Hi all,
I have a binary file (file.bin) and i want to display it exactly like the command "od -x" do, for example:
give me this output :Code:od -x file.bin
I want to store all this output in a char buffer to do some other stuff...Code:4bff 4200 331f 0000 0051 fff1 ffff 4bff 4200 001f 0811 0000 1000 5033 0214 0912 4120 1450 1202 2009 5047 0214 0912 0020 0000 0000 0000 0000 0006 0000 0000 ff00
Is there a simple manner to do that? Thanks for your help.
Many regards.
Search the board -- there are tons of posts on this topic.
Code:#include <cmath> #include <complex> bool euler_flip(bool value) { return std::pow ( std::complex<float>(std::exp(1.0)), std::complex<float>(0, 1) * std::complex<float>(std::atan(1.0) *(1 << (value + 2))) ).real() < 0; }
If you are on Linux then you could use popen to pipe the output of od -x file.bin into your program.
thanks guys for your answers, i don't want to use the "od -x" command, i want to do the same thing without using it.
Thanks.
If the binary data has it's "rows" separated by a newline, then fgets() would be an obvious choice.
If the space between the data is in the file already, then you're ready for output as you wish. If not, a simple "output 1 data item, output N number of spaces (or tabs)", logic is needed.
Give it a try, and come back if you get stuck and post your code so we have something specific to refer to.
Thanks Adak for the reply, my code is :
And the input.bin (the binary file) is : (od -x input.bin)Code:#include <stdio.h> #include <stdlib.h> int main () { FILE *fd; char line[BUFSIZ]; int i; if (NULL == (fd = fopen ("input.bin", "r"))) { fprintf (stderr, "Can't open file\n"); exit (EXIT_FAILURE); } while (fgets (line, BUFSIZ, fd)) { for(i = 0;i < BUFSIZ;++i) printf("%.2X ", (int)line[i]); } if (!feof(fd)) { fprintf (stderr, "Raed error\n"); exit (EXIT_FAILURE); } fclose (fd); printf ("\n"); return 0; }
if you run the program the out you get is not the same as od -x input.bin.Code:0000000 0219 0912 4820 1905 1202 2009 0000 0000 0000020 0003 0000 0000 0003 0000 0000 0000 0000 0000040 ff01 ffff ffff ffff ffff ffff ffff 05ff 0000060 0505 0605 2605 6364 f246 ffff ffff ffff 0000100 00ff 4132 02bf 0300 0010 0001 0000 ffff 0000120 ffff ffff ffff ffff ffff ffff ffff ffff 0000140 0000 0000 0000 0000 0000 0000 0000 0000 0000160 00ff 0000 ffff ffff ffff ffff ffff ffff 0000200 00ff 05ff 08ff 01f0 08ff 01f0 ffff ffff 0000220 ffff ffff 02ff 0533 0219 0912 ff20 5343 0000240 5049 3230 2020 ffff ffff ffff ffff 0506 0000260 5717 0801 8000 f300 ffff ffff 0000 00db 0000300 9512 0020 0000 60a3 4132 02bf 3300 0000 0000320 0051 fff1 ffff 00ff 0000 0505 7133 7293 0000340 f073 ffff ffff ffff 0506 6426 4663 fff2 0000360 ffff ffff ffff 0401 ffff 0000 0011 0000 0000400 3400 1905 1202 2009 0544 0219 0912 4820 0000420 1905 1202 2009 0000 0000 0000 0003 0000 0000440 0000 0000 ff00 0300 0000 0000 0000 ff00 0000460 ffff ffff ffff ffff ffff ffff ffff 00ff 0000500 0534 0219 0912 3220 bf41 0002 0001 0000 0000520 ffff ffff ffff ffff ffff ffff ffff 0000 0000540 ff00 ffff ffff ffff ffff ffff ffff 33ff 0000560 1905 1202 2009 ffff ffff 0506 5717 0801 0000600 8000 f300 ffff ffff ffff ffff ffff ffff 0000620 5343 5049 3230 2020 49ff 0101 2098 0000 0000640 1d00 3298 c041 0002 0033 5100 f100 ffff 0000660 ffff 0000 4200 2117 0100 1400 53f0 6228 0000700 2530 6841 33f0 9371 7372 fff0 ffff 00ff 0000720 ff07 ffff ffff ffff ffff ffff ffff ffff 0000740 06ff 5371 0520 fff8 ffff ffff ffff ffff 0000760 1004 0537 8052 ffff ffff ffff 4bff 4300 0001000 331f 0000 0051 fff1 ffff 4bff 4300 011f 0001020 ff04 00ff 0011 0000 ff00 2430 1912 1202 0001040 2009 1235 0219 0912 4420 1912 1202 2009 0001060 0000 0000 0003 0000 0000 0009 0000 0000 0001100 0000 0000 ff01 ffff ffff ffff ffff ffff 0001120 ffff 05ff 0505 0605 7105 2053 f805 ffff 0001140 ffff ffff 00ff 4132 02c0 0300 0010 0001 0001160 0000 ffff ffff ffff ffff ffff ffff ffff 0001200 ffff ffff 0000 0000 0000 0000 0000 0000 0001220 0000 0000 00ff 0000 ffff ffff ffff ffff 0001240 ffff ffff 00ff 05ff 08ff 01f0 08ff 01f0 0001260 ffff ffff ffff ffff 02ff 1223 0219 0912 0001300 ff20 5343 5049 3230 2020 ffff ffff ffff 0001320 ffff 0506 5717 0801 8000 f300 ffff ffff 0001340 0000 00db 9912 0020 0000 606b 4132 02c0 0001360 3300 0000 0051 fff1 ffff 00ff 0000 0505 0001400 7133 7293 f073 ffff ffff ffff 0506 5371 0001420 0520 fff8 ffff ffff ffff 0401 ffff 0000 0001440 0011 0000 2400 1912 1202 2009 1235 0219 0001460 0912 4420 1912 1202 2009 0000 0000 0000 0001500 0009 0000 0000 0000 ff00 0900 0000 0000 0001520 0000 ff00 ffff ffff ffff ffff ffff ffff 0001540 ffff 00ff 1224 0219 0912 3220 c041 0002 0001560 0001 0000 ffff ffff ffff ffff ffff ffff 0001600 ffff 0000 ff00 ffff ffff ffff ffff ffff
Thanks.
'fgets' is for character-based files. You need to open the file in binary mode and then read in the data with fgetc, fread, or similar.
Code:#include <cmath> #include <complex> bool euler_flip(bool value) { return std::pow ( std::complex<float>(std::exp(1.0)), std::complex<float>(0, 1) * std::complex<float>(std::atan(1.0) *(1 << (value + 2))) ).real() < 0; }
Read input file a char at a time with fgetc(), and format the output i.e. adjacent bytes (not) separated by whitespace if byte count modulo 2 (does not) equals zero.
I think you misunderstood what the OP said. The input file is not text that contains hex strings, but an actual binary file.Originally Posted by Adak
The "od" command outputs the addresses as octal numbers, which IMO is not very practical. You can easily change that to hex by changing "%08o" to "%08X" though.
Code:#include <stdio.h> #include <stdlib.h> int main () { FILE *in; unsigned int i=0; unsigned short val=0; in = fopen("main.c", "r"); if(in == NULL) { fprintf (stderr, "Can't open file.\n"); return EXIT_FAILURE; } while(fread(&val, 1, sizeof(unsigned short), in)) { if(i%8 == 0) { printf("\n%08o ", i*sizeof(unsigned short)); } printf("%04X ", val); val=0; i++; } if(!feof(in)) { fprintf(stderr, "Read error.\n"); fclose(in); return EXIT_FAILURE; } fclose(in); printf("\n"); return EXIT_SUCCESS; }
"The Internet treats censorship as damage and routes around it." - John Gilmore
Thanks maxorator, your program seems to be what i need, i got this warning :
Thanks for your good explanation of how "od" works. Great answerCode:warning: format ‘%08o’ expects type ‘unsigned int’, but argument 2 has type ‘long unsigned int’.
Many regards.
When you print long integers, signed or unsigned, in any base, prefix the base with l (L) and the warning goes away.
Thanks whiteflags
Regards.
It cant work.
"rb" for fopen is needed.
"%04x" not "%04X" is needed.
The closing feof is redundant.
fread must test for 2 (numblocks) not for !=0.
It's recommended to use for portability but won't usually change anything (at least on an UNIX-based OS which the OP seems to be using). I don't usually use the C standard library to mess with binary files so I forgot to add that.
Whether I like hex with upper or lower case letters is completely up to me. I don't think there is a standard out there that would say only lower case hex letters are allowed.
It's not. It checks whether reading ended because of end of file or because of an error.
In that case it would strip the last partial block if the number of bytes in the file is not aligned to 2 bytes. Since fread always returns 0 on failure, this is a totally valid check to see whether any bytes were read.
Last edited by maxorator; 08-24-2010 at 05:14 PM.
"The Internet treats censorship as damage and routes around it." - John Gilmore
If that is the behavior you want, shouldn't you reverse the `1' and `sizeof(unsigned short)'?In that case it would strip the last partial block if the number of bytes in the file is not aligned to 2 bytes. Since fread always returns 0 on failure, this is a totally valid check to see whether any bytes were read.
Actually, you should reverse them anyway.
Soma
