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tdepim/kmail/kmmsgdict.cpp

652 lines
16 KiB

/* kmail message dictionary */
/* Author: Ronen Tzur <rtzur@shani.net> */
#include "kmfolderindex.h"
#include "kmfolder.h"
#include "kmmsgdict.h"
#include "kmdict.h"
#include "globalsettings.h"
#include "folderstorage.h"
#include <qfileinfo.h>
#include <kdebug.h>
#include <kstaticdeleter.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <config.h>
#ifdef HAVE_BYTESWAP_H
#include <byteswap.h>
#endif
// We define functions as kmail_swap_NN so that we don't get compile errors
// on platforms where bswap_NN happens to be a function instead of a define.
/* Swap bytes in 32 bit value. */
#ifdef bswap_32
#define kmail_swap_32(x) bswap_32(x)
#else
#define kmail_swap_32(x) \
((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \
(((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24))
#endif
//-----------------------------------------------------------------------------
// Current version of the .index.ids files
#define IDS_VERSION 1002
// The asterisk at the end is important
#define IDS_HEADER "# KMail-Index-IDs V%d\n*"
/**
* @short an entry in the global message dictionary consisting of a pointer
* to a folder and the index of a message in the folder.
*/
class KMMsgDictEntry : public KMDictItem
{
public:
KMMsgDictEntry(const KMFolder *aFolder, int aIndex)
: folder( aFolder ), index( aIndex )
{}
const KMFolder *folder;
int index;
};
/**
* @short A "reverse entry", consisting of an array of DictEntry pointers.
*
* Each folder (storage) holds such an entry. That's useful for looking up the
* serial number of a message at a certain index in the folder, since that is the
* key of these entries.
*/
class KMMsgDictREntry
{
public:
KMMsgDictREntry(int size = 0)
{
array.resize(size);
memset(array.data(), 0, array.size() * sizeof(KMMsgDictEntry *)); // faster than a loop
fp = 0;
swapByteOrder = false;
baseOffset = 0;
}
~KMMsgDictREntry()
{
array.resize(0);
if (fp)
fclose(fp);
}
void set(int index, KMMsgDictEntry *entry)
{
if (index >= 0) {
int size = array.size();
if (index >= size) {
int newsize = QMAX(size + 25, index + 1);
array.resize(newsize);
for (int j = size; j < newsize; j++)
array.at(j) = 0;
}
array.at(index) = entry;
}
}
KMMsgDictEntry *get(int index)
{
if (index >= 0 && (unsigned)index < array.size())
return array.at(index);
return 0;
}
ulong getMsn(int index)
{
KMMsgDictEntry *entry = get(index);
if (entry)
return entry->key;
return 0;
}
int getRealSize()
{
int count = array.size() - 1;
while (count >= 0) {
if (array.at(count))
break;
count--;
}
return count + 1;
}
void sync()
{
fflush(fp);
}
public:
QMemArray<KMMsgDictEntry *> array;
FILE *fp;
bool swapByteOrder;
off_t baseOffset;
};
static KStaticDeleter<KMMsgDict> msgDict_sd;
KMMsgDict * KMMsgDict::m_self = 0;
//-----------------------------------------------------------------------------
KMMsgDict::KMMsgDict()
{
int lastSizeOfDict = GlobalSettings::self()->msgDictSizeHint();
lastSizeOfDict = ( lastSizeOfDict * 11 ) / 10;
GlobalSettings::self()->setMsgDictSizeHint( 0 );
dict = new KMDict( lastSizeOfDict );
nextMsgSerNum = 1;
m_self = this;
}
//-----------------------------------------------------------------------------
KMMsgDict::~KMMsgDict()
{
delete dict;
}
//-----------------------------------------------------------------------------
const KMMsgDict* KMMsgDict::instance()
{
if ( !m_self ) {
msgDict_sd.setObject( m_self, new KMMsgDict() );
}
return m_self;
}
KMMsgDict* KMMsgDict::mutableInstance()
{
if ( !m_self ) {
msgDict_sd.setObject( m_self, new KMMsgDict() );
}
return m_self;
}
//-----------------------------------------------------------------------------
unsigned long KMMsgDict::getNextMsgSerNum() {
unsigned long msn = nextMsgSerNum;
nextMsgSerNum++;
return msn;
}
void KMMsgDict::deleteRentry(KMMsgDictREntry *entry)
{
delete entry;
}
unsigned long KMMsgDict::insert(unsigned long msgSerNum,
const KMMsgBase *msg, int index)
{
unsigned long msn = msgSerNum;
if (!msn) {
msn = getNextMsgSerNum();
} else {
if (msn >= nextMsgSerNum)
nextMsgSerNum = msn + 1;
}
KMFolderIndex* folder = static_cast<KMFolderIndex*>( msg->storage() );
if ( !folder ) {
kdDebug(5006) << "KMMsgDict::insert: Cannot insert the message, "
<< "null pointer to storage. Requested serial: " << msgSerNum
<< endl;
kdDebug(5006) << " Message info: Subject: " << msg->subject() << ", To: "
<< msg->toStrip() << ", Date: " << msg->dateStr() << endl;
return 0;
}
if (index == -1)
index = folder->find(msg);
// Should not happen, indicates id file corruption
while (dict->find((long)msn)) {
msn = getNextMsgSerNum();
folder->setDirty( true ); // rewrite id file
}
// Insert into the dict. Don't use dict->replace() as we _know_
// there is no entry with the same msn, we just made sure.
KMMsgDictEntry *entry = new KMMsgDictEntry(folder->folder(), index);
dict->insert((long)msn, entry);
KMMsgDictREntry *rentry = folder->rDict();
if (!rentry) {
rentry = new KMMsgDictREntry();
folder->setRDict(rentry);
}
rentry->set(index, entry);
return msn;
}
unsigned long KMMsgDict::insert(const KMMsgBase *msg, int index)
{
unsigned long msn = msg->getMsgSerNum();
return insert(msn, msg, index);
}
//-----------------------------------------------------------------------------
void KMMsgDict::replace(unsigned long msgSerNum,
const KMMsgBase *msg, int index)
{
KMFolderIndex* folder = static_cast<KMFolderIndex*>( msg->storage() );
if ( !folder ) {
kdDebug(5006) << "KMMsgDict::replace: Cannot replace the message serial "
<< "number, null pointer to storage. Requested serial: " << msgSerNum
<< endl;
kdDebug(5006) << " Message info: Subject: " << msg->subject() << ", To: "
<< msg->toStrip() << ", Date: " << msg->dateStr() << endl;
return;
}
if ( index == -1 )
index = folder->find( msg );
remove( msgSerNum );
KMMsgDictEntry *entry = new KMMsgDictEntry( folder->folder(), index );
dict->insert( (long)msgSerNum, entry );
KMMsgDictREntry *rentry = folder->rDict();
if (!rentry) {
rentry = new KMMsgDictREntry();
folder->setRDict(rentry);
}
rentry->set(index, entry);
}
//-----------------------------------------------------------------------------
void KMMsgDict::remove(unsigned long msgSerNum)
{
long key = (long)msgSerNum;
KMMsgDictEntry *entry = (KMMsgDictEntry *)dict->find(key);
if (!entry)
return;
if (entry->folder) {
KMMsgDictREntry *rentry = entry->folder->storage()->rDict();
if (rentry)
rentry->set(entry->index, 0);
}
dict->remove((long)key);
}
unsigned long KMMsgDict::remove(const KMMsgBase *msg)
{
unsigned long msn = msg->getMsgSerNum();
remove(msn);
return msn;
}
//-----------------------------------------------------------------------------
void KMMsgDict::update(const KMMsgBase *msg, int index, int newIndex)
{
KMMsgDictREntry *rentry = msg->parent()->storage()->rDict();
if (rentry) {
KMMsgDictEntry *entry = rentry->get(index);
if (entry) {
entry->index = newIndex;
rentry->set(index, 0);
rentry->set(newIndex, entry);
}
}
}
//-----------------------------------------------------------------------------
void KMMsgDict::getLocation(unsigned long key,
KMFolder **retFolder, int *retIndex) const
{
KMMsgDictEntry *entry = (KMMsgDictEntry *)dict->find((long)key);
if (entry) {
*retFolder = (KMFolder *)entry->folder;
*retIndex = entry->index;
} else {
*retFolder = 0;
*retIndex = -1;
}
}
void KMMsgDict::getLocation(const KMMsgBase *msg,
KMFolder **retFolder, int *retIndex) const
{
getLocation(msg->getMsgSerNum(), retFolder, retIndex);
}
void KMMsgDict::getLocation( const KMMessage * msg, KMFolder * *retFolder, int * retIndex ) const
{
getLocation( msg->toMsgBase().getMsgSerNum(), retFolder, retIndex );
}
//-----------------------------------------------------------------------------
unsigned long KMMsgDict::getMsgSerNum(KMFolder *folder, int index) const
{
unsigned long msn = 0;
if ( folder ) {
KMMsgDictREntry *rentry = folder->storage()->rDict();
if (rentry)
msn = rentry->getMsn(index);
}
return msn;
}
//-----------------------------------------------------------------------------
//static
QValueList<unsigned long> KMMsgDict::serNumList(QPtrList<KMMsgBase> msgList)
{
QValueList<unsigned long> ret;
for ( unsigned int i = 0; i < msgList.count(); i++ ) {
unsigned long serNum = msgList.at(i)->getMsgSerNum();
assert( serNum );
ret.append( serNum );
}
return ret;
}
//-----------------------------------------------------------------------------
QString KMMsgDict::getFolderIdsLocation( const FolderStorage &storage )
{
return storage.indexLocation() + ".ids";
}
//-----------------------------------------------------------------------------
bool KMMsgDict::isFolderIdsOutdated( const FolderStorage &storage )
{
bool outdated = false;
QFileInfo indexInfo( storage.indexLocation() );
QFileInfo idsInfo( getFolderIdsLocation( storage ) );
if (!indexInfo.exists() || !idsInfo.exists())
outdated = true;
if (indexInfo.lastModified() > idsInfo.lastModified())
outdated = true;
return outdated;
}
//-----------------------------------------------------------------------------
int KMMsgDict::readFolderIds( FolderStorage& storage )
{
if ( isFolderIdsOutdated( storage ) )
return -1;
QString filename = getFolderIdsLocation( storage );
FILE *fp = fopen(QFile::encodeName(filename), "r+");
if (!fp)
return -1;
int version = 0;
fscanf(fp, IDS_HEADER, &version);
if (version != IDS_VERSION) {
fclose(fp);
return -1;
}
bool swapByteOrder;
Q_UINT32 byte_order;
if (!fread(&byte_order, sizeof(byte_order), 1, fp)) {
fclose(fp);
return -1;
}
swapByteOrder = (byte_order == 0x78563412);
Q_UINT32 count;
if (!fread(&count, sizeof(count), 1, fp)) {
fclose(fp);
return -1;
}
if (swapByteOrder)
count = kmail_swap_32(count);
// quick consistency check to avoid allocating huge amount of memory
// due to reading corrupt file (#71549)
long pos = ftell(fp); // store current position
fseek(fp, 0, SEEK_END);
long fileSize = ftell(fp); // how large is the file ?
fseek(fp, pos, SEEK_SET); // back to previous position
// the file must at least contain what we try to read below
if ( (fileSize - pos) < (long)(count * sizeof(Q_UINT32)) ) {
fclose(fp);
return -1;
}
KMMsgDictREntry *rentry = new KMMsgDictREntry(count);
for (unsigned int index = 0; index < count; index++) {
Q_UINT32 msn;
bool readOk = fread(&msn, sizeof(msn), 1, fp);
if (swapByteOrder)
msn = kmail_swap_32(msn);
if (!readOk || dict->find(msn)) {
for (unsigned int i = 0; i < index; i++) {
msn = rentry->getMsn(i);
dict->remove((long)msn);
}
delete rentry;
fclose(fp);
return -1;
}
//if (!msn)
//kdDebug(5006) << "Dict found zero serial number in folder " << folder->label() << endl;
// Insert into the dict. Don't use dict->replace() as we _know_
// there is no entry with the same msn, we just made sure.
KMMsgDictEntry *entry = new KMMsgDictEntry( storage.folder(), index);
dict->insert((long)msn, entry);
if (msn >= nextMsgSerNum)
nextMsgSerNum = msn + 1;
rentry->set(index, entry);
}
// Remember how many items we put into the dict this time so we can create
// it with an appropriate size next time.
GlobalSettings::setMsgDictSizeHint( GlobalSettings::msgDictSizeHint() + count );
fclose(fp);
storage.setRDict(rentry);
return 0;
}
//-----------------------------------------------------------------------------
KMMsgDictREntry *KMMsgDict::openFolderIds( const FolderStorage& storage, bool truncate)
{
KMMsgDictREntry *rentry = storage.rDict();
if (!rentry) {
rentry = new KMMsgDictREntry();
storage.setRDict(rentry);
}
if (!rentry->fp) {
QString filename = getFolderIdsLocation( storage );
FILE *fp = truncate ? 0 : fopen(QFile::encodeName(filename), "r+");
if (fp)
{
int version = 0;
fscanf(fp, IDS_HEADER, &version);
if (version == IDS_VERSION)
{
Q_UINT32 byte_order = 0;
fread(&byte_order, sizeof(byte_order), 1, fp);
rentry->swapByteOrder = (byte_order == 0x78563412);
}
else
{
fclose(fp);
fp = 0;
}
}
if (!fp)
{
fp = fopen(QFile::encodeName(filename), "w+");
if (!fp)
{
kdDebug(5006) << "Dict '" << filename
<< "' cannot open with folder " << storage.label() << ": "
<< strerror(errno) << " (" << errno << ")" << endl;
delete rentry;
rentry = 0;
return 0;
}
fprintf(fp, IDS_HEADER, IDS_VERSION);
Q_UINT32 byteOrder = 0x12345678;
fwrite(&byteOrder, sizeof(byteOrder), 1, fp);
rentry->swapByteOrder = false;
}
rentry->baseOffset = ftell(fp);
rentry->fp = fp;
}
return rentry;
}
//-----------------------------------------------------------------------------
int KMMsgDict::writeFolderIds( const FolderStorage &storage )
{
KMMsgDictREntry *rentry = openFolderIds( storage, true );
if (!rentry)
return 0;
FILE *fp = rentry->fp;
fseek(fp, rentry->baseOffset, SEEK_SET);
// kdDebug(5006) << "Dict writing for folder " << storage.label() << endl;
Q_UINT32 count = rentry->getRealSize();
if (!fwrite(&count, sizeof(count), 1, fp)) {
kdDebug(5006) << "Dict cannot write count with folder " << storage.label() << ": "
<< strerror(errno) << " (" << errno << ")" << endl;
return -1;
}
for (unsigned int index = 0; index < count; index++) {
Q_UINT32 msn = rentry->getMsn(index);
if (!fwrite(&msn, sizeof(msn), 1, fp))
return -1;
}
rentry->sync();
off_t eof = ftell(fp);
QString filename = getFolderIdsLocation( storage );
truncate(QFile::encodeName(filename), eof);
fclose(rentry->fp);
rentry->fp = 0;
return 0;
}
//-----------------------------------------------------------------------------
int KMMsgDict::touchFolderIds( const FolderStorage &storage )
{
KMMsgDictREntry *rentry = openFolderIds( storage, false);
if (rentry) {
rentry->sync();
fclose(rentry->fp);
rentry->fp = 0;
}
return 0;
}
//-----------------------------------------------------------------------------
int KMMsgDict::appendToFolderIds( FolderStorage& storage, int index)
{
KMMsgDictREntry *rentry = openFolderIds( storage, false);
if (!rentry)
return 0;
FILE *fp = rentry->fp;
// kdDebug(5006) << "Dict appending for folder " << storage.label() << endl;
fseek(fp, rentry->baseOffset, SEEK_SET);
Q_UINT32 count;
if (!fread(&count, sizeof(count), 1, fp)) {
kdDebug(5006) << "Dict cannot read count for folder " << storage.label() << ": "
<< strerror(errno) << " (" << errno << ")" << endl;
return 0;
}
if (rentry->swapByteOrder)
count = kmail_swap_32(count);
count++;
if (rentry->swapByteOrder)
count = kmail_swap_32(count);
fseek(fp, rentry->baseOffset, SEEK_SET);
if (!fwrite(&count, sizeof(count), 1, fp)) {
kdDebug(5006) << "Dict cannot write count for folder " << storage.label() << ": "
<< strerror(errno) << " (" << errno << ")" << endl;
return 0;
}
long ofs = (count - 1) * sizeof(ulong);
if (ofs > 0)
fseek(fp, ofs, SEEK_CUR);
Q_UINT32 msn = rentry->getMsn(index);
if (rentry->swapByteOrder)
msn = kmail_swap_32(msn);
if (!fwrite(&msn, sizeof(msn), 1, fp)) {
kdDebug(5006) << "Dict cannot write count for folder " << storage.label() << ": "
<< strerror(errno) << " (" << errno << ")" << endl;
return 0;
}
rentry->sync();
fclose(rentry->fp);
rentry->fp = 0;
return 0;
}
//-----------------------------------------------------------------------------
bool KMMsgDict::hasFolderIds( const FolderStorage& storage )
{
return storage.rDict() != 0;
}
//-----------------------------------------------------------------------------
bool KMMsgDict::removeFolderIds( FolderStorage& storage )
{
storage.setRDict( 0 );
QString filename = getFolderIdsLocation( storage );
return unlink( QFile::encodeName( filename) );
}