conversion ASCII vers EBCEDIC

Il n' y a pas de compatibilité entre ASCII et EBCDIC,

il faut donc utiliser une table de conversion:

voici en exemple de tables :

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// AsciiEbcdic.h
// tables de conversion ASCII->EBCDIC // EBCDIC -> ASCII
// par Djob.
 
// il peut y avoir quelques erreurs...
 
 
const unsigned char ascii_to_ebcdic [256] =
{
 0  , 1  , 2  , 3  , 55 , 45 , 46 , 47 , 22 , 5  , 10 , 11 , 12 , 13 , 14 , 15 ,
 16 , 17 , 18 , 19 , 60 , 61 , 50 , 38 , 24 , 25 , 63 , 39 , 28 , 29 , 30 , 31 ,
 64 , 79 , 127, 123, 91 , 108, 80 , 125, 77 , 93 , 92 , 78 , 107, 96 , 75 , 97 ,
 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 122, 94 , 76 , 126, 110, 111,
 124, 193, 194, 195, 196, 197, 198, 199, 200, 201, 209, 210, 211, 212, 213, 214,
 215, 216, 217, 226, 227, 228, 229, 230, 231, 232, 233, 74 , 224, 90 , 95 , 109,
 121, 129, 130, 131, 132, 133, 134, 135, 136, 137, 145, 146, 147, 148, 149, 150,
 151, 152, 153, 162, 163, 164, 165, 166, 167, 168, 169, 192, 106, 208, 161, 7  ,
 32 , 33 , 34 , 35 , 36 , 21 , 6  , 23 , 40 , 41 , 42 , 43 , 44 , 9  , 10 , 27 ,
 48 , 49 , 26 , 51 , 52 , 53 , 54 , 8  , 56 , 57 , 58 , 59 , 4  , 20 , 62 , 225,
 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 81 , 82 , 83 , 84 , 85 , 86 , 87 ,
 88 , 89 , 98 , 99 , 100, 101, 102, 103, 104, 105, 112, 113, 114, 115, 116, 117,
 118, 119, 120, 128, 138, 139, 140, 141, 142, 143, 144, 154, 155, 156, 157, 158,
 159, 160, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183,
 184, 185, 186, 187, 188, 189, 190, 191, 202, 203, 204, 205, 206, 207, 218, 219,
 220, 221, 222, 223, 234, 235, 236, 237, 238, 239, 250, 251, 252, 253, 254, 255
};
 
extern const unsigned char ebcdic_to_ascii [256] =
{
 0  , 1  , 2  , 3  , 156, 9  , 134, 127, 151, 141, 10, 11 , 12 , 13 , 14 , 15 ,
 16 , 17 , 18 , 19 , 157, 133, 8  , 135, 24 , 25 , 146, 143, 28 , 29 , 30 , 31 ,
 128, 129, 130, 131, 132, 10 , 23 , 27 , 136, 137, 138, 139, 140, 5  , 6  , 7  ,
 144, 145, 22 , 147, 148, 149, 150, 4  , 152, 153, 154, 155, 20 , 21 , 158, 26 ,
 32 , 160, 161, 162, 163, 164, 165, 166, 167, 168, 91 , 46 , 60 , 40 , 43 , 33 ,
 38 , 169, 170, 171, 172, 173, 174, 175, 176, 177, 93 , 36 , 42 , 41 , 59 , 94 ,
 45 , 47 , 178, 179, 180, 181, 182, 183, 184, 185, 124, 44 , 37 , 95 , 62 , 63 ,
 186, 187, 188, 189, 190, 191, 192, 193, 194, 96 , 58 , 35 , 64 , 39 , 61 , 34 ,
 195, 97 , 98 , 99 , 100, 101, 102, 103, 104, 105, 196, 197, 198, 199, 200, 201,
 202, 106, 107, 108, 109, 110, 111, 112, 113, 114, 203, 204, 205, 206, 207, 208,
 209, 126, 115, 116, 117, 118, 119, 120, 121, 122, 210, 211, 212, 213, 214, 215,
 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231,
 123, 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 232, 233, 234, 235, 236, 237,
 125, 74 , 75 , 76 , 77 , 78 , 79 , 80 , 81 , 82 , 238, 239, 240, 241, 242, 243,
 92 , 159, 83 , 84 , 85 , 86 , 87 , 88 , 89 , 90 , 244, 245, 246, 247, 248, 249,
 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 250, 251, 252, 253, 254, 255
 
};

et un exemple d'utilisation de ces tables (2 fonctions de conversion ASCII->EBCDIC/EBCDIC->ASCII

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//---------------------------------------------------------------------------
// convertit un ficher texte ASCII en EBCDIC
void __fastcall ConvertASCIIToEBCDIC(String ASCIISource,String EBCDICDest)
{
   if(!FileExists(ASCIISource)) return;
 
   TFileStream * FileSource = new TFileStream(ASCIISource,fmOpenRead);
   TFileStream * FileDest = new TFileStream(EBCDICDest,fmCreate	);
   int buffer_size = 255;              // arbitraire
   int taille_source = FileSource->Size;
   if(taille_source<buffer_size){
          buffer_size =  taille_source;
          char * buffer = new char[buffer_size];
          FileSource->Read(buffer,buffer_size);
          for(int i=0;i<buffer_size;i++){
             buffer[i]= ascii_to_ebcdic[buffer[i]];
          }
          FileDest->Write(buffer,taille_source);
   }else{
       int nb_be = taille_source / buffer_size; //nombre de boucle contenant de 255
       int nbc_restants =  taille_source % buffer_size; //nombre de caractères restants à la fin
       for(int i=0;i<nb_be;i++){
          char * buffer = new char[buffer_size];
          FileSource->Read(buffer,buffer_size);
          for(int i=0;i<buffer_size;i++){
                buffer[i]= ascii_to_ebcdic[buffer[i]];
          }
          FileDest->Write(buffer,buffer_size);
          delete buffer;
       }
       if(nbc_restants!=0){
          char * buffer = new char[nbc_restants];
          FileSource->Read(buffer,nbc_restants);
          for(int i=0;i<nbc_restants;i++){
             buffer[i]= ascii_to_ebcdic[buffer[i]];
          }
          FileDest->Write(buffer,nbc_restants);
          delete buffer;
       }
   }
   delete  FileSource;
   delete  FileDest;
}
//------------------------------------------------------------------------
// convertit un ficher texte  EBCDIC en ASCII 
 
void __fastcall ConvertEBCDICtoASCII(String EBCDISource,String ASCIIDest)
{
   if(!FileExists(EBCDISource)) return;
 
   TFileStream * FileSource = new TFileStream(EBCDISource,fmOpenRead);
   TFileStream * FileDest = new TFileStream(ASCIIDest,fmCreate	);
   int buffer_size = 255;
   int taille_source = FileSource->Size;
   if(taille_source<buffer_size){
          buffer_size =  taille_source;
          char * buffer = new char[buffer_size];
          FileSource->Read(buffer,buffer_size);
          for(int i=0;i<buffer_size;i++){
            //unsigned pour obtenir un entier>0 pour les caractères dont la valeur>127
             unsigned char c = buffer[i];
             unsigned char c2 = ebcdic_to_ascii[(int)c];
             buffer[i]= c2;
          }
          FileDest->Write(buffer,buffer_size);
          delete buffer;
   }else{
       int nb_be = taille_source / buffer_size; //nombre de boucle contenant
       int nbc_restants =  taille_source % buffer_size;
       for(int i=0;i<nb_be;i++){
          char * buffer = new char[buffer_size];
          FileSource->Read(buffer,buffer_size);
          for(int i=0;i<buffer_size;i++){
             unsigned char c = buffer[i];
             unsigned char c2 = ebcdic_to_ascii[(int)c];
             buffer[i]=c2;
          }
          FileDest->Write(buffer,buffer_size);
          delete buffer;
       }
       if(nbc_restants!=0){
          char * buffer = new char[nbc_restants];
          FileSource->Read(buffer,nbc_restants);
          for(int i=0;i<nbc_restants;i++){
             unsigned char c = buffer[i];
             unsigned char c2 =ebcdic_to_ascii[(int)c];
             buffer[i]= c2;
          }
          FileDest->Write(buffer,nbc_restants);
          delete buffer;
       }
   }
   delete  FileSource;
   delete  FileDest;
}
//------------------------------------------------------------------------

voilà , si ça peut t'aider....