msg_header.~cpp

HRIT读取,用于在LINUX下显示高束数据图像

//-----------------------------------------------------------------------------
//
//  File        : MSG_header.cpp
//  Description : MSG HRIT-LRIT format interface
//  Project     : Meteosatlib
//  Author      : Graziano Giuliani
//  References  : MSG/SPE/057 LRIT-HRIT Mission Specific Implementation,
//                V. 4.1 9 Mar 2001
//
//  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.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
//-----------------------------------------------------------------------------

#include <cstring>

#include <MSG_header.h>

extern void AddHritLog(char * Type, char *Str,bool aP);
stTextInfo::stTextInfo()
{
	Header_Type = 0;
    Header_Record_Length = 0;
    szText = NULL;
    bValid = false;
}
stTextInfo::~stTextInfo()
{
	if(szText!=NULL)delete szText;
}
bool stTextInfo::Assign(unsigned char *ptr)
{
	if(szText!=NULL)
    {
        delete szText;
        szText = NULL;
    }
    if(*ptr==Header_Type)
    {
    	Header_Record_Length = UInt2(ptr+1);
        szText = new char[Header_Record_Length];
        if(szText!=NULL)
        {
            ZeroMemory(szText, Header_Record_Length);
            MoveMemory(szText, ptr+3, Header_Record_Length-3);
            bValid = true;
            return true;
        }
    }
	return false;
}
//===========================================================================
bool stPrimaryHeader::Assign(unsigned char *ptr)
{
	Header_Type = 0;
	if(*ptr==Header_Type)
    {
    	Header_Record_Length = 0x10;
		File_Type_Code = ptr[3];
		Total_Header_Length = UInt4(ptr+4);
		Data_Field_Length = UInt8(ptr+8);
        Data_Field_Length /=8 ;
        bValid = true;
		return true;
    }
    return false;
}
//---------------------------------------------------------------------------
bool stImageStruct::Assign(unsigned char *ptr)
{
	Header_Type = 1;
	if(*ptr==Header_Type)
    {
    	Header_Record_Length = 9;
        NB = ptr[3];
        NC = UInt2(ptr+4);
        NL = UInt2(ptr+6);
        Compression_Flag = ptr[8];
        bValid = true;
		return true;
    }
    return false;
}
//---------------------------------------------------------------------------
bool stImageNavigation::Assign(unsigned char *ptr)
{
	Header_Type = 2;
	if(*ptr==Header_Type)
    {
        Header_Record_Length = 0x33;
        ZeroMemory(Projection_Name, 32);
        MoveMemory(Projection_Name, ptr+3, 30);
        CFAC = UInt4(ptr+35);
        LFAC = UInt4(ptr+39);
        COFF = UInt4(ptr+43);
        LOFF = UInt4(ptr+47);
        bValid = true;
		return true;
    }
    return false;
}
//---------------------------------------------------------------------------
bool stTimeStamp::Assign(unsigned char *ptr)
{
	Header_Type = 5;
	if(*ptr==Header_Type)
    {
    	Header_Record_Length = 10;
        CDS_P_Field = ptr[3];
        CDS_T_Field_day = UInt2(ptr+4);
        CDS_T_Field_ms = UInt4(ptr+6);
        bValid = true;
		return true;
    }
    return false;
}
//---------------------------------------------------------------------------
bool stKeyHeader::Assign(unsigned char *ptr)
{
	Header_Type = 7;
	if(*ptr==Header_Type)
    {
    	Header_Record_Length = 7;
		Key_Number = UInt4(ptr+3);
        bValid = true;
		return true;
    }
    return false;
}
//---------------------------------------------------------------------------
bool stImageSegmentID::Assign(unsigned char *ptr)
{
	Header_Type = 0x80;
	if(*ptr==Header_Type)
    {
    	Header_Record_Length = 7;
        Image_Segm_Seq_No = ptr[3];
        Total_No_Image_Segm = ptr[4];
        Line_No_Image_Segm = UInt2(ptr+5);
        bValid = true;
		return true;
    }
    return false;
}
//---------------------------------------------------------------------------
bool stEncryptionKeyMsgHeader::Assign(unsigned char *ptr)
{
  Header_Type = 0x81;
  if(*ptr==Header_Type)
    {
    	Header_Record_Length = 5;
		Station_Number = UInt2(ptr+3);
        bValid = true;
		return true;
    }
    return false;
}


//===========================================================================
THritFile::THritFile()
{
    data = NULL;
    dwBufSize = 0;
}
//---------------------------------------------------------------------------
THritFile::THritFile(char* fs)
{
    data = NULL;
    dwBufSize = 0;
    strncpy(szFileName, fs, 254);
    GetHeaderInfo();
}
//---------------------------------------------------------------------------
THritFile::~THritFile()
{
    if(data!=NULL) delete data;
}
//---------------------------------------------------------------------------
void THritFile::SetFileName(unsigned char *fs)
{
    strncpy(szFileName, fs, 254);
}
//---------------------------------------------------------------------------
void THritFile::GetHeaderInfo(unsigned char *ptr, int n)
{
	int i = 0;

    if(m_PrimaryHeader.Assign(ptr+i))
    {
        i += m_PrimaryHeader.Header_Record_Length;
    }
    if(m_ImageStruct.Assign(ptr+i))
    {
        i += m_ImageStruct.Header_Record_Length;
    }
    if(i<n && m_ImageNavigation.Assign(ptr+i))
    {
        i += m_ImageNavigation.Header_Record_Length;
    }
    if(i<n && m_ImageDataFunction.Assign(ptr+i))
    {
        i += m_ImageDataFunction.Header_Record_Length;
    }
    if(i<n && m_Annotation.Assign(ptr+i))
    {
        i += m_Annotation.Header_Record_Length;
    }
    if(i<n && m_TimeStamp.Assign(ptr+i))
    {
        i += m_TimeStamp.Header_Record_Length;
    }
    if(i<n && m_AncillaryText.Assign(ptr+i))
    {
        i += m_AncillaryText.Header_Record_Length;
    }
    if(i<n && m_KeyHeader.Assign(ptr+i))
    {
        i += m_KeyHeader.Header_Record_Length;
    }
    if(i<n && m_ImageSegmentID.Assign(ptr+i))
    {
        i += m_ImageSegmentID.Header_Record_Length;
    }
    if(i<n && m_EncryptionKeyMsgHeader.Assign(ptr+i))
    {
        i += m_EncryptionKeyMsgHeader.Header_Record_Length;
    }
    if(i<n && m_ImageCompensationInfo.Assign(ptr+i))
    {
        i += m_ImageCompensationInfo.Header_Record_Length;
    }
    if(i<n && m_ImageObserveTime.Assign(ptr+i))
    {
        i += m_ImageObserveTime.Header_Record_Length;
    }
    if(i<n) m_ImageQualityInfo.Assign(ptr+i);
}


//---------------------------------------------------------------------------
void THritFile::GetHeaderInfo()
{
    unsigned int  i, k, n;
    unsigned char *ptr;
    unsigned char A[32];
    FILE *fp = fopen(szFileName, "rb");
    if(fp!=NULL)
    {
        n = fread(A, 1, 16, fp);
        if(n==16)
        {
            if(m_PrimaryHeader.Assign(A))
            {
            	ptr = new char[m_PrimaryHeader.Total_Header_Length+256];
                if(ptr!=NULL)
                {
                    fseek(fp, 0, SEEK_SET);
                    n = fread(ptr, 1, m_PrimaryHeader.Total_Header_Length, fp);
                    GetHeaderInfo(ptr, n);
                    delete ptr;
                }
            }
        }
        fclose(fp);
    }
}
//---------------------------------------------------------------------------
unsigned char *THritFile::ReadDataField(unsigned long& nReadBytes)