| 1 | /*
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| 2 | * Copyright (c) 2011 Maurizio Lombardi
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup fs
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| 30 | * @{
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| 31 | */
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| 32 |
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| 33 | #include <byteorder.h>
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| 34 | #include <assert.h>
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| 35 | #include <errno.h>
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| 36 | #include "mfs.h"
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| 37 | #include "mfs_utils.h"
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| 38 |
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| 39 | uint16_t conv16(bool native, uint16_t n)
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| 40 | {
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| 41 | if (native)
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| 42 | return n;
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| 43 |
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| 44 | return uint16_t_byteorder_swap(n);
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| 45 | }
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| 46 |
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| 47 | uint32_t conv32(bool native, uint32_t n)
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| 48 | {
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| 49 | if (native)
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| 50 | return n;
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| 51 |
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| 52 | return uint32_t_byteorder_swap(n);
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| 53 | }
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| 54 |
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| 55 | uint64_t conv64(bool native, uint64_t n)
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| 56 | {
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| 57 | if (native)
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| 58 | return n;
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| 59 |
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| 60 | return uint64_t_byteorder_swap(n);
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| 61 | }
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| 62 |
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| 63 | /*
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| 64 | *Read an indirect block from disk and convert its
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| 65 | *content to the native endian format.
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| 66 | */
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| 67 | int
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| 68 | read_ind_block(void *data, struct mfs_instance *inst,
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| 69 | uint32_t block, mfs_version_t version)
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| 70 | {
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| 71 | int rc;
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| 72 | unsigned i;
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| 73 | block_t *b;
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| 74 | uint32_t *ptr32;
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| 75 | uint16_t *ptr16;
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| 76 |
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| 77 | assert(inst);
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| 78 | devmap_handle_t handle = inst->handle;
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| 79 | struct mfs_sb_info *sbi = inst->sbi;
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| 80 |
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| 81 | assert(sbi);
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| 82 |
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| 83 | rc = block_get(&b, handle, block, BLOCK_FLAGS_NONE);
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| 84 |
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| 85 | if (rc != EOK)
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| 86 | goto out;
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| 87 |
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| 88 | if (version == MFS_VERSION_V1) {
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| 89 | uint16_t *p = b->data;
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| 90 | ptr16 = data;
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| 91 | for (i = 0; i < sbi->block_size / sizeof(uint16_t); ++i)
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| 92 | ptr16[i] = conv16(sbi->native, p[i]);
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| 93 | } else {
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| 94 | uint32_t *p = b->data;
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| 95 | ptr32 = data;
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| 96 | for (i = 0; i < sbi->block_size / sizeof(uint32_t); ++i)
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| 97 | ptr32[i] = conv32(sbi->native, p[i]);
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| 98 |
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| 99 | }
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| 100 |
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| 101 | rc = EOK;
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| 102 |
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| 103 | out:
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| 104 | block_put(b);
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| 105 | return rc;
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| 106 | }
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| 107 |
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| 108 | /**
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| 109 | * @}
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| 110 | */
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| 111 |
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