1 /*
2 * Copyright 2021 NXP
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 */
7
8 #include <stdint.h>
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include <string.h>
12
13 #include <getopt.h>
14 #include <unistd.h>
15
16 #define NUM_MEM_BLOCK 1
17 #define FOUR_BYTE_ALIGN 4
18 #define EIGHT_BYTE_ALIGN 8
19 #define SIZE_TWO_PBL_CMD 24
20
21 #define SUCCESS 0
22 #define FAILURE -1
23 #define BYTE_SWAP_32(word) ((((word) & 0xff000000) >> 24)| \
24 (((word) & 0x00ff0000) >> 8) | \
25 (((word) & 0x0000ff00) << 8) | \
26 (((word) & 0x000000ff) << 24))
27
28
29 /*
30 * Returns:
31 * SUCCESS, on successful byte swapping.
32 * FAILURE, on failure.
33 */
do_byteswap(FILE * fp)34 int do_byteswap(FILE *fp)
35 {
36 int bytes = 0;
37 uint32_t upper_byte;
38 uint32_t lower_byte;
39 uint32_t pad = 0U;
40 /* Carries number of Padding bytes to be appended to
41 * make file size 8 byte aligned.
42 */
43 int append_bytes;
44 int ret = FAILURE;
45
46 fseek(fp, 0L, SEEK_END);
47 bytes = ftell(fp);
48
49 append_bytes = EIGHT_BYTE_ALIGN - (bytes % EIGHT_BYTE_ALIGN);
50 if (append_bytes != 0) {
51 if (fwrite(&pad, append_bytes, NUM_MEM_BLOCK, fp)
52 != NUM_MEM_BLOCK) {
53 printf("%s: Error in appending padding bytes.\n",
54 __func__);
55 goto byteswap_err;
56 }
57 bytes += append_bytes;
58 }
59
60 rewind(fp);
61 while (bytes > 0) {
62 if ((fread(&upper_byte, sizeof(upper_byte), NUM_MEM_BLOCK, fp)
63 != NUM_MEM_BLOCK) && (feof(fp) == 0)) {
64 printf("%s: Error reading upper bytes.\n", __func__);
65 goto byteswap_err;
66 }
67 if ((fread(&lower_byte, sizeof(lower_byte), NUM_MEM_BLOCK, fp)
68 != NUM_MEM_BLOCK) && (feof(fp) == 0)) {
69 printf("%s: Error reading lower bytes.\n", __func__);
70 goto byteswap_err;
71 }
72 fseek(fp, -8L, SEEK_CUR);
73 upper_byte = BYTE_SWAP_32(upper_byte);
74 lower_byte = BYTE_SWAP_32(lower_byte);
75 if (fwrite(&lower_byte, sizeof(lower_byte), NUM_MEM_BLOCK, fp)
76 != NUM_MEM_BLOCK) {
77 printf("%s: Error writing lower bytes.\n", __func__);
78 goto byteswap_err;
79 }
80 if (fwrite(&upper_byte, sizeof(upper_byte), NUM_MEM_BLOCK, fp)
81 != NUM_MEM_BLOCK) {
82 printf("%s: Error writing upper bytes.\n", __func__);
83 goto byteswap_err;
84 }
85 bytes -= EIGHT_BYTE_ALIGN;
86 }
87 ret = SUCCESS;
88
89 byteswap_err:
90 return ret;
91 }
92
main(int argc,char ** argv)93 int main(int argc, char **argv)
94 {
95 FILE *fp = NULL;
96 int ret = 0;
97
98 if (argc > 2) {
99 printf("Usage format is byteswap <filename>");
100 return -1;
101 }
102
103 fp = fopen(argv[1], "rb+");
104 if (fp == NULL) {
105 printf("%s: Error opening the input file: %s\n",
106 __func__, argv[1]);
107 return -1;
108 }
109
110 ret = do_byteswap(fp);
111 fclose(fp);
112 return ret;
113 }
114