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cde/cde/programs/dtsr/huffcode.c
Peter Howkins fd3a620a68 dtsr: Resolve all -Wformat-security warnings.
2012-08-29 18:21:05 +01:00

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/*
* CDE - Common Desktop Environment
*
* Copyright (c) 1993-2012, The Open Group. All rights reserved.
*
* These libraries and programs are free software; you can
* redistribute them and/or modify them under the terms of the GNU
* Lesser General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* These libraries and programs are distributed in the hope that
* they will be useful, but WITHOUT ANY WARRANTY; without even the
* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with these librararies and programs; if not, write
* to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
* Floor, Boston, MA 02110-1301 USA
*/
/*
* COMPONENT_NAME: austext
*
* FUNCTIONS: build_tree
* char_label
* huffman_code
* init_treebase
* main
* next_sorted_node
* print_usage
* strrev
* user_args_processor
*
* ORIGINS: 27
*
*
* (C) COPYRIGHT International Business Machines Corp. 1990,1996
* All Rights Reserved
* Licensed Materials - Property of IBM
* US Government Users Restricted Rights - Use, duplication or
* disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
*/
/************************** HUFFCODE.C ******************************
* $XConsortium: huffcode.c /main/9 1996/11/14 15:31:05 rcs $
* 12/90.
* Counts frequency of occurrance of every possible byte value of input text.
* Creates Huffman Code Table based on byte frequencies and writes it
* in 2 formats to 2 different output files.
* The encode table (.huf) maintains the frequency counts and explicitly
* includes the huffman code strings. Generally speaking, the .huf file
* is intended for humans to read. The decode table (.c) is an array
* of integers meant to be compiled into an object module, then linked
* into the decode program. The .c format closely resembles the original
* huffman code tree in this program.
* By keeping the tree as an obscure array of integers,
* the huffman code can double as an encryption technique,
* and the decoding method kept somewhat proprietary.
*
* For a good discussion of Huffman codes and related algorithms,
* see "Data Compression Techniques and Applications Hardware and
* Software Considerations" by Gilbert Held and Thomas R. Marshall.
* The tree itself is balanced to minimize longest bitstring length
* per Eugene Schwartz, Information and Control 7, 37-44 (1964).
*
* At beginning of each new execution, the program tries to
* open the .huf table file and continue byte frequency counting
* from the last run.
* If the .huf file doesn't exist, the table's counts are
* initialized to zeroes. The .c decode table is recomputed fresh
* each run, whether it existed before or not.
*
* If the input file is not specified then the frequencies in the table
* are not changed, and the huffman codes are recomputed with the
* existing frequencies.
*
* THIS PROGRAM DOES NOT CHECK .HUF FILE FORMAT!--it had better be correct.
*
* HUFFMAN ENCODE TABLE (.huf) FILE FORMAT:
* Each line represents each possible byte value (0 - 255),
* the huffman 'literal' character (#256), or comments.
* There are exactly 257 lines sorted by decreasing count.
* There are four fields, each separated by one or more tabs (\t).
*
* 1. CHARACTER. a number from 0 to 256.
*
* The 'character' represented by the number 256 is the literal.
* it represents all characters whose frequency is so low that
* there is no huffman code translation--this reduces the max
* length of the coded bit string when there are lots of zero
* or low frequency bytes in the input. For example,
* pure ascii text files only occasionally have byte values
* less than 32 (control chars) and rarely greater than 127
* (high order bit turned on).
*
* 2. HUFFMAN CODE. a string of binary digits (0's and 1's).
* Each string is unique to that character.
* This field will consist of a single blank, when the character
* will be coded by the huffman literal. If the code of
* the literal itself is blank, then literal coding is
* not used in this table--all characters are represented
* by complete huffman code strings.
*
* 3. COUNT. The number of times this character appeared in the text.
* The literal's count equals the sum of the counts of all the
* real characters which are represented by the literal.
* The literal's count may be 0 if all the characters it
* represents have zero frequencies.
*
* 4. COMMENTS. A label depicting the printable char or its description.
*
* HUFFMAN DECODE TABLE (.c) FILE FORMAT:
* A sequence of integers formatted as a C array of integer pairs
* and intended to be compiled and linked into the decode program.
* Each huffman tree node contains two integers.
* The root of the tree is the LAST integer pair.
* The first (left) integer contains the array index down the '0' branch,
* the right integer points down the '1' branch.
* However if an integer is negative, the decoding ceases and the
* resulting plaintext character is the negative integer + 257,
* and will always be in the range 0 - 255, or 256 for the literal code.
*
* $Log$
* Revision 2.3 1996/03/25 18:55:04 miker
* Changed FILENAME_MAX to _POSIX_PATH_MAX.
*
* Revision 2.2 1995/10/25 17:50:34 miker
* Added prolog.
*
* Revision 2.1 1995/09/22 20:46:28 miker
* Freeze DtSearch 0.1, AusText 2.1.8
*
* Revision 1.4 1995/09/19 22:04:11 miker
* Print out nonascii chars in .huf file comments.
*
* Revision 1.3 1995/09/05 18:08:00 miker
* Name changes for DtSearch.
*/
#include "SearchP.h"
#include <limits.h>
#include <ctype.h>
#include <errno.h>
#include <locale.h>
#include <sys/stat.h>
#define MS_huff 30 /* message catalog set number */
#define DELIMITERS "\t\n" /* betw fields in .huf file */
#define LAST_BIT '-'
#define MAX_BITLEN 24
#define MAX_NODES 514
/*
* 256 chars + 'literal' char = max leaves, therefore max treesize
* = 2n - 1 = 513
*/
/*----------------------- HCTREE --------------------------*/
/* tree is also a table so tree ptrs are table indexes:
* 0 - 255 = characters themselves (leaves at base of tree).
* 256 = literal code (special char/leaf).
* > 256 = higher nodes.
* Global 'last_node' = highest actual node alloc so far.
* When tree completed, last_node = root of tree.
* -1 = null links.
*/
typedef struct {
char bit; /* '0' or '1' (assoc with link to
* father) */
long count; /* freq of occurrance of char */
int sort; /* specifies output sort order */
int father; /* index points UP toward root of
* tree */
int son0; /* index of '0' (left) subnode */
int son1; /* index of '1' (right) subnode */
} HCTREE;
/*------------------------ GLOBALS ---------------------------*/
static int last_node = 256;
long total_count;
long literal_threshold = 0L;
int debug_switch = FALSE;
int literal_coding_on = TRUE;
int input_file_specified; /* TRUE if user enters
* filename */
int no_huffcode_file; /* TRUE if table file not
* found */
HCTREE hctree1[MAX_NODES];
char filename_input[_POSIX_PATH_MAX];
char filename_huf[_POSIX_PATH_MAX];
char filename_huc[_POSIX_PATH_MAX];
#ifndef TURBO_COMPILER
/****************************************/
/* */
/* strrev */
/* */
/****************************************/
static char *strrev (char *string)
{
int i;
int j;
char temp;
for (i = 0, j = strlen (string) - 1; i < j; i++, j--) {
temp = string[i];
string[i] = string[j];
string[j] = temp;
}
return string;
}
#endif /* !TURBO_COMPILER */
/****************************************/
/* */
/* Build Tree */
/* */
/****************************************/
/* Each call joins the two nodes with smallest count
* into a single higher level node. If there are more than 2 nodes with
* similar 'smallest' counts, then within that group the 2 nodes with the
* shortest current bitstring length are joined.
* Returns TRUE for each successful lower level join.
* Returns FALSE when final join is made at highest level (root).
*/
static int build_tree (void)
{
int i, j;
int low0 = -1;
int low1 = -1;
int len0 = 0;
int len1 = 0;
int curr;
/* find 2 lowest counts */
for (i = 0; i < 257; i++) {
/* skip over real chars with counts <= 'literal' threshold */
if (literal_coding_on
&& i != 256
&& hctree1[i].count <= literal_threshold) {
hctree1[i].sort = MAX_BITLEN + 1;
continue;
}
/* skip over literal if literal coding turned off */
if (i == 256 && !literal_coding_on) {
hctree1[256].sort = MAX_BITLEN + 1;
continue;
}
/*
* Ascend to highest tree level for current table entry,
* putting length of bitstring into sort field. Save
* highest tree level in curr.
*/
hctree1[i].sort = 0;
for (j = i; j != -1; j = hctree1[j].father) {
hctree1[i].sort++;
curr = j;
}
/*
* sanity checks after ascending tree: 1. if bit strings
* have grown too large, quit. 2. if curr points to top
* tree level, quit.
*/
if (hctree1[i].sort > MAX_BITLEN) {
fprintf (stderr, "%s", catgets(dtsearch_catd, MS_huff, 30,
"\n183 Bit strings have grown too large. You probably "
"have literals\n turned off with grossly unbalanced "
"character counts.\n\7"));
exit (2);
}
if (hctree1[curr].count >= total_count) {
fprintf (stderr, "%s", catgets(dtsearch_catd, MS_huff, 31,
"\n191 Programming Error: Still trying to build\n"
" Huffman Code Tree after root created.\n\7"));
exit (2);
}
/*
* if curr ptr already joins low0 or low1, try the next
* table entry
*/
if (curr == low0 || curr == low1)
continue;
/*
* If curr count is less than low0, or if curr count = low0
* but curr bitstring length is less, replace both low0 and
* low1. (that way, we keep low0 always <= low1)
*/
if (low0 == -1 || hctree1[curr].count < hctree1[low0].count ||
(hctree1[curr].count == hctree1[low0].count && hctree1[i].sort < len0)) {
low1 = low0;
len1 = len0;
low0 = curr;
len0 = hctree1[i].sort;
continue;
}
/*
* At this point curr count is 'greater' than low0. If curr
* count is less than low1, or if curr count = low1 but
* curr bitstring length is less, replace only low1
*/
if (low1 == -1 || hctree1[curr].count < hctree1[low1].count ||
(hctree1[curr].count == hctree1[low1].count && hctree1[i].sort < len1)) {
low1 = curr;
len1 = hctree1[i].sort;
continue;
}
/*
* default: curr count is greater than BOTH low0 and low1,
* try next table entry
*/
} /* end loop to find two lowest counts */
/* low0 and low1 now point to two lowest count nodes.
* link in low0 and low1 to next available new node.
*/
last_node++;
hctree1[low0].bit = '0';
hctree1[low0].father = last_node;
hctree1[low1].bit = '1';
hctree1[low1].father = last_node;
hctree1[last_node].bit = LAST_BIT;
hctree1[last_node].father = -1;
hctree1[last_node].count = hctree1[low0].count + hctree1[low1].count;
hctree1[last_node].son0 = low0;
hctree1[last_node].son1 = low1;
if (debug_switch)
printf ("%3d: low0=%6ld\tlow1=%6ld\tsum=%6ld\t(%ld)\n",
last_node, hctree1[low0].count, hctree1[low1].count,
hctree1[last_node].count, total_count);
if (hctree1[last_node].count < total_count)
return TRUE;
else
return FALSE;
} /* end of function build_tree */
/****************************************/
/* */
/* Char Label */
/* */
/****************************************/
static char *char_label (int x)
{
static char buf[64];
switch (x) {
case 0:
return "NULL";
case 8:
return "\\b (backspace)";
case 9:
return "\\t (tab)";
case 10:
return "\\n (linefeed)";
case 11:
return "\\v (vert tab)";
case 12:
return "\\f (form feed)";
case 13:
return "\\r (carr retn)";
case 26:
return "CTRL-Z (EOF)";
case 27:
return "CTRL-[ (ESC)";
case 31:
return "CTRL-dash";
case 32:
return "SPACE (blank)";
case 45:
return "- (dash)";
case 95:
return "_ (underscore)";
case 127:
return "DEL";
case 256:
return "*** LITERAL CODE ***";
default:
if (x > 256)
return "";
else if (x < 32) {
sprintf (buf, "'CTRL-%c'", 0x40 | x);
return buf;
}
else if (x >= 128) {
strcpy (buf, catgets(dtsearch_catd, MS_huff, 32,
"(nonascii char, high bit set)"));
return buf;
}
else {
sprintf (buf, "'%c'", x);
return buf;
}
}
} /* end of function char_label */
/****************************************/
/* */
/* Next Sorted Node */
/* */
/****************************************/
/* Called repeatedly, returns the next treebase node in sorted order.
* Sort order is by length of Huffman Code String.
* Caller must pass index of last node returned (neg at first call).
* Lasti should never be larger than treebase.
*/
static int next_sorted_node (int lasti)
{
int i;
int nexti = -1;
long nextsortval = MAX_BITLEN + 2;
/* permanently mark last returned node as unavailable */
if (lasti >= 0)
hctree1[lasti].sort = MAX_BITLEN + 2;
/* find next shortest string length */
for (i = 0; i < 257; i++)
if (hctree1[i].sort < nextsortval) {
nextsortval = hctree1[i].sort;
nexti = i;
}
return nexti;
} /* end of function next_sorted_node */
/****************************************/
/* */
/* Initialize Treebase */
/* */
/****************************************/
/* 'Treebase' is original 257 character nodes (including literal code).
* If huffcode table file exists, initializes treebase with its values,
* else initializes treebase with zero counts.
*/
static void init_treebase (void)
{
int i;
FILE *instream_huf;
char filebuf[128];
total_count = 0L;
/* .huf table file does not exist--zero all counts */
if ((instream_huf = fopen (filename_huf, "r")) == NULL) {
no_huffcode_file = TRUE;
for (i = 0; i < 257; i++) {
hctree1[i].bit = LAST_BIT;
hctree1[i].count = 0L;
hctree1[i].father = -1;
hctree1[i].son0 = -1;
hctree1[i].son1 = -1;
}
}
/* Table file exists--init treebase with values from file.
* We are only interested in the character itself (i),
* and its current count. All other fields will be recreated
* at output time. FILE FORMAT IS NOT CHECKED--IT HAD BETTER BE CORRECT!
*/
else {
no_huffcode_file = FALSE;
fgets (filebuf, sizeof (filebuf) - 1, instream_huf);
/* discard this first line (don't need id stamp) */
while (fgets (filebuf, sizeof (filebuf) - 1, instream_huf)
!= NULL) {
i = atoi (strtok (filebuf, DELIMITERS)); /* char */
if (i < 0 || i > 256) {
fprintf (stderr, catgets(dtsearch_catd, MS_huff, 33,
"366 Invalid file format for %s.\n"),
filename_huf);
exit (2);
}
strtok (NULL, DELIMITERS); /* skip over current huff
* code */
hctree1[i].count = (i == 256) ?
0L : atol (strtok (NULL, DELIMITERS));
hctree1[i].bit = LAST_BIT;
hctree1[i].father = -1;
hctree1[i].son0 = -1;
hctree1[i].son1 = -1;
if (i != 256)
total_count += hctree1[i].count;
} /* endwhile loop that reads each table line */
fclose (instream_huf);
}
return;
} /* end of function init_treebase */
/****************************************/
/* */
/* Huffman Code */
/* */
/****************************************/
/* determines correct huffman code based on current counts in tree,
* writes out all to both files overlaying previous values if they existed.
*/
static void huffman_code (time_t idstamp)
{
int i; /* current char */
int lasti;
int j; /* ascends tree from i to build bit_string */
char bit_string[MAX_BITLEN + 4];
char sprintbuf[128];
char *bitptr;
FILE *outstream_huc;
FILE *outstream_huf;
/* establish the 'literal' node (char #256) count
* equal to sum of all chars whose counts are less than threshold.
*/
if (literal_coding_on) {
hctree1[256].count = 0L;
for (i = 0; i < 256; i++)
if (hctree1[i].count <= literal_threshold)
hctree1[256].count += hctree1[i].count;
}
/* build the Huffman Code tree, and determine root (last_node) */
while (build_tree ());
/* now that we know the total number of tree nodes (last_node),
* we are ready to write.
* Open both output files and verify they are not write protected.
*/
if ((outstream_huc = fopen (filename_huc, "w")) == NULL) {
fprintf (stderr, catgets(dtsearch_catd, MS_huff, 34,
"424 File '%s' failed to open for write. Is it read-only?\n"),
filename_huc);
exit (2);
}
if ((outstream_huf = fopen (filename_huf, "w")) == NULL) {
fprintf (stderr, catgets(dtsearch_catd, MS_huff, 34,
"439 File '%s' failed to open for write. Is it read-only?\n"),
filename_huf);
exit (2);
}
/* create the .c decode file (tree as integer array) */
fprintf (outstream_huc,
"#include <time.h>\n"
"char *hctree_name =\t\"%s\";\n"
"time_t hctree_id =\t%ldL;\n"
"int hctree_root =\t%d;\n"
"static int hctree_array[] = {\n",
filename_huc, idstamp, last_node - 257);
for (i = 257; i <= last_node; i++) {
fprintf (outstream_huc, "\t%4d,\t%4d%c\t/* %3d */\n",
hctree1[i].son0 - 257, hctree1[i].son1 - 257,
(i == last_node) ? ' ' : ',', /* no comma after last
* one */
i - 257); /* comment contains node number */
}
fprintf (outstream_huc, "\t};\nint *hctree =\thctree_array;\n");
fclose (outstream_huc);
/* write out the tree base (0-256) in sorted order to .huf file */
fprintf (outstream_huf, "%ld\tHCTREE_ID\n", idstamp);
for (lasti = -1; (i = next_sorted_node (lasti)) >= 0; lasti = i) {
/*
* Create huffman code digit string. j ascends tree from i
* to build string in reverse order.
*/
bitptr = bit_string;
for (j = i; j != -1; j = hctree1[j].father)
*bitptr++ = hctree1[j].bit;
*bitptr = '\0'; /* terminate reversed string */
strrev (bit_string); /* reverse the string order */
if (bit_string[1] == 0)
strcpy (bit_string, " ");
if (strlen (bit_string) < 9)
strcat (bit_string, "\t");
/* write out the line for this char */
sprintf (sprintbuf, "%d\t%s\t%ld\t%s\n",
i,
bit_string + 1, /* hop over LAST_BIT */
hctree1[i].count,
char_label (i));
fprintf (outstream_huf, "%s", sprintbuf);
} /* end forloop printing out each tree base entry */
fclose (outstream_huf);
return;
} /* end of function huffman_code */
/****************************************/
/* */
/* Print Usage */
/* */
/****************************************/
static void print_usage (void)
{
fprintf (stderr, catgets(dtsearch_catd, MS_huff, 35,
"USAGE: huffcode [-lN | -l-] [-o] <huffname> [<infile>]\n"
" -l<N> specifies the 'literal' threshold count. Any character occurring\n"
" <= <N> times will be coded with the Huffman literal. Default is -l0,\n"
" literal coding only for bytes with counts of zero.\n"
" -l- turns off literal coding. Turning off literal coding in unbalanced\n"
" trees leads to EXTREMELY LONG bit string codes--don't do it unless\n"
" the input is known to be a well balanced binary file.\n"
" -o preauthorizes overwriting any currently existing decode file.\n"
" <huffname> is the filename prefix for the Huffman Code files.\n"
" If the encode file (%s) already exists, byte counts from infile will\n"
" be added to it, otherwise it will be newly created.\n"
" The decode file (%s) is always newly created each run.\n"
" <infile> is an input file containing bytes to be counted.\n"
" It may be omitted if the encode file already exists.\n"),
EXT_HUFFCODE, EXT_HDECODE);
return;
} /* end of function print_usage */
/********************************************************/
/* */
/* USER_ARGS_PROCESSOR */
/* */
/********************************************************/
/* handles command line arguments for 'main' */
static void user_args_processor (int argc, char **argv)
{
char *argptr;
int OK_to_overwrite = FALSE;
FILE *stream;
if (argc <= 1) { /* user just wants to see usage msg */
print_usage ();
exit (1);
}
/* each pass grabs new parm of "-xxx" format */
while (--argc > 0 && (*++argv)[0] == '-') {
argptr = argv[0];
argptr[1] = tolower (argptr[1]);
switch (argptr[1]) {
case 'l': /* literal threshold */
if (argptr[2] == 0)
goto BADARG;
else if (argptr[2] == '-')
literal_coding_on = FALSE;
else
literal_threshold = atoi (argptr + 2);
break;
case 'o': /* OK_to_overwrite .c file if it already
* exists */
OK_to_overwrite = TRUE;
break;
case 'v': /* verbose mode = debug switch */
debug_switch = TRUE;
break;
BADARG:
default:
fprintf (stderr, catgets(dtsearch_catd, MS_huff, 36,
"'%s' is invalid argument.\n"), argptr);
print_usage ();
exit (2); /* ABORT program */
} /* endswitch */
} /* endwhile for cmd line '-'processing */
/* test for required tree file name */
if (argc <= 0) {
fprintf (stderr, "%s", catgets(dtsearch_catd, MS_huff, 37,
"576 Missing Huffman Code file names prefix.\n"));
print_usage ();
exit (2);
}
/* create 2 output file names from passed argument */
strncpy (filename_huf, argv[0], _POSIX_PATH_MAX);
filename_huf[_POSIX_PATH_MAX - 6] = 0;
strcat (filename_huf, EXT_HUFFCODE);
strncpy (filename_huc, argv[0], _POSIX_PATH_MAX);
filename_huc[_POSIX_PATH_MAX - 6] = 0;
strcat (filename_huc, EXT_HDECODE);
/* Since the decode file is a C source code file (.c extension),
* we want to be sure not to erase somebody's source program.
* So if the .c file already exists, and the user didn't specify
* overwrite in a command line argument, ask him now if it's OK to
* blow away the old file.
*/
if (!OK_to_overwrite)
if ((stream = fopen (filename_huc, "r")) != NULL) {
fclose (stream);
printf (catgets(dtsearch_catd, MS_huff, 38,
"Decode file '%s' already exists. "
"Is it OK to overwrite it? [y/n] "),
filename_huc);
if (toupper (getchar ()) != 'Y')
exit (2);
}
/* test for optional input file name */
if (--argc <= 0)
input_file_specified = FALSE;
else {
input_file_specified = TRUE;
strncpy (filename_input, argv[1], _POSIX_PATH_MAX);
filename_input[_POSIX_PATH_MAX - 1] = 0;
}
return;
} /* end of function user_args_processor */
/****************************************/
/* */
/* Main */
/* */
/****************************************/
int main (int argc, char *argv[])
{
FILE *instream;
struct stat fstat_input;
long bytes_in = 0L;
int mychar;
time_t now, start_stamp;
setlocale (LC_ALL, "");
dtsearch_catd = catopen (FNAME_DTSRCAT, 0);
printf (catgets(dtsearch_catd, MS_huff, 40,
"HUFFCODE Version %s\n"), AUSAPI_VERSION);
/* validate user's command line arguments */
user_args_processor (argc, argv);
/* initialize tree table, using the table file if it exists */
init_treebase ();
if (total_count == 0L)
printf ("%s", catgets(dtsearch_catd, MS_huff, 41,
"Huffman Code Tables will be newly created.\n"));
else
printf (catgets(dtsearch_catd, MS_huff, 42,
"Table '%s' already contains %ld Kbytes from previous runs.\n"),
filename_huf, total_count / 1000L);
if (!input_file_specified && no_huffcode_file) {
fprintf (stderr, catgets(dtsearch_catd, MS_huff, 43,
"645 Input file not specified and '%s' table file\n"
" doesn't exist--nothing to do!\n"),
filename_huf);
print_usage ();
exit (2);
}
/* read the input file and count its bytes */
if (input_file_specified) {
if ((instream = fopen (filename_input, "rb")) == NULL) {
BAD_INPUT_FILE:
fprintf (stderr, catgets(dtsearch_catd, MS_huff, 44,
"Could not open input file '%s' or access status: %s\n"),
filename_input, strerror (errno));
exit (2);
}
if (fstat (fileno (instream), &fstat_input) == -1)
goto BAD_INPUT_FILE;
printf (catgets(dtsearch_catd, MS_huff, 45,
"Input file '%s' contains about %ld Kbytes.\n"),
filename_input, fstat_input.st_size / 1000L);
time (&start_stamp);
while ((mychar = getc (instream)) != EOF) {
hctree1[mychar].count++;
total_count++;
/* echo progress to user every so often */
if (!(++bytes_in % 10000L))
printf (catgets(dtsearch_catd, MS_huff, 46,
"\r%ld%% done. %2ld Kbytes read. "
"Estimate %3ld seconds to completion. "),
(bytes_in * 100L) / fstat_input.st_size,
bytes_in / 1000L,
(fstat_input.st_size - bytes_in) *
(time (NULL) - start_stamp) / bytes_in);
} /* end read loop for each char in input file */
putchar ('\n');
fclose (instream);
} /* endif that processes input file */
/* build huffman code tree, write out files */
time (&now); /* this will be the official tree id time
* stamp */
printf (catgets(dtsearch_catd, MS_huff, 47,
"Identifying timestamp will be '%ld'.\n"
"%s Huffman Code Tables in '%s' and '%s'..."),
now,
(no_huffcode_file) ?
catgets(dtsearch_catd, MS_huff, 48, "Creating") :
catgets(dtsearch_catd, MS_huff, 49, "Rebuilding"),
filename_huf,
filename_huc);
huffman_code (now);
putchar ('\n');
return 0;
} /* end of function main */
/************************** HUFFCODE.C ******************************/
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