +890,7 @@ static void *image_create_v0(size_t *imagesz, struct image_tool_params *params,
 
 	/* Fill in the main header */
 	main_hdr->blocksize =
-		cpu_to_le32(payloadsz - headersz);
+		cpu_to_le32(payloadsz);
 	main_hdr->srcaddr   = cpu_to_le32(headersz);
 	main_hdr->ext       = has_ext;
 	main_hdr->version   = 0;
@@ -1234,7 +1234,7 @@ static void *image_create_v1(size_t *imagesz, struct image_tool_params *params,
 
 	/* Fill the main header */
 	main_hdr->blocksize    =
-		cpu_to_le32(payloadsz - headersz);
+		cpu_to_le32(payloadsz);
 	main_hdr->headersz_lsb = cpu_to_le16(headersz & 0xFFFF);
 	main_hdr->headersz_msb = (headersz & 0xFFFF0000) >> 16;
 	main_hdr->destaddr     = cpu_to_le32(params->addr);
@@ -1345,7 +1345,7 @@ static void *image_create_v1(size_t *imagesz, struct image_tool_params *params,
 			return NULL;
 	}
 
-	if (secure_hdr && add_secure_header_v1(params, ptr, payloadsz,
+	if (secure_hdr && add_secure_header_v1(params, ptr, payloadsz + headersz,
 					       headersz, image, secure_hdr))
 		return NULL;
 
@@ -1575,9 +1575,22 @@ static void kwbimage_set_header(void *ptr, struct stat *sbuf, int ifd,
 	void *image = NULL;
 	int version;
 	size_t headersz = 0;
+	size_t datasz;
 	uint32_t checksum;
+	struct stat s;
 	int ret;
 
+	/*
+	 * Do not use sbuf->st_size as it contains size with padding.
+	 * We need original image data size, so stat original file.
+	 */
+	if (stat(params->datafile, &s)) {
+		fprintf(stderr, "Could not stat data file %s: %s\n",
+			params->datafile, strerror(errno));
+		exit(EXIT_FAILURE);
+	}
+	datasz = ALIGN(s.st_size, 4);
+
 	fcfg = fopen(params->imagename, "r");
 	if (!fcfg) {
 		fprintf(stderr, "Could not open input file %s\n",
@@ -1612,11 +1625,11 @@ static void kwbimage_set_header(void *ptr, struct stat *sbuf, int ifd,
 		 */
 	case -1:
 	case 0:
-		image = image_create_v0(&headersz, params, sbuf->st_size);
+		image = image_create_v0(&headersz, params, datasz + 4);
 		break;
 
 	case 1:
-		image = image_create_v1(&headersz, params, ptr, sbuf->st_size);
+		image = image_create_v1(&headersz, params, ptr, datasz + 4);
 		break;
 
 	default:
@@ -1633,11 +1646,10 @@ static void kwbimage_set_header(void *ptr, struct stat *sbuf, int ifd,
 
 	free(image_cfg);
 
-	/* Build and add image checksum header */
+	/* Build and add image data checksum */
 	checksum = cpu_to_le32(image_checksum32((uint8_t *)ptr + headersz,
-				sbuf->st_size - headersz - sizeof(uint32_t)));
-	memcpy((uint8_t *)ptr + sbuf->st_size - sizeof(uint32_t), &checksum,
-		sizeof(uint32_t));
+						datasz));
+	memcpy((uint8_t *)ptr + headersz + datasz, &checksum, sizeof(uint32_t));
 
 	/* Finally copy the header into the image area */
 	memcpy(ptr, image, headersz);
-- 
2.32.0