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annotate partition.c @ 31:5d6a841eef82

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/128 prescaler for adc
author Matt Johnston <matt@ucc.asn.au>
date Thu, 27 Jun 2013 00:12:32 +0800
parents 5f9a40d6991b
children
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19
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1
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2 /*
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3 * Copyright (c) 2006-2012 by Roland Riegel <[email protected]>
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4 *
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5 * This file is free software; you can redistribute it and/or modify
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6 * it under the terms of either the GNU General Public License version 2
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7 * or the GNU Lesser General Public License version 2.1, both as
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8 * published by the Free Software Foundation.
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9 */
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10
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11 #include "byteordering.h"
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12 #include "partition.h"
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13 #include "partition_config.h"
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14 #include "sd-reader_config.h"
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15
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16 #include <string.h>
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17
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18 #if USE_DYNAMIC_MEMORY
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19 #include <stdlib.h>
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20 #endif
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21
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22 /**
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23 * \addtogroup partition Partition table support
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24 *
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25 * Support for reading partition tables and access to partitions.
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26 *
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27 * @{
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28 */
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29 /**
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30 * \file
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31 * Partition table implementation (license: GPLv2 or LGPLv2.1)
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32 *
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33 * \author Roland Riegel
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34 */
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35
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36 /**
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37 * \addtogroup partition_config Configuration of partition table support
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38 * Preprocessor defines to configure the partition support.
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39 */
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40
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41 #if !USE_DYNAMIC_MEMORY
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42 static struct partition_struct partition_handles[PARTITION_COUNT];
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43 #endif
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44
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45 /**
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46 * Opens a partition.
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47 *
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48 * Opens a partition by its index number and returns a partition
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49 * handle which describes the opened partition.
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50 *
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51 * \note This function does not support extended partitions.
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52 *
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53 * \param[in] device_read A function pointer which is used to read from the disk.
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54 * \param[in] device_read_interval A function pointer which is used to read in constant intervals from the disk.
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55 * \param[in] device_write A function pointer which is used to write to the disk.
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56 * \param[in] device_write_interval A function pointer which is used to write a data stream to disk.
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57 * \param[in] index The index of the partition which should be opened, range 0 to 3.
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58 * A negative value is allowed as well. In this case, the partition opened is
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59 * not checked for existance, begins at offset zero, has a length of zero
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60 * and is of an unknown type. Use this in case you want to open the whole device
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61 * as a single partition (e.g. for "super floppy" use).
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62 * \returns 0 on failure, a partition descriptor on success.
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63 * \see partition_close
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64 */
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65 struct partition_struct* partition_open(device_read_t device_read, device_read_interval_t device_read_interval, device_write_t device_write, device_write_interval_t device_write_interval, int8_t index)
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66 {
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67 struct partition_struct* new_partition = 0;
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68 uint8_t buffer[0x10];
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69
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70 if(!device_read || !device_read_interval || index >= 4)
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71 return 0;
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72
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73 if(index >= 0)
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74 {
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75 /* read specified partition table index */
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76 if(!device_read(0x01be + index * 0x10, buffer, sizeof(buffer)))
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77 return 0;
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78
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79 /* abort on empty partition entry */
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80 if(buffer[4] == 0x00)
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81 return 0;
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82 }
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83
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84 /* allocate partition descriptor */
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85 #if USE_DYNAMIC_MEMORY
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86 new_partition = malloc(sizeof(*new_partition));
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87 if(!new_partition)
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88 return 0;
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89 #else
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90 new_partition = partition_handles;
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91 uint8_t i;
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92 for(i = 0; i < PARTITION_COUNT; ++i)
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93 {
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94 if(new_partition->type == PARTITION_TYPE_FREE)
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95 break;
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96
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97 ++new_partition;
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98 }
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99 if(i >= PARTITION_COUNT)
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100 return 0;
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101 #endif
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102
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103 memset(new_partition, 0, sizeof(*new_partition));
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104
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105 /* fill partition descriptor */
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106 new_partition->device_read = device_read;
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107 new_partition->device_read_interval = device_read_interval;
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108 new_partition->device_write = device_write;
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109 new_partition->device_write_interval = device_write_interval;
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110
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111 if(index >= 0)
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112 {
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113 new_partition->type = buffer[4];
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114 new_partition->offset = read32(&buffer[8]);
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115 new_partition->length = read32(&buffer[12]);
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116 }
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117 else
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118 {
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119 new_partition->type = 0xff;
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120 }
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121
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122 return new_partition;
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123 }
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124
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125 /**
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126 * Closes a partition.
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127 *
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128 * This function destroys a partition descriptor which was
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129 * previously obtained from a call to partition_open().
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130 * When this function returns, the given descriptor will be
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131 * invalid.
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132 *
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133 * \param[in] partition The partition descriptor to destroy.
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134 * \returns 0 on failure, 1 on success.
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135 * \see partition_open
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136 */
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137 uint8_t partition_close(struct partition_struct* partition)
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138 {
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139 if(!partition)
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140 return 0;
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141
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142 /* destroy partition descriptor */
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143 #if USE_DYNAMIC_MEMORY
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144 free(partition);
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145 #else
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146 partition->type = PARTITION_TYPE_FREE;
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147 #endif
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148
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149 return 1;
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150 }
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151
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152 /**
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153 * @}
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154 */
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155