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/* Copyright (c) MediaArea.net SARL. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license that can
* be found in the License.html file in the root of the source tree.
*/
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//
// Information about PNG files
//
// From http://www.fileformat.info/format/png/
//
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//---------------------------------------------------------------------------
// Pre-compilation
#include "MediaInfo/PreComp.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
#include "MediaInfo/Setup.h"
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
#if defined(MEDIAINFO_PNG_YES)
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
#include "MediaInfo/Image/File_Png.h"
#include "MediaInfo/MediaInfo_Config_MediaInfo.h"
//---------------------------------------------------------------------------
namespace MediaInfoLib
{
//***************************************************************************
// Infos
//***************************************************************************
//---------------------------------------------------------------------------
const char* Png_Colour_type(int8u Colour_type)
{
switch (Colour_type)
{
case 0 : return "Greyscale";
case 2 : return "Truecolour";
case 3 : return "Indexed-colour";
case 4 : return "Greyscale with alpha";
case 6 : return "Truecolour with alpha";
default: return "";
}
}
//***************************************************************************
// Constants
//***************************************************************************
//---------------------------------------------------------------------------
namespace Elements
{
const int32u IDAT=0x49444154;
const int32u IEND=0x49454E44;
const int32u IHDR=0x49484452;
const int32u PLTE=0x506C5445;
}
//***************************************************************************
// Constructor/Destructor
//***************************************************************************
//---------------------------------------------------------------------------
File_Png::File_Png()
{
//Config
#if MEDIAINFO_TRACE
Trace_Layers_Update(8); //Stream
#endif //MEDIAINFO_TRACE
IsRawStream=true;
//Temp
Signature_Parsed=false;
}
//***************************************************************************
// Streams management
//***************************************************************************
//---------------------------------------------------------------------------
void File_Png::Streams_Accept()
{
if (!IsSub)
{
TestContinuousFileNames();
Stream_Prepare((Config->File_Names.size()>1 || Config->File_IsReferenced_Get())?Stream_Video:Stream_Image);
if (File_Size!=(int64u)-1)
Fill(StreamKind_Last, StreamPos_Last, Fill_Parameter(StreamKind_Last, Generic_StreamSize), File_Size);
if (StreamKind_Last==Stream_Video)
Fill(Stream_Video, StreamPos_Last, Video_FrameCount, Config->File_Names.size());
}
else
Stream_Prepare(StreamKind_Last);
}
//***************************************************************************
// Header
//***************************************************************************
//---------------------------------------------------------------------------
bool File_Png::FileHeader_Begin()
{
//Element_Size
if (Buffer_Size<8)
return false; //Must wait for more data
if (CC4(Buffer+4)!=0x0D0A1A0A) //Byte order
{
Reject("PNG");
return false;
}
switch (CC4(Buffer)) //Signature
{
case 0x89504E47 :
Accept("PNG");
Fill(Stream_General, 0, General_Format, "PNG");
Fill(StreamKind_Last, 0, Fill_Parameter(StreamKind_Last, Generic_Format), "PNG");
Fill(StreamKind_Last, 0, Fill_Parameter(StreamKind_Last, Generic_Codec), "PNG");
break;
case 0x8A4E4E47 :
Accept("PNG");
Fill(Stream_General, 0, General_Format, "MNG");
Fill(StreamKind_Last, 0, Fill_Parameter(StreamKind_Last, Generic_Format), "MNG");
Fill(StreamKind_Last, 0, Fill_Parameter(StreamKind_Last, Generic_Codec), "MNG");
Finish("PNG");
break;
case 0x8B4A4E47 :
Accept("PNG");
Fill(Stream_General, 0, General_Format, "JNG");
Fill(StreamKind_Last, 0, Fill_Parameter(StreamKind_Last, Generic_Format), "JNG");
Fill(StreamKind_Last, 0, Fill_Parameter(StreamKind_Last, Generic_Codec), "JNG");
Finish("PNG");
break;
default:
Reject("PNG");
}
//All should be OK...
return true;
}
//***************************************************************************
// Buffer - Global
//***************************************************************************
//---------------------------------------------------------------------------
void File_Png::Read_Buffer_Unsynched()
{
Signature_Parsed=false;
Read_Buffer_Unsynched_OneFramePerFile();
}
//***************************************************************************
// Buffer - Per element
//***************************************************************************
//---------------------------------------------------------------------------
void File_Png::Header_Parse()
{
if (!Signature_Parsed)
{
//Filling
Header_Fill_Size(8);
Header_Fill_Code(0, "File header");
return;
}
//Parsing
int32u Length, Chunk_Type;
Get_B4 (Length, "Length");
Get_C4 (Chunk_Type, "Chunk Type");
//Filling
Header_Fill_Size(12+Length); //+4 for CRC
Header_Fill_Code(Chunk_Type, Ztring().From_CC4(Chunk_Type));
}
//---------------------------------------------------------------------------
void File_Png::Data_Parse()
{
if (!Signature_Parsed)
{
Signature();
return;
}
Element_Size-=4; //For CRC
#define CASE_INFO(_NAME, _DETAIL) \
case Elements::_NAME : Element_Info1(_DETAIL); _NAME(); break;
//Parsing
switch (Element_Code)
{
CASE_INFO(IDAT, "Image data");
CASE_INFO(IEND, "Image trailer");
CASE_INFO(IHDR, "Image header");
CASE_INFO(PLTE, "Palette table");
default : Skip_XX(Element_Size, "Unknown");
}
Element_Size+=4; //For CRC
Skip_B4( "CRC");
}
//***************************************************************************
// Elements
//***************************************************************************
//---------------------------------------------------------------------------
void File_Png::Signature()
{
//Parsing
Skip_B4( "Signature");
Skip_B4( "ByteOrder");
Frame_Count++;
if (Frame_Count_NotParsedIncluded!=(int64u)-1)
Frame_Count_NotParsedIncluded++;
Signature_Parsed=true;
}
//---------------------------------------------------------------------------
void File_Png::IEND()
{
Signature_Parsed=false;
}
//---------------------------------------------------------------------------
void File_Png::IHDR()
{
//Parsing
int32u Width, Height;
int8u Bit_depth, Colour_type, Compression_method, Interlace_method;
Get_B4 (Width, "Width");
Get_B4 (Height, "Height");
Get_B1 (Bit_depth, "Bit depth");
Get_B1 (Colour_type, "Colour type"); Param_Info1(Png_Colour_type(Colour_type));
Get_B1 (Compression_method, "Compression method");
Skip_B1( "Filter method");
Get_B1 (Interlace_method, "Interlace method");
FILLING_BEGIN_PRECISE();
if (!Status[IsFilled])
{
Fill(StreamKind_Last, 0, "Width", Width);
Fill(StreamKind_Last, 0, "Height", Height);
int8u Resolution;
switch (Colour_type)
{
case 0 : Resolution=Bit_depth; break;
case 2 : Resolution=Bit_depth*3; break;
case 3 : Resolution=Bit_depth; break;
case 4 : Resolution=Bit_depth*2; break;
case 6 : Resolution=Bit_depth*4; break;
default: Resolution=0;
}
if (Resolution)
Fill(StreamKind_Last, 0, "BitDepth", Resolution);
switch (Compression_method)
{
case 0 :
Fill(StreamKind_Last, 0, "Format_Compression", "LZ77");
break;
default: ;
}
switch (Interlace_method)
{
case 0 :
break;
case 1 :
break;
default: ;
}
Fill();
}
if (Config->ParseSpeed<1.0)
Finish("PNG"); //No need of more
FILLING_END();
}
} //NameSpace
#endif
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