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Fixed handling improperly formatted EIT data

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This commit is contained in:
Klaus Schmidinger
2002-01-30 18:31:34 +01:00
parent 7803f04b8e
commit a2c2926079
4 changed files with 45 additions and 25 deletions
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28
libdtv/libsi/si_parser.c
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@@ -4,8 +4,8 @@
/// ///
//////////////////////////////////////////////////////////////
// $Revision: 1.4 $
// $Date: 2001/10/07 10:24:46 $
// $Revision: 1.6 $
// $Date: 2002/01/30 17:04:13 $
// $Author: hakenes $
//
// (C) 2001 Rolf Hakenes <hakenes@hippomi.de>, under the GNU GPL.
@@ -119,7 +119,8 @@ struct Pid *siParsePMT (u_char *Buffer)
CreatePid (Pid, ProgramID, PcrID, PmtVersion);
siParseDescriptors (Pid->Descriptors, Ptr, ProgramInfoLength, Pmt->table_id);
if (StreamLength >= 0) siParseDescriptors (Pid->Descriptors, Ptr,
ProgramInfoLength, Pmt->table_id);
Ptr += ProgramInfoLength;
@@ -209,6 +210,8 @@ struct LIST *siParseSDT (u_char *Buffer)
SetPresentFollowing (Service->Status);
LoopLength = HILO (SdtDescriptor->descriptors_loop_length);
if (LoopLength > SectionLength - SDT_DESCR_LEN)
return (ServiceList);
Ptr += SDT_DESCR_LEN;
siParseDescriptors (Service->Descriptors, Ptr, LoopLength, Sdt->table_id);
@@ -297,6 +300,8 @@ struct LIST *siParseEIT (u_char *Buffer)
Event->Duration = BcdTimeToSeconds (EitEvent->duration);
LoopLength = HILO (EitEvent->descriptors_loop_length);
if (LoopLength > SectionLength - EIT_EVENT_LEN)
return (EventList);
Ptr += EIT_EVENT_LEN;
siParseDescriptors (Event->Descriptors, Ptr, LoopLength, Eit->table_id);
@@ -349,6 +354,8 @@ void siParseDescriptors (struct LIST *Descriptors, u_char *Buffer,
while (DescriptorLength < Length)
{
if ((GetDescriptorLength (Ptr) > Length - DescriptorLength) ||
(GetDescriptorLength (Ptr) <= 0)) return;
switch (TableID)
{
case TID_NIT_ACT: case TID_NIT_OTH:
@@ -554,7 +561,6 @@ void siParseDescriptor (struct LIST *Descriptors, u_char *Buffer)
Text = siGetDescriptorText (Buffer + DESCR_BOUQUET_NAME_LEN,
GetDescriptorLength (Buffer) - DESCR_BOUQUET_NAME_LEN);
CreateBouquetNameDescriptor (Descriptor, Text);
// xMemFree (Text);
break;
case DESCR_COMPONENT:
@@ -567,7 +573,6 @@ void siParseDescriptor (struct LIST *Descriptors, u_char *Buffer)
CastComponentDescriptor(Buffer)->lang_code1,
CastComponentDescriptor(Buffer)->lang_code2,
CastComponentDescriptor(Buffer)->lang_code3, Text);
// xMemFree (Text);
break;
case DESCR_SERVICE:
@@ -579,7 +584,6 @@ void siParseDescriptor (struct LIST *Descriptors, u_char *Buffer)
CastServiceDescriptor(Buffer)->provider_name_length)));
CreateServiceDescriptor (Descriptor,
CastServiceDescriptor(Buffer)->service_type, Text, Text2);
// xMemFree (Text2);
break;
case DESCR_COUNTRY_AVAIL:
@@ -603,7 +607,6 @@ void siParseDescriptor (struct LIST *Descriptors, u_char *Buffer)
CastShortEventDescriptor(Buffer)->lang_code1,
CastShortEventDescriptor(Buffer)->lang_code2,
CastShortEventDescriptor(Buffer)->lang_code3, Text2);
// xMemFree (Text);
break;
case DESCR_EXTENDED_EVENT:
@@ -617,10 +620,9 @@ void siParseDescriptor (struct LIST *Descriptors, u_char *Buffer)
CastExtendedEventDescriptor(Buffer)->lang_code1,
CastExtendedEventDescriptor(Buffer)->lang_code2,
CastExtendedEventDescriptor(Buffer)->lang_code3, Text);
// xMemFree (Text);
Length = CastExtendedEventDescriptor(Buffer)->length_of_items;
Ptr += DESCR_EXTENDED_EVENT_LEN;
while (Length > 0)
while ((Length > 0) && (Length < GetDescriptorLength (Buffer)))
{
Text = siGetDescriptorText (Ptr + ITEM_EXTENDED_EVENT_LEN,
CastExtendedEventItem(Ptr)->item_description_length);
@@ -629,7 +631,6 @@ void siParseDescriptor (struct LIST *Descriptors, u_char *Buffer)
*((u_char *)(Ptr + ITEM_EXTENDED_EVENT_LEN +
CastExtendedEventItem(Ptr)->item_description_length)));
AddExtendedEventItem (Descriptor, Text2, Text);
// xMemFree (Text2);
Length -= ITEM_EXTENDED_EVENT_LEN + CastExtendedEventItem(Ptr)->item_description_length +
*((u_char *)(Ptr + ITEM_EXTENDED_EVENT_LEN +
CastExtendedEventItem(Ptr)->item_description_length)) + 1;
@@ -760,7 +761,7 @@ void siParseDescriptor (struct LIST *Descriptors, u_char *Buffer)
ASVC_FLAG, CastAc3Descriptor(Buffer)->asvc); }
Length -= DESCR_AC3_LEN;
Ptr += DESCR_AC3_LEN;
if (Length) AddAc3AdditionalData (Descriptor, Ptr, Length);
if (Length > 0) AddAc3AdditionalData (Descriptor, Ptr, Length);
break;
case DESCR_SUBTITLING:
@@ -843,6 +844,8 @@ char *siGetDescriptorText (u_char *Buffer, int Length)
char *tmp, *result;
int i;
if ((Length < 0) || (Length > 4095))
return (xSetText ("text error"));
if (*Buffer == 0x05 || (*Buffer >= 0x20 && *Buffer <= 0xff))
{
xMemAlloc (Length+1, &result);
@@ -852,9 +855,8 @@ char *siGetDescriptorText (u_char *Buffer, int Length)
if (*Buffer == 0) break;
if ((*Buffer >= ' ' && *Buffer <= '~') ||
(*Buffer == '\n') ||
(*Buffer >= 0xa0 && *Buffer <= 0xff)) *tmp++ = *Buffer;
if (*Buffer == 0x8A) *tmp++ = '\n';
if (*Buffer == 0x8A || *Buffer == '\n') *tmp++ = '\n';
if (*Buffer == 0x86 || *Buffer == 0x87) *tmp++ = ' ';
Buffer++;
}