[1022] | 1 | /********************************************************************* |
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| 2 | Copyright 2010, UCAR/Unidata See netcdf/COPYRIGHT file for |
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| 3 | copying and redistribution conditions. |
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| 4 | *********************************************************************/ |
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| 5 | |
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| 6 | #include <config.h> |
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| 7 | #include <stdlib.h> |
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| 8 | #include <string.h> |
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| 9 | #include <assert.h> |
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| 10 | #include "nc.h" |
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| 11 | |
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| 12 | #define ID_SHIFT (16) |
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| 13 | #define NCFILELISTLENGTH 0x10000 |
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| 14 | /* Version one just allocates the max space (sizeof(NC*)*2^16)*/ |
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| 15 | static NC** nc_filelist = NULL; |
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| 16 | |
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| 17 | static int numfiles = 0; |
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| 18 | |
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| 19 | /* Common */ |
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| 20 | int |
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| 21 | count_NCList(void) |
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| 22 | { |
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| 23 | return numfiles; |
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| 24 | } |
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| 25 | |
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| 26 | |
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| 27 | void |
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| 28 | free_NCList(void) |
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| 29 | { |
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| 30 | if(numfiles > 0) return; /* not empty */ |
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| 31 | if(nc_filelist != NULL) free(nc_filelist); |
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| 32 | nc_filelist = NULL; |
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| 33 | } |
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| 34 | |
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| 35 | int |
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| 36 | add_to_NCList(NC* ncp) |
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| 37 | { |
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| 38 | int i; |
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| 39 | int new_id; |
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| 40 | if(nc_filelist == NULL) { |
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| 41 | if (!(nc_filelist = calloc(1, sizeof(NC*)*NCFILELISTLENGTH))) |
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| 42 | return NC_ENOMEM; |
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| 43 | numfiles = 0; |
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| 44 | } |
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| 45 | new_id = 0; /* id's begin at 1 */ |
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| 46 | for(i=1;i<0x10000;i++) { |
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| 47 | if(nc_filelist[i] == NULL) {new_id = i; break;} |
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| 48 | } |
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| 49 | if(new_id == 0) return NC_ENOMEM; /* no more slots */ |
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| 50 | nc_filelist[new_id] = ncp; |
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| 51 | numfiles++; |
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| 52 | new_id = (new_id << ID_SHIFT); |
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| 53 | ncp->ext_ncid = new_id; |
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| 54 | return NC_NOERR; |
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| 55 | } |
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| 56 | |
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| 57 | void |
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| 58 | del_from_NCList(NC* ncp) |
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| 59 | { |
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| 60 | unsigned int ncid = ((unsigned int)ncp->ext_ncid) >> ID_SHIFT; |
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| 61 | if(numfiles == 0 || ncid == 0 || nc_filelist == NULL) return; |
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| 62 | if(nc_filelist[ncid] != ncp) return; |
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| 63 | nc_filelist[ncid] = NULL; |
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| 64 | numfiles--; |
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| 65 | |
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| 66 | /* If all files have been closed, release the filelist memory. */ |
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| 67 | if (numfiles == 0) |
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| 68 | free_NCList(); |
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| 69 | } |
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| 70 | |
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| 71 | NC * |
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| 72 | find_in_NCList(int ext_ncid) |
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| 73 | { |
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| 74 | NC* f = NULL; |
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| 75 | unsigned int ncid = ((unsigned int)ext_ncid) >> ID_SHIFT; |
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| 76 | if(numfiles > 0 && nc_filelist != NULL && ncid < NCFILELISTLENGTH) |
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| 77 | f = nc_filelist[ncid]; |
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| 78 | return f; |
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| 79 | } |
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| 80 | |
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