1 | /* Copyright 2009, UCAR/Unidata and OPeNDAP, Inc. |
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2 | See the COPYRIGHT file for more information. */ |
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3 | |
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4 | #include <stdlib.h> |
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5 | #include <stdio.h> |
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6 | #include <string.h> |
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7 | |
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8 | #include "ncbytes.h" |
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9 | |
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10 | #ifndef TRUE |
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11 | #define TRUE 1 |
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12 | #endif |
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13 | #ifndef FALSE |
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14 | #define FALSE 0 |
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15 | #endif |
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16 | |
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17 | #define DEFAULTALLOC 1024 |
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18 | #define ALLOCINCR 1024 |
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19 | |
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20 | static int ncbytesdebug = 1; |
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21 | |
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22 | static long |
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23 | ncbytesfail(void) |
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24 | { |
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25 | fflush(stdout); |
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26 | fprintf(stderr,"bytebuffer failure\n"); |
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27 | fflush(stderr); |
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28 | if(ncbytesdebug) abort(); |
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29 | return FALSE; |
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30 | } |
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31 | |
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32 | NCbytes* |
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33 | ncbytesnew(void) |
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34 | { |
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35 | NCbytes* bb = (NCbytes*)malloc(sizeof(NCbytes)); |
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36 | if(bb == NULL) return (NCbytes*)ncbytesfail(); |
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37 | bb->alloc=0; |
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38 | bb->length=0; |
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39 | bb->content=NULL; |
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40 | bb->nonextendible = 0; |
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41 | return bb; |
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42 | } |
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43 | |
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44 | int |
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45 | ncbytessetalloc(NCbytes* bb, unsigned int sz) |
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46 | { |
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47 | char* newcontent; |
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48 | if(bb == NULL) return ncbytesfail(); |
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49 | if(sz <= 0) {sz = (bb->alloc?2*bb->alloc:DEFAULTALLOC);} |
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50 | if(bb->alloc >= sz) return TRUE; |
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51 | if(bb->nonextendible) return ncbytesfail(); |
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52 | newcontent=(char*)calloc(sz,sizeof(char)); |
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53 | if(bb->alloc > 0 && bb->length > 0 && bb->content != NULL) { |
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54 | memcpy((void*)newcontent,(void*)bb->content,sizeof(char)*bb->length); |
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55 | } |
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56 | if(bb->content != NULL) free(bb->content); |
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57 | bb->content=newcontent; |
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58 | bb->alloc=sz; |
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59 | return TRUE; |
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60 | } |
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61 | |
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62 | void |
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63 | ncbytesfree(NCbytes* bb) |
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64 | { |
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65 | if(bb == NULL) return; |
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66 | if(!bb->nonextendible && bb->content != NULL) free(bb->content); |
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67 | free(bb); |
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68 | } |
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69 | |
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70 | int |
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71 | ncbytessetlength(NCbytes* bb, unsigned int sz) |
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72 | { |
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73 | if(bb == NULL) return ncbytesfail(); |
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74 | if(sz > bb->alloc) {if(!ncbytessetalloc(bb,sz)) return ncbytesfail();} |
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75 | bb->length = sz; |
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76 | return TRUE; |
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77 | } |
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78 | |
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79 | int |
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80 | ncbytesfill(NCbytes* bb, char fill) |
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81 | { |
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82 | unsigned int i; |
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83 | if(bb == NULL) return ncbytesfail(); |
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84 | for(i=0;i<bb->length;i++) bb->content[i] = fill; |
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85 | return TRUE; |
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86 | } |
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87 | |
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88 | int |
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89 | ncbytesget(NCbytes* bb, unsigned int index) |
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90 | { |
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91 | if(bb == NULL) return -1; |
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92 | if(index >= bb->length) return -1; |
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93 | return bb->content[index]; |
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94 | } |
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95 | |
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96 | int |
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97 | ncbytesset(NCbytes* bb, unsigned int index, char elem) |
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98 | { |
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99 | if(bb == NULL) return ncbytesfail(); |
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100 | if(index >= bb->length) return ncbytesfail(); |
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101 | bb->content[index] = elem; |
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102 | return TRUE; |
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103 | } |
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104 | |
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105 | int |
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106 | ncbytesappend(NCbytes* bb, char elem) |
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107 | { |
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108 | if(bb == NULL) return ncbytesfail(); |
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109 | if(bb->length >= bb->alloc) if(!ncbytessetalloc(bb,0)) return ncbytesfail(); |
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110 | bb->content[bb->length] = elem; |
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111 | bb->length++; |
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112 | return TRUE; |
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113 | } |
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114 | |
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115 | /* This assumes s is a null terminated string*/ |
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116 | int |
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117 | ncbytescat(NCbytes* bb, char* s) |
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118 | { |
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119 | ncbytesappendn(bb,(void*)s,strlen(s)+1); /* include trailing null*/ |
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120 | /* back up over the trailing null*/ |
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121 | if(bb->length == 0) return ncbytesfail(); |
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122 | bb->length--; |
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123 | return 1; |
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124 | } |
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125 | |
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126 | int |
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127 | ncbytesappendn(NCbytes* bb, void* elem, unsigned int n) |
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128 | { |
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129 | if(bb == NULL || elem == NULL) return ncbytesfail(); |
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130 | if(n == 0) {n = strlen((char*)elem);} |
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131 | while(!ncbytesavail(bb,n)) {if(!ncbytessetalloc(bb,0)) return ncbytesfail();} |
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132 | memcpy((void*)&bb->content[bb->length],(void*)elem,n); |
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133 | bb->length += n; |
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134 | return TRUE; |
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135 | } |
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136 | |
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137 | int |
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138 | ncbytesprepend(NCbytes* bb, char elem) |
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139 | { |
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140 | int i; /* do not make unsigned */ |
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141 | if(bb == NULL) return ncbytesfail(); |
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142 | if(bb->length >= bb->alloc) if(!ncbytessetalloc(bb,0)) return ncbytesfail(); |
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143 | /* could we trust memcpy? instead */ |
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144 | for(i=bb->alloc;i>=1;i--) {bb->content[i]=bb->content[i-1];} |
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145 | bb->content[0] = elem; |
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146 | bb->length++; |
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147 | return TRUE; |
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148 | } |
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149 | |
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150 | char* |
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151 | ncbytesdup(NCbytes* bb) |
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152 | { |
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153 | char* result = (char*)malloc(bb->length+1); |
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154 | memcpy((void*)result,(const void*)bb->content,bb->length); |
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155 | result[bb->length] = '\0'; /* just in case it is a string*/ |
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156 | return result; |
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157 | } |
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158 | |
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159 | char* |
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160 | ncbytesextract(NCbytes* bb) |
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161 | { |
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162 | char* result = bb->content; |
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163 | bb->alloc = 0; |
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164 | bb->length = 0; |
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165 | bb->content = NULL; |
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166 | return result; |
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167 | } |
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168 | |
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169 | int |
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170 | ncbytessetcontents(NCbytes* bb, char* contents, unsigned int alloc) |
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171 | { |
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172 | if(bb == NULL) return ncbytesfail(); |
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173 | ncbytesclear(bb); |
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174 | if(!bb->nonextendible && bb->content != NULL) free(bb->content); |
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175 | bb->content = contents; |
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176 | bb->length = 0; |
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177 | bb->alloc = alloc; |
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178 | bb->nonextendible = 1; |
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179 | return 1; |
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180 | } |
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181 | |
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182 | /* Null terminate the byte string without extending its length */ |
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183 | /* For debugging */ |
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184 | int |
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185 | ncbytesnull(NCbytes* bb) |
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186 | { |
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187 | ncbytesappend(bb,'\0'); |
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188 | bb->length--; |
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189 | return 1; |
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190 | } |
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191 | |
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