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/*****************************************************************************\
* hexdump.c
\*****************************************************************************/
#include "hexdump.h"
/* hexdump.c
*
* Copyright (C) 2002
* David S. Peterson. All rights reserved.
*
* Author: David S. Peterson <dave_peterson@pobox.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions, and the entire permission notice, including
* the following disclaimer of warranties.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions, and the entire permission notice,
* including the following disclaimer in the documentation and/or other
* materials provided with the distribution.
* 3. The name(s) of the author(s) may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* ALTERNATIVELY, this product may be distributed under the terms of the GNU
* General Public License, in which case the provisions of the GPL are
* required INSTEAD OF the above restrictions. (This clause is necessary due
* to a potential bad interaction between the GPL and the restrictions
* contained in a BSD-style copyright.)
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
static void addrprint(FILE * outfile, uint64_t address, int width);
static void hexprint(FILE * outfile, unsigned char byte);
static void charprint(FILE * outfile, unsigned char byte,
unsigned char nonprintable,
is_printable_fn_t is_printable_fn);
/*--------------------------------------------------------------------------
* hexdump
*
* Write a hex dump of 'mem' to 'outfile'.
*
* parameters:
* mem: a pointer to the memory to display
* bytes: the number of bytes of data to display
* addrprint_start: The address to associate with the first byte of
* data. For instance, a value of 0 indicates that the
* first byte displayed should be labeled as byte 0.
* outfile: The place where the hex dump should be written.
* For instance, stdout or stderr may be passed here.
* format: A structure specifying how the hex dump should be
* formatted.
*--------------------------------------------------------------------------*/
void hexdump(const void *mem, int bytes, uint64_t addrprint_start,
FILE * outfile, const hexdump_format_t * format)
{
int bytes_left, index, i;
const unsigned char *p;
is_printable_fn_t is_printable_fn;
/* Quietly return if the caller asks us to do something unreasonable. */
if ((format->bytes_per_line <= 0) || (bytes < 0))
return;
is_printable_fn = format->is_printable_fn;
if (is_printable_fn == NULL)
is_printable_fn = default_is_printable_fn;
p = (const unsigned char *)mem;
index = 0;
/* Each iteration handles one full line of output. When loop
* terminates, the number of remaining bytes to display (if any)
* will not be enough to fill an entire line.
*/
for (bytes_left = bytes;
bytes_left >= format->bytes_per_line;
bytes_left -= format->bytes_per_line) {
/* print start address for current line */
fprintf(outfile, format->indent);
addrprint(outfile, addrprint_start + index,
format->addrprint_width);
fprintf(outfile, format->sep1);
/* display the bytes in hex */
for (i = 0;;) {
hexprint(outfile, p[index++]);
if (++i >= format->bytes_per_line)
break;
fprintf(outfile, format->sep2);
}
index -= format->bytes_per_line;
fprintf(outfile, format->sep3);
/* display the bytes as characters */
for (i = 0; i < format->bytes_per_line; i++)
charprint(outfile, p[index++], format->nonprintable,
is_printable_fn);
fprintf(outfile, "\n");
}
if (bytes_left == 0)
return;
/* print start address for last line */
fprintf(outfile, format->indent);
addrprint(outfile, addrprint_start + index, format->addrprint_width);
fprintf(outfile, format->sep1);
/* display bytes for last line in hex */
for (i = 0; i < bytes_left; i++) {
hexprint(outfile, p[index++]);
fprintf(outfile, format->sep2);
}
index -= bytes_left;
/* pad the rest of the hex byte area with spaces */
for (;;) {
fprintf(outfile, " ");
if (++i >= format->bytes_per_line)
break;
fprintf(outfile, format->sep2);
}
fprintf(outfile, format->sep3);
/* display bytes for last line as characters */
for (i = 0; i < bytes_left; i++)
charprint(outfile, p[index++], format->nonprintable,
is_printable_fn);
/* pad the rest of the character area with spaces */
for (; i < format->bytes_per_line; i++)
fprintf(outfile, " ");
fprintf(outfile, "\n");
}
/*--------------------------------------------------------------------------
* default_is_printable_fn
*
* Determine whether the input character is printable. The proper behavior
* for this type of function may be system-dependent. This function takes a
* conservative approach. If it is not adequate for your purposes, you can
* write your own.
*
* parameters:
* c: the input character
*
* return value:
* Return 1 if the input character is printable. Otherwise return 0.
*--------------------------------------------------------------------------*/
int default_is_printable_fn(unsigned char c)
{
return (c >= 0x20) && (c <= 0x7e);
}
/*--------------------------------------------------------------------------
* addrprint
*
* Display an address as a hexadecimal number.
*
* parameters:
* outfile: the place where the output should be written
* address: the address to display
* width: The number of bytes wide the address should be displayed as.
* Must be a value from 1 to 8.
*--------------------------------------------------------------------------*/
static void addrprint(FILE * outfile, uint64_t address, int width)
{
char s[17];
int i;
/* force the user's input to be valid */
if (width < 1)
width = 1;
else if (width > 8)
width = 8;
/* convert address to string */
sprintf(s, "%016llx", (unsigned long long)address);
/* write it out, with colons separating consecutive 16-bit
* chunks of the address
*/
for (i = 16 - (2 * width);;) {
fprintf(outfile, "%c", s[i]);
if (++i >= 16)
break;
if ((i % 4) == 0)
fprintf(outfile, ":");
}
}
/*--------------------------------------------------------------------------
* hexprint
*
* Display a byte as a two digit hex value.
*
* parameters:
* outfile: the place where the output should be written
* byte: the byte to display
*--------------------------------------------------------------------------*/
static void hexprint(FILE * outfile, unsigned char byte)
{
static const char tbl[] = {
'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
};
fprintf(outfile, "%c%c", tbl[byte >> 4], tbl[byte & 0x0f]);
}
/*--------------------------------------------------------------------------
* charprint
*
* Display a byte as its character representation.
*
* parameters:
* outfile: the place where the output should be written
* byte: the byte to display
* nonprintable: a substitute character to display if the byte
* represents a nonprintable character
* is_printable_fn: a function that returns a boolean value indicating
* whether a given character is printable
*--------------------------------------------------------------------------*/
static void charprint(FILE * outfile, unsigned char byte,
unsigned char nonprintable,
is_printable_fn_t is_printable_fn)
{
fprintf(outfile, "%c", is_printable_fn(byte) ? byte : nonprintable);
}
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