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Binary Grep

Home Page: http://debugmo.de/2009/04/bgrep-a-binary-grep/

C 78.67% Shell 10.33% Python 9.10% Makefile 1.90%

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rzr chenyuzhen nmcv jirka-h maelnor jaanek elektrischermoench shekkbuilder tomplus spachev ramiropolla cdsalmons zsmj513 noyesno zakdanger devinacker agutikov jnlon bossjones kermit4 olivierh59500 rsharo liyaoyu prodject manfar bkerler splinterxor clayne seabreg pticon dylanhe215 gromgit yungmichael suasm 5l1v3r1 letsunlockiphone xloem moneytech hartl3y94 emptywatson lulingar optionalg rilwansmith zb3 zlice ramonunch alishak ibaldov slonmron dbstephan

bgrep's Issues

`-B` fails with `lseek: Invalid argument` if it would start before the beginning of the file

Would be better to just start from 0 instead in that case:

printf '\x01\x02\x03' > tmp

Good:

bgrep -B2 03 tmp

output:

tmp: 00000002
\x01\x02

Bad:

bgrep -B3 03 tmp

output:

tmp: 00000002
lseek: Invalid argument

possible bug in dump_context error message

https://github.com/tmbinc/bgrep/blob/master/bgrep.c#L106-L108

int bytes_read = read(fd, buf, read_chunk);

if (bytes_to_read < 0)

That should be comparing bytes_read instead of bytes_to_read, right?

Feature Request: add a `-r` flag to search recursively

Be more verbose about the hex lenght limit

Invoking

~/bin/bgrep "0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000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/tmp/test1.img

causes failure with invalid/empty search string. This error message would be more helpful if it contained the length limit, so that one doesn't have to figure it out with trial and error.

Add argument to invert query endianess

E.g.:

bgrep -i 4 0102030405060708

would invert endianess and be equivalent to:

bgrep 00403020108070605

The magic case -i 0 could invert the entire string to: 0807060504030201.

Please tag a versioned release

Then we could write a recipe for bgrep in homebrew -- see:

Homebrew/legacy-homebrew#8519

Segmentation fault

$ ./bgrep -B 23
Segmentation fault

One parameter file is missing, and a Segmentation fault occurs. Since char *h = argv[1]; argv[1] does not exist. Adding a check is a good option. Thank you!

Big files and 32 bit machines

I have to use the gcc -D_FILE_OFFSET_BITS=64 flag to make it work for big files on a 32 bit machine. I also replaced

printf("%s: %08llx\n", filename, pos);

printf("%s: %016llx\n", filename, pos);

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