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/*
* Stripe a flash image across multiple files.
*
* Copyright (C) 2019 Xilinx, Inc. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
/* N way (num) in place bit striper. Lay out row wise bits column wise
* (from element 0 to N-1). num is the length of x, and dir reverses the
* direction of the transform. be determines the bit endianess scheme.
* false to lay out bits LSB to MSB (little endian) and true for big endian.
*
* Best illustrated by examples:
* Each digit in the below array is a single bit (num == 3, be == false):
*
* {{ 76543210, } ----- stripe (dir == false) -----> {{ FCheb630, }
* { hgfedcba, } { GDAfc741, }
* { HGFEDCBA, }} <---- upstripe (dir == true) ----- { HEBgda52, }}
*
* Same but with be == true:
*
* {{ 76543210, } ----- stripe (dir == false) -----> {{ 741gdaFC, }
* { hgfedcba, } { 630fcHEB, }
* { HGFEDCBA, }} <---- upstripe (dir == true) ----- { 52hebGDA, }}
*/
static inline void stripe8(uint8_t *x, int num, bool dir, bool be)
{
uint8_t r[num];
memset(r, 0, sizeof(uint8_t) * num);
int idx[2] = {0, 0};
int bit[2] = {0, be ? 7 : 0};
int d = dir;
for (idx[0] = 0; idx[0] < num; ++idx[0]) {
for (bit[0] = be ? 7 : 0; bit[0] != (be ? -1 : 8); bit[0] += be ? -1 : 1) {
r[idx[!d]] |= x[idx[d]] & 1 << bit[d] ? 1 << bit[!d] : 0;
idx[1] = (idx[1] + 1) % num;
if (!idx[1]) {
bit[1] += be ? -1 : 1;
}
}
}
memcpy(x, r, sizeof(uint8_t) * num);
}
int main (int argc, char *argv []) {
#ifdef UNSTRIPE
bool unstripe = true;
#else
bool unstripe = false;
#endif
#ifdef FLASH_STRIPE_BE
bool be = true;
#else
bool be = false;
#endif
int i;
const char *exe_name = argv[0];
argc--;
argv++;
if (argc < 2) {
fprintf(stderr, "ERROR: %s requires at least two args\n", exe_name);
return 1;
}
const char *single_f = argv[0];
int single;
if (unstripe) {
single = creat(single_f, 0644);
} else {
single = open(single_f, 0);
}
if (single == -1) {
perror(argv[0]);
return 1;
}
argv++;
argc--;
int multiple[argc];
for (i = 0; i < argc; ++i) {
if (unstripe) {
multiple[i] = open(argv[i], 0);
} else {
multiple[i] = creat(argv[i], 0644);
}
if (multiple[i] == -1) {
perror(argv[i]);
return 1;
}
}
while (true) {
uint8_t buf[argc];
for (i = 0; i < argc; ++i) {
switch (read(!unstripe ? single : multiple[
#if defined(FLASH_STRIPE_BW) && defined (FLASH_STRIPE_BE)
argc - 1 -
#endif
i], &buf[i], 1)) {
case 0:
if (i == 0) {
goto done;
} else if (!unstripe) {
fprintf(stderr, "WARNING:input file %s is not multiple of "
"%d bytes, padding with garbage byte\n", single_f,
argc);
}
break;
case -1:
perror(unstripe ? argv[i] : single_f);
return 1;
}
}
#ifndef FLASH_STRIPE_BW
stripe8(buf, argc, unstripe, be);
#endif
for (i = 0; i < argc; ++i) {
switch (write(unstripe ? single : multiple[
#if defined(FLASH_STRIPE_BW) && defined (FLASH_STRIPE_BE)
argc - 1 -
#endif
i], &buf[i], 1)) {
case -1:
perror(unstripe ? single_f : argv[i]);
return 1;
case 0:
i--; /* try again */
}
}
}
done:
close(single);
for (i = 0; i < argc; ++i) {
close(multiple[argc]);
}
return 0;
}
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