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/* sum -- checksum and count the blocks in a file
Copyright (C) 1986-2023 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 3 of the License, 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, see <https://www.gnu.org/licenses/>. */
/* Like BSD sum or SysV sum -r, except like SysV sum if -s option is given. */
/* Written by Kayvan Aghaiepour and David MacKenzie. */
#include <config.h>
#include <stdio.h>
#include <sys/types.h>
#include "system.h"
#include "human.h"
#include "sum.h"
#include <byteswap.h>
#ifdef WORDS_BIGENDIAN
# define SWAP(n) (n)
#else
# define SWAP(n) bswap_16 (n)
#endif
/* Calculate the checksum and the size in bytes of stream STREAM.
Return -1 on error, 0 on success. */
int
bsd_sum_stream (FILE *stream, void *resstream, uintmax_t *length)
{
int ret = -1;
size_t sum, n;
int checksum = 0; /* The checksum mod 2^16. */
uintmax_t total_bytes = 0; /* The number of bytes. */
static const size_t buffer_length = 32768;
uint8_t *buffer = malloc (buffer_length);
if (! buffer)
return -1;
/* Process file */
while (true)
{
sum = 0;
/* Read block */
while (true)
{
n = fread (buffer + sum, 1, buffer_length - sum, stream);
sum += n;
if (buffer_length == sum)
break;
if (n == 0)
{
if (ferror (stream))
goto cleanup_buffer;
goto final_process;
}
if (feof (stream))
goto final_process;
}
for (size_t i = 0; i < sum; i++)
{
checksum = (checksum >> 1) + ((checksum & 1) << 15);
checksum += buffer[i];
checksum &= 0xffff; /* Keep it within bounds. */
}
if (total_bytes + sum < total_bytes)
{
errno = EOVERFLOW;
goto cleanup_buffer;
}
total_bytes += sum;
}
final_process:;
for (size_t i = 0; i < sum; i++)
{
checksum = (checksum >> 1) + ((checksum & 1) << 15);
checksum += buffer[i];
checksum &= 0xffff; /* Keep it within bounds. */
}
if (total_bytes + sum < total_bytes)
{
errno = EOVERFLOW;
goto cleanup_buffer;
}
total_bytes += sum;
memcpy (resstream, &checksum, sizeof checksum);
*length = total_bytes;
ret = 0;
cleanup_buffer:
free (buffer);
return ret;
}
/* Calculate the checksum and the size in bytes of stream STREAM.
Return -1 on error, 0 on success. */
int
sysv_sum_stream (FILE *stream, void *resstream, uintmax_t *length)
{
int ret = -1;
size_t sum, n;
uintmax_t total_bytes = 0;
static const size_t buffer_length = 32768;
uint8_t *buffer = malloc (buffer_length);
if (! buffer)
return -1;
/* The sum of all the input bytes, modulo (UINT_MAX + 1). */
unsigned int s = 0;
/* Process file */
while (true)
{
sum = 0;
/* Read block */
while (true)
{
n = fread (buffer + sum, 1, buffer_length - sum, stream);
sum += n;
if (buffer_length == sum)
break;
if (n == 0)
{
if (ferror (stream))
goto cleanup_buffer;
goto final_process;
}
if (feof (stream))
goto final_process;
}
for (size_t i = 0; i < sum; i++)
s += buffer[i];
if (total_bytes + sum < total_bytes)
{
errno = EOVERFLOW;
goto cleanup_buffer;
}
total_bytes += sum;
}
final_process:;
for (size_t i = 0; i < sum; i++)
s += buffer[i];
if (total_bytes + sum < total_bytes)
{
errno = EOVERFLOW;
goto cleanup_buffer;
}
total_bytes += sum;
int r = (s & 0xffff) + ((s & 0xffffffff) >> 16);
int checksum = (r & 0xffff) + (r >> 16);
memcpy (resstream, &checksum, sizeof checksum);
*length = total_bytes;
ret = 0;
cleanup_buffer:
free (buffer);
return ret;
}
/* Print the checksum and size (in 1024 byte blocks) to stdout.
If ARGS is true, also print the FILE name. */
void
output_bsd (char const *file, int binary_file, void const *digest,
bool raw, bool tagged, unsigned char delim, bool args,
uintmax_t length)
{
if (raw)
{
/* Output in network byte order (big endian). */
uint16_t out_int = SWAP (*(uint16_t *)digest);
fwrite (&out_int, 1, 16/8, stdout);
return;
}
char hbuf[LONGEST_HUMAN_READABLE + 1];
printf ("%05d %5s", *(int *)digest,
human_readable (length, hbuf, human_ceiling, 1, 1024));
if (args)
printf (" %s", file);
putchar (delim);
}
/* Print the checksum and size (in 512 byte blocks) to stdout.
If ARGS is true, also print the FILE name. */
void
output_sysv (char const *file, int binary_file, void const *digest,
bool raw, bool tagged, unsigned char delim, bool args,
uintmax_t length)
{
if (raw)
{
/* Output in network byte order (big endian). */
uint16_t out_int = SWAP (*(uint16_t *)digest);
fwrite (&out_int, 1, 16/8, stdout);
return;
}
char hbuf[LONGEST_HUMAN_READABLE + 1];
printf ("%d %s", *(int *)digest,
human_readable (length, hbuf, human_ceiling, 1, 512));
if (args)
printf (" %s", file);
putchar (delim);
}
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