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Full Discussion: Edit file hexadecimal with xxd
Top Forums Shell Programming and Scripting Edit file hexadecimal with xxd Post 302965992 by wisecracker on Friday 5th of February 2016 06:33:10 PM
Old 02-05-2016
Not sure if this is what is required...
Shell builtins around xxd as xxd has some strange quirks in spitting out a pure hexdump...
OSX 10.7.5 default bash terminal.
Code:
#¡/bin/bash
# bin_edit
# Create a working binary file...
echo ""
BIN_ARRAY=( 00 00 00 00 00 00 00 00 00 00 00 00 49 3a 00 4f 63 74 20 32 38 20 32 30 31 35 20 31 39 3a 32 34 )
for n in {0..31} 
do
	echo -en "\x${BIN_ARRAY[$n]}"
done > /tmp/bin
# Prove binary exists...
xxd /tmp/bin
# Now create the edit...
HEX=( $( xxd -cols 1 -p /tmp/bin ) )
# Now edit...
NEWHEX=""
for n in $( seq 0 2 ${#HEX[@]} )
do
	OLDHEX="${HEX[$n]}${HEX[$(($n+1))]}"
	if [ "$OLDHEX" = "493a" ]
	then
		:
	else
		echo -en "$NEWHEX$OLDHEX"
	fi
done > /tmp/texthexdump
echo ""
# 0x493a now removed creating new binary file...
read -r line < /tmp/texthexdump
n=0
while [ $n -lt ${#line} ]
do
	echo -en "\x${line:$n:2}"
	n=$(($n+2))
done > /tmp/newbin
xxd /tmp/newbin
echo ""

Results:-
Code:
Last login: Fri Feb  5 22:34:02 on ttys000
AMIGA:barrywalker~> cd Desktop/Code/Shell
AMIGA:barrywalker~/Desktop/Code/Shell> ./bin_edit

0000000: 0000 0000 0000 0000 0000 0000 493a 004f  ............I:.O
0000010: 6374 2032 3820 3230 3135 2031 393a 3234  ct 28 2015 19:24

0000000: 0000 0000 0000 0000 0000 0000 004f 6374  .............Oct
0000010: 2032 3820 3230 3135 2031 393a 3234        28 2015 19:24

AMIGA:barrywalker~/Desktop/Code/Shell> _

This will take out ALL '493a' on even addresses only but odd adresses can be catered for.
 

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LEARN ABOUT SUNOS

mlib_videocoloruyv444int_to_argbint

mlib_VideoColorUYV444int_to_ARGBint(3MLIB)		    mediaLib Library Functions			mlib_VideoColorUYV444int_to_ARGBint(3MLIB)

NAME

       mlib_VideoColorUYV444int_to_ARGBint - color convert UYV interleaved to ARGB interleaved

SYNOPSIS

       cc [ flag... ] file... -lmlib [ library... ]
       #include <mlib.h>

       void  mlib_VideoColorUYV444int_to_ARGBint(mlib_u32 *ARGB, const mlib_u8 *UYV, const mlib_u8 *A_array, mlib_u8 A_const, mlib_s32 w, mlib_s32
       h, mlib_s32 dlb, mlib_s32 slb, mlib_s32 alb);

DESCRIPTION

       The UYV pixel stream is converted into an ARGB pixel stream. All pixel components are 8-bit unsigned integers. All buffers have	dimensions
       w and h.

       The alpha values for this function work in the following fashion:

	 o  If A_array pointer is not NULL, the values are taken from there. It has to have the same dimensions as the Y buffer.

	 o  If A_array pointer is NULL, the alpha values for every pixel are set to A_const.

       The following equation is used:

       |R|   |1.1644  0.0000  1.5966|	[|Y|   | 16.0000|]
       |G| = |1.1644 -0.3920 -0.8132| * [|U| - |128.0000|]
       |B|   |1.1644  2.0184  0.0000|	[|V|   |128.0000|]

PARAMETERS

       The function takes the following arguments:

       ARGB	       Pointer to output buffer.

       UYV	       Pointer to input buffer.

       A_array	       Array of alpha values.

       A_const	       Constant alpha value.

       w	       Image width in pixels.

       h	       Image height in lines.

       dlb	       Linebytes for output buffer.

       slb	       Linebytes for input buffer.

       alb	       Linebytes for alpha buffer.

RETURN VALUES

       None.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       mlib_VideoColorYUV420seq_to_ARGBint(3MLIB),     mlib_VideoColorYUV411seq_to_ARGBint(3MLIB),     mlib_VideoColorYUV422seq_to_ARGBint(3MLIB),
       mlib_VideoColorYUV444seq_to_ARGBint(3MLIB),     mlib_VideoColorYUV420seq_to_ABGRint(3MLIB),     mlib_VideoColorYUV411seq_to_ABGRint(3MLIB),
       mlib_VideoColorYUV422seq_to_ABGRint(3MLIB),     mlib_VideoColorYUV444seq_to_ABGRint(3MLIB),    mlib_VideoColorYUYV422int_to_ARGBint(3MLIB),
       mlib_VideoColorYUV444int_to_ARGBint(3MLIB),    mlib_VideoColorYUYV422int_to_ABGRint(3MLIB),     mlib_VideoColorYUV444int_to_ABGRint(3MLIB),
       mlib_VideoColorUYVY422int_to_ARGBint(3MLIB),    mlib_VideoColorUYVY422int_to_ABGRint(3MLIB),    mlib_VideoColorUYV444int_to_ABGRint(3MLIB),
       attributes(5)

SunOS 5.10							    10 Nov 2004 			mlib_VideoColorUYV444int_to_ARGBint(3MLIB)
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