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vdr/libsi/si.c
Klaus Schmidinger a592125294 Version 1.5.2 
- Updated the Finnish OSD texts (thanks to Rolf Ahrenberg).
- Fixed handling user activity for shutdown, which I had messed when adopting Udo's
  original patch (thanks to Udo Richter).
- Added Turkish language texts (thanks to Oktay Yolgeçen).
- Added missing rules for generating iso8859-13 font to Makefile.
- 'libsi' now converts the incoming strings into the system's character set
  according to the DVB standard. The system's character set is determined from
  the LANG environment variable. If no recognizable setting can be found, no
  conversion will take place. Note that currently only the strings received from the
  SI data stream are converted, there have not been any changes regarding displaying
  UTF-8 characters on the OSD, yet - this will follow in one of the next steps.
  With this conversion, it should now be safe to run VDR on a UTF-8 file system,
  because all incoming characters are converted to UTF-8. This will most likely
  result in wrong characters being displayed on the OSD (because there UTF-8 is
  not known, yet), but the file names should be ok (haven't tested this myself,
  though, because I don't do UTF-8 - so please be very careful when testing!).
  There's one piece of bad news here: the German pay-tv broadcaster Premiere
  apparently encodes all EPG strings as ISO8859-1, but fails to correctly mark
  these strings as such. Therefore 'libsi' (following the DVB standard) considers
  the strings to be encoded in the default ISO6937 and converts them to whatever
  the system's character set is. This, of course, results in wrong umlauts.
  On its old transponder, the ProSieben/SAT.1 channels also had their EPG data
  wrongly encoded, but apparently on the new transponder they started broadcasting
  on this month, they got it right.
2007-04-22 18:00:00 +02:00

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/***************************************************************************
* Copyright (c) 2003 by Marcel Wiesweg *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* $Id: si.c 1.18 2007/04/22 13:56:39 kls Exp $
* *
***************************************************************************/
#include "si.h"
#include <errno.h>
#include <iconv.h>
#include <malloc.h>
#include <string.h>
#include "descriptor.h"
namespace SI {
Object::Object() {
}
Object::Object(CharArray &d) : data(d) {
}
void Object::setData(const unsigned char*d, int size, bool doCopy) {
data.assign(d, size, doCopy);
}
void Object::setData(CharArray &d) {
data=d;
}
bool Object::checkSize(int offset) {
return data.checkSize(offset);
}
Section::Section(const unsigned char *data, bool doCopy) {
setData(data, getLength(data), doCopy);
}
TableId Section::getTableId() const {
return getTableId(data.getData());
}
int Section::getLength() {
return getLength(data.getData());
}
TableId Section::getTableId(const unsigned char *d) {
return (TableId)((const SectionHeader *)d)->table_id;
}
int Section::getLength(const unsigned char *d) {
return HILO(((const SectionHeader *)d)->section_length)+sizeof(SectionHeader);
}
bool CRCSection::isCRCValid() {
return CRC32::isValid((const char *)data.getData(), getLength()/*, data.FourBytes(getLength()-4)*/);
}
bool CRCSection::CheckCRCAndParse() {
if (!isCRCValid())
return false;
CheckParse();
return isValid();
}
int NumberedSection::getTableIdExtension() const {
return getTableIdExtension(data.getData());
}
int NumberedSection::getTableIdExtension(const unsigned char *d) {
return HILO(((const ExtendedSectionHeader *)d)->table_id_extension);
}
bool NumberedSection::getCurrentNextIndicator() const {
return data.getData<ExtendedSectionHeader>()->current_next_indicator;
}
int NumberedSection::getVersionNumber() const {
return data.getData<ExtendedSectionHeader>()->version_number;
}
int NumberedSection::getSectionNumber() const {
return data.getData<ExtendedSectionHeader>()->section_number;
}
int NumberedSection::getLastSectionNumber() const {
return data.getData<ExtendedSectionHeader>()->last_section_number;
}
int Descriptor::getLength() {
return getLength(data.getData());
}
DescriptorTag Descriptor::getDescriptorTag() const {
return getDescriptorTag(data.getData());
}
int Descriptor::getLength(const unsigned char *d) {
return ((const DescriptorHeader*)d)->descriptor_length+sizeof(DescriptorHeader);
}
DescriptorTag Descriptor::getDescriptorTag(const unsigned char *d) {
return (DescriptorTag)((const DescriptorHeader*)d)->descriptor_tag;
}
Descriptor *DescriptorLoop::getNext(Iterator &it) {
if (isValid() && it.i<getLength()) {
return createDescriptor(it.i, true);
}
return 0;
}
Descriptor *DescriptorLoop::getNext(Iterator &it, DescriptorTag tag, bool returnUnimplemetedDescriptor) {
Descriptor *d=0;
int len;
if (isValid() && it.i<(len=getLength())) {
const unsigned char *p=data.getData(it.i);
const unsigned char *end=p+len-it.i;
while (p < end) {
if (Descriptor::getDescriptorTag(p) == tag) {
d=createDescriptor(it.i, returnUnimplemetedDescriptor);
if (d)
break;
}
it.i+=Descriptor::getLength(p);
p+=Descriptor::getLength(p);
}
}
return d;
}
Descriptor *DescriptorLoop::getNext(Iterator &it, DescriptorTag *tags, int arrayLength, bool returnUnimplementedDescriptor) {
Descriptor *d=0;
int len;
if (isValid() && it.i<(len=getLength())) {
const unsigned char *p=data.getData(it.i);
const unsigned char *end=p+len-it.i;
while (p < end) {
for (int u=0; u<arrayLength;u++)
if (Descriptor::getDescriptorTag(p) == tags[u]) {
d=createDescriptor(it.i, returnUnimplementedDescriptor);
break;
}
if (d)
break; //length is added to it.i by createDescriptor, break here
it.i+=Descriptor::getLength(p);
p+=Descriptor::getLength(p);
}
}
return d;
}
Descriptor *DescriptorLoop::createDescriptor(int &i, bool returnUnimplemetedDescriptor) {
if (!checkSize(Descriptor::getLength(data.getData(i))))
return 0;
Descriptor *d=Descriptor::getDescriptor(data+i, domain, returnUnimplemetedDescriptor);
if (!d)
return 0;
i+=d->getLength();
d->CheckParse();
return d;
}
int DescriptorLoop::getNumberOfDescriptors() {
const unsigned char *p=data.getData();
const unsigned char *end=p+getLength();
int count=0;
while (p < end) {
count++;
p+=Descriptor::getLength(p);
}
return count;
}
DescriptorGroup::DescriptorGroup(bool del) {
array=0;
length=0;
deleteOnDesctruction=del;
}
DescriptorGroup::~DescriptorGroup() {
if (deleteOnDesctruction)
Delete();
delete[] array;
}
void DescriptorGroup::Delete() {
for (int i=0;i<length;i++)
if (array[i]!=0) {
delete array[i];
array[i]=0;
}
}
void DescriptorGroup::Add(GroupDescriptor *d) {
if (!array) {
length=d->getLastDescriptorNumber()+1;
array=new GroupDescriptor*[length]; //numbering is zero-based
for (int i=0;i<length;i++)
array[i]=0;
} else if (length != d->getLastDescriptorNumber()+1)
return; //avoid crash in case of misuse
array[d->getDescriptorNumber()]=d;
}
bool DescriptorGroup::isComplete() {
for (int i=0;i<length;i++)
if (array[i]==0)
return false;
return true;
}
char *String::getText() {
int len=getLength();
if (len < 0 || len > 4095)
return strdup("text error"); // caller will delete it!
char *data=new char(len+1);
decodeText(data, len+1);
return data;
}
char *String::getText(char *buffer, int size) {
int len=getLength();
if (len < 0 || len >= size) {
strncpy(buffer, "text error", size);
buffer[size-1] = 0;
return buffer;
}
decodeText(buffer, size);
return buffer;
}
char *String::getText(char *buffer, char *shortVersion, int sizeBuffer, int sizeShortVersion) {
int len=getLength();
if (len < 0 || len >= sizeBuffer) {
strncpy(buffer, "text error", sizeBuffer);
buffer[sizeBuffer-1] = 0;
*shortVersion = 0;
return buffer;
}
decodeText(buffer, shortVersion, sizeBuffer, sizeShortVersion);
return buffer;
}
static const char *CharacterTables1[] = {
NULL, // 0x00
"ISO8859-5", // 0x01
"ISO8859-6", // 0x02
"ISO8859-7", // 0x03
"ISO8859-8", // 0x04
"ISO8859-9", // 0x05
"ISO8859-10", // 0x06
"ISO8859-11", // 0x07
"ISO8859-12", // 0x08
"ISO8859-13", // 0x09
"ISO8859-14", // 0x0A
"ISO8859-15", // 0x0B
NULL, // 0x0C
NULL, // 0x0D
NULL, // 0x0E
NULL, // 0x0F
NULL, // 0x10
"UTF16", // 0x11
"EUC-KR", // 0x12
"GB2312", // 0x13
"GBK", // 0x14
"UTF8", // 0x15
NULL, // 0x16
NULL, // 0x17
NULL, // 0x18
NULL, // 0x19
NULL, // 0x1A
NULL, // 0x1B
NULL, // 0x1C
NULL, // 0x1D
NULL, // 0x1E
NULL, // 0x1F
};
#define SingleByteLimit 0x0B
static const char *CharacterTables2[] = {
NULL, // 0x00
"ISO8859-1", // 0x01
"ISO8859-2", // 0x02
"ISO8859-3", // 0x03
"ISO8859-4", // 0x04
"ISO8859-5", // 0x05
"ISO8859-6", // 0x06
"ISO8859-7", // 0x07
"ISO8859-8", // 0x08
"ISO8859-9", // 0x09
"ISO8859-10", // 0x0A
"ISO8859-11", // 0x0B
NULL, // 0x0C
"ISO8859-13", // 0x0D
"ISO8859-14", // 0x0E
"ISO8859-15", // 0x0F
};
#define NumEntries(Table) (sizeof(Table) / sizeof(char *))
static const char *SystemCharacterTable = NULL;
bool SystemCharacterTableIsSingleByte = true;
bool SetSystemCharacterTable(const char *CharacterTable) {
if (CharacterTable) {
for (unsigned int i = 0; i < NumEntries(CharacterTables1); i++) {
if (CharacterTables1[i] && strcasecmp(CharacterTable, CharacterTables1[i]) == 0) {
SystemCharacterTable = CharacterTables1[i];
SystemCharacterTableIsSingleByte = i <= SingleByteLimit;
return true;
}
}
for (unsigned int i = 0; i < NumEntries(CharacterTables2); i++) {
if (CharacterTables2[i] && strcasecmp(CharacterTable, CharacterTables2[i]) == 0) {
SystemCharacterTable = CharacterTables2[i];
SystemCharacterTableIsSingleByte = true;
return true;
}
}
} else {
SystemCharacterTable = NULL;
SystemCharacterTableIsSingleByte = true;
return true;
}
return false;
}
// Determines the character table used in the given buffer and returns
// a string indicating that table. If no table can be determined, the
// default ISO6937 is returned. If a table can be determined, the buffer
// and length are adjusted accordingly.
static const char *getCharacterTable(const unsigned char *&buffer, int &length, bool *isSingleByte = NULL) {
const char *cs = "ISO6937";
if (isSingleByte)
*isSingleByte = false;
if (length <= 0)
return cs;
unsigned int tag = buffer[0];
if (tag >= 0x20)
return cs;
if (tag == 0x10) {
if (length >= 3) {
tag = (buffer[1] << 8) | buffer[2];
if (tag < NumEntries(CharacterTables2) && CharacterTables2[tag]) {
buffer += 3;
length -= 3;
if (isSingleByte)
*isSingleByte = true;
return CharacterTables2[tag];
}
}
} else if (tag < NumEntries(CharacterTables1) && CharacterTables1[tag]) {
buffer += 1;
length -= 1;
if (isSingleByte)
*isSingleByte = tag <= SingleByteLimit;
return CharacterTables1[tag];
}
return cs;
}
static bool convertCharacterTable(const char *from, size_t fromLength, char *to, size_t toLength, const char *fromCode)
{
if (SystemCharacterTable) {
iconv_t cd = iconv_open(SystemCharacterTable, fromCode);
if (cd >= 0) {
char *fromPtr = (char *)from;
while (fromLength > 0 && toLength > 1) {
if (iconv(cd, &fromPtr, &fromLength, &to, &toLength) == size_t(-1)) {
if (errno == EILSEQ) {
// A character can't be converted, so mark it with '?' and proceed:
fromPtr++;
fromLength--;
*to++ = '?';
toLength--;
}
else
break;
}
}
*to = 0;
iconv_close(cd);
return true;
}
}
return false;
}
// originally from libdtv, Copyright Rolf Hakenes <hakenes@hippomi.de>
void String::decodeText(char *buffer, int size) {
const unsigned char *from=data.getData(0);
char *to=buffer;
int len=getLength();
if (len <= 0) {
*to = '\0';
return;
}
bool singleByte;
const char *cs = getCharacterTable(from, len, &singleByte);
for (int i = 0; i < len; i++) {
if (*from == 0)
break;
if ( ((' ' <= *from) && (*from <= '~'))
|| (*from == '\n')
|| (0xA0 <= *from)
|| (*from == 0x86 || *from == 0x87)
)
*to++ = *from;
else if (*from == 0x8A)
*to++ = '\n';
from++;
if (to - buffer >= size - 1)
break;
}
*to = '\0';
if (!singleByte || !SystemCharacterTableIsSingleByte) {
char convBuffer[size];
if (convertCharacterTable(buffer, strlen(buffer), convBuffer, sizeof(convBuffer), cs))
strncpy(buffer, convBuffer, strlen(convBuffer) + 1);
}
}
void String::decodeText(char *buffer, char *shortVersion, int sizeBuffer, int sizeShortVersion) {
const unsigned char *from=data.getData(0);
char *to=buffer;
char *toShort=shortVersion;
int IsShortName=0;
int len=getLength();
if (len <= 0) {
*to = '\0';
*toShort = '\0';
return;
}
bool singleByte;
const char *cs = getCharacterTable(from, len, &singleByte);
for (int i = 0; i < len; i++) {
if ( ((' ' <= *from) && (*from <= '~'))
|| (*from == '\n')
|| (0xA0 <= *from)
)
{
*to++ = *from;
if (IsShortName)
*toShort++ = *from;
}
else if (*from == 0x8A)
*to++ = '\n';
else if (*from == 0x86)
IsShortName++;
else if (*from == 0x87)
IsShortName--;
else if (*from == 0)
break;
from++;
if (to - buffer >= sizeBuffer - 1 || toShort - shortVersion >= sizeShortVersion - 1)
break;
}
*to = '\0';
*toShort = '\0';
if (!singleByte || !SystemCharacterTableIsSingleByte) {
char convBuffer[sizeBuffer];
if (convertCharacterTable(buffer, strlen(buffer), convBuffer, sizeof(convBuffer), cs))
strncpy(buffer, convBuffer, strlen(convBuffer) + 1);
char convShortVersion[sizeShortVersion];
if (convertCharacterTable(shortVersion, strlen(shortVersion), convShortVersion, sizeof(convShortVersion), cs))
strncpy(shortVersion, convShortVersion, strlen(convShortVersion) + 1);
}
}
Descriptor *Descriptor::getDescriptor(CharArray da, DescriptorTagDomain domain, bool returnUnimplemetedDescriptor) {
Descriptor *d=0;
switch (domain) {
case SI:
switch ((DescriptorTag)da.getData<DescriptorHeader>()->descriptor_tag) {
case CaDescriptorTag:
d=new CaDescriptor();
break;
case CarouselIdentifierDescriptorTag:
d=new CarouselIdentifierDescriptor();
break;
case NetworkNameDescriptorTag:
d=new NetworkNameDescriptor();
break;
case ServiceListDescriptorTag:
d=new ServiceListDescriptor();
break;
case SatelliteDeliverySystemDescriptorTag:
d=new SatelliteDeliverySystemDescriptor();
break;
case CableDeliverySystemDescriptorTag:
d=new CableDeliverySystemDescriptor();
break;
case TerrestrialDeliverySystemDescriptorTag:
d=new TerrestrialDeliverySystemDescriptor();
break;
case BouquetNameDescriptorTag:
d=new BouquetNameDescriptor();
break;
case ServiceDescriptorTag:
d=new ServiceDescriptor();
break;
case NVODReferenceDescriptorTag:
d=new NVODReferenceDescriptor();
break;
case TimeShiftedServiceDescriptorTag:
d=new TimeShiftedServiceDescriptor();
break;
case ComponentDescriptorTag:
d=new ComponentDescriptor();
break;
case StreamIdentifierDescriptorTag:
d=new StreamIdentifierDescriptor();
break;
case SubtitlingDescriptorTag:
d=new SubtitlingDescriptor();
break;
case MultilingualNetworkNameDescriptorTag:
d=new MultilingualNetworkNameDescriptor();
break;
case MultilingualBouquetNameDescriptorTag:
d=new MultilingualBouquetNameDescriptor();
break;
case MultilingualServiceNameDescriptorTag:
d=new MultilingualServiceNameDescriptor();
break;
case MultilingualComponentDescriptorTag:
d=new MultilingualComponentDescriptor();
break;
case PrivateDataSpecifierDescriptorTag:
d=new PrivateDataSpecifierDescriptor();
break;
case ServiceMoveDescriptorTag:
d=new ServiceMoveDescriptor();
break;
case FrequencyListDescriptorTag:
d=new FrequencyListDescriptor();
break;
case ServiceIdentifierDescriptorTag:
d=new ServiceIdentifierDescriptor();
break;
case CaIdentifierDescriptorTag:
d=new CaIdentifierDescriptor();
break;
case ShortEventDescriptorTag:
d=new ShortEventDescriptor();
break;
case ExtendedEventDescriptorTag:
d=new ExtendedEventDescriptor();
break;
case TimeShiftedEventDescriptorTag:
d=new TimeShiftedEventDescriptor();
break;
case ContentDescriptorTag:
d=new ContentDescriptor();
break;
case ParentalRatingDescriptorTag:
d=new ParentalRatingDescriptor();
break;
case TeletextDescriptorTag:
case VBITeletextDescriptorTag:
d=new TeletextDescriptor();
break;
case ApplicationSignallingDescriptorTag:
d=new ApplicationSignallingDescriptor();
break;
case LocalTimeOffsetDescriptorTag:
d=new LocalTimeOffsetDescriptor();
break;
case LinkageDescriptorTag:
d=new LinkageDescriptor();
break;
case ISO639LanguageDescriptorTag:
d=new ISO639LanguageDescriptor();
break;
case PDCDescriptorTag:
d=new PDCDescriptor();
break;
case AncillaryDataDescriptorTag:
d=new AncillaryDataDescriptor();
break;
case S2SatelliteDeliverySystemDescriptorTag:
d=new S2SatelliteDeliverySystemDescriptor();
break;
case ExtensionDescriptorTag:
d=new ExtensionDescriptor();
break;
//note that it is no problem to implement one
//of the unimplemented descriptors.
//defined in ISO-13818-1
case VideoStreamDescriptorTag:
case AudioStreamDescriptorTag:
case HierarchyDescriptorTag:
case RegistrationDescriptorTag:
case DataStreamAlignmentDescriptorTag:
case TargetBackgroundGridDescriptorTag:
case VideoWindowDescriptorTag:
case SystemClockDescriptorTag:
case MultiplexBufferUtilizationDescriptorTag:
case CopyrightDescriptorTag:
case MaximumBitrateDescriptorTag:
case PrivateDataIndicatorDescriptorTag:
case SmoothingBufferDescriptorTag:
case STDDescriptorTag:
case IBPDescriptorTag:
//defined in ETSI EN 300 468
case StuffingDescriptorTag:
case VBIDataDescriptorTag:
case CountryAvailabilityDescriptorTag:
case MocaicDescriptorTag:
case TelephoneDescriptorTag:
case CellListDescriptorTag:
case CellFrequencyLinkDescriptorTag:
case ServiceAvailabilityDescriptorTag:
case ShortSmoothingBufferDescriptorTag:
case PartialTransportStreamDescriptorTag:
case DataBroadcastDescriptorTag:
case DataBroadcastIdDescriptorTag:
case ScramblingDescriptorTag:
case AC3DescriptorTag:
case DSNGDescriptorTag:
case AnnouncementSupportDescriptorTag:
case AdaptationFieldDataDescriptorTag:
case TransportStreamDescriptorTag:
//defined in ETSI EN 300 468 v 1.7.1
case DefaultAuthorityDescriptorTag:
case RelatedContentDescriptorTag:
case TVAIdDescriptorTag:
case ContentIdentifierDescriptorTag:
case TimeSliceFecIdentifierDescriptorTag:
case ECMRepetitionRateDescriptorTag:
case EnhancedAC3DescriptorTag:
case DTSDescriptorTag:
case AACDescriptorTag:
default:
if (!returnUnimplemetedDescriptor)
return 0;
d=new UnimplementedDescriptor();
break;
}
break;
case MHP:
switch ((DescriptorTag)da.getData<DescriptorHeader>()->descriptor_tag) {
// They once again start with 0x00 (see page 234, MHP specification)
case MHP_ApplicationDescriptorTag:
d=new MHP_ApplicationDescriptor();
break;
case MHP_ApplicationNameDescriptorTag:
d=new MHP_ApplicationNameDescriptor();
break;
case MHP_TransportProtocolDescriptorTag:
d=new MHP_TransportProtocolDescriptor();
break;
case MHP_DVBJApplicationDescriptorTag:
d=new MHP_DVBJApplicationDescriptor();
break;
case MHP_DVBJApplicationLocationDescriptorTag:
d=new MHP_DVBJApplicationLocationDescriptor();
break;
// 0x05 - 0x0A is unimplemented this library
case MHP_ExternalApplicationAuthorisationDescriptorTag:
case MHP_IPv4RoutingDescriptorTag:
case MHP_IPv6RoutingDescriptorTag:
case MHP_DVBHTMLApplicationDescriptorTag:
case MHP_DVBHTMLApplicationLocationDescriptorTag:
case MHP_DVBHTMLApplicationBoundaryDescriptorTag:
case MHP_ApplicationIconsDescriptorTag:
case MHP_PrefetchDescriptorTag:
case MHP_DelegatedApplicationDescriptorTag:
case MHP_ApplicationStorageDescriptorTag:
default:
if (!returnUnimplemetedDescriptor)
return 0;
d=new UnimplementedDescriptor();
break;
}
break;
case PCIT:
switch ((DescriptorTag)da.getData<DescriptorHeader>()->descriptor_tag) {
case ContentDescriptorTag:
d=new ContentDescriptor();
break;
case ShortEventDescriptorTag:
d=new ShortEventDescriptor();
break;
case ExtendedEventDescriptorTag:
d=new ExtendedEventDescriptor();
break;
case PremiereContentTransmissionDescriptorTag:
d=new PremiereContentTransmissionDescriptor();
break;
default:
if (!returnUnimplemetedDescriptor)
return 0;
d=new UnimplementedDescriptor();
break;
}
break;
}
d->setData(da);
return d;
}
} //end of namespace
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