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/*
* entities.c : implementation for the XML entities handking
*
* See Copyright for the status of this software.
*
* $Id: entities.c,v 1.1 1998/08/13 03:39:04 veillard Exp $
*/
#include <stdio.h>
#include <malloc.h>
#include <string.h>
#include "entities.h"
/*
* The XML predefined entities.
*/
struct xmlPredefinedEntityValue {
const char *name;
const char *value;
};
struct xmlPredefinedEntityValue xmlPredefinedEntityValues[] = {
{ "lt", "<" },
{ "gt", ">" },
{ "apos", "'" },
{ "quot", "\"" },
{ "amp", "&" }
};
xmlEntitiesTablePtr xmlPredefinedEntities = NULL;
/*
* A buffer used for converting entities to their equivalent and back.
*/
static int buffer_size = 0;
static CHAR *buffer = NULL;
void growBuffer(void) {
buffer_size *= 2;
buffer = (CHAR *) realloc(buffer, buffer_size * sizeof(CHAR));
if (buffer == NULL) {
perror("realloc failed");
exit(1);
}
}
/*
* xmlFreeEntity : clean-up an entity record.
*/
void xmlFreeEntity(xmlEntityPtr entity) {
if (entity == NULL) return;
if (entity->name != NULL)
free((char *) entity->name);
if (entity->ExternalID != NULL)
free((char *) entity->ExternalID);
if (entity->SystemID != NULL)
free((char *) entity->SystemID);
if (entity->content != NULL)
free((char *) entity->content);
memset(entity, -1, sizeof(xmlEntity));
}
/*
* xmlAddDocEntity : register a new entity for an entities table.
*
* TODO !!! We should check here that the combination of type
* ExternalID and SystemID is valid.
*/
static void xmlAddEntity(xmlEntitiesTablePtr table, const CHAR *name, int type,
const CHAR *ExternalID, const CHAR *SystemID, CHAR *content) {
int i;
xmlEntityPtr cur;
int len;
for (i = 0;i < table->nb_entities;i++) {
cur = &table->table[i];
if (!xmlStrcmp(cur->name, name)) {
/*
* The entity is already defined in this Dtd, the spec says to NOT
* override it ... Is it worth a Warning ??? !!!
*/
return;
}
}
if (table->nb_entities >= table->max_entities) {
/*
* need more elements.
*/
table->max_entities *= 2;
table->table = (xmlEntityPtr)
realloc(table->table, table->max_entities * sizeof(xmlEntity));
if (table->table) {
perror("realloc failed");
exit(1);
}
}
cur = &table->table[table->nb_entities];
cur->name = xmlStrdup(name);
for (len = 0;name[0] != 0;name++)len++;
cur->len = len;
cur->type = type;
if (ExternalID != NULL)
cur->ExternalID = xmlStrdup(ExternalID);
else
cur->ExternalID = NULL;
if (SystemID != NULL)
cur->SystemID = xmlStrdup(SystemID);
else
cur->SystemID = NULL;
if (content != NULL)
cur->content = xmlStrdup(content);
else
cur->content = NULL;
table->nb_entities++;
}
/*
* Set up xmlPredefinedEntities from xmlPredefinedEntityValues.
*/
void xmlInitializePredefinedEntities(void) {
int i;
CHAR name[50];
CHAR value[50];
const char *in;
CHAR *out;
if (xmlPredefinedEntities != NULL) return;
xmlPredefinedEntities = xmlCreateEntitiesTable();
for (i = 0;i < sizeof(xmlPredefinedEntityValues) /
sizeof(xmlPredefinedEntityValues[0]);i++) {
in = xmlPredefinedEntityValues[i].name;
out = &name[0];
for (;(*out++ = (CHAR) *in);)in++;
in = xmlPredefinedEntityValues[i].value;
out = &value[0];
for (;(*out++ = (CHAR) *in);)in++;
xmlAddEntity(xmlPredefinedEntities, (const CHAR *) &name[0],
XML_INTERNAL_GENERAL_ENTITY, NULL, NULL,
&value[0]);
}
}
/*
* xmlAddDtdEntity : register a new entity for this DTD.
*/
void xmlAddDtdEntity(xmlDocPtr doc, const CHAR *name, int type,
const CHAR *ExternalID, const CHAR *SystemID, CHAR *content) {
xmlEntitiesTablePtr table;
if (doc->dtd == NULL) {
fprintf(stderr, "xmlAddDtdEntity: document without Dtd !\n");
return;
}
table = (xmlEntitiesTablePtr) doc->dtd->entities;
if (table == NULL) {
table = xmlCreateEntitiesTable();
doc->dtd->entities = table;
}
xmlAddEntity(table, name, type, ExternalID, SystemID, content);
}
/*
* xmlAddDocEntity : register a new entity for this document.
*/
void xmlAddDocEntity(xmlDocPtr doc, const CHAR *name, int type,
const CHAR *ExternalID, const CHAR *SystemID, CHAR *content) {
xmlEntitiesTablePtr table;
table = (xmlEntitiesTablePtr) doc->entities;
if (table == NULL) {
table = xmlCreateEntitiesTable();
doc->entities = table;
}
xmlAddEntity(doc->entities, name, type, ExternalID, SystemID, content);
}
/*
* xmlGetDtdEntity : do an entity lookup in the Dtd entity hash table and
* returns the corrsponding entity, if found, NULL otherwise.
*/
xmlEntityPtr xmlGetDtdEntity(xmlDocPtr doc, const CHAR *name) {
int i;
xmlEntityPtr cur;
xmlEntitiesTablePtr table;
if ((doc->dtd != NULL) && (doc->dtd->entities != NULL)) {
table = (xmlEntitiesTablePtr) doc->dtd->entities;
for (i = 0;i < table->nb_entities;i++) {
cur = &table->table[i];
if (!xmlStrcmp(cur->name, name)) return(cur);
}
}
return(NULL);
}
/*
* xmlGetDocEntity : do an entity lookup in the document entity hash table and
* returns the corrsponding entity, otherwise a lookup is done
* in the predefined entities too.
*/
xmlEntityPtr xmlGetDocEntity(xmlDocPtr doc, const CHAR *name) {
int i;
xmlEntityPtr cur;
xmlEntitiesTablePtr table;
if (doc->entities != NULL) {
table = (xmlEntitiesTablePtr) doc->entities;
for (i = 0;i < table->nb_entities;i++) {
cur = &table->table[i];
if (!xmlStrcmp(cur->name, name)) return(cur);
}
}
if (xmlPredefinedEntities == NULL)
xmlInitializePredefinedEntities();
table = xmlPredefinedEntities;
for (i = 0;i < table->nb_entities;i++) {
cur = &table->table[i];
if (!xmlStrcmp(cur->name, name)) return(cur);
}
return(NULL);
}
/*
* xmlEncodeEntities : do a global encoding of a string, replacing the
* basic content with their entities form.
* TODO !!!! rewite !!!
*/
CHAR *xmlEncodeEntities(xmlDocPtr doc, const CHAR *input) {
const CHAR *cur = input;
CHAR *out = buffer;
if (buffer == NULL) {
buffer_size = 1000;
buffer = (CHAR *) malloc(buffer_size * sizeof(CHAR));
if (buffer == NULL) {
perror("malloc failed");
exit(1);
}
out = buffer;
}
while (*cur != '\0') {
if (out - buffer > buffer_size - 100) {
int index = out - buffer;
growBuffer();
out = &buffer[index];
}
/*
* By default one have to encode at least '<', '>', '"' and '&' !
* One could try a better encoding using the entities defined and
* used as a compression code !!!.
*/
if (*cur == '<') {
*out++ = '&';
*out++ = 'l';
*out++ = 't';
*out++ = ';';
} else if (*cur == '>') {
*out++ = '&';
*out++ = 'g';
*out++ = 't';
*out++ = ';';
} else if (*cur == '&') {
*out++ = '&';
*out++ = 'a';
*out++ = 'm';
*out++ = 'p';
*out++ = ';';
} else if (*cur == '"') {
*out++ = '&';
*out++ = 'q';
*out++ = 'u';
*out++ = 'o';
*out++ = 't';
*out++ = ';';
} else if (*cur == '\'') {
*out++ = '&';
*out++ = 'a';
*out++ = 'p';
*out++ = 'o';
*out++ = 's';
*out++ = ';';
} else {
/*
* default case, just copy !
*/
*out++ = *cur;
}
cur++;
}
*out++ = 0;
return(buffer);
}
/*
* xmlCreateEntitiesTable : create and initialize an enmpty hash table
*/
xmlEntitiesTablePtr xmlCreateEntitiesTable(void) {
xmlEntitiesTablePtr ret;
ret = (xmlEntitiesTablePtr)
malloc(sizeof(xmlEntitiesTable));
if (ret == NULL) {
fprintf(stderr, "xmlCreateEntitiesTable : malloc(%d) failed\n",
sizeof(xmlEntitiesTable));
return(NULL);
}
ret->max_entities = XML_MIN_ENTITIES_TABLE;
ret->nb_entities = 0;
ret->table = (xmlEntityPtr )
malloc(ret->max_entities * sizeof(xmlEntity));
if (ret == NULL) {
fprintf(stderr, "xmlCreateEntitiesTable : malloc(%d) failed\n",
ret->max_entities * sizeof(xmlEntity));
free(ret);
return(NULL);
}
return(ret);
}
/*
* xmlFreeEntitiesTable : clean up and free an entities hash table.
*/
void xmlFreeEntitiesTable(xmlEntitiesTablePtr table) {
int i;
if (table == NULL) return;
for (i = 0;i < table->nb_entities;i++) {
xmlFreeEntity(&table->table[i]);
}
free(table->table);
free(table);
}
/*
* Dump the content of an entity table to the document output.
*/
void xmlDumpEntitiesTable(xmlEntitiesTablePtr table) {
int i;
xmlEntityPtr cur;
if (table == NULL) return;
for (i = 0;i < table->nb_entities;i++) {
cur = &table->table[i];
switch (cur->type) {
case XML_INTERNAL_GENERAL_ENTITY:
xmlBufferWriteChar("<!ENTITY ");
xmlBufferWriteCHAR(cur->name);
xmlBufferWriteChar(" \"");
xmlBufferWriteCHAR(cur->content);
xmlBufferWriteChar("\">\n");
break;
case XML_EXTERNAL_GENERAL_PARSED_ENTITY:
xmlBufferWriteChar("<!ENTITY ");
xmlBufferWriteCHAR(cur->name);
if (cur->ExternalID != NULL) {
xmlBufferWriteChar(" PUBLIC \"");
xmlBufferWriteCHAR(cur->ExternalID);
xmlBufferWriteChar("\" \"");
xmlBufferWriteCHAR(cur->SystemID);
xmlBufferWriteChar("\"");
} else {
xmlBufferWriteChar(" SYSTEM \"");
xmlBufferWriteCHAR(cur->SystemID);
xmlBufferWriteChar("\"");
}
xmlBufferWriteChar(">\n");
break;
case XML_EXTERNAL_GENERAL_UNPARSED_ENTITY:
xmlBufferWriteChar("<!ENTITY ");
xmlBufferWriteCHAR(cur->name);
if (cur->ExternalID != NULL) {
xmlBufferWriteChar(" PUBLIC \"");
xmlBufferWriteCHAR(cur->ExternalID);
xmlBufferWriteChar("\" \"");
xmlBufferWriteCHAR(cur->SystemID);
xmlBufferWriteChar("\"");
} else {
xmlBufferWriteChar(" SYSTEM \"");
xmlBufferWriteCHAR(cur->SystemID);
xmlBufferWriteChar("\"");
}
if (cur->content != NULL) { /* Should be true ! */
xmlBufferWriteChar(" NDATA ");
xmlBufferWriteCHAR(cur->content);
}
xmlBufferWriteChar(">\n");
break;
case XML_INTERNAL_PARAMETER_ENTITY:
xmlBufferWriteChar("<!ENTITY % ");
xmlBufferWriteCHAR(cur->name);
xmlBufferWriteChar(" \"");
xmlBufferWriteCHAR(cur->content);
xmlBufferWriteChar("\">\n");
break;
case XML_EXTERNAL_PARAMETER_ENTITY:
xmlBufferWriteChar("<!ENTITY % ");
xmlBufferWriteCHAR(cur->name);
if (cur->ExternalID != NULL) {
xmlBufferWriteChar(" PUBLIC \"");
xmlBufferWriteCHAR(cur->ExternalID);
xmlBufferWriteChar("\" \"");
xmlBufferWriteCHAR(cur->SystemID);
xmlBufferWriteChar("\"");
} else {
xmlBufferWriteChar(" SYSTEM \"");
xmlBufferWriteCHAR(cur->SystemID);
xmlBufferWriteChar("\"");
}
xmlBufferWriteChar(">\n");
break;
default:
fprintf(stderr,
"xmlDumpEntitiesTable: internal: unknown type %d\n",
cur->type);
}
}
}
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