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1 /* hfile_net.c -- network backend for low-level input/output streams.
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2
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3 Copyright (C) 2013-2014 Genome Research Ltd.
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4
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5 Author: John Marshall <jm18@sanger.ac.uk>
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6
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7 Permission is hereby granted, free of charge, to any person obtaining a copy
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8 of this software and associated documentation files (the "Software"), to deal
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9 in the Software without restriction, including without limitation the rights
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10 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 copies of the Software, and to permit persons to whom the Software is
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12 furnished to do so, subject to the following conditions:
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13
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14 The above copyright notice and this permission notice shall be included in
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15 all copies or substantial portions of the Software.
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16
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17 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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20 THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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22 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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23 DEALINGS IN THE SOFTWARE. */
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24
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25 #include <stdlib.h>
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26 #include <errno.h>
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27
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28 #include "hfile_internal.h"
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29
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30 #include "htslib/knetfile.h"
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31
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32 typedef struct {
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33 hFILE base;
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34 knetFile *netfp;
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35 } hFILE_net;
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36
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37 static int net_inited = 0;
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38
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39 #ifdef _WIN32
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40 static void net_exit(void)
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41 {
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42 knet_win32_destroy();
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43 }
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44 #endif
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45
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46 static int net_init(void)
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47 {
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48 #ifdef _WIN32
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49 if (knet_win32_init() != 0) return -1;
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50
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51 // In the unlikely event atexit() fails, it's better to succeed here and
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52 // carry on and do the I/O; then eventually when the program exits, we'll
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53 // merely have failed to clean up properly, as if we had aborted.
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54 (void) atexit(net_exit);
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55 #endif
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56
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57 net_inited = 1;
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58 return 0;
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59 }
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60
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61 static ssize_t net_read(hFILE *fpv, void *buffer, size_t nbytes)
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62 {
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63 hFILE_net *fp = (hFILE_net *) fpv;
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64 return knet_read(fp->netfp, buffer, nbytes);
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65 }
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66
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67 static off_t net_seek(hFILE *fpv, off_t offset, int whence)
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68 {
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69 hFILE_net *fp = (hFILE_net *) fpv;
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70 return knet_seek(fp->netfp, offset, whence);
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71 }
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72
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73 static int net_close(hFILE *fpv)
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74 {
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75 hFILE_net *fp = (hFILE_net *) fpv;
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76 return knet_close(fp->netfp);
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77 }
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78
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79 static const struct hFILE_backend net_backend =
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80 {
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81 net_read, NULL, net_seek, NULL, net_close
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82 };
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83
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84 hFILE *hopen_net(const char *filename, const char *mode)
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85 {
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86 hFILE_net *fp;
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87
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88 // Do any networking initialisation if this is the first use.
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89 if (! net_inited) { if (net_init() < 0) return NULL; }
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90
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91 fp = (hFILE_net *) hfile_init(sizeof (hFILE_net), mode, 0);
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92 if (fp == NULL) return NULL;
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93
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94 fp->netfp = knet_open(filename, mode);
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95 if (fp->netfp == NULL) { hfile_destroy((hFILE *) fp); return NULL; }
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96
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97 fp->base.backend = &net_backend;
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98 return &fp->base;
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99 }
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