blob: 9c32f4a5725fc8503c42f958f705eb683a3b8bbc [file] [log] [blame]
/*
* (C) Copyright 2011 Free Electrons
* David Wagner <david.wagner@free-electrons.com>
*
* Inspired from envcrc.c:
* (C) Copyright 2001
* Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <compiler.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <u-boot/crc.h>
#define CRC_SIZE sizeof(uint32_t)
static void usage(const char *exec_name)
{
fprintf(stderr, "%s [-h] [-r] [-b] [-p <byte>] "
"-s <environment partition size> -o <output> <input file>\n"
"\n"
"This tool takes a key=value input file (same as would a "
"`printenv' show) and generates the corresponding environment "
"image, ready to be flashed.\n"
"\n"
"\tThe input file is in format:\n"
"\t\tkey1=value1\n"
"\t\tkey2=value2\n"
"\t\t...\n"
"\t-r : the environment has multiple copies in flash\n"
"\t-b : the target is big endian (default is little endian)\n"
"\t-p <byte> : fill the image with <byte> bytes instead of "
"0xff bytes\n"
"\n"
"If the input file is \"-\", data is read from standard input\n",
exec_name);
}
int main(int argc, char **argv)
{
uint32_t crc, targetendian_crc;
const char *txt_filename = NULL, *bin_filename = NULL;
int txt_fd, bin_fd;
unsigned char *dataptr, *envptr;
unsigned char *filebuf = NULL;
unsigned int filesize = 0, envsize = 0, datasize = 0;
int bigendian = 0;
int redundant = 0;
unsigned char padbyte = 0xff;
int option;
int ret = EXIT_SUCCESS;
struct stat txt_file_stat;
int fp, ep;
/* Parse the cmdline */
while ((option = getopt(argc, argv, "s:o:rbp:h")) != -1) {
switch (option) {
case 's':
datasize = strtol(optarg, NULL, 0);
break;
case 'o':
bin_filename = strdup(optarg);
if (!bin_filename) {
fprintf(stderr, "Can't strdup() the output "
"filename\n");
return EXIT_FAILURE;
}
break;
case 'r':
redundant = 1;
break;
case 'b':
bigendian = 1;
break;
case 'p':
padbyte = strtol(optarg, NULL, 0);
break;
case 'h':
usage(argv[0]);
return EXIT_SUCCESS;
default:
fprintf(stderr, "Wrong option -%c\n", option);
usage(argv[0]);
return EXIT_FAILURE;
}
}
/* Check datasize and allocate the data */
if (datasize == 0) {
fprintf(stderr,
"Please specify the size of the envrionnment "
"partition.\n");
usage(argv[0]);
return EXIT_FAILURE;
}
dataptr = malloc(datasize * sizeof(*dataptr));
if (!dataptr) {
fprintf(stderr, "Can't alloc dataptr.\n");
return EXIT_FAILURE;
}
/*
* envptr points to the beginning of the actual environment (after the
* crc and possible `redundant' bit
*/
envsize = datasize - (CRC_SIZE + redundant);
envptr = dataptr + CRC_SIZE + redundant;
/* Pad the environment with the padding byte */
memset(envptr, padbyte, envsize);
/* Open the input file ... */
if (optind >= argc) {
fprintf(stderr, "Please specify an input filename\n");
return EXIT_FAILURE;
}
txt_filename = argv[optind];
if (strcmp(txt_filename, "-") == 0) {
int readbytes = 0;
int readlen = sizeof(*envptr) * 2048;
txt_fd = STDIN_FILENO;
do {
filebuf = realloc(filebuf, readlen);
readbytes = read(txt_fd, filebuf + filesize, readlen);
filesize += readbytes;
} while (readbytes == readlen);
} else {
txt_fd = open(txt_filename, O_RDONLY);
if (txt_fd == -1) {
fprintf(stderr, "Can't open \"%s\": %s\n",
txt_filename, strerror(errno));
return EXIT_FAILURE;
}
/* ... and check it */
ret = fstat(txt_fd, &txt_file_stat);
if (ret == -1) {
fprintf(stderr, "Can't stat() on \"%s\": "
"%s\n", txt_filename, strerror(errno));
return EXIT_FAILURE;
}
filesize = txt_file_stat.st_size;
/* Read the raw input file and transform it */
filebuf = malloc(sizeof(*envptr) * filesize);
ret = read(txt_fd, filebuf, sizeof(*envptr) * filesize);
if (ret != sizeof(*envptr) * filesize) {
fprintf(stderr, "Can't read the whole input file\n");
return EXIT_FAILURE;
}
ret = close(txt_fd);
}
/*
* The right test to do is "=>" (not ">") because of the additionnal
* ending \0. See below.
*/
if (filesize >= envsize) {
fprintf(stderr, "The input file is larger than the "
"envrionnment partition size\n");
return EXIT_FAILURE;
}
/* Replace newlines separating variables with \0 */
for (fp = 0, ep = 0 ; fp < filesize ; fp++) {
if (filebuf[fp] == '\n') {
if (fp == 0) {
/*
* Newline at the beggining of the file ?
* Ignore it.
*/
continue;
} else if (filebuf[fp-1] == '\\') {
/*
* Embedded newline in a variable.
*
* The backslash was added to the envptr ;
* rewind and replace it with a newline
*/
ep--;
envptr[ep++] = '\n';
} else {
/* End of a variable */
envptr[ep++] = '\0';
}
} else if (filebuf[fp] == '#') {
if (fp != 0 && filebuf[fp-1] == '\n') {
/* This line is a comment, let's skip it */
while (fp < txt_file_stat.st_size && fp++ &&
filebuf[fp] != '\n');
} else {
envptr[ep++] = filebuf[fp];
}
} else {
envptr[ep++] = filebuf[fp];
}
}
/*
* Make sure there is a final '\0'
* And do it again on the next byte to mark the end of the environment.
*/
if (envptr[ep-1] != '\0') {
envptr[ep++] = '\0';
/*
* The text file doesn't have an ending newline. We need to
* check the env size again to make sure we have room for two \0
*/
if (ep >= envsize) {
fprintf(stderr, "The environment file is too large for "
"the target environment storage\n");
return EXIT_FAILURE;
}
envptr[ep] = '\0';
} else {
envptr[ep] = '\0';
}
/* Computes the CRC and put it at the beginning of the data */
crc = crc32(0, envptr, envsize);
targetendian_crc = bigendian ? cpu_to_be32(crc) : cpu_to_le32(crc);
memcpy(dataptr, &targetendian_crc, sizeof(uint32_t));
bin_fd = creat(bin_filename, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
if (bin_fd == -1) {
fprintf(stderr, "Can't open output file \"%s\": %s\n",
bin_filename, strerror(errno));
return EXIT_FAILURE;
}
if (write(bin_fd, dataptr, sizeof(*dataptr) * datasize) !=
sizeof(*dataptr) * datasize) {
fprintf(stderr, "write() failed: %s\n", strerror(errno));
return EXIT_FAILURE;
}
ret = close(bin_fd);
return ret;
}