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hash: Fix deletion of entries during scan
Functions like xmlCleanSpecialAttr scan a hash table and possibly delete entries in the callback. xmlHashScanFull must detect such deletions and rescan the entry. This regressed when rewriting the hash table code in 4a513d56. Fixes #626.
This commit is contained in:
Nick Wellnhofer
parent
aca37d8c77
commit
a2b5c90a44
76
hash.c
76
hash.c
@ -913,15 +913,42 @@ xmlHashScan(xmlHashTablePtr hash, xmlHashScanner scan, void *data) {
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void
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xmlHashScanFull(xmlHashTablePtr hash, xmlHashScannerFull scan, void *data) {
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const xmlHashEntry *entry, *end;
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xmlHashEntry old;
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unsigned i;
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if ((hash == NULL) || (hash->size == 0) || (scan == NULL))
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return;
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/*
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* We must handle the case that a scanned entry is removed when executing
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* the callback (xmlCleanSpecialAttr and possibly other places).
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*
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* Find the start of a probe sequence to avoid scanning entries twice if
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* a deletion happens.
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*/
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entry = hash->table;
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end = &hash->table[hash->size];
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while (entry->hashValue != 0) {
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if (++entry >= end)
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entry = hash->table;
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}
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for (entry = hash->table; entry < end; entry++) {
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if ((entry->hashValue != 0) && (entry->payload != NULL))
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scan(entry->payload, data, entry->key, entry->key2, entry->key3);
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for (i = 0; i < hash->size; i++) {
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if ((entry->hashValue != 0) && (entry->payload != NULL)) {
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/*
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* Make sure to rescan after a possible deletion.
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*/
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do {
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old = *entry;
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scan(entry->payload, data, entry->key, entry->key2, entry->key3);
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} while ((entry->hashValue != 0) &&
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(entry->payload != NULL) &&
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((entry->key != old.key) ||
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(entry->key2 != old.key2) ||
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(entry->key3 != old.key3)));
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}
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if (++entry >= end)
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entry = hash->table;
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}
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}
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@ -966,22 +993,47 @@ xmlHashScanFull3(xmlHashTablePtr hash, const xmlChar *key,
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const xmlChar *key2, const xmlChar *key3,
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xmlHashScannerFull scan, void *data) {
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const xmlHashEntry *entry, *end;
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xmlHashEntry old;
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unsigned i;
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if ((hash == NULL) || (hash->size == 0) || (scan == NULL))
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return;
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/*
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* We must handle the case that a scanned entry is removed when executing
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* the callback (xmlCleanSpecialAttr and possibly other places).
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*
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* Find the start of a probe sequence to avoid scanning entries twice if
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* a deletion happens.
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*/
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entry = hash->table;
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end = &hash->table[hash->size];
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while (entry->hashValue != 0) {
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if (++entry >= end)
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entry = hash->table;
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}
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for (entry = hash->table; entry < end; entry++) {
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if (entry->hashValue == 0)
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continue;
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if (((key == NULL) ||
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(strcmp((const char *) key, (const char *) entry->key) == 0)) &&
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((key2 == NULL) || (xmlFastStrEqual(key2, entry->key2))) &&
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((key3 == NULL) || (xmlFastStrEqual(key3, entry->key3))) &&
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(entry->payload != NULL)) {
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scan(entry->payload, data, entry->key, entry->key2, entry->key3);
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for (i = 0; i < hash->size; i++) {
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if ((entry->hashValue != 0) && (entry->payload != NULL)) {
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/*
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* Make sure to rescan after a possible deletion.
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*/
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do {
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if (((key != NULL) && (strcmp((const char *) key,
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(const char *) entry->key) != 0)) ||
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((key2 != NULL) && (!xmlFastStrEqual(key2, entry->key2))) ||
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((key3 != NULL) && (!xmlFastStrEqual(key3, entry->key3))))
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break;
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old = *entry;
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scan(entry->payload, data, entry->key, entry->key2, entry->key3);
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} while ((entry->hashValue != 0) &&
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(entry->payload != NULL) &&
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((entry->key != old.key) ||
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(entry->key2 != old.key2) ||
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(entry->key3 != old.key3)));
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}
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if (++entry >= end)
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entry = hash->table;
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}
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}
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14
result/issue626.xml
Normal file
14
result/issue626.xml
Normal file
@ -0,0 +1,14 @@
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<?xml version="1.0"?>
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<!DOCTYPE doc [
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<!ATTLIST e a1 CDATA #IMPLIED>
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<!ATTLIST e a2 CDATA #IMPLIED>
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<!ATTLIST e a3 CDATA #IMPLIED>
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<!ATTLIST e a4 CDATA #IMPLIED>
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<!ATTLIST e a5 CDATA #IMPLIED>
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<!ATTLIST e a6 CDATA #IMPLIED>
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]>
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<doc>
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<!-- This tests whether xmlCleanSpecialAttr works. The attribute values
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must not be normalized. -->
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<e a1=" x x " a2=" x x " a3=" x x " a4=" x x " a5=" x x " a6=" x x "/>
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</doc>
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12
result/issue626.xml.rde
Normal file
12
result/issue626.xml.rde
Normal file
@ -0,0 +1,12 @@
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0 10 doc 0 0
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0 1 doc 0 0
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1 14 #text 0 1
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1 8 #comment 0 1 This tests whether xmlCleanSpecialAttr works. The attribute values
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must not be normalized.
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1 14 #text 0 1
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1 1 e 1 0
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1 14 #text 0 1
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0 15 doc 0 0
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12
result/issue626.xml.rdr
Normal file
12
result/issue626.xml.rdr
Normal file
@ -0,0 +1,12 @@
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0 10 doc 0 0
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0 1 doc 0 0
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1 14 #text 0 1
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1 8 #comment 0 1 This tests whether xmlCleanSpecialAttr works. The attribute values
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must not be normalized.
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1 14 #text 0 1
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1 1 e 1 0
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1 14 #text 0 1
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0 15 doc 0 0
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23
result/issue626.xml.sax
Normal file
23
result/issue626.xml.sax
Normal file
@ -0,0 +1,23 @@
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SAX.setDocumentLocator()
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SAX.startDocument()
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SAX.internalSubset(doc, , )
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SAX.attributeDecl(e, a1, 1, 3, NULL, ...)
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SAX.attributeDecl(e, a2, 1, 3, NULL, ...)
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SAX.attributeDecl(e, a3, 1, 3, NULL, ...)
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SAX.attributeDecl(e, a4, 1, 3, NULL, ...)
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SAX.attributeDecl(e, a5, 1, 3, NULL, ...)
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SAX.attributeDecl(e, a6, 1, 3, NULL, ...)
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SAX.externalSubset(doc, , )
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SAX.startElement(doc)
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SAX.characters(
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, 5)
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SAX.comment( This tests whether xmlCleanSpecialAttr works. The attribute values
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must not be normalized. )
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SAX.characters(
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, 5)
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SAX.startElement(e, a1=' x x ', a2=' x x ', a3=' x x ', a4=' x x ', a5=' x x ', a6=' x x ')
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SAX.endElement(e)
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SAX.characters(
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, 1)
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SAX.endElement(doc)
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SAX.endDocument()
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23
result/issue626.xml.sax2
Normal file
23
result/issue626.xml.sax2
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@ -0,0 +1,23 @@
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SAX.setDocumentLocator()
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SAX.startDocument()
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SAX.internalSubset(doc, , )
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SAX.attributeDecl(e, a1, 1, 3, NULL, ...)
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SAX.attributeDecl(e, a2, 1, 3, NULL, ...)
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SAX.attributeDecl(e, a3, 1, 3, NULL, ...)
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SAX.attributeDecl(e, a4, 1, 3, NULL, ...)
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SAX.attributeDecl(e, a5, 1, 3, NULL, ...)
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SAX.attributeDecl(e, a6, 1, 3, NULL, ...)
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SAX.externalSubset(doc, , )
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SAX.startElementNs(doc, NULL, NULL, 0, 0, 0)
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SAX.characters(
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, 5)
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SAX.comment( This tests whether xmlCleanSpecialAttr works. The attribute values
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must not be normalized. )
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SAX.characters(
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, 5)
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SAX.startElementNs(e, NULL, NULL, 0, 6, 0, a1=' x ...', 6, a2=' x ...', 6, a3=' x ...', 6, a4=' x ...', 6, a5=' x ...', 6, a6=' x ...', 6)
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SAX.endElementNs(e, NULL, NULL)
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SAX.characters(
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, 1)
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SAX.endElementNs(doc, NULL, NULL)
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SAX.endDocument()
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14
result/noent/issue626.xml
Normal file
14
result/noent/issue626.xml
Normal file
@ -0,0 +1,14 @@
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<?xml version="1.0"?>
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<!DOCTYPE doc [
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<!ATTLIST e a1 CDATA #IMPLIED>
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<!ATTLIST e a2 CDATA #IMPLIED>
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<!ATTLIST e a3 CDATA #IMPLIED>
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<!ATTLIST e a4 CDATA #IMPLIED>
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<!ATTLIST e a5 CDATA #IMPLIED>
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<!ATTLIST e a6 CDATA #IMPLIED>
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]>
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<doc>
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<!-- This tests whether xmlCleanSpecialAttr works. The attribute values
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must not be normalized. -->
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<e a1=" x x " a2=" x x " a3=" x x " a4=" x x " a5=" x x " a6=" x x "/>
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</doc>
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23
result/noent/issue626.xml.sax2
Normal file
23
result/noent/issue626.xml.sax2
Normal file
@ -0,0 +1,23 @@
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SAX.setDocumentLocator()
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SAX.startDocument()
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SAX.internalSubset(doc, , )
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SAX.attributeDecl(e, a1, 1, 3, NULL, ...)
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SAX.attributeDecl(e, a2, 1, 3, NULL, ...)
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SAX.attributeDecl(e, a3, 1, 3, NULL, ...)
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SAX.attributeDecl(e, a4, 1, 3, NULL, ...)
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SAX.attributeDecl(e, a5, 1, 3, NULL, ...)
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SAX.attributeDecl(e, a6, 1, 3, NULL, ...)
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SAX.externalSubset(doc, , )
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SAX.startElementNs(doc, NULL, NULL, 0, 0, 0)
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SAX.characters(
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, 5)
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SAX.comment( This tests whether xmlCleanSpecialAttr works. The attribute values
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must not be normalized. )
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SAX.characters(
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, 5)
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SAX.startElementNs(e, NULL, NULL, 0, 6, 0, a1=' x ...', 6, a2=' x ...', 6, a3=' x ...', 6, a4=' x ...', 6, a5=' x ...', 6, a6=' x ...', 6)
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SAX.endElementNs(e, NULL, NULL)
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SAX.characters(
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, 1)
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SAX.endElementNs(doc, NULL, NULL)
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SAX.endDocument()
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13
test/issue626.xml
Normal file
13
test/issue626.xml
Normal file
@ -0,0 +1,13 @@
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<!DOCTYPE doc [
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<!ATTLIST e a1 CDATA #IMPLIED>
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<!ATTLIST e a2 CDATA #IMPLIED>
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<!ATTLIST e a3 CDATA #IMPLIED>
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<!ATTLIST e a4 CDATA #IMPLIED>
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<!ATTLIST e a5 CDATA #IMPLIED>
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<!ATTLIST e a6 CDATA #IMPLIED>
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]>
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<doc>
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<!-- This tests whether xmlCleanSpecialAttr works. The attribute values
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must not be normalized. -->
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<e a1=" x x " a2=" x x " a3=" x x " a4=" x x " a5=" x x " a6=" x x "/>
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</doc>
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