tests/test-ansi-c-plugin.c

   1 /* nbdkit
   2  * Copyright (C) 2013-2019 Red Hat Inc.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are
   6  * met:
   7  *
   8  * * Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer.
  10  *
  11  * * Redistributions in binary form must reproduce the above copyright
  12  * notice, this list of conditions and the following disclaimer in the
  13  * documentation and/or other materials provided with the distribution.
  14  *
  15  * * Neither the name of Red Hat nor the names of its contributors may be
  16  * used to endorse or promote products derived from this software without
  17  * specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  21  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  22  * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
  23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  26  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  27  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  28  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  29  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <string.h>
  36
  37 #include <nbdkit-plugin.h>
  38
  39 /* This looks like a 100MB disk with one empty partition. */
  40 static unsigned char bootsector[512] = {
  41   0xfa, 0xb8, 0x00, 0x10, 0x8e, 0xd0, 0xbc, 0x00,
  42   0xb0, 0xb8, 0x00, 0x00, 0x8e, 0xd8, 0x8e, 0xc0,
  43   0xfb, 0xbe, 0x00, 0x7c, 0xbf, 0x00, 0x06, 0xb9,
  44   0x00, 0x02, 0xf3, 0xa4, 0xea, 0x21, 0x06, 0x00,
  45   0x00, 0xbe, 0xbe, 0x07, 0x38, 0x04, 0x75, 0x0b,
  46   0x83, 0xc6, 0x10, 0x81, 0xfe, 0xfe, 0x07, 0x75,
  47   0xf3, 0xeb, 0x16, 0xb4, 0x02, 0xb0, 0x01, 0xbb,
  48   0x00, 0x7c, 0xb2, 0x80, 0x8a, 0x74, 0x01, 0x8b,
  49   0x4c, 0x02, 0xcd, 0x13, 0xea, 0x00, 0x7c, 0x00,
  50   0x00, 0xeb, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00,
  51   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  52   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  53   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  54   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  55   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  56   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  57   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  58   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  59   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  60   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  61   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  62   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  63   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  64   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  65   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  66   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  67   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  68   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  69   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  70   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  71   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  72   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  73   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  74   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  75   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  76   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  77   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  78   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  79   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  80   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  81   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  82   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  83   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  84   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  85   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  86   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  87   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  88   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  89   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  90   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  91   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  92   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  93   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  94   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  95   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  96   0xe1, 0x5b, 0x02, 0x00, 0x00, 0x00, 0x00, 0x02,
  97   0x03, 0x00, 0x83, 0xbc, 0x31, 0x0c, 0x80, 0x00,
  98   0x00, 0x00, 0x01, 0x1f, 0x03, 0x00, 0x00, 0x00,
  99   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 100   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 101   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 102   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 103   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 104   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x55, 0xaa
 105 };
 106 static unsigned char data[104857600];
 107
 108 static void
 109 ansi_c_load (void)
 110 {
 111   memcpy (data, bootsector, sizeof bootsector);
 112 }
 113
 114 static void *
 115 ansi_c_open (int readonly)
 116 {
 117   return NBDKIT_HANDLE_NOT_NEEDED;
 118 }
 119
 120 static int64_t
 121 ansi_c_get_size (void *handle)
 122 {
 123   return (int64_t) sizeof (data);
 124 }
 125
 126 #define THREAD_MODEL NBDKIT_THREAD_MODEL_SERIALIZE_ALL_REQUESTS
 127
 128 static int
 129 ansi_c_pread (void *handle, void *buf, uint32_t count, uint64_t offset)
 130 {
 131   memcpy (buf, data+offset, count);
 132   return 0;
 133 }
 134
 135 /* Strictly speaking (and we're compiling with -pedantic, so we _are_
 136  * "strictly speaking"), ANSI C did not allow struct initialization
 137  * using labels.  However it was a common extension to C compilers of
 138  * the period.
 139  *
 140  * Therefore we rely here on the order of fields in struct
 141  * nbdkit_plugin.  But that's OK because of nbdkit's stable ABI
 142  * guarantee.
 143  *
 144  * If you are really writing an nbdkit plugin which can only use C90
 145  * then you are advised to find the extension to your compiler which
 146  * allows you to initialize named fields.
 147  */
 148 static struct nbdkit_plugin plugin = {
 149   0, 0, 0,                /* _struct_size, _api_version, _thread_model */
 150   "ansic",
 151   NULL,                   /* longname */
 152   "1.0",
 153   NULL,                   /* description */
 154   ansi_c_load,
 155   NULL,                   /* unload */
 156   NULL, NULL, NULL,       /* config, config_complete, config_help */
 157   ansi_c_open,
 158   NULL,                   /* close */
 159   ansi_c_get_size,
 160   NULL, NULL, NULL, NULL, /* can_write, can_flush, is_rotational, can_trim */
 161   ansi_c_pread
 162 };
 163
 164 NBDKIT_REGISTER_PLUGIN(plugin)