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![Guilherme Maciel Ferreira](/assets/img/avatar_default.png)
Given a multi-file image created through the mkimage's -d option: $ mkimage -A x86 -O linux -T multi -n x86 -d vmlinuz:initrd.img:System.map \ multi.img Image Name: x86 Created: Thu Jul 25 10:29:13 2013 Image Type: Intel x86 Linux Multi-File Image (gzip compressed) Data Size: 13722956 Bytes = 13401.32 kB = 13.09 MB Load Address: 00000000 Entry Point: 00000000 Contents: Image 0: 4040128 Bytes = 3945.44 kB = 3.85 MB Image 1: 7991719 Bytes = 7804.41 kB = 7.62 MB Image 2: 1691092 Bytes = 1651.46 kB = 1.61 MB It is possible to perform the innverse operation -- extracting any file from the image -- by using the dumpimage's -i option: $ dumpimage -i multi.img -p 2 System.map Although it's feasible to retrieve "data files" from image through scripting, the requirement to embed tools such 'dd', 'awk' and 'sed' for this sole purpose is cumbersome and unreliable -- once you must keep track of file sizes inside the image. Furthermore, extracting data files using "dumpimage" tool is faster than through scripting. Signed-off-by: Guilherme Maciel Ferreira <guilherme.maciel.ferreira@gmail.com> Signed-off-by: Simon Glass <sjg@chromium.org>
195 lines
4.9 KiB
C
195 lines
4.9 KiB
C
/*
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* (C) Copyright 2008 Semihalf
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*
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* (C) Copyright 2000-2004
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* DENX Software Engineering
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* Wolfgang Denk, wd@denx.de
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*
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* Updated-by: Prafulla Wadaskar <prafulla@marvell.com>
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* default_image specific code abstracted from mkimage.c
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* some functions added to address abstraction
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*
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* All rights reserved.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include "imagetool.h"
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#include <image.h>
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#include <u-boot/crc.h>
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static image_header_t header;
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static int image_check_image_types(uint8_t type)
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{
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if (((type > IH_TYPE_INVALID) && (type < IH_TYPE_FLATDT)) ||
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(type == IH_TYPE_KERNEL_NOLOAD))
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return EXIT_SUCCESS;
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else
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return EXIT_FAILURE;
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}
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static int image_check_params(struct image_tool_params *params)
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{
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return ((params->dflag && (params->fflag || params->lflag)) ||
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(params->fflag && (params->dflag || params->lflag)) ||
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(params->lflag && (params->dflag || params->fflag)));
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}
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static int image_verify_header(unsigned char *ptr, int image_size,
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struct image_tool_params *params)
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{
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uint32_t len;
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const unsigned char *data;
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uint32_t checksum;
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image_header_t header;
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image_header_t *hdr = &header;
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/*
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* create copy of header so that we can blank out the
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* checksum field for checking - this can't be done
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* on the PROT_READ mapped data.
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*/
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memcpy(hdr, ptr, sizeof(image_header_t));
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if (be32_to_cpu(hdr->ih_magic) != IH_MAGIC) {
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fprintf(stderr,
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"%s: Bad Magic Number: \"%s\" is no valid image\n",
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params->cmdname, params->imagefile);
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return -FDT_ERR_BADMAGIC;
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}
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data = (const unsigned char *)hdr;
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len = sizeof(image_header_t);
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checksum = be32_to_cpu(hdr->ih_hcrc);
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hdr->ih_hcrc = cpu_to_be32(0); /* clear for re-calculation */
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if (crc32(0, data, len) != checksum) {
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fprintf(stderr,
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"%s: ERROR: \"%s\" has bad header checksum!\n",
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params->cmdname, params->imagefile);
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return -FDT_ERR_BADSTATE;
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}
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data = (const unsigned char *)ptr + sizeof(image_header_t);
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len = image_size - sizeof(image_header_t) ;
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checksum = be32_to_cpu(hdr->ih_dcrc);
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if (crc32(0, data, len) != checksum) {
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fprintf(stderr,
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"%s: ERROR: \"%s\" has corrupted data!\n",
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params->cmdname, params->imagefile);
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return -FDT_ERR_BADSTRUCTURE;
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}
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return 0;
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}
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static void image_set_header(void *ptr, struct stat *sbuf, int ifd,
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struct image_tool_params *params)
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{
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uint32_t checksum;
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image_header_t * hdr = (image_header_t *)ptr;
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checksum = crc32(0,
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(const unsigned char *)(ptr +
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sizeof(image_header_t)),
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sbuf->st_size - sizeof(image_header_t));
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/* Build new header */
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image_set_magic(hdr, IH_MAGIC);
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image_set_time(hdr, sbuf->st_mtime);
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image_set_size(hdr, sbuf->st_size - sizeof(image_header_t));
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image_set_load(hdr, params->addr);
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image_set_ep(hdr, params->ep);
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image_set_dcrc(hdr, checksum);
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image_set_os(hdr, params->os);
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image_set_arch(hdr, params->arch);
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image_set_type(hdr, params->type);
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image_set_comp(hdr, params->comp);
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image_set_name(hdr, params->imagename);
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checksum = crc32(0, (const unsigned char *)hdr,
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sizeof(image_header_t));
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image_set_hcrc(hdr, checksum);
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}
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static int image_save_datafile(struct image_tool_params *params,
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ulong file_data, ulong file_len)
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{
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int dfd;
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const char *datafile = params->outfile;
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dfd = open(datafile, O_RDWR | O_CREAT | O_TRUNC | O_BINARY,
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S_IRUSR | S_IWUSR);
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if (dfd < 0) {
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fprintf(stderr, "%s: Can't open \"%s\": %s\n",
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params->cmdname, datafile, strerror(errno));
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return -1;
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}
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if (write(dfd, (void *)file_data, file_len) != (ssize_t)file_len) {
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fprintf(stderr, "%s: Write error on \"%s\": %s\n",
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params->cmdname, datafile, strerror(errno));
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close(dfd);
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return -1;
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}
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close(dfd);
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return 0;
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}
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static int image_extract_datafile(void *ptr, struct image_tool_params *params)
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{
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const image_header_t *hdr = (const image_header_t *)ptr;
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ulong file_data;
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ulong file_len;
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if (image_check_type(hdr, IH_TYPE_MULTI)) {
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ulong idx = params->pflag;
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ulong count;
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/* get the number of data files present in the image */
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count = image_multi_count(hdr);
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/* retrieve the "data file" at the idx position */
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image_multi_getimg(hdr, idx, &file_data, &file_len);
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if ((file_len == 0) || (idx >= count)) {
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fprintf(stderr, "%s: No such data file %ld in \"%s\"\n",
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params->cmdname, idx, params->imagefile);
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return -1;
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}
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} else {
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file_data = image_get_data(hdr);
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file_len = image_get_size(hdr);
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}
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/* save the "data file" into the file system */
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return image_save_datafile(params, file_data, file_len);
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}
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/*
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* Default image type parameters definition
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*/
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static struct image_type_params defimage_params = {
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.name = "Default Image support",
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.header_size = sizeof(image_header_t),
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.hdr = (void*)&header,
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.check_image_type = image_check_image_types,
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.verify_header = image_verify_header,
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.print_header = image_print_contents,
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.set_header = image_set_header,
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.extract_datafile = image_extract_datafile,
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.check_params = image_check_params,
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};
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void init_default_image_type(void)
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{
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register_image_type(&defimage_params);
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}
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