FreeCalypso > hg > fc-tourmaline

annotate src/ui/bmi/mmiBlkResources.c @ 230:baa738eeb842

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FCBM code implemented in first pass
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 01 May 2021 10:05:53 +0000
parents 67b91d34f75e
children
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1 /*******************************************************************************
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3 CONDAT (UK)
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5 ********************************************************************************
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7 This software product is the property of Condat (UK) Ltd and may not be
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8 disclosed to any third party without the express permission of the owner.
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10 ********************************************************************************
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12 $Project name: Basic MMI
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13 $Project code: BMI (6349)
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14 $Module: PhoneBook
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15 $File: MmiBlkResources.c
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16 $Revision: 1.0
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18 $Author: Condat(UK)
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19 $Date: 25/10/00
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21 ********************************************************************************
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23 Description:
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25 This modules provides, in conjunction with the MmiBlkManager module,
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26 the resource management facilities for the MMI.
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28 ********************************************************************************
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30 $History: MmiBlkResources.c
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32 25/10/00 Original Condat(UK) BMI version.
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33
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34 $End
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36 *******************************************************************************/
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39 /*******************************************************************************
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41 Include Files
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43 *******************************************************************************/
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45 #define ENTITY_MFW
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47 /* includes */
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48 #include <string.h>
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49 #include <stdio.h>
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50 #include <stdlib.h>
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52 #if defined (NEW_FRAME)
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54 #include "typedefs.h"
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55 #include "vsi.h"
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56 #include "pei.h"
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57 #include "custom.h"
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58 #include "gsm.h"
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60 #else
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62 #include "STDDEFS.H"
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63 #include "custom.h"
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64 #include "gsm.h"
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65 #include "vsi.h"
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67 #endif
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68 // #include <malloc.h>
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70 #include "MmiBlkResources.h"
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72 /*******************************************************************************
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74 Local Structures
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75
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76 *******************************************************************************/
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78 /* Define the control structures used to implement the block resource
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79 manager
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80 */
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81 #define RESOURCE_MANAGER_KEY 0x00BABE02L
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82 #define RESOURCE_SEARCH_LIMIT 4
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83
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84 typedef struct _tBlkEntry_
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85 {
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86 tBlkId BlkId;
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87 tBlkHandle BlkHandle;
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88 } tBlkEntry, *pBlkEntry;
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89
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90 typedef struct _tBlkControl_
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91 {
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92 long int BlkKey;
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93 tBlkHandle BlkBase;
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94 int BlkLength;
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95 pBlkEntry BlkStartPtr;
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96 tBlkHandle BlkMinAddress;
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97 tBlkHandle BlkMaxAddress;
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98 } tBlkControl, *pBlkControl;
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100
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101 /*******************************************************************************
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102
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103 Private Routines
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104
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105 *******************************************************************************/
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106
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107 /*******************************************************************************
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108
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109 $Function: ValidBlockResource
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110
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111 $Description: Verifies that the resource indicated by the handle is a valid
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112 resource.
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113
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114 $Returns: 0 If invalid, non-zero if valid.
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115
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116 $Arguments: BlkRsrc, handle of resource
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117
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118 *******************************************************************************/
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119
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120
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121 static int ValidBlockResource( tBlkHandle BlkRsrc )
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122 {
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123 pBlkControl BlkControl = (pBlkControl) BlkRsrc;
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124
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125 /* Check for non-NULL handle
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126 */
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127 if ( BlkControl == NULL )
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128 return 0;
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129
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130 /* Check key has been set up correctly
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131 */
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132 return ( BlkControl->BlkKey == RESOURCE_MANAGER_KEY );
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133 }
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134
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135
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136 /*******************************************************************************
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137
3
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138 Public Routines
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139
3
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140 *******************************************************************************/
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141
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142 /*******************************************************************************
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143
141
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144 $Function: mmibr_Initialise
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145
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146 $Description:
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147
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148 The initialisation routine must be called as part of the startup
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149 phase of the system, it will allocate working space for the block
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150 handler if required, and will initialise any structures required
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151 to maintain the corect operation of the functions. This routine
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152 must be called prior to invocation of any other block resource
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153 function
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154
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155 $Returns: Handle to a resource block, NULL if unsuccessful
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156
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157 $Arguments: BlkBase, Base address of the block of data relating
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158 to the resource
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159 NumEntries, number of entries associated with the resource
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160
3
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161 *******************************************************************************/
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162
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163 tBlkHandle mmibr_Initialise( tBlkHandle BlkBase, int NumEntries )
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164 {
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165 pBlkControl Blk;
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166 int i;
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167
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168 /* As part of the initialisation process, we need to allocate a
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169 block of memory in which to store the control information
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170 associated with this block resource manager
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171 */
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172 if ( ( Blk = (pBlkControl) ALLOC_MEMORY( sizeof(tBlkControl) ) ) != NULL )
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173 {
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174 /* Store the things we know straight off
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175 */
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176 Blk->BlkKey = RESOURCE_MANAGER_KEY;
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177 Blk->BlkBase = BlkBase;
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178 Blk->BlkLength = NumEntries;
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179 Blk->BlkStartPtr = (pBlkEntry) BlkBase;
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180
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181 /* In order to detect memory allocations, we scan the list
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182 of known entries, storing the maximum and minimum addresses
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183 in the list. This scan allows us to detect when allocated
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184 memory is being returned, since the address will be outside
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185 the contiguous memory block we are managing.
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186 */
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187 Blk->BlkMinAddress = Blk->BlkMaxAddress = BlkBase;
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188 for ( i = 0; i < NumEntries; i++ )
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189 {
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190 if ( Blk->BlkMaxAddress < Blk->BlkStartPtr[i].BlkHandle )
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191 Blk->BlkMaxAddress = Blk->BlkStartPtr[i].BlkHandle;
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192 }
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193 }
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194
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195 return Blk;
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196 }
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197
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198 /*******************************************************************************
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199
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200 $Function: mmibr_ShutDown
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201
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202 $Description:
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203
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204 The shutdown function can be called to free any allocations set up
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205 by the Initialise routine. In a running system this is unlikely to
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206 be called unless a catastrophic error has occurred and the system
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207 needs to be restarted.
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208
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209 $Returns: none.
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210
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211 $Arguments: Pointer to a block resource handle (ie ptr to ptr)
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212
3
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213 *******************************************************************************/
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214
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215 void mmibr_ShutDown( tBlkHandle *BlkRsrc )
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216 {
141
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217 /* Only allow the resource manager to be shutdown if the provided
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218 handle is consistent
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219 */
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220 if ( ValidBlockResource( *BlkRsrc ) )
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221 {
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222 free( *BlkRsrc );
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223 *BlkRsrc = NULL;
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224 }
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225 }
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226
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227 /*******************************************************************************
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228
141
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229 $Function: mmibr_Fetch
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230
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231 $Description:
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232
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233 We will adopt a mechanism where each block of data being provided
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234 will need to be returned to the block resource manager when it
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235 is no longer being used, this will provide an orthogonal approach
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236 when dealing with data coming from either ROM or dynamically
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237 allocated memory.
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238
141
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239 $Returns: pointer to resource, NULL if unsuccessful
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240
141
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241 $Arguments: BlkRsrc, resource handle created by mmibr_Initialise
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242 Id, identifier of the resource to be returned
92
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243
3
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244 *******************************************************************************/
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245
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246 tBlkHandle mmibr_Fetch( tBlkHandle BlkRsrc, tBlkId Id )
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247 {
141
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248 int Start, End, Search;
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249 tBlkId CurrentId;
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250 tBlkHandle SearchPtr;
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251
141
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252 /* convert the handle and verify it's valid
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253 */
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254 pBlkControl BlkControl = (pBlkControl) BlkRsrc;
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255 if ( ! ValidBlockResource( BlkRsrc ) )
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256 return NULL;
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257
141
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258 /* When locating a specific entry, we need to search the list of
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259 ids for one matching the input value. Since the Ids will be
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260 organised as an ordered list, very important that bit, we can
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261 perform a simple binary search to locate the items.
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262 */
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263 Start = 0;
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264 End = BlkControl->BlkLength - 1;
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265 SearchPtr = NULL;
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266 do
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267 {
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268 /* grab the entry midway between the current start and end
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269 */
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270 Search = Start + ((End - Start) >> 1);
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271 CurrentId = BlkControl->BlkStartPtr[Search].BlkId;
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272
141
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273 /* Binary chop the search space
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274 */
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275 if ( CurrentId == Id )
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276 {
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277 /* Found a match, grab handle and terminate search
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278 */
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279 SearchPtr = BlkControl->BlkStartPtr[Search].BlkHandle;
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280 Start = End;
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281 }
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282 else if ( CurrentId > Id )
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283 {
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284 /* Not got a match, but it's not in the top half so move
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285 the End pointer down
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286 */
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287 End = Search;
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288 }
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289 else
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290 {
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291 /* Not got a match, but it's not in the bottom half so
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292 move the Start pointer up
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293 */
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294 Start = Search;
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295 }
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296
141
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297 /* when we get down to the last three or four entries, just
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298 search linearly to solve it, this is generally quicker for
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299 a small number of entries than continuing the binary chop
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300 */
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301 if ( ( End - Start ) < RESOURCE_SEARCH_LIMIT )
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302 {
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303 /* search quickly through the possibles
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304 */
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305 for ( Search = Start; Search <= End; Search++ )
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306 if ( Id == BlkControl->BlkStartPtr[Search].BlkId )
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307 SearchPtr = BlkControl->BlkStartPtr[Search].BlkHandle;
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308
141
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309 /* And terminate the binary chop
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310 */
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311 Start = End;
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312 }
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313
141
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314 } while ( Start != End );
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315
141
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316 return SearchPtr;
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317 }
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318
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319 /*******************************************************************************
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320
3
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321 End of File
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322
3
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323 *******************************************************************************/