1 | #include "port_before.h" |
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2 | |
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3 | /*- |
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4 | * Copyright (c) 1990, 1993, 1994 |
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5 | * The Regents of the University of California. All rights reserved. |
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6 | * |
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7 | * This code is derived from software contributed to Berkeley by |
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8 | * Mike Olson. |
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9 | * |
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10 | * Redistribution and use in source and binary forms, with or without |
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11 | * modification, are permitted provided that the following conditions |
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12 | * are met: |
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13 | * 1. Redistributions of source code must retain the above copyright |
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14 | * notice, this list of conditions and the following disclaimer. |
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15 | * 2. Redistributions in binary form must reproduce the above copyright |
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16 | * notice, this list of conditions and the following disclaimer in the |
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17 | * documentation and/or other materials provided with the distribution. |
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18 | * 4. Neither the name of the University nor the names of its contributors |
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19 | * may be used to endorse or promote products derived from this software |
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20 | * without specific prior written permission. |
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21 | * |
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22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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32 | * SUCH DAMAGE. |
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33 | */ |
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34 | |
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35 | #if defined(LIBC_SCCS) && !defined(lint) |
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36 | static char sccsid[] = "@(#)bt_conv.c 8.5 (Berkeley) 8/17/94"; |
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37 | #endif /* LIBC_SCCS and not lint */ |
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38 | #include <sys/cdefs.h> |
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39 | __FBSDID("$FreeBSD$"); |
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40 | |
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41 | #include <rtems/bsd/sys/param.h> |
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42 | |
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43 | #include <stdio.h> |
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44 | |
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45 | #include <db.h> |
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46 | #include "btree.h" |
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47 | |
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48 | static void mswap(PAGE *); |
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49 | |
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50 | /* |
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51 | * __BT_BPGIN, __BT_BPGOUT -- |
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52 | * Convert host-specific number layout to/from the host-independent |
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53 | * format stored on disk. |
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54 | * |
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55 | * Parameters: |
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56 | * t: tree |
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57 | * pg: page number |
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58 | * h: page to convert |
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59 | */ |
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60 | void |
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61 | __bt_pgin(void *t, pgno_t pg, void *pp) |
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62 | { |
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63 | PAGE *h; |
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64 | indx_t i, top; |
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65 | u_char flags; |
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66 | char *p; |
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67 | |
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68 | if (!F_ISSET(((BTREE *)t), B_NEEDSWAP)) |
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69 | return; |
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70 | if (pg == P_META) { |
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71 | mswap(pp); |
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72 | return; |
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73 | } |
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74 | |
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75 | h = pp; |
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76 | M_32_SWAP(h->pgno); |
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77 | M_32_SWAP(h->prevpg); |
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78 | M_32_SWAP(h->nextpg); |
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79 | M_32_SWAP(h->flags); |
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80 | M_16_SWAP(h->lower); |
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81 | M_16_SWAP(h->upper); |
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82 | |
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83 | top = NEXTINDEX(h); |
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84 | if ((h->flags & P_TYPE) == P_BINTERNAL) |
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85 | for (i = 0; i < top; i++) { |
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86 | M_16_SWAP(h->linp[i]); |
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87 | p = (char *)GETBINTERNAL(h, i); |
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88 | P_32_SWAP(p); |
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89 | p += sizeof(u_int32_t); |
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90 | P_32_SWAP(p); |
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91 | p += sizeof(pgno_t); |
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92 | if (*(u_char *)p & P_BIGKEY) { |
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93 | p += sizeof(u_char); |
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94 | P_32_SWAP(p); |
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95 | p += sizeof(pgno_t); |
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96 | P_32_SWAP(p); |
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97 | } |
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98 | } |
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99 | else if ((h->flags & P_TYPE) == P_BLEAF) |
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100 | for (i = 0; i < top; i++) { |
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101 | M_16_SWAP(h->linp[i]); |
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102 | p = (char *)GETBLEAF(h, i); |
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103 | P_32_SWAP(p); |
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104 | p += sizeof(u_int32_t); |
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105 | P_32_SWAP(p); |
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106 | p += sizeof(u_int32_t); |
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107 | flags = *(u_char *)p; |
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108 | if (flags & (P_BIGKEY | P_BIGDATA)) { |
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109 | p += sizeof(u_char); |
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110 | if (flags & P_BIGKEY) { |
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111 | P_32_SWAP(p); |
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112 | p += sizeof(pgno_t); |
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113 | P_32_SWAP(p); |
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114 | } |
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115 | if (flags & P_BIGDATA) { |
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116 | p += sizeof(u_int32_t); |
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117 | P_32_SWAP(p); |
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118 | p += sizeof(pgno_t); |
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119 | P_32_SWAP(p); |
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120 | } |
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121 | } |
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122 | } |
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123 | } |
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124 | |
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125 | void |
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126 | __bt_pgout(void *t, pgno_t pg, void *pp) |
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127 | { |
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128 | PAGE *h; |
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129 | indx_t i, top; |
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130 | u_char flags; |
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131 | char *p; |
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132 | |
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133 | if (!F_ISSET(((BTREE *)t), B_NEEDSWAP)) |
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134 | return; |
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135 | if (pg == P_META) { |
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136 | mswap(pp); |
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137 | return; |
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138 | } |
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139 | |
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140 | h = pp; |
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141 | top = NEXTINDEX(h); |
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142 | if ((h->flags & P_TYPE) == P_BINTERNAL) |
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143 | for (i = 0; i < top; i++) { |
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144 | p = (char *)GETBINTERNAL(h, i); |
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145 | P_32_SWAP(p); |
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146 | p += sizeof(u_int32_t); |
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147 | P_32_SWAP(p); |
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148 | p += sizeof(pgno_t); |
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149 | if (*(u_char *)p & P_BIGKEY) { |
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150 | p += sizeof(u_char); |
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151 | P_32_SWAP(p); |
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152 | p += sizeof(pgno_t); |
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153 | P_32_SWAP(p); |
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154 | } |
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155 | M_16_SWAP(h->linp[i]); |
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156 | } |
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157 | else if ((h->flags & P_TYPE) == P_BLEAF) |
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158 | for (i = 0; i < top; i++) { |
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159 | p = (char *)GETBLEAF(h, i); |
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160 | P_32_SWAP(p); |
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161 | p += sizeof(u_int32_t); |
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162 | P_32_SWAP(p); |
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163 | p += sizeof(u_int32_t); |
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164 | flags = *(u_char *)p; |
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165 | if (flags & (P_BIGKEY | P_BIGDATA)) { |
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166 | p += sizeof(u_char); |
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167 | if (flags & P_BIGKEY) { |
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168 | P_32_SWAP(p); |
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169 | p += sizeof(pgno_t); |
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170 | P_32_SWAP(p); |
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171 | } |
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172 | if (flags & P_BIGDATA) { |
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173 | p += sizeof(u_int32_t); |
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174 | P_32_SWAP(p); |
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175 | p += sizeof(pgno_t); |
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176 | P_32_SWAP(p); |
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177 | } |
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178 | } |
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179 | M_16_SWAP(h->linp[i]); |
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180 | } |
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181 | |
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182 | M_32_SWAP(h->pgno); |
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183 | M_32_SWAP(h->prevpg); |
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184 | M_32_SWAP(h->nextpg); |
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185 | M_32_SWAP(h->flags); |
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186 | M_16_SWAP(h->lower); |
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187 | M_16_SWAP(h->upper); |
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188 | } |
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189 | |
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190 | /* |
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191 | * MSWAP -- Actually swap the bytes on the meta page. |
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192 | * |
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193 | * Parameters: |
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194 | * p: page to convert |
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195 | */ |
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196 | static void |
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197 | mswap(PAGE *pg) |
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198 | { |
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199 | char *p; |
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200 | |
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201 | p = (char *)pg; |
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202 | P_32_SWAP(p); /* magic */ |
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203 | p += sizeof(u_int32_t); |
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204 | P_32_SWAP(p); /* version */ |
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205 | p += sizeof(u_int32_t); |
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206 | P_32_SWAP(p); /* psize */ |
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207 | p += sizeof(u_int32_t); |
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208 | P_32_SWAP(p); /* free */ |
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209 | p += sizeof(u_int32_t); |
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210 | P_32_SWAP(p); /* nrecs */ |
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211 | p += sizeof(u_int32_t); |
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212 | P_32_SWAP(p); /* flags */ |
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213 | p += sizeof(u_int32_t); |
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214 | } |
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