mirror of
https://github.com/tesseract-ocr/tesseract.git
synced 2024-12-19 03:54:10 +08:00
0aa4861116
git-svn-id: https://tesseract-ocr.googlecode.com/svn/trunk@184 d0cd1f9f-072b-0410-8dd7-cf729c803f20
450 lines
13 KiB
C++
450 lines
13 KiB
C++
/* -*-C-*-
|
|
********************************************************************************
|
|
*
|
|
* File: makedawg.cpp
|
|
* Description: Create a Directed Accyclic Word Graph
|
|
* Author: Mark Seaman, OCR Technology
|
|
* Created: Fri Oct 16 14:37:00 1987
|
|
* Modified: Fri Jul 26 12:18:12 1991 (Mark Seaman) marks@hpgrlt
|
|
* Language: C
|
|
* Package: N/A
|
|
* Status: Reusable Software Component
|
|
*
|
|
* (c) Copyright 1987, Hewlett-Packard Company, all rights reserved.
|
|
** Licensed under the Apache License, Version 2.0 (the "License");
|
|
** you may not use this file except in compliance with the License.
|
|
** You may obtain a copy of the License at
|
|
** http://www.apache.org/licenses/LICENSE-2.0
|
|
** Unless required by applicable law or agreed to in writing, software
|
|
** distributed under the License is distributed on an "AS IS" BASIS,
|
|
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
** See the License for the specific language governing permissions and
|
|
** limitations under the License.
|
|
*
|
|
********************************************************************************
|
|
*/
|
|
|
|
|
|
/*
|
|
----------------------------------------------------------------------
|
|
I n c l u d e s
|
|
----------------------------------------------------------------------
|
|
*/
|
|
#ifdef __MSW32__
|
|
#include <windows.h>
|
|
#else
|
|
#include <netinet/in.h>
|
|
#endif
|
|
|
|
#include "makedawg.h"
|
|
|
|
#include "reduce.h"
|
|
#include "cutil.h"
|
|
#include "callcpp.h"
|
|
|
|
#ifdef __UNIX__
|
|
#include <assert.h>
|
|
#endif
|
|
#include <time.h>
|
|
|
|
|
|
/*
|
|
----------------------------------------------------------------------
|
|
V a r i a b l e s
|
|
----------------------------------------------------------------------
|
|
*/
|
|
|
|
/*
|
|
----------------------------------------------------------------------
|
|
F u n c t i o n s
|
|
----------------------------------------------------------------------
|
|
*/
|
|
|
|
/**********************************************************************
|
|
* build_node_map
|
|
*
|
|
* Create a node map that will help translate the indices of the DAWG
|
|
* into a compacted form.
|
|
* Construct in memory a mapping from the memory node values into the
|
|
* disk node values. Return the values in this map as requested. If
|
|
* a new value mapping is requested assign the next sequential number
|
|
* to it.
|
|
**********************************************************************/
|
|
|
|
NODE_MAP build_node_map (EDGE_ARRAY dawg,
|
|
inT32 *num_nodes,
|
|
inT32 both_links,
|
|
inT32 max_num_edges,
|
|
inT32 reserved_edges) {
|
|
EDGE_REF edge;
|
|
NODE_MAP node_map;
|
|
inT32 node_counter;
|
|
inT32 num_edges;
|
|
|
|
node_map = (NODE_MAP) malloc (sizeof (EDGE_REF) * max_num_edges);
|
|
|
|
for (edge=0; edge<max_num_edges; edge++) /* Init all slots */
|
|
node_map [edge] = -1;
|
|
|
|
if (both_links) /* Start after reserved */
|
|
node_counter = reserved_edges;
|
|
else
|
|
node_counter = num_forward_edges (dawg, 0);
|
|
|
|
*num_nodes = 0;
|
|
for (edge=0; edge<max_num_edges; edge++) { /* Search all slots */
|
|
|
|
if (forward_edge (dawg, edge)) {
|
|
(*num_nodes)++; /* Count nodes links */
|
|
|
|
node_map [edge] = (edge ? node_counter : 0);
|
|
|
|
if (both_links)
|
|
num_edges = edges_in_node (dawg, edge);
|
|
else
|
|
num_edges = num_forward_edges (dawg, edge);
|
|
|
|
if (edge != 0) node_counter += num_edges;
|
|
edge += num_edges;
|
|
if (backward_edge (dawg, edge)) edge_loop (dawg, edge);
|
|
edge--;
|
|
}
|
|
}
|
|
return (node_map);
|
|
}
|
|
|
|
|
|
/**********************************************************************
|
|
* compact_dawg
|
|
*
|
|
* Compact the DAWG (array of edges) to leave a large chunk of blank
|
|
* space at the end.
|
|
**********************************************************************/
|
|
|
|
void compact_dawg (EDGE_ARRAY dawg,
|
|
inT32 max_num_edges,
|
|
inT32 reserved_edges) {
|
|
EDGE_REF edge;
|
|
inT32 num_edges = 0;
|
|
NODE_REF next_node_space;
|
|
NODE_REF node = 0;
|
|
NODE_REF destination;
|
|
inT32 node_count;
|
|
NODE_MAP node_map;
|
|
NODE_REF the_next_node;
|
|
|
|
if (max_new_attempts < NUM_PLACEMENT_ATTEMPTS / 10) return;
|
|
max_new_attempts = 0;
|
|
|
|
print_string ("Compacting the DAWG");
|
|
node_map = build_node_map (dawg, &node_count, TRUE,
|
|
max_num_edges, reserved_edges);
|
|
|
|
edge = 0;
|
|
next_node_space = reserved_edges;
|
|
while (edge < max_num_edges) {
|
|
/* Found a node ? */
|
|
if (forward_edge (dawg, edge)) {
|
|
node = edge;
|
|
num_edges = edges_in_node (dawg, node);
|
|
/* Move the edges */
|
|
if (node != 0) {
|
|
destination = next_node_space;
|
|
if (node != next_node_space)
|
|
move_edges (dawg, node, next_node_space, num_edges);
|
|
}
|
|
else {
|
|
destination = 0;
|
|
}
|
|
/* Should be moved */
|
|
if (debug) cprintf ("Compacting node from " REFFORMAT " to " REFFORMAT \
|
|
" (%d)\n", node, destination, num_edges);
|
|
|
|
for (edge = destination;
|
|
edge < destination + num_edges;
|
|
edge++) {
|
|
|
|
the_next_node = next_node (dawg, edge);
|
|
|
|
assert (the_next_node >= 0 &&
|
|
the_next_node < max_num_edges &&
|
|
node_map [the_next_node] >= 0 &&
|
|
node_map [the_next_node] < max_num_edges);
|
|
|
|
/* Map each edge in node */
|
|
if (debug) cprintf (" " REFFORMAT " --> ", next_node (dawg, edge));
|
|
set_next_edge (dawg, edge, node_map [next_node (dawg, edge)]);
|
|
if (debug) cprintf (REFFORMAT "\n", next_node (dawg, edge));
|
|
}
|
|
|
|
if (destination != 0) next_node_space = edge;
|
|
edge = node + num_edges;
|
|
}
|
|
else {
|
|
edge++;
|
|
}
|
|
}
|
|
|
|
cprintf ("Compacting node from " REFFORMAT " to " REFFORMAT " (%d)\n",
|
|
node, next_node_space, num_edges);
|
|
free (node_map);
|
|
}
|
|
|
|
|
|
/**********************************************************************
|
|
* delete_node
|
|
*
|
|
* Remove all the edges that are currently used within this node in the
|
|
* DAWG.
|
|
**********************************************************************/
|
|
|
|
void delete_node (EDGE_ARRAY dawg,
|
|
NODE_REF node) {
|
|
EDGE_REF edge = node;
|
|
inT32 counter = edges_in_node (dawg, node);
|
|
|
|
/*
|
|
printf ("node deleted = %d (%d)\n", node, counter);
|
|
*/
|
|
while (counter--)
|
|
set_empty_edge (dawg, edge++);
|
|
}
|
|
|
|
|
|
/**********************************************************************
|
|
* write_squished_dawg
|
|
*
|
|
* Write the DAWG out to a file
|
|
**********************************************************************/
|
|
|
|
void write_squished_dawg (const char *filename,
|
|
EDGE_ARRAY dawg,
|
|
inT32 max_num_edges,
|
|
inT32 reserved_edges) {
|
|
FILE *file;
|
|
EDGE_REF edge;
|
|
inT32 num_edges;
|
|
inT32 node_count = 0;
|
|
NODE_MAP node_map;
|
|
EDGE_REF old_index;
|
|
uinT32 temp_record_32;
|
|
|
|
if (debug) print_string ("write_squished_dawg");
|
|
|
|
node_map = build_node_map (dawg, &node_count, FALSE, max_num_edges,
|
|
reserved_edges);
|
|
|
|
#ifdef WIN32
|
|
file = open_file(filename, "wb");
|
|
#else
|
|
file = open_file(filename, "w");
|
|
#endif
|
|
|
|
num_edges = 0; /* Count number of edges */
|
|
for (edge=0; edge<max_num_edges; edge++)
|
|
if (forward_edge (dawg, edge))
|
|
num_edges++;
|
|
|
|
num_edges = htonl(num_edges);
|
|
fwrite (&num_edges, sizeof (inT32), 1, file); /* Write edge count to file */
|
|
num_edges = ntohl(num_edges);
|
|
|
|
printf ("%d nodes in DAWG\n", node_count);
|
|
printf ("%d edges in DAWG\n", num_edges);
|
|
|
|
if (num_edges > MAX_NUM_EDGES_IN_SQUISHED_DAWG_FILE) {
|
|
cprintf("Error: squished DAWG is too big to be written (%d edges > %d).\n",
|
|
num_edges, MAX_NUM_EDGES_IN_SQUISHED_DAWG_FILE);
|
|
exit(1);
|
|
}
|
|
|
|
for (edge=0; edge<max_num_edges; edge++) {
|
|
/* Write forward edges */
|
|
if (forward_edge (dawg, edge)) {
|
|
do {
|
|
old_index = next_node (dawg,edge);
|
|
set_next_edge (dawg, edge, node_map [next_node (dawg, edge)]);
|
|
temp_record_32 = htonl((uinT32) edge_of (dawg,edge));
|
|
fwrite (&temp_record_32, sizeof (uinT32), 1, file);
|
|
set_next_edge (dawg, edge, old_index);
|
|
} edge_loop (dawg, edge);
|
|
|
|
if (backward_edge (dawg, edge)) /* Skip back links */
|
|
edge_loop (dawg, edge);
|
|
|
|
edge--;
|
|
}
|
|
}
|
|
|
|
free (node_map);
|
|
fclose (file);
|
|
}
|
|
|
|
#if 0
|
|
/**********************************************************************
|
|
* main
|
|
*
|
|
* Test the DAWG functions.
|
|
**********************************************************************/
|
|
|
|
main (argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
extern int optind;
|
|
extern char *optarg;
|
|
int option;
|
|
time_t start_time;
|
|
time_t end_time;
|
|
FILE *word_file;
|
|
char string [CHARS_PER_LINE];
|
|
inT32 word_count = 0;
|
|
inT32 max_num_edges = 700000;
|
|
inT32 reserved_edges = 50000;
|
|
EDGE_ARRAY dawg;
|
|
char *wordfile = "WORDS";
|
|
char *dawgfile = "DAWG";
|
|
char filename [CHARS_PER_LINE];
|
|
int baselength;
|
|
|
|
start_time = time (&start_time);
|
|
|
|
dawg = (EDGE_ARRAY) malloc (sizeof (EDGE_RECORD) * max_num_edges);
|
|
if (dawg == NULL) {
|
|
printf ("error: Could not allocate enough memory for DAWG ");
|
|
printf ("(%ld,%03ld bytes needed)\n",
|
|
sizeof (EDGE_RECORD) * max_num_edges / 1000,
|
|
sizeof (EDGE_RECORD) * max_num_edges % 1000);
|
|
exit (1);
|
|
}
|
|
|
|
if (argc > 1) {
|
|
strcpy (filename, argv[1]);
|
|
}
|
|
else {
|
|
strcpy (filename, "WORDS");
|
|
}
|
|
|
|
baselength = strlen (filename);
|
|
|
|
/* strcpy (filename+baselength, ".ful");
|
|
read_full_dawg (filename, dawg, max_num_edges);
|
|
*/
|
|
strcpy (filename+baselength, ".lst");
|
|
printf ("Building Dawg from word list in file, '%s'\n", filename);
|
|
read_word_list (filename, dawg, max_num_edges, reserved_edges);
|
|
|
|
strcpy (filename+baselength, ".ful");
|
|
printf ("Writing full Trie file, '%s'\n", filename);
|
|
write_full_dawg (filename, dawg, max_num_edges);
|
|
|
|
strcpy (filename+baselength, ".opt");
|
|
trie_to_dawg (dawg, max_num_edges, reserved_edges);
|
|
printf ("Writing full DAWG file, '%s'\n", filename);
|
|
write_full_dawg (filename, dawg, max_num_edges);
|
|
|
|
strcpy (filename+baselength, ".squ");
|
|
printf ("Writing squished file, '%s'\n", filename);
|
|
write_squished_dawg (filename, dawg, max_num_edges, reserved_edges);
|
|
|
|
end_time = time (&end_time);
|
|
printf ("Seconds Elapsed = %4.1lf\n",
|
|
difftime (end_time, start_time));
|
|
|
|
|
|
while ((option = getopt (argc, argv, "e:c:d:n:s:t:v")) != EOF)
|
|
switch (option) {
|
|
|
|
case 'c' : {
|
|
printf ("makedawg -c %s %s\n", optarg, argv[optind]);
|
|
|
|
printf ("Reading Dawg file, '%s'\n", optarg);
|
|
read_dawg (optarg, dawg, max_num_edges);
|
|
|
|
max_new_attempts = 1000;
|
|
compact_dawg (dawg, max_num_edges, reserved_edges);
|
|
|
|
printf ("Writing full file, '%s'\n", argv[optind]);
|
|
write_full_dawg (argv[optind++], dawg, max_num_edges);
|
|
|
|
break;
|
|
}
|
|
|
|
case 'd' : {
|
|
printf ("makedawg -d %s %s\n", optarg, argv[optind]);
|
|
|
|
printf ("Reading Dawg file, '%s'\n", optarg);
|
|
read_dawg (optarg, dawg, max_num_edges);
|
|
trie_to_dawg (dawg, max_num_edges, reserved_edges);
|
|
|
|
printf ("Writing full file, '%s'\n", argv[optind]);
|
|
write_full_dawg (argv[optind++], dawg, max_num_edges);
|
|
|
|
break;
|
|
}
|
|
|
|
case 'n' : {
|
|
printf ("makedawg -n %s %s\n", optarg, argv[optind]);
|
|
|
|
printf ("Building Dawg from word list in file, '%s'\n", optarg);
|
|
read_word_list (optarg, dawg, max_num_edges, reserved_edges);
|
|
|
|
printf ("Writing full Dawg file, '%s'\n", argv[optind]);
|
|
write_full_dawg (argv[optind++], dawg, max_num_edges);
|
|
|
|
break;
|
|
}
|
|
|
|
case 's' : {
|
|
printf ("makedawg -s %s %s\n", optarg, argv[optind]);
|
|
|
|
printf ("Reading Dawg file, '%s'\n", optarg);
|
|
read_dawg (optarg, dawg, max_num_edges);
|
|
|
|
printf ("Writing squished file, '%s'\n", argv[optind]);
|
|
write_squished_dawg (argv[optind++], dawg, max_num_edges, reserved_edges);
|
|
|
|
break;
|
|
}
|
|
|
|
case 'v' : {
|
|
debug = 1;
|
|
break;
|
|
}
|
|
|
|
case 't' : {
|
|
read_squished_dawg (optarg, dawg, max_num_edges);
|
|
|
|
if (optind < argc)
|
|
check_for_words (dawg, argv[optind++]);
|
|
else
|
|
check_for_words (dawg, NULL);
|
|
|
|
break;
|
|
}
|
|
|
|
case 'e' : {
|
|
read_dawg (optarg, dawg, max_num_edges);
|
|
|
|
if (optind < argc)
|
|
check_for_words (dawg, argv[optind++]);
|
|
else
|
|
check_for_words (dawg, NULL);
|
|
|
|
break;
|
|
}
|
|
|
|
default : {
|
|
printf ("usage: makedawg -c <old-dawg> <new-dawg>\n");
|
|
printf (" -d <old-dawg> <new-dawg>\n");
|
|
printf (" -n <words> <dawg> \n");
|
|
printf (" -s <old-dawg> <new-dawg>\n");
|
|
printf (" -e <dawg> <words> \n");
|
|
printf (" -t <dawg> <words> \n");
|
|
printf (" -v \n");
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif
|