1: function bag = PetscBagRead(fd)
  2: %
  3: %  Reads in PETSc binary file bag object
  4: %  emits as Matlab struct.  Called from
  5: %  PetscBinaryRead.m.
  6: %

  8: [name_len help_len] = ParsePetscBagDotH;

 10: bagsize = read(fd,1,'int32');  %  no longer used after petsc-3.2 just here for backward compatibility of the binary files
 11: count = read(fd,1,'int32');

 13: bag.bag_name      = deblank(char(read(fd,name_len,'uchar')'));
 14: bag.help.bag_help = deblank(char(read(fd,help_len,'uchar')'));

 16: for lcv = 1:count
 17:   offsetdtype = read(fd,2,'int32');
 18:   dtype = offsetdtype(2);
 19:   name  = strclean(deblank(char(read(fd,name_len,'uchar')')));
 20:   help  = deblank(char(read(fd,help_len,'uchar')'));
 21:   msize = read(fd,1,'int32');

 23:   if dtype == 0     % integer
 24:     val = read(fd,msize,'int32');
 25:   elseif dtype == 1 % double
 26:     val = read(fd,msize,'double');
 27:   elseif dtype == 6 % char
 28:     val = deblank(char(read(fd,msize,'uchar')'));
 29:   elseif dtype == 9 % truth
 30:     val = read(fd,1,'int32');
 31: % PETSC_LOGICAL is a bit boolean and not currently handled
 32: %  elseif dtype == 7 % boolean
 33: %    val = read(fd,1,'bit1');
 34:   elseif dtype == 8 % Enum
 35:     val   = read(fd,1,'int32');
 36:     n     = read(fd,1,'int32');
 37:     sizes = read(fd,n,'int32');
 38:     enumnames = {'  '};
 39:     for i=1:n-2,
 40:       enumnames{i} = deblank(char(read(fd,sizes(i),'uchar')));
 41:     end
 42:     val  = char(enumnames{val+1})';
 43:     enumname   = deblank(char(read(fd,sizes(n-1),'uchar')));
 44:     enumprefix = deblank(char(read(fd,sizes(n),'uchar')));
 45:   else
 46:     val = [];
 47:     warning('Bag entry %s could not be read',name);
 48:   end
 49:   bag      = setfield(bag     ,name,val);
 50:   bag.help = setfield(bag.help,name,help);
 51: end
 52: return

 54: % ---------------------------------------------------- %
 55: 
 56: function [n, h] = ParsePetscBagDotH
 57: 
 58:    petscbagh = [GetPetscDir,'/include/petsc/private/bagimpl.h'];
 59:    fid = fopen(petscbagh,'rt');
 60:    if (fid<0)
 61:       errstr = sprintf('Could not open %s.',petscbagh);
 62:       error(errstr);
 63:    end
 64: 
 65:    nametag = '#define PETSC_BAG_NAME_LENGTH';
 66:    helptag = '#define PETSC_BAG_HELP_LENGTH';
 67:    n = 0; h = 0;
 68:    while ~feof(fid)
 69:       lin = fgetl(fid);
 70:       ni = strfind(lin,nametag);
 71:       nh = strfind(lin,helptag);
 72:       if ni
 73:          n = str2num(lin(ni+length(nametag):end));
 74:       elseif nh
 75:          h = str2num(lin(nh+length(helptag):end));
 76:       end
 77:       if (n>0 & h>0) break; end;
 78:    end
 79:    if (n==0 | h==0)
 80:       errstr = sprintf('Could not parse %s.',petscbagh);
 81:       error(errstr);
 82:    end
 83:    fclose(fid);
 84:    return
 85: 
 86: % ---------------------------------------------------- %
 87: 
 88: function str = strclean(str)
 89: 
 90:    badchars = ' ()[]<>{}.-';
 91:    for i=1:length(badchars);
 92:       str(strfind(str,badchars(i))) = '_';
 93:    end
 94:    return
 95: 
 96: % ---------------------------------------------------- %
 97: 
 98: function dir = GetPetscDir
 99: 
100:    dir = getenv('PETSC_DIR');
101:    if length(dir)==0
102:       error(['Please set environment variable PETSC_DIR' ...
103:              ' and try again.'])
104:    end
105:    return