1 | /*
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2 |
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3 | SD - a slightly more friendly wrapper for sdfatlib
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4 |
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5 | This library aims to expose a subset of SD card functionality
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6 | in the form of a higher level "wrapper" object.
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7 |
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8 | License: GNU General Public License V3
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9 | (Because sdfatlib is licensed with this.)
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10 |
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11 | (C) Copyright 2010 SparkFun Electronics
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12 |
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13 |
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14 | This library provides four key benefits:
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15 |
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16 | * Including `SD.h` automatically creates a global
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17 | `SD` object which can be interacted with in a similar
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18 | manner to other standard global objects like `Serial` and `Ethernet`.
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19 |
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20 | * Boilerplate initialisation code is contained in one method named
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21 | `begin` and no further objects need to be created in order to access
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22 | the SD card.
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23 |
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24 | * Calls to `open` can supply a full path name including parent
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25 | directories which simplifies interacting with files in subdirectories.
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26 |
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27 | * Utility methods are provided to determine whether a file exists
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28 | and to create a directory heirarchy.
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29 |
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30 |
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31 | Note however that not all functionality provided by the underlying
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32 | sdfatlib library is exposed.
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33 |
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34 | */
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35 |
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36 | /*
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37 |
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38 | Implementation Notes
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39 |
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40 | In order to handle multi-directory path traversal, functionality that
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41 | requires this ability is implemented as callback functions.
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42 |
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43 | Individual methods call the `walkPath` function which performs the actual
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44 | directory traversal (swapping between two different directory/file handles
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45 | along the way) and at each level calls the supplied callback function.
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46 |
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47 | Some types of functionality will take an action at each level (e.g. exists
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48 | or make directory) which others will only take an action at the bottom
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49 | level (e.g. open).
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50 |
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51 | */
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52 |
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53 | #include "SD.h"
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54 |
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55 | // Used by `getNextPathComponent`
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56 | #define MAX_COMPONENT_LEN 12 // What is max length?
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57 | #define PATH_COMPONENT_BUFFER_LEN MAX_COMPONENT_LEN+1
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58 |
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59 | bool getNextPathComponent(char *path, unsigned int *p_offset,
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60 | char *buffer) {
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61 | /*
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62 |
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63 | Parse individual path components from a path.
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64 |
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65 | e.g. after repeated calls '/foo/bar/baz' will be split
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66 | into 'foo', 'bar', 'baz'.
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67 |
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68 | This is similar to `strtok()` but copies the component into the
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69 | supplied buffer rather than modifying the original string.
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70 |
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71 |
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72 | `buffer` needs to be PATH_COMPONENT_BUFFER_LEN in size.
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73 |
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74 | `p_offset` needs to point to an integer of the offset at
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75 | which the previous path component finished.
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76 |
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77 | Returns `true` if more components remain.
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78 |
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79 | Returns `false` if this is the last component.
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80 | (This means path ended with 'foo' or 'foo/'.)
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81 |
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82 | */
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83 |
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84 | // TODO: Have buffer local to this function, so we know it's the
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85 | // correct length?
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86 |
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87 | int bufferOffset = 0;
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88 |
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89 | int offset = *p_offset;
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90 |
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91 | // Skip root or other separator
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92 | if (path[offset] == '/') {
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93 | offset++;
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94 | }
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95 |
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96 | // Copy the next next path segment
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97 | while (bufferOffset < MAX_COMPONENT_LEN
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98 | && (path[offset] != '/')
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99 | && (path[offset] != '\0')) {
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100 | buffer[bufferOffset++] = path[offset++];
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101 | }
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102 |
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103 | buffer[bufferOffset] = '\0';
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104 |
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105 | // Skip trailing separator so we can determine if this
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106 | // is the last component in the path or not.
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107 | if (path[offset] == '/') {
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108 | offset++;
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109 | }
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110 |
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111 | *p_offset = offset;
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112 |
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113 | return (path[offset] != '\0');
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114 | }
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115 |
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116 |
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117 |
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118 | boolean walkPath(char *filepath, SdFile& parentDir,
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119 | boolean (*callback)(SdFile& parentDir,
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120 | char *filePathComponent,
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121 | boolean isLastComponent,
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122 | void *object),
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123 | void *object = NULL) {
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124 | /*
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125 |
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126 | When given a file path (and parent directory--normally root),
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127 | this function traverses the directories in the path and at each
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128 | level calls the supplied callback function while also providing
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129 | the supplied object for context if required.
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130 |
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131 | e.g. given the path '/foo/bar/baz'
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132 | the callback would be called at the equivalent of
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133 | '/foo', '/foo/bar' and '/foo/bar/baz'.
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134 |
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135 | The implementation swaps between two different directory/file
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136 | handles as it traverses the directories and does not use recursion
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137 | in an attempt to use memory efficiently.
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138 |
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139 | If a callback wishes to stop the directory traversal it should
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140 | return false--in this case the function will stop the traversal,
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141 | tidy up and return false.
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142 |
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143 | If a directory path doesn't exist at some point this function will
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144 | also return false and not subsequently call the callback.
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145 |
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146 | If a directory path specified is complete, valid and the callback
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147 | did not indicate the traversal should be interrupted then this
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148 | function will return true.
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149 |
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150 | */
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151 |
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152 |
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153 | SdFile subfile1;
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154 | SdFile subfile2;
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155 |
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156 | char buffer[PATH_COMPONENT_BUFFER_LEN];
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157 |
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158 | unsigned int offset = 0;
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159 |
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160 | SdFile *p_parent;
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161 | SdFile *p_child;
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162 |
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163 | SdFile *p_tmp_sdfile;
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164 |
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165 | p_child = &subfile1;
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166 |
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167 | p_parent = &parentDir;
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168 |
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169 | while (true) {
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170 |
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171 | boolean moreComponents = getNextPathComponent(filepath, &offset, buffer);
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172 |
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173 | boolean shouldContinue = callback((*p_parent), buffer, !moreComponents, object);
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174 |
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175 | if (!shouldContinue) {
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176 | // TODO: Don't repeat this code?
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177 | // If it's one we've created then we
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178 | // don't need the parent handle anymore.
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179 | if (p_parent != &parentDir) {
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180 | (*p_parent).close();
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181 | }
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182 | return false;
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183 | }
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184 |
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185 | if (!moreComponents) {
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186 | break;
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187 | }
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188 |
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189 | boolean exists = (*p_child).open(*p_parent, buffer, O_RDONLY);
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190 |
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191 | // If it's one we've created then we
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192 | // don't need the parent handle anymore.
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193 | if (p_parent != &parentDir) {
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194 | (*p_parent).close();
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195 | }
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196 |
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197 | // Handle case when it doesn't exist and we can't continue...
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198 | if (exists) {
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199 | // We alternate between two file handles as we go down
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200 | // the path.
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201 | if (p_parent == &parentDir) {
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202 | p_parent = &subfile2;
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203 | }
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204 |
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205 | p_tmp_sdfile = p_parent;
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206 | p_parent = p_child;
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207 | p_child = p_tmp_sdfile;
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208 | } else {
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209 | return false;
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210 | }
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211 | }
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212 |
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213 | if (p_parent != &parentDir) {
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214 | (*p_parent).close(); // TODO: Return/ handle different?
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215 | }
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216 |
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217 | return true;
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218 | }
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219 |
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220 |
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221 |
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222 | /*
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223 |
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224 | The callbacks used to implement various functionality follow.
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225 |
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226 | Each callback is supplied with a parent directory handle,
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227 | character string with the name of the current file path component,
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228 | a flag indicating if this component is the last in the path and
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229 | a pointer to an arbitrary object used for context.
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230 |
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231 | */
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232 |
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233 | boolean callback_pathExists(SdFile& parentDir, char *filePathComponent,
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234 | boolean isLastComponent, void *object) {
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235 | /*
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236 |
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237 | Callback used to determine if a file/directory exists in parent
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238 | directory.
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239 |
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240 | Returns true if file path exists.
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241 |
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242 | */
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243 | SdFile child;
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244 |
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245 | boolean exists = child.open(parentDir, filePathComponent, O_RDONLY);
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246 |
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247 | if (exists) {
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248 | child.close();
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249 | }
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250 |
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251 | return exists;
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252 | }
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253 |
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254 |
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255 |
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256 | boolean callback_makeDirPath(SdFile& parentDir, char *filePathComponent,
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257 | boolean isLastComponent, void *object) {
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258 | /*
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259 |
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260 | Callback used to create a directory in the parent directory if
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261 | it does not already exist.
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262 |
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263 | Returns true if a directory was created or it already existed.
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264 |
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265 | */
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266 | boolean result = false;
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267 | SdFile child;
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268 |
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269 | result = callback_pathExists(parentDir, filePathComponent, isLastComponent, object);
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270 | if (!result) {
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271 | result = child.makeDir(parentDir, filePathComponent);
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272 | }
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273 |
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274 | return result;
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275 | }
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276 |
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277 |
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278 | /*
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279 |
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280 | boolean callback_openPath(SdFile& parentDir, char *filePathComponent,
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281 | boolean isLastComponent, void *object) {
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282 |
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283 | Callback used to open a file specified by a filepath that may
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284 | specify one or more directories above it.
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285 |
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286 | Expects the context object to be an instance of `SDClass` and
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287 | will use the `file` property of the instance to open the requested
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288 | file/directory with the associated file open mode property.
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289 |
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290 | Always returns true if the directory traversal hasn't reached the
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291 | bottom of the directory heirarchy.
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292 |
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293 | Returns false once the file has been opened--to prevent the traversal
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294 | from descending further. (This may be unnecessary.)
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295 |
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296 | if (isLastComponent) {
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297 | SDClass *p_SD = static_cast<SDClass*>(object);
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298 | p_SD->file.open(parentDir, filePathComponent, p_SD->fileOpenMode);
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299 | if (p_SD->fileOpenMode == FILE_WRITE) {
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300 | p_SD->file.seekSet(p_SD->file.fileSize());
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301 | }
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302 | // TODO: Return file open result?
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303 | return false;
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304 | }
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305 | return true;
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306 | }
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307 | */
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308 |
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309 |
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310 |
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311 | boolean callback_remove(SdFile& parentDir, char *filePathComponent,
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312 | boolean isLastComponent, void *object) {
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313 | if (isLastComponent) {
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314 | return SdFile::remove(parentDir, filePathComponent);
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315 | }
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316 | return true;
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317 | }
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318 |
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319 | boolean callback_rmdir(SdFile& parentDir, char *filePathComponent,
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320 | boolean isLastComponent, void *object) {
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321 | if (isLastComponent) {
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322 | SdFile f;
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323 | if (!f.open(parentDir, filePathComponent, O_READ)) return false;
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324 | return f.rmDir();
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325 | }
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326 | return true;
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327 | }
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328 |
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329 |
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330 |
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331 | /* Implementation of class used to create `SDCard` object. */
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332 |
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333 |
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334 |
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335 | boolean SDClass::begin(uint8_t csPin) {
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336 | /*
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337 |
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338 | Performs the initialisation required by the sdfatlib library.
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339 |
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340 | Return true if initialization succeeds, false otherwise.
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341 |
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342 | */
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343 | return card.init(SPI_HALF_SPEED, csPin) &&
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344 | volume.init(card) &&
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345 | root.openRoot(volume);
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346 | }
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347 |
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348 |
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349 |
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350 | // this little helper is used to traverse paths
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351 | SdFile SDClass::getParentDir(const char *filepath, int *index) {
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352 | // get parent directory
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353 | SdFile d1 = root; // start with the mostparent, root!
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354 | SdFile d2;
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355 |
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356 | // we'll use the pointers to swap between the two objects
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357 | SdFile *parent = &d1;
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358 | SdFile *subdir = &d2;
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359 |
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360 | const char *origpath = filepath;
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361 |
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362 | while (strchr(filepath, '/')) {
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363 |
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364 | // get rid of leading /'s
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365 | if (filepath[0] == '/') {
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366 | filepath++;
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367 | continue;
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368 | }
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369 |
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370 | if (! strchr(filepath, '/')) {
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371 | // it was in the root directory, so leave now
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372 | break;
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373 | }
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374 |
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375 | // extract just the name of the next subdirectory
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376 | uint8_t idx = strchr(filepath, '/') - filepath;
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377 | if (idx > 12)
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378 | idx = 12; // dont let them specify long names
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379 | char subdirname[13];
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380 | strncpy(subdirname, filepath, idx);
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381 | subdirname[idx] = 0;
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382 |
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383 | // close the subdir (we reuse them) if open
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384 | subdir->close();
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385 | if (! subdir->open(parent, subdirname, O_READ)) {
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386 | // failed to open one of the subdirectories
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387 | return SdFile();
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388 | }
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389 | // move forward to the next subdirectory
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390 | filepath += idx;
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391 |
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392 | // we reuse the objects, close it.
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393 | parent->close();
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394 |
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395 | // swap the pointers
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396 | SdFile *t = parent;
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397 | parent = subdir;
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398 | subdir = t;
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399 | }
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400 |
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401 | *index = (int)(filepath - origpath);
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402 | // parent is now the parent diretory of the file!
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403 | return *parent;
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404 | }
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405 |
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406 |
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407 | File SDClass::open(const char *filepath, uint8_t mode) {
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408 | /*
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409 |
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410 | Open the supplied file path for reading or writing.
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411 |
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412 | The file content can be accessed via the `file` property of
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413 | the `SDClass` object--this property is currently
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414 | a standard `SdFile` object from `sdfatlib`.
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415 |
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416 | Defaults to read only.
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417 |
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418 | If `write` is true, default action (when `append` is true) is to
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419 | append data to the end of the file.
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420 |
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421 | If `append` is false then the file will be truncated first.
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422 |
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423 | If the file does not exist and it is opened for writing the file
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424 | will be created.
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425 |
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426 | An attempt to open a file for reading that does not exist is an
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427 | error.
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428 |
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429 | */
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430 |
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431 | int pathidx;
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432 |
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433 | // do the interative search
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434 | SdFile parentdir = getParentDir(filepath, &pathidx);
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435 | // no more subdirs!
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436 |
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437 | filepath += pathidx;
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438 |
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439 | if (! filepath[0]) {
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440 | // it was the directory itself!
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441 | return File(parentdir, "/");
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442 | }
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443 |
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444 | // Open the file itself
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445 | SdFile file;
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446 |
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447 | // failed to open a subdir!
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448 | if (!parentdir.isOpen())
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449 | return File();
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450 |
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451 | // there is a special case for the Root directory since its a static dir
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452 | if (parentdir.isRoot()) {
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453 | if ( ! file.open(SD.root, filepath, mode)) {
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454 | // failed to open the file :(
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455 | return File();
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456 | }
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457 | // dont close the root!
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458 | } else {
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459 | if ( ! file.open(parentdir, filepath, mode)) {
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460 | return File();
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461 | }
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462 | // close the parent
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463 | parentdir.close();
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464 | }
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465 |
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466 | if (mode & (O_APPEND | O_WRITE))
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467 | file.seekSet(file.fileSize());
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468 | return File(file, filepath);
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469 | }
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470 |
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471 |
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472 | /*
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473 | File SDClass::open(char *filepath, uint8_t mode) {
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474 | //
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475 |
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476 | Open the supplied file path for reading or writing.
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477 |
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478 | The file content can be accessed via the `file` property of
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479 | the `SDClass` object--this property is currently
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480 | a standard `SdFile` object from `sdfatlib`.
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481 |
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482 | Defaults to read only.
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483 |
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484 | If `write` is true, default action (when `append` is true) is to
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485 | append data to the end of the file.
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486 |
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487 | If `append` is false then the file will be truncated first.
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488 |
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489 | If the file does not exist and it is opened for writing the file
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490 | will be created.
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491 |
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492 | An attempt to open a file for reading that does not exist is an
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493 | error.
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494 |
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495 | //
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496 |
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497 | // TODO: Allow for read&write? (Possibly not, as it requires seek.)
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498 |
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499 | fileOpenMode = mode;
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500 | walkPath(filepath, root, callback_openPath, this);
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501 |
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502 | return File();
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503 |
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504 | }
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505 | */
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506 |
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507 |
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508 | //boolean SDClass::close() {
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509 | // /*
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510 | //
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511 | // Closes the file opened by the `open` method.
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512 | //
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513 | // */
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514 | // file.close();
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515 | //}
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516 |
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517 |
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518 | boolean SDClass::exists(char *filepath) {
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519 | /*
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520 |
|
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521 | Returns true if the supplied file path exists.
|
---|
522 |
|
---|
523 | */
|
---|
524 | return walkPath(filepath, root, callback_pathExists);
|
---|
525 | }
|
---|
526 |
|
---|
527 |
|
---|
528 | //boolean SDClass::exists(char *filepath, SdFile& parentDir) {
|
---|
529 | // /*
|
---|
530 | //
|
---|
531 | // Returns true if the supplied file path rooted at `parentDir`
|
---|
532 | // exists.
|
---|
533 | //
|
---|
534 | // */
|
---|
535 | // return walkPath(filepath, parentDir, callback_pathExists);
|
---|
536 | //}
|
---|
537 |
|
---|
538 |
|
---|
539 | boolean SDClass::mkdir(char *filepath) {
|
---|
540 | /*
|
---|
541 |
|
---|
542 | Makes a single directory or a heirarchy of directories.
|
---|
543 |
|
---|
544 | A rough equivalent to `mkdir -p`.
|
---|
545 |
|
---|
546 | */
|
---|
547 | return walkPath(filepath, root, callback_makeDirPath);
|
---|
548 | }
|
---|
549 |
|
---|
550 | boolean SDClass::rmdir(char *filepath) {
|
---|
551 | /*
|
---|
552 |
|
---|
553 | Remove a single directory or a heirarchy of directories.
|
---|
554 |
|
---|
555 | A rough equivalent to `rm -rf`.
|
---|
556 |
|
---|
557 | */
|
---|
558 | return walkPath(filepath, root, callback_rmdir);
|
---|
559 | }
|
---|
560 |
|
---|
561 | boolean SDClass::remove(char *filepath) {
|
---|
562 | return walkPath(filepath, root, callback_remove);
|
---|
563 | }
|
---|
564 |
|
---|
565 |
|
---|
566 | // allows you to recurse into a directory
|
---|
567 | File File::openNextFile(uint8_t mode) {
|
---|
568 | dir_t p;
|
---|
569 |
|
---|
570 | //Serial.print("\t\treading dir...");
|
---|
571 | while (_file->readDir(&p) > 0) {
|
---|
572 |
|
---|
573 | // done if past last used entry
|
---|
574 | if (p.name[0] == DIR_NAME_FREE) {
|
---|
575 | //Serial.println("end");
|
---|
576 | return File();
|
---|
577 | }
|
---|
578 |
|
---|
579 | // skip deleted entry and entries for . and ..
|
---|
580 | if (p.name[0] == DIR_NAME_DELETED || p.name[0] == '.') {
|
---|
581 | //Serial.println("dots");
|
---|
582 | continue;
|
---|
583 | }
|
---|
584 |
|
---|
585 | // only list subdirectories and files
|
---|
586 | if (!DIR_IS_FILE_OR_SUBDIR(&p)) {
|
---|
587 | //Serial.println("notafile");
|
---|
588 | continue;
|
---|
589 | }
|
---|
590 |
|
---|
591 | // print file name with possible blank fill
|
---|
592 | SdFile f;
|
---|
593 | char name[13];
|
---|
594 | _file->dirName(p, name);
|
---|
595 | //Serial.print("try to open file ");
|
---|
596 | //Serial.println(name);
|
---|
597 |
|
---|
598 | if (f.open(_file, name, mode)) {
|
---|
599 | //Serial.println("OK!");
|
---|
600 | return File(f, name);
|
---|
601 | } else {
|
---|
602 | //Serial.println("ugh");
|
---|
603 | return File();
|
---|
604 | }
|
---|
605 | }
|
---|
606 |
|
---|
607 | //Serial.println("nothing");
|
---|
608 | return File();
|
---|
609 | }
|
---|
610 |
|
---|
611 | void File::rewindDirectory(void) {
|
---|
612 | if (isDirectory())
|
---|
613 | _file->rewind();
|
---|
614 | }
|
---|
615 |
|
---|
616 | SDClass SD;
|
---|