uspace/app/init/untar.c

   1 /*
   2  * Copyright (c) 2018 Martin Decky
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * - Redistributions of source code must retain the above copyright
  10  *   notice, this list of conditions and the following disclaimer.
  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  * - The name of the author may not be used to endorse or promote products
  15  *   derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 /** @addtogroup init
  30  * @{
  31  */
  32 /**
  33  * @file
  34  */
  35
  36 #include <stdio.h>
  37 #include <stdbool.h>
  38 #include <errno.h>
  39 #include <loc.h>
  40 #include <untar.h>
  41 #include <block.h>
  42 #include "init.h"
  43 #include "untar.h"
  44
  45 typedef struct {
  46         const char *dev;
  47
  48         service_id_t sid;
  49         aoff64_t offset;
  50 } tar_state_t;
  51
  52 static int bd_tar_open(tar_file_t *tar)
  53 {
  54         tar_state_t *state = (tar_state_t *) tar->data;
  55
  56         errno_t ret = loc_service_get_id(state->dev, &state->sid,
  57             IPC_FLAG_BLOCKING);
  58         if (ret != EOK)
  59                 return ret;
  60
  61         ret = block_init(state->sid, 4096);
  62         if (ret != EOK)
  63                 return ret;
  64
  65         state->offset = 0;
  66         return EOK;
  67 }
  68
  69 static void bd_tar_close(tar_file_t *tar)
  70 {
  71         tar_state_t *state = (tar_state_t *) tar->data;
  72         block_fini(state->sid);
  73 }
  74
  75 static size_t bd_tar_read(tar_file_t *tar, void *data, size_t size)
  76 {
  77         tar_state_t *state = (tar_state_t *) tar->data;
  78
  79         if (block_read_bytes_direct(state->sid, state->offset, size,
  80             data) != EOK)
  81                 return 0;
  82
  83         state->offset += size;
  84         return size;
  85 }
  86
  87 static void bd_tar_vreport(tar_file_t *tar, const char *fmt, va_list args)
  88 {
  89         vprintf(fmt, args);
  90 }
  91
  92 tar_file_t tar = {
  93         .open = bd_tar_open,
  94         .close = bd_tar_close,
  95
  96         .read = bd_tar_read,
  97         .vreport = bd_tar_vreport
  98 };
  99
 100 bool bd_untar(const char *dev)
 101 {
 102         tar_state_t state;
 103         state.dev = dev;
 104
 105         tar.data = (void *) &state;
 106         return (untar(&tar) == EOK);
 107 }
 108
 109 /** @}
 110  */