//---------------------------------------------------------------------------
bool File_Ico::FileHeader_Begin()
{
//Element_Size
if (Buffer_Size<4)
return false; //Must wait for more data
if (CC2(Buffer) || (LittleEndian2int16u(Buffer+2)!=1 && LittleEndian2int16u(Buffer+2)!=2))
{
Reject("ICO");
return false;
}
//All should be OK...
return true;
}
//---------------------------------------------------------------------------
// Little Endian - float 80 bits
float80 LittleEndian2float80(const char* Liste)
{
//sign 1 bit
//exponent 15 bit
//integer? 1 bit
//significand 63 bit
//Retrieving data
int16u Integer1=LittleEndian2int16u(Liste);
int64u Integer2=LittleEndian2int64u(Liste+2);
//Retrieving elements
bool Sign =(Integer1&0x8000)?true:false;
int16u Exponent= Integer1&0x7FFF;
int64u Mantissa= Integer2&0x7FFFFFFFFFFFFFFFLL; //Only 63 bits, 1 most significant bit is explicit
//Some computing
if (Exponent==0 || Exponent==0x7FFF)
return 0; //These are denormalised numbers, NANs, and other horrible things
Exponent-=0x3FFF; //Bias
float80 Answer=(((float80)Mantissa)/9223372036854775808.0+1.0)*std::pow((float)2, (int)Exponent); //(1+Mantissa) * 2^Exponent
if (Sign)
Answer=-Answer;
return (float80)Answer;
}
bool File_Zip::end_of_central_directory()
{
if (Element_Offset+22>Element_Size) //end_of_central_directory up to relative offset of .ZIP file comment length included
return false; //Not enough data
//Retrieving complete local_file_header size
int16u zip_comment_length=LittleEndian2int16u(Buffer+(size_t)Element_Offset+20);
if (Element_Offset+22+zip_comment_length>Element_Size) //end_of_central_directory all included
return false; //Not enough data
//Parsing
int32u offset;
Element_Begin1("End of central directory");
Skip_C4( "end of central dir signature");
Skip_L2( "number of this disk");
Skip_L2( "number of the disk");// with the start of the central directory
Skip_L2( "total number of entries on this disk");// in the central directory
Skip_L2( "total number of entries");// in the central directory
Skip_L4( "size of the central directory");
Get_L4 (offset, "offset of start of central directory");// with respect to the starting disk number
Skip_L2( "zip file comment length");
Skip_XX(zip_comment_length, "zip file comment");
Element_End0();
//Going to first central directory (once)
if (!end_of_central_directory_IsParsed)
{
end_of_central_directory_IsParsed=true;
GoTo(offset);
}
return true;
}
//---------------------------------------------------------------------------
bool File_Rar::Header_Begin()
{
if (Element_Offset+7>Element_Size)
return false; //Not enough data for header size
int16u HEAD_SIZE=LittleEndian2int16u(Buffer+Buffer_Offset+(size_t)Element_Offset+5);
if (Element_Offset+HEAD_SIZE>Element_Size)
return false; //Not enough data for header
return true;
}
//---------------------------------------------------------------------------
bool File_Umf::FileHeader_Begin()
{
//Element_Size
if (Buffer_Size<2)
return false; //Must wait for more data
int16u Length=LittleEndian2int16u(Buffer);
if (Buffer_Size<Length)
return false; //Must wait for more data
//All should be OK...
Accept("UMF");
return true;
}
//---------------------------------------------------------------------------
bool File_Dts::Synchronize()
{
//Synchronizing
while (Buffer_Offset+6<=Buffer_Size
&& !(BigEndian2int16u (Buffer+Buffer_Offset+0)==0x7FFE && BigEndian2int16u (Buffer+Buffer_Offset+2)==0x8001) //16 bits and big endian bitstream
&& !(LittleEndian2int16u(Buffer+Buffer_Offset+0)==0x7FFE && LittleEndian2int16u(Buffer+Buffer_Offset+2)==0x8001) //16 bits and little endian bitstream
&& !(BigEndian2int16u (Buffer+Buffer_Offset+0)==0x1FFF && BigEndian2int16u (Buffer+Buffer_Offset+2)==0xE800 && (BigEndian2int16u (Buffer+Buffer_Offset+4)&0xFFF0)==0x07F0) //14 bits and big endian bitstream
&& !(LittleEndian2int16u(Buffer+Buffer_Offset+0)==0x1FFF && LittleEndian2int16u(Buffer+Buffer_Offset+2)==0xE800 && (LittleEndian2int16u(Buffer+Buffer_Offset+4)&0xFFF0)==0x07F0) //14 bits and little endian bitstream
)
Buffer_Offset++;
if (Buffer_Offset+6>Buffer_Size)
{
//Parsing last bytes
if (Buffer_Offset+6==Buffer_Size)
{
if (CC4(Buffer+Buffer_Offset)!=0x7FFE8001) //For 6 bytes instead of 4 (14 bits)
{
Buffer_Offset++;
if (CC4(Buffer+Buffer_Offset)!=0x7FFE8001) //For 6 bytes instead of 4 (14 bits)
{
Buffer_Offset++;
if (CC4(Buffer+Buffer_Offset)!=0x7FFE8001)
{
Buffer_Offset++;
if (CC3(Buffer+Buffer_Offset)!=0x7FFE80)
{
Buffer_Offset++;
if (CC2(Buffer+Buffer_Offset)!=0x7FFE)
{
Buffer_Offset++;
if (CC1(Buffer+Buffer_Offset)!=0x7F)
Buffer_Offset++;
}
}
}
}
}
}
//Delay
if (Frame_Count==0)
Delay+=Buffer_Offset;
return false;
}
//Configuring and Delay
if (Frame_Count==0)
{
if (0) ;
else if (BigEndian2int16u (Buffer+Buffer_Offset)==0x7FFE) //16 bits and big endian bitstream
{
}
else if (LittleEndian2int16u(Buffer+Buffer_Offset)==0x7FFE) //16 bits and little endian bitstream
{
BigEndian=false;
}
else if (BigEndian2int16u (Buffer+Buffer_Offset)==0x1FFF) //14 bits and big endian bitstream
{
Word=false;
}
else if (LittleEndian2int16u(Buffer+Buffer_Offset)==0x1FFF) //14 bits and little endian bitstream
{
Word=false;
BigEndian=false;
}
SyncCode=CC4(Buffer+Buffer_Offset);
//14-bits and Little endian are not yet supported
if (!Word || !BigEndian)
{
Finnished();
return false;
}
//Delay
Delay+=Buffer_Offset;
}
//Synched is OK
Synched=true;
return true;
}
bool File_Zip::central_directory()
{
if (Element_Offset+46>Element_Size) //central_directory up to relative offset of local header included
return false; //Not enough data
//Retrieving complete local_file_header size
int16u file_name_length=LittleEndian2int16u(Buffer+(size_t)Element_Offset+28);
int16u extra_field_length=LittleEndian2int16u(Buffer+(size_t)Element_Offset+30);
int16u file_comment_length=LittleEndian2int16u(Buffer+(size_t)Element_Offset+32);
if (Element_Offset+46+file_name_length+extra_field_length+file_comment_length>Element_Size) //central_directory_structure all included
return false; //Not enough data
int16u general_purpose_bit_flag;
bool efs;
int16u version_made_by,compression_method;
//Parsing
Element_Begin1("Central directory");
Skip_C4("central file header signature");
Get_L2 (version_made_by,"version made by");Param_Info1((version_made_by>>8)>20?"unused":Zip_made_by[version_made_by>>8]);
Skip_L2("version needed to extract");
Get_L2 (general_purpose_bit_flag,"general purpose bit flag");
Skip_Flags(general_purpose_bit_flag, 0, "encrypted file");
Skip_Flags(general_purpose_bit_flag, 1, "8K sliding dictionary");
Skip_Flags(general_purpose_bit_flag, 2, "3 Shannon-Fano trees");
Skip_Flags(general_purpose_bit_flag, 3, "data descriptor");
Skip_Flags(general_purpose_bit_flag, 4, "Reserved for use with method 8");
Skip_Flags(general_purpose_bit_flag, 4, "file is compressed patched data");
Skip_Flags(general_purpose_bit_flag, 4, "Strong encryption");
//~ Skip_Flags(general_purpose_bit_flag, 4, "Currently unused");
//~ Skip_Flags(general_purpose_bit_flag, 4, "Currently unused");
//~ Skip_Flags(general_purpose_bit_flag, 4, "Currently unused");
//~ Skip_Flags(general_purpose_bit_flag, 4, "Currently unused");
Get_Flags (general_purpose_bit_flag, 11, efs, "Language encoding flag (EFS)");
//~ Skip_Flags(general_purpose_bit_flag, 4, "Reserved by PKWARE for enhanced compression");
//~ Skip_Flags(general_purpose_bit_flag, 4, "");
//~ Skip_Flags(general_purpose_bit_flag, 4, "Reserved by PKWARE");
//~ Skip_Flags(general_purpose_bit_flag, 4, "Reserved by PKWARE");
Get_L2 (compression_method,"compression method");
Param_Info1C((compression_method<20), Zip_compression_method[compression_method]);
Param_Info1C((compression_method==97||compression_method==98), Zip_compression_method[compression_method-97+20]);
Skip_L2("last mod file time");
Skip_L2("last mod file date");
Skip_L4("crc-32");
Skip_L4("compressed size");
Skip_L4("uncompressed size");
Skip_L2("file name length");
Skip_L2("extra field length");
Skip_L2("file comment length");
Skip_L2("disk number start");
Skip_L2("internal file attributes");
Skip_L4("external file attributes");
Skip_L4("relative offset of local header");
if(efs) {
Skip_UTF8(file_name_length,"file name");
Skip_UTF8(extra_field_length,"extra field");
Skip_UTF8(file_comment_length,"file comment");
} else {
Skip_Local(file_name_length,"file name");
Skip_Local(extra_field_length,"extra field");
Skip_Local(file_comment_length,"file comment");
}
Element_End0();
return true;
}
//---------------------------------------------------------------------------
void File_Tiff::GetValueOffsetu(ifditem &IfdItem)
{
ZtringList &Info=Infos[IfdItem.Tag]; Info.clear(); Info.Separator_Set(0, __T(" / "));
const char* Name=Tiff_Tag_Name(IfdItem.Tag);
if (IfdItem.Count>=10)
{
//Too many data, we don't currently need it and we skip it
Skip_XX(Element_Size-(Element_Offset+4), Name);
Info.clear();
return;
}
switch (IfdItem.Type)
{
case 1: /* 8-bit unsigned integer. */
for (int16u Pos=0; Pos<IfdItem.Count; Pos++)
{
int8u Ret8;
#if MEDIAINFO_TRACE
if (LittleEndian)
Get_L1 (Ret8, Name);
else
Get_B1 (Ret8, Name);
Element_Info1(Ztring::ToZtring(Ret8));
#else //MEDIAINFO_TRACE
if (Element_Offset+1>Element_Size)
{
Trusted_IsNot();
break;
}
if (LittleEndian)
Ret8=LittleEndian2int8u(Buffer+Buffer_Offset+(size_t)Element_Offset);
else
Ret8=BigEndian2int8u(Buffer+Buffer_Offset+(size_t)Element_Offset);
Element_Offset++;
#endif //MEDIAINFO_TRACE
Info.push_back(Ztring::ToZtring(Ret8));
}
break;
case 3: /* 16-bit (2-byte) unsigned integer. */
for (int16u Pos=0; Pos<IfdItem.Count; Pos++)
{
int16u Ret16;
#if MEDIAINFO_TRACE
if (LittleEndian)
Get_L2 (Ret16, Name);
else
Get_B2 (Ret16, Name);
switch (IfdItem.Tag)
{
case Tiff_Tag::Compression : Element_Info1(Tiff_Compression(Ret16)); break;
case Tiff_Tag::PhotometricInterpretation : Element_Info1(Tiff_PhotometricInterpretation(Ret16)); break;
default : Element_Info1(Ztring::ToZtring(Ret16));
}
#else //MEDIAINFO_TRACE
if (Element_Offset+2>Element_Size)
{
Trusted_IsNot();
break;
}
if (LittleEndian)
Ret16=LittleEndian2int16u(Buffer+Buffer_Offset+(size_t)Element_Offset);
else
Ret16=BigEndian2int16u(Buffer+Buffer_Offset+(size_t)Element_Offset);
Element_Offset+=2;
#endif //MEDIAINFO_TRACE
Info.push_back(Ztring::ToZtring(Ret16));
}
break;
case 4: /* 32-bit (4-byte) unsigned integer */
for (int16u Pos=0; Pos<IfdItem.Count; Pos++)
{
int32u Ret32;
#if MEDIAINFO_TRACE
if (LittleEndian)
Get_L4 (Ret32, Name);
else
Get_B4 (Ret32, Name);
Element_Info1(Ztring::ToZtring(Ret32));
#else //MEDIAINFO_TRACE
if (Element_Offset+4>Element_Size)
{
Trusted_IsNot();
break;
}
if (LittleEndian)
Ret32=LittleEndian2int32u(Buffer+Buffer_Offset+(size_t)Element_Offset);
else
Ret32=BigEndian2int32u(Buffer+Buffer_Offset+(size_t)Element_Offset);
Element_Offset+=4;
#endif //MEDIAINFO_TRACE
Info.push_back(Ztring::ToZtring(Ret32));
}
break;
default: //Unknown
{
if (LittleEndian)
Skip_L4( Name);
else
Skip_B4( Name);
Info.clear(); //We actually do not know the type
}
}
}
