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1 | e4d5639d | Amit Shah | /*
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2 | e4d5639d | Amit Shah | * Helpers for getting linearized buffers from iov / filling buffers into iovs
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3 | e4d5639d | Amit Shah | *
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4 | e4d5639d | Amit Shah | * Copyright IBM, Corp. 2007, 2008
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5 | e4d5639d | Amit Shah | * Copyright (C) 2010 Red Hat, Inc.
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6 | e4d5639d | Amit Shah | *
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7 | e4d5639d | Amit Shah | * Author(s):
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8 | e4d5639d | Amit Shah | * Anthony Liguori <aliguori@us.ibm.com>
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9 | e4d5639d | Amit Shah | * Amit Shah <amit.shah@redhat.com>
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10 | e4d5639d | Amit Shah | *
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11 | e4d5639d | Amit Shah | * This work is licensed under the terms of the GNU GPL, version 2. See
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12 | e4d5639d | Amit Shah | * the COPYING file in the top-level directory.
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13 | e4d5639d | Amit Shah | */
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14 | e4d5639d | Amit Shah | |
15 | e4d5639d | Amit Shah | #include "iov.h" |
16 | e4d5639d | Amit Shah | |
17 | 348e7b8d | Hannes Reinecke | size_t iov_from_buf(struct iovec *iov, unsigned int iov_cnt, |
18 | 348e7b8d | Hannes Reinecke | const void *buf, size_t iov_off, size_t size) |
19 | e4d5639d | Amit Shah | { |
20 | 348e7b8d | Hannes Reinecke | size_t iovec_off, buf_off; |
21 | e4d5639d | Amit Shah | unsigned int i; |
22 | e4d5639d | Amit Shah | |
23 | 348e7b8d | Hannes Reinecke | iovec_off = 0;
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24 | 348e7b8d | Hannes Reinecke | buf_off = 0;
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25 | 348e7b8d | Hannes Reinecke | for (i = 0; i < iov_cnt && size; i++) { |
26 | 348e7b8d | Hannes Reinecke | if (iov_off < (iovec_off + iov[i].iov_len)) {
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27 | 348e7b8d | Hannes Reinecke | size_t len = MIN((iovec_off + iov[i].iov_len) - iov_off, size); |
28 | e4d5639d | Amit Shah | |
29 | 348e7b8d | Hannes Reinecke | memcpy(iov[i].iov_base + (iov_off - iovec_off), buf + buf_off, len); |
30 | e4d5639d | Amit Shah | |
31 | 348e7b8d | Hannes Reinecke | buf_off += len; |
32 | 348e7b8d | Hannes Reinecke | iov_off += len; |
33 | 348e7b8d | Hannes Reinecke | size -= len; |
34 | 348e7b8d | Hannes Reinecke | } |
35 | 348e7b8d | Hannes Reinecke | iovec_off += iov[i].iov_len; |
36 | e4d5639d | Amit Shah | } |
37 | 348e7b8d | Hannes Reinecke | return buf_off;
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38 | e4d5639d | Amit Shah | } |
39 | fa6111f2 | Amit Shah | |
40 | 348e7b8d | Hannes Reinecke | size_t iov_to_buf(const struct iovec *iov, const unsigned int iov_cnt, |
41 | 348e7b8d | Hannes Reinecke | void *buf, size_t iov_off, size_t size)
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42 | fa6111f2 | Amit Shah | { |
43 | fa6111f2 | Amit Shah | uint8_t *ptr; |
44 | 348e7b8d | Hannes Reinecke | size_t iovec_off, buf_off; |
45 | fa6111f2 | Amit Shah | unsigned int i; |
46 | fa6111f2 | Amit Shah | |
47 | fa6111f2 | Amit Shah | ptr = buf; |
48 | 348e7b8d | Hannes Reinecke | iovec_off = 0;
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49 | fa6111f2 | Amit Shah | buf_off = 0;
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50 | 348e7b8d | Hannes Reinecke | for (i = 0; i < iov_cnt && size; i++) { |
51 | 348e7b8d | Hannes Reinecke | if (iov_off < (iovec_off + iov[i].iov_len)) {
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52 | 348e7b8d | Hannes Reinecke | size_t len = MIN((iovec_off + iov[i].iov_len) - iov_off , size); |
53 | fa6111f2 | Amit Shah | |
54 | 348e7b8d | Hannes Reinecke | memcpy(ptr + buf_off, iov[i].iov_base + (iov_off - iovec_off), len); |
55 | fa6111f2 | Amit Shah | |
56 | fa6111f2 | Amit Shah | buf_off += len; |
57 | 348e7b8d | Hannes Reinecke | iov_off += len; |
58 | fa6111f2 | Amit Shah | size -= len; |
59 | fa6111f2 | Amit Shah | } |
60 | 348e7b8d | Hannes Reinecke | iovec_off += iov[i].iov_len; |
61 | 8d15028e | Gerd Hoffmann | } |
62 | 8d15028e | Gerd Hoffmann | return buf_off;
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63 | 8d15028e | Gerd Hoffmann | } |
64 | 8d15028e | Gerd Hoffmann | |
65 | 8d15028e | Gerd Hoffmann | size_t iov_clear(const struct iovec *iov, const unsigned int iov_cnt, |
66 | 8d15028e | Gerd Hoffmann | size_t iov_off, size_t size) |
67 | 8d15028e | Gerd Hoffmann | { |
68 | 8d15028e | Gerd Hoffmann | size_t iovec_off, buf_off; |
69 | 8d15028e | Gerd Hoffmann | unsigned int i; |
70 | 8d15028e | Gerd Hoffmann | |
71 | 8d15028e | Gerd Hoffmann | iovec_off = 0;
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72 | 8d15028e | Gerd Hoffmann | buf_off = 0;
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73 | 8d15028e | Gerd Hoffmann | for (i = 0; i < iov_cnt && size; i++) { |
74 | 8d15028e | Gerd Hoffmann | if (iov_off < (iovec_off + iov[i].iov_len)) {
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75 | 8d15028e | Gerd Hoffmann | size_t len = MIN((iovec_off + iov[i].iov_len) - iov_off , size); |
76 | 8d15028e | Gerd Hoffmann | |
77 | 8d15028e | Gerd Hoffmann | memset(iov[i].iov_base + (iov_off - iovec_off), 0, len);
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78 | 8d15028e | Gerd Hoffmann | |
79 | 8d15028e | Gerd Hoffmann | buf_off += len; |
80 | 8d15028e | Gerd Hoffmann | iov_off += len; |
81 | 8d15028e | Gerd Hoffmann | size -= len; |
82 | 8d15028e | Gerd Hoffmann | } |
83 | 8d15028e | Gerd Hoffmann | iovec_off += iov[i].iov_len; |
84 | fa6111f2 | Amit Shah | } |
85 | fa6111f2 | Amit Shah | return buf_off;
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86 | fa6111f2 | Amit Shah | } |
87 | fa6111f2 | Amit Shah | |
88 | 348e7b8d | Hannes Reinecke | size_t iov_size(const struct iovec *iov, const unsigned int iov_cnt) |
89 | fa6111f2 | Amit Shah | { |
90 | fa6111f2 | Amit Shah | size_t len; |
91 | fa6111f2 | Amit Shah | unsigned int i; |
92 | fa6111f2 | Amit Shah | |
93 | fa6111f2 | Amit Shah | len = 0;
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94 | 348e7b8d | Hannes Reinecke | for (i = 0; i < iov_cnt; i++) { |
95 | fa6111f2 | Amit Shah | len += iov[i].iov_len; |
96 | fa6111f2 | Amit Shah | } |
97 | fa6111f2 | Amit Shah | return len;
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98 | fa6111f2 | Amit Shah | } |
99 | 3a1dca94 | Gerd Hoffmann | |
100 | 3a1dca94 | Gerd Hoffmann | void iov_hexdump(const struct iovec *iov, const unsigned int iov_cnt, |
101 | 3a1dca94 | Gerd Hoffmann | FILE *fp, const char *prefix, size_t limit) |
102 | 3a1dca94 | Gerd Hoffmann | { |
103 | 3a1dca94 | Gerd Hoffmann | unsigned int i, v, b; |
104 | 3a1dca94 | Gerd Hoffmann | uint8_t *c; |
105 | 3a1dca94 | Gerd Hoffmann | |
106 | 3a1dca94 | Gerd Hoffmann | c = iov[0].iov_base;
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107 | 3a1dca94 | Gerd Hoffmann | for (i = 0, v = 0, b = 0; b < limit; i++, b++) { |
108 | 3a1dca94 | Gerd Hoffmann | if (i == iov[v].iov_len) {
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109 | 3a1dca94 | Gerd Hoffmann | i = 0; v++;
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110 | 3a1dca94 | Gerd Hoffmann | if (v == iov_cnt) {
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111 | 3a1dca94 | Gerd Hoffmann | break;
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112 | 3a1dca94 | Gerd Hoffmann | } |
113 | 3a1dca94 | Gerd Hoffmann | c = iov[v].iov_base; |
114 | 3a1dca94 | Gerd Hoffmann | } |
115 | 3a1dca94 | Gerd Hoffmann | if ((b % 16) == 0) { |
116 | 3a1dca94 | Gerd Hoffmann | fprintf(fp, "%s: %04x:", prefix, b);
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117 | 3a1dca94 | Gerd Hoffmann | } |
118 | 3a1dca94 | Gerd Hoffmann | if ((b % 4) == 0) { |
119 | 3a1dca94 | Gerd Hoffmann | fprintf(fp, " ");
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120 | 3a1dca94 | Gerd Hoffmann | } |
121 | 3a1dca94 | Gerd Hoffmann | fprintf(fp, " %02x", c[i]);
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122 | 3a1dca94 | Gerd Hoffmann | if ((b % 16) == 15) { |
123 | 3a1dca94 | Gerd Hoffmann | fprintf(fp, "\n");
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124 | 3a1dca94 | Gerd Hoffmann | } |
125 | 3a1dca94 | Gerd Hoffmann | } |
126 | 3a1dca94 | Gerd Hoffmann | if ((b % 16) != 0) { |
127 | 3a1dca94 | Gerd Hoffmann | fprintf(fp, "\n");
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128 | 3a1dca94 | Gerd Hoffmann | } |
129 | 3a1dca94 | Gerd Hoffmann | } |