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/***********************************************************************/
/* */
/* The "agrep" library for Objective Caml */
/* */
/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
/* */
/* Copyright 2002 Institut National de Recherche en Informatique et */
/* en Automatique. All rights reserved. This file is distributed */
/* under the terms of the GNU Library General Public License. */
/* */
/***********************************************************************/
/* $Id$ */
#include <stdlib.h>
#include <string.h>
#include <caml/mlvalues.h>
#include <caml/alloc.h>
#include <caml/memory.h>
typedef unsigned char uchar;
typedef unsigned int uint;
typedef unsigned long ulong;
#define BITS_PER_WORD (8 * sizeof(ulong))
#define Setbit(ptr,nbit) \
((ptr)[(nbit) / BITS_PER_WORD] |= (1UL << ((nbit) % BITS_PER_WORD)))
#define CAML_MAX_INT ((1L << (8 * sizeof(value) - 2)) - 1)
CAMLprim value caml_agrep_new_bitmatrix(value v_patlen, value v_nentries)
{
ulong nwords = (Long_val(v_patlen) + BITS_PER_WORD - 1) / BITS_PER_WORD;
ulong size = nwords * Long_val(v_nentries);
value res = caml_alloc(size, Abstract_tag);
memset((ulong *) res, 0, size * sizeof(ulong));
return res;
}
CAMLprim value caml_agrep_set_bit(value v_matrix, value v_patlen,
value v_index, value v_bitnum)
{
ulong nwords = (Long_val(v_patlen) + BITS_PER_WORD - 1) / BITS_PER_WORD;
ulong bitnum = Long_val(v_bitnum);
Setbit((ulong *) v_matrix + nwords * Long_val(v_index), bitnum);
return Val_unit;
}
unsigned char word_constituent[256] = {
/* 0 - 31 */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
/* ! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 7 8 9 : ; < = > ? */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,
/* @ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z [ \ ] ^ _ */
0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,
/* ` a b c d e f g h i j k l m n o p q r s t u v w x y z { | } ~ \127 */
0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,
/* 128-159 */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
/* */
0,0,0,0,0,0,1,0,1,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,1,0,0,0,1,1,1,0,
/* */
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,1,1,1,1,
/* */
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,1,1,1,1
};
/* Specialized versions of string matching code */
#undef WHOLE_WORD
#define FUNCTION_NAME match_0errs
#define NERRS 0
#include "skeleton.h"
#undef FUNCTION_NAME
#undef NERRS
#define FUNCTION_NAME match_1errs
#define NERRS 1
#include "skeleton.h"
#undef FUNCTION_NAME
#undef NERRS
#define FUNCTION_NAME match_2errs
#define NERRS 2
#include "skeleton.h"
#undef FUNCTION_NAME
#undef NERRS
#define FUNCTION_NAME match_3errs
#define NERRS 3
#include "skeleton.h"
#undef FUNCTION_NAME
#undef NERRS
#define WHOLE_WORD
#define FUNCTION_NAME match_word_0errs
#define NERRS 0
#include "skeleton.h"
#undef FUNCTION_NAME
#undef NERRS
#define FUNCTION_NAME match_word_1errs
#define NERRS 1
#include "skeleton.h"
#undef FUNCTION_NAME
#undef NERRS
#define FUNCTION_NAME match_word_2errs
#define NERRS 2
#include "skeleton.h"
#undef FUNCTION_NAME
#undef NERRS
#define FUNCTION_NAME match_word_3errs
#define NERRS 3
#include "skeleton.h"
#undef FUNCTION_NAME
#undef NERRS
/* General code: arbitrary errors, arbitrary pattern length */
static value match_general(ulong * table, ulong m,
ulong nerrs, int wholeword,
uchar * text, mlsize_t length)
{
ulong nwords, n, j;
ulong ** R;
ulong * Rpbefore;
ulong Found_offset, Found_mask;
ulong * Ssharp;
ulong * Rc, * Rp;
ulong carry;
ulong match_empty;
long retcode;
nwords = (m + BITS_PER_WORD - 1) / BITS_PER_WORD;
R = caml_stat_alloc((nerrs + 1) * sizeof(ulong *));
for (n = 0; n <= nerrs; n++) R[n] = caml_stat_alloc(nwords * sizeof(ulong));
Rpbefore = caml_stat_alloc(nwords * sizeof(ulong));
/* Initialize Found */
Found_offset = m / BITS_PER_WORD;
Found_mask = 1UL << (m % BITS_PER_WORD);
/* Initialize R */
for (n = 0; n <= nerrs; n++) {
memset(R[n], 0, nwords * sizeof(ulong));
for (j = 0; j <= n; j++) Setbit(R[n], j);
}
/* Initialize Ssharp & match_empty */
Ssharp = table + 256 * nwords;
match_empty = 1;
/* Main loop */
for (/*nothing*/; length > 0; length--, text++) {
ulong * S = table + (*text) * nwords;
if (wholeword)
match_empty = word_constituent[text[0]] ^ word_constituent[text[1]];
/* Special case for 0 errors */
Rc = R[0];
carry = match_empty;
for (j = 0; j < nwords; j++) {
ulong Rcbefore = Rc[j];
ulong toshift = Rcbefore & S[j];
Rc[j] = (toshift << 1) | (Rcbefore & Ssharp[j]) | carry;
carry = toshift >> (BITS_PER_WORD - 1);
Rpbefore[j] = Rcbefore;
}
if (Rc[Found_offset] & Found_mask && match_empty)
{ retcode = 0; goto exit; }
/* General case for > 0 errors */
for (n = 1; n <= nerrs; n++) {
Rp = Rc;
Rc = R[n];
carry = match_empty;
for (j = 0; j < nwords; j++) {
ulong Rcbefore = Rc[j];
ulong toshift = (Rcbefore & S[j]) | Rpbefore[j] | Rp[j];
Rc[j] = (toshift << 1)
| Rpbefore[j]
| (Rcbefore & Ssharp[j])
| carry;
carry = toshift >> (BITS_PER_WORD - 1);
Rpbefore[j] = Rcbefore;
}
if (Rc[Found_offset] & Found_mask && match_empty)
{ retcode = n; goto exit; }
}
}
/* Not found */
retcode = CAML_MAX_INT;
/* Cleanup */
exit:
for (n = 0; n <= nerrs; n++) caml_stat_free(R[n]);
caml_stat_free(R);
caml_stat_free(Rpbefore);
return Val_long(retcode);
}
/* Entry point */
CAMLprim value caml_agrep_match(value v_text, value v_ofs, value v_len,
value v_patlen, value v_table,
value v_nerrs, value v_wholeword)
{
uchar * text = &Byte_u(v_text, Long_val(v_ofs));
mlsize_t len = Long_val(v_len);
ulong patlen = Long_val(v_patlen);
if (patlen < BITS_PER_WORD) {
switch (((Long_val(v_nerrs)) << 1) | Int_val(v_wholeword)) {
case 2*0+0: return match_0errs((ulong *) v_table, patlen, text, len);
case 2*0+1: return match_word_0errs((ulong *) v_table, patlen, text, len);
case 2*1+0: return match_1errs((ulong *) v_table, patlen, text, len);
case 2*1+1: return match_word_1errs((ulong *) v_table, patlen, text, len);
case 2*2+0: return match_2errs((ulong *) v_table, patlen, text, len);
case 2*2+1: return match_word_2errs((ulong *) v_table, patlen, text, len);
case 2*3+0: return match_3errs((ulong *) v_table, patlen, text, len);
case 2*3+1: return match_word_3errs((ulong *) v_table, patlen, text, len);
}
}
return match_general((ulong *) v_table, patlen,
Long_val(v_nerrs), Int_val(v_wholeword),
text, len);
}
CAMLprim value caml_agrep_match_bytecode(value * argv, int argn)
{
return caml_agrep_match(argv[0], argv[1], argv[2], argv[3], argv[4],
argv[5], argv[6]);
}
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