| 1 | ;------------------------------------------------------------ |
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| 2 | ;------------------------------------------------------------ |
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| 3 | ;------------------------------------------------------------ |
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| 4 | ;+ |
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| 5 | ; @file_comments read the f77 unformated files used in Oasis (version < 2.5) |
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| 6 | ; |
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| 7 | ; @categories reading |
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| 8 | ; |
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| 9 | ; @param filename {in}{required} the filename |
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| 10 | ; @param varname {in}{required} the name of the variable to be read |
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| 11 | ; @param jpi {in}{required} |
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| 12 | ; @param jpj {in}{required} |
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| 13 | ; the size of the 2d array to be read |
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| 14 | ; |
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| 15 | ; @keyword /I2 |
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| 16 | ; @keyword /I4 |
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| 17 | ; @keyword /I8 |
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| 18 | ; @keyword /R4 |
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| 19 | ; to change the defaut format (R8) of the data to be read. |
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| 20 | ; |
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| 21 | ; @returns a 2d array |
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| 22 | ; |
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| 23 | ; @examples |
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| 24 | ; IDL> a=read_oasis('grids_orca_t106','a106.lon',320,160) |
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| 25 | ; IDL> m=read_oasis('masks_orca_t106','or1t.msk',182,149,/i4) |
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| 26 | ; |
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| 27 | ; see also IDL> scanoasis,'grids_orca_t106' |
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| 28 | ; |
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| 29 | ; @history Sebastien Masson (smasson\@lodyc.jussieu.fr) |
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| 30 | ; July 01, 2002 |
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| 31 | ;- |
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| 32 | ;------------------------------------------------------------ |
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| 33 | ;------------------------------------------------------------ |
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| 34 | ;------------------------------------------------------------ |
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| 35 | |
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| 36 | |
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| 37 | FUNCTION read_oasis, filename, varname, jpi, jpj, I2 = I2, I4 = i4, I8 = i8, R4 = r4 |
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| 38 | ; |
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| 39 | compile_opt idl2, strictarrsubs |
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| 40 | ; |
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| 41 | |
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| 42 | openr, unit, filename, /f77_unformatted, /get_lun, /swap_if_little_endian $ |
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| 43 | , error=err |
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| 44 | if err ne 0 then begin |
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| 45 | print,!err_string |
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| 46 | return, -1 |
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| 47 | endif |
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| 48 | |
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| 49 | char8 = '12345678' |
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| 50 | readu, unit, char8 |
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| 51 | ; print, char8 |
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| 52 | found = char8 EQ varname |
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| 53 | |
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| 54 | WHILE NOT EOF(unit) AND found NE 1 DO BEGIN |
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| 55 | readu, unit |
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| 56 | if EOF(unit) then begin |
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| 57 | print, varname+' not found in '+filename |
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| 58 | return, -1 |
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| 59 | endif |
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| 60 | readu, unit, char8 |
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| 61 | ; print, char8 |
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| 62 | found = char8 EQ varname |
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| 63 | ENDWHILE |
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| 64 | case 1 of |
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| 65 | keyword_set(i2):res = intarr(jpi, jpj) |
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| 66 | keyword_set(i4):res = lonarr(jpi, jpj) |
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| 67 | keyword_set(i8):res = lon64arr(jpi, jpj) |
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| 68 | keyword_set(r4):res = fltarr(jpi, jpj) |
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| 69 | ELSE:res = dblarr(jpi, jpj) |
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| 70 | endcase |
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| 71 | |
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| 72 | readu, unit, res |
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| 73 | |
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| 74 | free_lun,unit |
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| 75 | |
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| 76 | return, res |
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| 77 | end |
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