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annotate src/dmgrowbuf.c @ 1454:fff3b58d031c

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Add a growable buffer implementation.
author Matti Hamalainen <ccr@tnsp.org>
date Thu, 10 May 2018 18:33:57 +0300
parents
children a957b318fbe2
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1454
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1 /*
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2 * DMLib
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3 * -- Growable buffer implementation
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4 * Programmed and designed by Matti 'ccr' Hamalainen
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5 * (C) Copyright 2018 Tecnic Software productions (TNSP)
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6 */
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7 #include "dmgrowbuf.h"
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8
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9
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10 int dmGrowBufInit(DMGrowBuf *buf, const size_t initial, const size_t mingrow)
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11 {
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12 if (buf == NULL)
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13 return DMERR_NULLPTR;
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14
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15 buf->len = 0;
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16 buf->size = initial;
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17 buf->mingrow = mingrow;
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18 buf->allocated = FALSE;
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19
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20 if ((buf->data = dmMalloc(initial)) == NULL)
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21 return DMERR_MALLOC;
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22
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23 return DMERR_OK;
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24 }
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25
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26
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27 int dmGrowBufAlloc(DMGrowBuf **pbuf, const size_t initial, const size_t mingrow)
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28 {
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29 int res;
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30
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31 if ((*pbuf = dmMalloc0(sizeof(DMGrowBuf))) == NULL)
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32 return DMERR_MALLOC;
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33
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34 if ((res = dmGrowBufInit(*pbuf, initial, mingrow)) != DMERR_OK)
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35 {
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36 dmGrowBufFree(*pbuf);
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37 return res;
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38 }
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39
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40 (*pbuf)->allocated = TRUE;
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41 return res;
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42 }
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43
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44
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45 void dmGrowBufFree(DMGrowBuf *buf)
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46 {
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47 if (buf != NULL)
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48 {
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49 dmFreeR(&buf->data);
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50 if (buf->allocated)
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51 dmFree(buf);
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52 }
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53 }
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54
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55
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56 BOOL dmGrowBufGrow(DMGrowBuf *buf, const size_t amount)
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57 {
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58 if (buf->data == NULL || buf->len + amount > buf->size)
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59 {
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60 buf->size += amount + (buf->mingrow > 0 ? buf->mingrow : 1024);
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61 if ((buf->data = dmRealloc(buf->data, buf->size)) == NULL)
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62 return FALSE;
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63 }
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64
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65 return TRUE;
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66 }
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67
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68
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69 int dmGrowBufResize(DMGrowBuf *buf)
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70 {
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71 if (buf == NULL)
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72 return DMERR_NULLPTR;
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73
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74 buf->size = buf->len;
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75 if (buf->len == 0)
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76 return DMERR_OK;
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77
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78 if ((buf->data = dmRealloc(buf->data, buf->len)) == NULL)
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79 return DMERR_MALLOC;
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80
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81 return DMERR_OK;
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82 }
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83
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84
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85 BOOL dmGrowBufPutU8(DMGrowBuf *buf, const Uint8 value)
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86 {
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87 if (!dmGrowBufGrow(buf, sizeof(Uint8)))
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88 return FALSE;
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89
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90 buf->data[buf->len++] = value;
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91
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92 return TRUE;
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93 }
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94
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95
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96 BOOL dmGrowBufPutStr(DMGrowBuf *buf, const void *str, const size_t len)
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97 {
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98 if (str == NULL)
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99 return FALSE;
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100
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101 if (!dmGrowBufGrow(buf, len + 1))
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102 return FALSE;
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103
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104 memcpy(buf->data + buf->len, str, len + 1);
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105 buf->len += len;
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106
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107 return TRUE;
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108 }
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109
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110
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111 BOOL dmGrowBufPutU16BE(DMGrowBuf *buf, const Uint16 val)
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112 {
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113 if (!dmGrowBufGrow(buf, sizeof(Uint16)))
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114 return FALSE;
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115
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116 buf->data[buf->len++] = (val >> 8) & 0xff;
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117 buf->data[buf->len++] = val & 0xff;
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118
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119 return TRUE;
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120 }
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121
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122
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123 BOOL dmGrowBufPutU16LE(DMGrowBuf *buf, const Uint16 val)
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124 {
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125 if (!dmGrowBufGrow(buf, sizeof(Uint16)))
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126 return FALSE;
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127
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128 buf->data[buf->len++] = val & 0xff;
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129 buf->data[buf->len++] = (val >> 8) & 0xff;
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130
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131 return TRUE;
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132 }
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133
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134
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135 BOOL dmGrowBufPutU32BE(DMGrowBuf *buf, const Uint32 val)
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136 {
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137 if (!dmGrowBufGrow(buf, sizeof(Uint32)))
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138 return FALSE;
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139
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140 buf->data[buf->len++] = (val >> 24) & 0xff;
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141 buf->data[buf->len++] = (val >> 16) & 0xff;
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142 buf->data[buf->len++] = (val >> 8) & 0xff;
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143 buf->data[buf->len++] = val & 0xff;
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144
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145 return TRUE;
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146 }
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147
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148
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149 BOOL dmGrowBufPutU32LE(DMGrowBuf *buf, const Uint32 val)
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150 {
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151 if (!dmGrowBufGrow(buf, sizeof(Uint32)))
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152 return FALSE;
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153
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154 buf->data[buf->len++] = val & 0xff;
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155 buf->data[buf->len++] = (val >> 8) & 0xff;
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156 buf->data[buf->len++] = (val >> 16) & 0xff;
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157 buf->data[buf->len++] = (val >> 24) & 0xff;
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158
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159 return TRUE;
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parents:
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160 }