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CompressedDic.cpp
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CompressedDic.cpp
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/*
* Unitex
*
* Copyright (C) 2001-2017 Université Paris-Est Marne-la-Vallée <unitex@univ-mlv.fr>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
*/
#include "CompressedDic.h"
#include "Error.h"
#include "AbstractAllocator.h"
#include "File.h"
#include "Ustring.h"
#include "StringParsing.h"
#include "List_ustring.h"
#include "LoadInf.h"
#include "AbstractDelaLoad.h"
#include "Persistence.h"
#ifndef HAS_UNITEX_NAMESPACE
#define HAS_UNITEX_NAMESPACE 1
#endif
namespace unitex {
static int read_bin_header(Dictionary*);
/**
* return 1 if Bin data is a classic bin which need inf file
*/
int isDictionaryNeedInf(const unsigned char* binData, size_t binSize)
{
if (binSize<5) {
return 0;
}
Dictionary d;
d.bin=binData;
d.bin_size=(long)binSize;
if (!read_bin_header(&d)) {
return 0;
}
return (d.type==BIN_CLASSIC) ? 1 : 0;
}
/**
* Loads and returns a compressed dictionary.
*/
Dictionary* new_Dictionary(const VersatileEncodingConfig* vec,const char* bin,const char* inf,Abstract_allocator prv_alloc) {
void* ptr=get_persistent_structure(bin);
if (ptr!=NULL) {
return (Dictionary*)ptr;
}
Dictionary* d=(Dictionary*)malloc_cb(sizeof(Dictionary),prv_alloc);
if (d==NULL) {
fatal_alloc_error("new_Dictionary");
}
d->bin=load_abstract_BIN_file(bin,&d->bin_size,&d->bin_free);
if (d->bin==NULL) {
free_cb(d,prv_alloc);
return NULL;
}
if (!read_bin_header(d)) {
free_abstract_BIN(d->bin,&d->bin_free);
free_cb(d,prv_alloc);
return NULL;
}
d->inf=NULL;
if (d->type==BIN_CLASSIC) {
if (inf==NULL) {
error("NULL .inf file in new_Dictionary\n");
free_abstract_BIN(d->bin,&d->bin_free);
free_cb(d,prv_alloc);
return NULL;
}
d->inf=load_abstract_INF_file(vec,inf,&d->inf_free);
if (d->inf==NULL) {
free_abstract_BIN(d->bin,&d->bin_free);
free_cb(d,prv_alloc);
return NULL;
}
}
return d;
}
/**
* Loads and returns a compressed dictionary, but no need to specify the .inf file
* that is deduced from 'bin'.
*/
Dictionary* new_Dictionary(const VersatileEncodingConfig* vec,const char* bin,Abstract_allocator prv_alloc) {
char inf[FILENAME_MAX];
remove_extension(bin,inf);
strcat(inf,".inf");
return new_Dictionary(vec,bin,inf,prv_alloc);
}
/**
* Frees all resources associated to the given dictionary
*/
void free_Dictionary(Dictionary* d,Abstract_allocator prv_alloc) {
if (d==NULL || is_persistent_structure(d)) return;
if (d->bin!=NULL) free_abstract_BIN(d->bin,&d->bin_free);
if (d->inf!=NULL) {
free_abstract_INF(d->inf,&d->inf_free);
}
free_cb(d,prv_alloc);
}
/**
* Reads a 2 byte-value. Updates the offset.
*/
static int bin_read_2bytes(const unsigned char* bin,int *offset) {
const unsigned char* bindata=bin+(*offset);
int v=(((int)bindata[0])<<8) | bindata[1];
(*offset)+=2;
return v;
}
/**
* Reads a 3 byte-value. Updates the offset.
*/
static int bin_read_3bytes(const unsigned char* bin,int *offset) {
const unsigned char* bindata=bin+(*offset);
int v=(((int)bindata[0])<<16) | (((int)bindata[1])<<8) | bindata[2];
(*offset)+=3;
return v;
}
/**
* Reads a 4 byte-value. Updates the offset.
*/
static int bin_read_4bytes(const unsigned char* bin,int *offset) {
const unsigned char* bindata=bin+(*offset);
int v=(((int)bindata[0])<<24) | (((int)bindata[1])<<16) | (((int)bindata[2])<<8) | bindata[3];
(*offset)+=4;
return v;
}
/**
* Reads a variable length value. Updates the offset.
*/
static const unsigned int mask_from_sizebits[]={ 0x7f,0x7f,0x7f,0x7f, 0x1fff,0x1fffff,0x1fffffff,0xffffffff };
static int bin_read_variable_length (const unsigned char* bin,int *offset) {
const unsigned char* bindata=bin+(*offset);
unsigned char c0=bindata[0];
if ((c0 & 0x80)==0)
{
(*offset)++;
return (c0);
}
(*offset)+=(c0>>5)-2;
return ((c0 & 0x80) == 0) ? ((int)c0) :
(int)(((c0 & 0x1f) | (((unsigned int)bindata[1])<<5) | (((unsigned int)bindata[2])<<13) |
(((unsigned int)bindata[3])<<21) | (((unsigned int)bindata[4])<<29))
& mask_from_sizebits[c0>>5]);
}
/**
* Writes a variable length value. Updates the offset.
*/
int bin_get_value_variable_length(int value) {
unsigned int uivalue=(unsigned int)value;
if (uivalue == ((uivalue) & 0x7f)) {
return 1;
}
if (uivalue == ((uivalue) & 0x1fff)) {
return 2;
}
if (uivalue == ((uivalue) & 0x1fffff)) {
return 3;
}
if (uivalue == ((uivalue) & 0x1fffffff)) {
return 4;
}
return 5;
}
static void bin_write_variable_length(unsigned char* bin,int value,int *offset) {
unsigned char* bindata=bin+(*offset);
unsigned int uivalue=(unsigned int)value;
if (uivalue == ((uivalue) & 0x7f)) {
bindata[0]=(unsigned char)((uivalue));
(*offset)+=1;
return;
}
if (uivalue == ((uivalue) & 0x1fff)) {
bindata[1]=(unsigned char)((uivalue>>5));
bindata[0]=(unsigned char)((uivalue & 0x1f)| ((unsigned char)0x80));
(*offset)+=2;
return;
}
if (uivalue == ((uivalue) & 0x1fffff)) {
bindata[0]=(unsigned char)((uivalue & 0x1f)| ((unsigned char)0xa0));
bindata[1]=(unsigned char)((uivalue>>5));
bindata[2]=(unsigned char)((uivalue>>13));
(*offset)+=3;
return;
}
if (uivalue == ((uivalue) & 0x1fffffff)) {
bindata[0]=(unsigned char)((uivalue & 0x1f)| ((unsigned char)0xc0));
bindata[1]=(unsigned char)((uivalue>>5));
bindata[2]=(unsigned char)((uivalue>>13));
bindata[3]=(unsigned char)((uivalue>>21));
(*offset)+=4;
return;
}
bindata[0]=(unsigned char)((uivalue & 0x1f)| ((unsigned char)0xe0));
bindata[1]=(unsigned char)((uivalue>>5));
bindata[2]=(unsigned char)((uivalue>>13));
bindata[3]=(unsigned char)((uivalue>>21));
bindata[4]=(unsigned char)((uivalue>>29));
(*offset)+=5;
}
/**
* Select the bin_read_* function for a BinEncoding
*/
static t_fnc_bin_read_bytes get_bin_read_function_for_encoding(BinEncoding e) {
switch (e) {
case BIN_2BYTES: return &bin_read_2bytes;
case BIN_3BYTES: return &bin_read_3bytes;
case BIN_4BYTES: return &bin_read_4bytes;
case BIN_VARIABLE: return &bin_read_variable_length;
default: fatal_error("Illegal encoding value in get_bin_read_function_for_encoding\n");
}
return NULL;
}
/**
* Writes a 2 byte-value. Updates the offset.
*/
static void bin_write_2bytes(unsigned char* bin,int value,int *offset) {
unsigned char* bindata=bin+(*offset);
bindata[0]=(value>>8) & 255;
bindata[1]=value & 255;
(*offset)+=2;
}
/**
* Writes a 3 byte-value. Updates the offset.
*/
static void bin_write_3bytes(unsigned char* bin,int value,int *offset) {
unsigned char* bindata=bin+(*offset);
bindata[0]=(value>>16) & 255;
bindata[1]=(value>>8) & 255;
bindata[2]=value & 255;
(*offset)+=3;
}
/**
* Writes a 4 byte-value. Updates the offset.
*/
void bin_write_4bytes(unsigned char* bin,int value,int *offset) {
unsigned char* bindata=bin+(*offset);
bindata[0]=(value>>24) & 255;
bindata[1]=(value>>16) & 255;
bindata[2]=(value>>8) & 255;
bindata[3]=value & 255;
(*offset)+=4;
}
/**
* Select the bin_write_* function for a BinEncoding
*/
t_fnc_bin_write_bytes get_bin_write_function_for_encoding(BinEncoding e) {
switch (e) {
case BIN_2BYTES: return &bin_write_2bytes;
case BIN_3BYTES: return &bin_write_3bytes;
case BIN_4BYTES: return &bin_write_4bytes;
case BIN_VARIABLE: return &bin_write_variable_length;
default: fatal_error("Illegal encoding value in get_bin_write_function_for_encoding\n");
}
return NULL;
}
/**
* Reads the information associated to the current state in the dictionary, i.e.
* finality and number of outgoing transitions. Returns the new position.
* If the state is final and if it is a classic .bin, we store the inf code
* in *code.
*/
int read_dictionary_state(const Dictionary* d,int pos,int *final,int *n_transitions,int *code) {
if (d->state_encoding==BIN_CLASSIC_STATE) {
*final=!(d->bin[pos] & 128);
*n_transitions=((d->bin[pos] & 127)<<8) | (d->bin[pos+1]);
pos=pos+2;
if (*final) {
*code=(d->inf_number_read_bin_func)(d->bin,&pos);
} else {
*code=-1;
}
return pos;
}
if ((d->state_encoding==BIN_NEW_STATE) || (d->state_encoding==BIN_BIN2_STATE)) {
int value=bin_read_variable_length(d->bin,&pos);
*final=value & 1;
*n_transitions=value>>1;
if (*final && d->state_encoding==BIN_NEW_STATE) {
*code=(d->inf_number_read_bin_func)(d->bin,&pos);
} else {
*code=-1;
}
return pos;
}
fatal_error("read_dictionary_state: unsupported state encoding");
return 0;
}
/**
* Writes the information associated to the current state in the dictionary, i.e.
* finality and number of outgoing transitions. Updates the position.
*/
void write_dictionary_state(unsigned char* bin,BinStateEncoding state_encoding,
t_fnc_bin_write_bytes inf_number_write_function,int *pos,int final,int n_transitions,int code) {
if (state_encoding==BIN_CLASSIC_STATE) {
int value=n_transitions & ((1<<15)-1);
if (!final) value=value | (1<<15);
bin_write_2bytes(bin,value,pos);
if (final) {
(*inf_number_write_function)(bin,code,pos);
}
return;
}
if (state_encoding!=BIN_NEW_STATE && state_encoding!=BIN_BIN2_STATE) {
fatal_error("read_dictionary_state: unsupported state encoding\n");
}
int value=(n_transitions<<1);
if (final) value=value | 1;
bin_write_variable_length(bin,value,pos);
if (final && state_encoding==BIN_NEW_STATE) {
(*inf_number_write_function)(bin,code,pos);
}
}
/**
* Reads the information associated to the current transition in the dictionary.
* Returns the new position.
*/
int read_dictionary_transition(const Dictionary* d,int pos,unichar *c,int *dest,Ustring* output) {
*c=(unichar)(d->char_read_bin_func)(d->bin,&pos);
*dest=(d->offset_read_bin_func)(d->bin,&pos);
if (d->type==BIN_CLASSIC) return pos;
if (d->type==BIN_BIN2) {
int is_output=(*dest) & 1;
(*dest)=(*dest)>>1;
if (is_output) {
int tmp;
while ((tmp=((d->char_read_bin_func)(d->bin,&pos)))!='\0') {
u_strcat(output,(unichar)tmp);
}
}
return pos;
}
fatal_error("read_dictionary_state: unsupported dictionary type\n");
return 0;
}
/**
* Writes the information associated to the current transition in the dictionary.
* Updates the position.
*/
void write_dictionary_transition(unsigned char* bin,int *pos,t_fnc_bin_write_bytes char_write_function,
t_fnc_bin_write_bytes offset_write_function,unichar c,int dest,
BinType bin_type,unichar* output) {
(*char_write_function)(bin,c,pos);
if (bin_type==BIN_CLASSIC) {
(*offset_write_function)(bin,dest,pos);
return;
}
/* For .bin2, we have a bit to indicate whether there is an output or not */
dest=dest<<1;
if (output!=NULL && output[0]!='\0') {
dest=dest|1;
}
(*offset_write_function)(bin,dest,pos);
if (dest & 1) {
int i=-1;
do {
i++;
(*char_write_function)(bin,output[i],pos);
} while (output[i]!='\0');
}
}
/**
* Returns the number of bytes required to save the given value.
*/
int bin_get_value_length(int v,BinEncoding e) {
switch (e) {
case BIN_2BYTES: return 2;
case BIN_3BYTES: return 3;
case BIN_4BYTES: return 4;
case BIN_VARIABLE: return bin_get_value_variable_length(v);
default: fatal_error("bin_get_value_length: unsupported encoding\n");
}
return -1;
}
/**
* Returns the number of bytes required to save the given value.
*/
int bin_get_value_length(int v,t_fnc_bin_write_bytes func) {
if (func==(&bin_write_2bytes)) return 2;
if (func==(&bin_write_3bytes)) return 3;
if (func==(&bin_write_variable_length)) return bin_get_value_variable_length(v);
fatal_error("bin_get_value_length: unsupported function\n");
return -1;
}
/**
* Returns the length in bytes of the given string, including the \0.
*/
int bin_get_string_length(unichar* s,BinEncoding char_encoding) {
int n=0,i=-1;
do {
i++;
n+=bin_get_value_length(s[i],char_encoding);
} while (s[i]!='\0');
return n;
}
int bin_get_string_length(unichar* s,t_fnc_bin_write_bytes char_encoding_func) {
int n=0,i=-1;
do {
i++;
n+=bin_get_value_length(s[i],char_encoding_func);
} while (s[i]!='\0');
return n;
}
static void select_bin_read_function(Dictionary* d) {
d->inf_number_read_bin_func=get_bin_read_function_for_encoding(d->inf_number_encoding);
d->char_read_bin_func=get_bin_read_function_for_encoding(d->char_encoding);
d->offset_read_bin_func=get_bin_read_function_for_encoding(d->offset_encoding);
}
/**
* This function assumes that the .bin file has already been loaded.
* It analyzes its header to determine the kind of .bin it is.
* Returns 0 in case of error; 1 otherwise.
*/
static int read_bin_header(Dictionary* d) {
if (d->bin[0]==0) {
/* Type 1: old style .bin/.inf dictionary */
d->initial_state_offset=4;
if (d->bin_size<d->initial_state_offset+2) {
/* The minimal empty dictionary is made of the header plus a 2 bytes empty state */
error("Invalid .bin size\n");
return 0;
}
/* If we have an old style .bin */
d->type=BIN_CLASSIC;
d->state_encoding=BIN_CLASSIC_STATE;
d->inf_number_encoding=BIN_3BYTES;
d->char_encoding=BIN_2BYTES;
d->offset_encoding=BIN_3BYTES;
select_bin_read_function(d);
return 1;
}
if (d->bin[0]==1) {
/* Type 2: modern style .bin/.inf dictionary with no limit on .bin size */
d->type=BIN_CLASSIC;
d->state_encoding=(BinStateEncoding)d->bin[1];
d->inf_number_encoding=(BinEncoding)d->bin[2];
d->char_encoding=(BinEncoding)d->bin[3];
d->offset_encoding=(BinEncoding)d->bin[4];
select_bin_read_function(d);
int offset=5;
d->initial_state_offset=bin_read_4bytes(d->bin,&offset);
return 1;
}
if (d->bin[0]==2) {
/* Type 3: .bin2 dictionary */
d->type=BIN_BIN2;
d->state_encoding=(BinStateEncoding)d->bin[1];
d->inf_number_encoding=(BinEncoding)d->bin[2];
d->char_encoding=(BinEncoding)d->bin[3];
d->offset_encoding=(BinEncoding)d->bin[4];
select_bin_read_function(d);
int offset=5;
d->initial_state_offset=bin_read_4bytes(d->bin,&offset);
return 1;
}
error("Unknown dictionary type: %d\n",d->bin[0]);
return 0;
}
/**
* Writes the .bin header for a v2 .bin or a .bin2
*/
void write_new_bin_header(BinType bin_type,unsigned char* bin,int *pos,BinStateEncoding state_encoding,
BinEncoding char_encoding,BinEncoding inf_number_encoding,
BinEncoding offset_encoding,int initial_state_offset) {
bin[(*pos)++]=(bin_type==BIN_CLASSIC)?1:2;
bin[(*pos)++]=(unsigned char)state_encoding;
bin[(*pos)++]=(unsigned char)inf_number_encoding;
bin[(*pos)++]=(unsigned char)char_encoding;
bin[(*pos)++]=(unsigned char)offset_encoding;
bin_write_4bytes(bin,initial_state_offset,pos);
}
/**
* Returns the current length of s or -1 if NULL.
*/
int save_output(Ustring* s) {
if (s==NULL) return -1;
return s->len;
}
/**
* If s is not NULL, sets its size to n.
*/
void restore_output(int n,Ustring* s) {
if (s!=NULL && n!=-1) {
s->len=n;
s->str[n]='\0';
}
}
/**
* This function stores in *inf_codes the inf code list associated either to the inf number
* or to the given output, if the dictionary is a .bin2 one. The function returns 1
* if *inf_codes should be freed (.bin2), 0 if not (.bin).
*/
int get_inf_codes(Dictionary* d,int inf_number,Ustring* output,struct list_ustring* *inf_codes,
int base) {
*inf_codes=NULL;
if (d->type==BIN_CLASSIC) {
if (inf_number!=-1) {
*inf_codes=d->inf->codes[inf_number];
}
return 0;
}
if (d->type!=BIN_BIN2) {
fatal_error("get_inf_codes: unsupported dictionary type\n");
}
if (output!=NULL && output->str[base]!='\0') {
*inf_codes=tokenize_compressed_info(output->str+base);
}
return 1;
}
int load_persistent_dictionary(const char* name) {
VersatileEncodingConfig vec=VEC_DEFAULT;
Dictionary* d=new_Dictionary(&vec,name);
if (d==NULL) return 0;
set_persistent_structure(name,d);
return 1;
}
void free_persistent_dictionary(const char* name) {
Dictionary* d=(Dictionary*)get_persistent_structure(name);
set_persistent_structure(name,NULL);
free_Dictionary(d);
}
} // namespace unitex