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annotate packages/net/common/current/src/tftp_dummy_file.c @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
parents
children 7c34839e7e97
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1 //==========================================================================
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2 //
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3 // lib/tftp_dummy_file.c
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4 //
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5 // Dummy [in memory] file I/O functions
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6 //
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7 //==========================================================================
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8 //####BSDCOPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 //
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12 // Portions of this software may have been derived from OpenBSD or other sources,
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13 // and are covered by the appropriate copyright disclaimers included herein.
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14 //
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15 // -------------------------------------------
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16 //
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17 //####BSDCOPYRIGHTEND####
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18 //==========================================================================
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19 //#####DESCRIPTIONBEGIN####
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20 //
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21 // Author(s): gthomas
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22 // Contributors: gthomas
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23 // Date: 2000-04-06
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24 // Purpose:
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25 // Description:
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26 //
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27 //
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28 //####DESCRIPTIONEND####
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29 //
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30 //==========================================================================
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31
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32 // TFTP file support - minimal "dummy" version
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33
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34 #include <network.h>
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35 #include <tftp_support.h>
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36
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37 static int dummy_open(const char *, int);
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38 static int dummy_close(int);
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39 static int dummy_write(int, const void *, int);
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40 static int dummy_read(int, void *, int);
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41
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42 struct tftpd_fileops dummy_fileops = {
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43 dummy_open, dummy_close, dummy_write, dummy_read
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44 };
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45
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46 struct _file_info;
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47 struct _file {
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48 unsigned char *pos, *eof;
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49 int flags;
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50 int mode;
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51 struct _file_info *file;
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52 };
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53 #define FILE_OPEN 0x0001
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54
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55 #define NUM_FILES 8
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56 static struct _file files[NUM_FILES];
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57
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58 struct _file_info {
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59 char *name;
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60 unsigned char *data;
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61 int length, size;
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62 };
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63
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64 // TEMP
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65 static char _uu_data[] = "This is a test\n\
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66 Four score and seven years ago,\n\
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67 our forefathers brought forth a new nation,\n\
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68 conceived in liberty and dedicated to the\n\
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69 proposition that all men are created equal.\n\
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70 Now we are engaged in a great civil war, testing\n\
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71 whether that nation, or any nation so conceived\n\
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72 and so dedicated, can long endure.\n\
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73 1111111111111111111111111111111111\n\
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74 2222222222222222222222222222222222\n\
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75 3333333333333333333333333333333333\n\
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76 4444444444444444444444444444444444\n\
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77 5555555555555555555555555555555555\n\
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78 6666666666666666666666666666666666\n\
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79 ";
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80
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81 static char _f0_data[1024*1024];
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82 static char _f1_data[1024*1024];
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83 static char _f2_data[1024*1024];
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84
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85 static char _name0[256] = "", _name1[256] = "", _name2[256] = "";
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86
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87 static struct _file_info file_list[] = {
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88 { "uu", _uu_data, sizeof(_uu_data)-1, sizeof(_uu_data)-1},
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89 { _name0, _f0_data, 0, sizeof(_f0_data)}, // Empty file
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90 { _name1, _f1_data, 0, sizeof(_f1_data)}, // Empty file
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91 { _name2, _f2_data, 0, sizeof(_f2_data)}, // Empty file
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92 { 0, 0, 0} // End of list
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93 };
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94
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95 static inline struct _file *
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96 dummy_fp(int fd)
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97 {
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98 struct _file *fp;
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99 if ((fd < 0) || (fd >= NUM_FILES)) return (struct _file *)0;
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100 fp = &files[fd];
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101 if (!(fp->flags & FILE_OPEN)) return (struct _file *)0;
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102 return fp;
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103 }
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104
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105 static int
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106 dummy_open(const char *fn, int flags)
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107 {
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108 int res = -1;
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109 int fd;
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110 struct _file *fp;
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111 struct _file_info *fi;
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112
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113 fp = files;
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114 for (fd = 0; fd < NUM_FILES; fd++, fp++) {
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115 if (!(fp->flags & FILE_OPEN)) break;
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116 }
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117 if (fd == NUM_FILES) {
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118 return -1; // No free files
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119 }
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120 if (flags & O_RDONLY) {
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121 // Search for an extant file
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122 fi = file_list;
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123 while (fi->name) {
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124 if (strcmp(fi->name, fn) == 0) {
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125 // Found it!
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126 fp->pos = fi->data;
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127 fp->eof = fi->data + fi->length;
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128 fp->flags = FILE_OPEN;
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129 fp->mode = flags;
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130 return fd;
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131 }
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132 fi++;
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133 }
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134 } else {
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135 // Search for a non-existant file
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136 fi = file_list;
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137 while (fi->name) {
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138 if (fi->name[0] == '\0' || strcmp(fi->name, fn) == 0) {
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139 if ( !fi->name[0] )
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140 // Empty slot found
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141 strcpy(fi->name, fn);
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142 fp->pos = fi->data;
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143 fp->eof = fi->data + fi->size;
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144 fp->file = fi; // So we can update file info later
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145 fp->mode = flags;
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146 fp->flags = FILE_OPEN;
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147 return fd;
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148 }
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149 fi++;
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150 }
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151 }
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152 // No such file
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153 return res;
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154 }
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155
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156 static int
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157 dummy_close(int fd)
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158 {
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159 struct _file *fp = dummy_fp(fd);
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160 if (!fp) return -1;
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161 if (fp->mode & O_WRONLY) {
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162 // Clean up - update file info for later
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163 fp->file->length = fp->pos - fp->file->data;
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164 }
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165 fp->flags = 0; // No longer open
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166 return 0;
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167 }
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168
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169 static int
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170 dummy_write(int fd, const void *buf, int len)
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171 {
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172 struct _file *fp = dummy_fp(fd);
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173 int res;
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174 if (!fp) return -1;
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175 res = fp->eof - fp->pos; // Space left in file
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176 if (res <= 0) return 0; // End of file
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177 if (res > len) res = len;
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178 bcopy(buf, fp->pos, res);
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179 fp->pos += res;
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180 return res;
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181 }
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182
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183 static int
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184 dummy_read(int fd, void *buf, int len)
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185 {
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186 struct _file *fp = dummy_fp(fd);
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187 int res;
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188 if (!fp) return -1;
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189 res = fp->eof - fp->pos; // Number of bytes left in "file"
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190 if (res > len) res = len;
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191 if (res <= 0) return 0; // End of file
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192 bcopy(fp->pos, buf, res);
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193 fp->pos += res;
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194 return res;
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195 }
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196
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197
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198 // EOF tftp_dummy_file.c