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/* $Id: copy.c,v 1.6 2005/05/19 20:59:12 harbourn Exp $
* dcfldd - The Enhanced Forensic DD
* By Nicholas Harbour
*/
/* Copyright (C) 85, 90, 91, 1995-2001, 2005 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* GNU dd originally written by Paul Rubin, David MacKenzie, and Stuart Kemp. */
#include "dcfldd.h"
#include <sys/types.h>
#include <stdlib.h>
#include <time.h>
#include "hash.h"
#include "getpagesize.h"
#include "safe-read.h"
#include "full-write.h"
#include "translate.h"
#include "sizeprobe.h"
#include "pattern.h"
#include "util.h"
#include "log.h"
#include "output.h"
static void write_output(void);
static void copy_simple(unsigned char const *, int);
static void copy_with_block(unsigned char const *, size_t);
static void copy_with_unblock(unsigned char const *, size_t);
/* Output buffer. */
unsigned char *obuf;
/* Current index into `obuf'. */
static size_t oc;
/* Index into current line, for `conv=block' and `conv=unblock'. */
static size_t col;
/* Write, then empty, the output buffer `obuf'. */
static void write_output(void)
{
/*int nwritten = full_write(STDOUT_FILENO, obuf, output_blocksize); */
int nwritten = outputlist_write(obuf, output_blocksize);
if (nwritten != output_blocksize) {
if (nwritten > 0)
w_partial++;
quit(1);
}
else
w_full++;
oc = 0;
}
/* Copy NREAD bytes of BUF, with no conversions. */
static void copy_simple(unsigned char const *buf, int nread)
{
int nfree; /* Number of unused bytes in `obuf'. */
const unsigned char *start = buf; /* First uncopied char in BUF. */
do {
nfree = output_blocksize - oc;
if (nfree > nread)
nfree = nread;
memcpy((char *) (obuf + oc), (char *) start, nfree);
nread -= nfree; /* Update the number of bytes left to copy. */
start += nfree;
oc += nfree;
if (oc >= output_blocksize)
write_output();
} while (nread > 0);
}
/* Copy NREAD bytes of BUF, doing conv=block
(pad newline-terminated records to `conversion_blocksize',
replacing the newline with trailing spaces). */
static void copy_with_block(unsigned char const *buf, size_t nread)
{
size_t i;
for (i = nread; i; i--, buf++) {
if (*buf == newline_character) {
if (col < conversion_blocksize) {
size_t j;
for (j = col; j < conversion_blocksize; j++)
output_char(space_character);
}
col = 0;
} else {
if (col == conversion_blocksize)
r_truncate++;
else if (col < conversion_blocksize)
output_char(*buf);
col++;
}
}
}
/* Copy NREAD bytes of BUF, doing conv=unblock
(replace trailing spaces in `conversion_blocksize'-sized records
with a newline). */
static void copy_with_unblock(unsigned char const *buf, size_t nread)
{
size_t i;
unsigned char c;
static int pending_spaces = 0;
for (i = 0; i < nread; i++) {
c = buf[i];
if (col++ >= conversion_blocksize) {
col = pending_spaces = 0; /* Wipe out any pending spaces. */
i--; /* Push the char back; get it later. */
output_char(newline_character);
} else if (c == space_character)
pending_spaces++;
else {
/* `c' is the character after a run of spaces that were not
at the end of the conversion buffer. Output them. */
while (pending_spaces) {
output_char(space_character);
--pending_spaces;
}
output_char(c);
}
}
}
/* The main loop. */
int dd_copy(void)
{
unsigned char *ibuf, *bufstart; /* Input buffer. */
unsigned char *real_buf; /* real buffer address before alignment */
unsigned char *real_obuf;
ssize_t nread; /* Bytes read in the current block. */
int exit_status = 0;
int input_from_stream = !!input_file;
int input_from_pattern = !input_from_stream;
size_t page_size = getpagesize();
size_t n_bytes_read;
/* Leave at least one extra byte at the beginning and end of `ibuf'
for conv=swab, but keep the buffer address even. But some peculiar
device drivers work only with word-aligned buffers, so leave an
extra two bytes. */
/* Some devices require alignment on a sector or page boundary
(e.g. character disk devices). Align the input buffer to a
page boundary to cover all bases. Note that due to the swab
algorithm, we must have at least one byte in the page before
the input buffer; thus we allocate 2 pages of slop in the
real buffer. 8k above the blocksize shouldn't bother anyone.
The page alignment is necessary on any linux system that supports
either the SGI raw I/O patch or Steven Tweedies raw I/O patch.
It is necessary when accessing raw (i.e. character special) disk
devices on Unixware or other SVR4-derived system. */
real_buf = (unsigned char *) malloc(input_blocksize
+ 2 * SWAB_ALIGN_OFFSET
+ 2 * page_size - 1);
ibuf = real_buf;
ibuf += SWAB_ALIGN_OFFSET; /* allow space for swab */
ibuf = PTR_ALIGN(ibuf, page_size);
/* Init */
if (do_hash)
hash_update(ihashlist, NULL, 0);
if (conversions_mask & C_TWOBUFS) {
/* Page-align the output buffer, too. */
real_obuf = (unsigned char *) malloc(output_blocksize + page_size - 1);
obuf = PTR_ALIGN(real_obuf, page_size);
} else {
real_obuf = NULL;
obuf = ibuf;
}
if (!input_from_pattern)
if (skip_records != 0)
skip(STDIN_FILENO, input_file, skip_records, input_blocksize, ibuf);
if (seek_records != 0) {
outputlist_t *listptr;
for (listptr = outputlist; listptr != NULL; listptr = listptr->next) {
skip(listptr->data.fd, "", seek_records, output_blocksize, obuf);
}
}
if (max_records == 0)
quit(exit_status);
if (input_from_pattern) {
replicate_pattern(pattern, ibuf, input_blocksize);
nread = n_bytes_read = input_blocksize;
}
while (1) {
/* Display an update message */
if (do_status && w_full % update_thresh == 0 && w_full != 0) {
off_t total_bytes = w_full * input_blocksize;
off_t total_mb = total_bytes / 1048576;
if (probe == PROBE_NONE || probed_size == 0)
fprintf(stderr, "\r%llu blocks (%lluMb) written.",
/* [FIX] copy.c:226:25: warning: format ‘%llu’ expects argument of type ‘long long unsigned int’, but argument {3,4} has type ‘uintmax_t’ [-Wformat=] */
(long long unsigned int) w_full, (long long unsigned int) total_mb);
else {
time_t curr_time = time(NULL);
int seconds = (int)difftime(curr_time, start_time);
off_t probed_mb = probed_size / 1048576;
float fprcnt = total_bytes / (float)probed_size;
float fprcnt_remaining = 1.0 - fprcnt;
int prcnt = (int)(fprcnt * 100);
int seconds_remaining = (int)(seconds *
(fprcnt_remaining / fprcnt));
char secstr[100];
time_left(secstr, sizeof secstr, seconds_remaining);
fprintf(stderr, "\r[%d%% of %lluMb] %llu blocks (%lluMb) written. %s",
/* [FIX] copy.c:240:25: warning: format ‘%llu’ expects argument of type ‘long long unsigned int’, but argument {4,5,6} has type ‘off_t’ [-Wformat=] */
prcnt, (long long unsigned int) probed_mb, (long long unsigned int) w_full, (long long unsigned int) total_mb, secstr);
}
}
if (r_partial + r_full >= max_records)
break;
/* Zero the buffer before reading, so that if we get a read error,
whatever data we are able to read is followed by zeros.
This minimizes data loss. */
if (!input_from_pattern) {
if ((conversions_mask & C_SYNC) && (conversions_mask & C_NOERROR))
memset((char *) ibuf,
(conversions_mask & (C_BLOCK | C_UNBLOCK)) ? ' ' : '\0',
input_blocksize);
nread = safe_read(STDIN_FILENO, ibuf, input_blocksize);
}
if (nread == 0)
break; /* EOF. */
if (nread < 0 && !input_from_pattern) {
syscall_error_noexit(input_file);
if (conversions_mask & C_NOERROR)
{
print_stats();
/* Seek past the bad block if possible. */
lseek(STDIN_FILENO, (off_t) input_blocksize, SEEK_CUR);
if (conversions_mask & C_SYNC) {
/* Replace the missing input with null bytes and
proceed normally. */
// EXPERIMENTAL: let's try re-zeroing this buffer
memset((char *) ibuf,
(conversions_mask & (C_BLOCK | C_UNBLOCK)) ? ' ' : '\0',
input_blocksize);
nread = 0;
} else
continue;
} else {
/* Write any partial block. */
exit_status = 2;
break;
}
}
n_bytes_read = nread;
if (do_hash && hashconv == HASHCONV_BEFORE)
hash_update(ihashlist, ibuf, n_bytes_read);
if (n_bytes_read < input_blocksize) {
r_partial++;
if (conversions_mask & C_SYNC) {
if (!(conversions_mask & C_NOERROR))
/* If C_NOERROR, we zeroed the block before reading. */
memset((char *) (ibuf + n_bytes_read),
(conversions_mask & (C_BLOCK | C_UNBLOCK)) ? ' ' : '\0',
input_blocksize - n_bytes_read);
n_bytes_read = input_blocksize;
}
}
else
r_full++;
if (ibuf == obuf) { /* If not C_TWOBUFS. */
/* int nwritten = full_write(STDOUT_FILENO, obuf, n_bytes_read); */
int nwritten = outputlist_write(obuf, n_bytes_read);
if (nwritten < 0)
syscall_error(output_file);
else if (n_bytes_read == input_blocksize)
w_full++;
else
w_partial++;
} else { /* If C_TWOBUFS */
/* Do any translations on the whole buffer at once. */
if (translation_needed)
translate_buffer(ibuf, n_bytes_read);
if (conversions_mask & C_SWAB)
bufstart = swab_buffer(ibuf, &n_bytes_read);
else
bufstart = ibuf;
if (conversions_mask & C_BLOCK)
copy_with_block(bufstart, n_bytes_read);
else if (conversions_mask & C_UNBLOCK)
copy_with_unblock(bufstart, n_bytes_read);
else
copy_simple(bufstart, n_bytes_read);
}
if (do_hash && hashconv == HASHCONV_AFTER)
hash_update(ihashlist, ibuf, n_bytes_read);
}
/* If we have a char left as a result of conv=swab, output it. */
if (char_is_saved) {
if (conversions_mask & C_BLOCK)
copy_with_block(&saved_char, 1);
else if (conversions_mask & C_UNBLOCK)
copy_with_unblock(&saved_char, 1);
else
output_char(saved_char);
}
if ((conversions_mask & C_BLOCK) && col > 0) {
/* If the final input line didn't end with a '\n', pad
the output block to `conversion_blocksize' chars. */
unsigned int i;
for (i = col; i < conversion_blocksize; i++)
output_char(space_character);
}
if ((conversions_mask & C_UNBLOCK) && col == conversion_blocksize)
/* Add a final '\n' if there are exactly `conversion_blocksize'
characters in the final record. */
output_char(newline_character);
/* Write out the last block. */
if (oc != 0) {
/* int nwritten = full_write(STDOUT_FILENO, obuf, oc); */
int nwritten = outputlist_write(obuf, oc);
if (nwritten > 0)
w_partial++;
if (nwritten < 0) {
syscall_error(output_file);
}
}
free(real_buf);
if (real_obuf)
free(real_obuf);
if (do_hash) {
hash_remainder(ihashlist, WINDOW_CTX);
display_totalhash(ihashlist, TOTAL_CTX);
}
return exit_status;
}
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