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annotate src/dmgrowbuf.c @ 1700:a2e65aa47554

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Implement dmGrowBufConstCopy() and dmGrowBufCreateFrom(), and also DMGrowBuf::is_const flag, that marks a buffer "unmodifiable", though obviously that is not strictly enforced.
author Matti Hamalainen <ccr@tnsp.org>
date Tue, 05 Jun 2018 15:04:15 +0300
parents f71cd6691e05
children 31a1f710e342
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 //#define DM_GROWBUF_DEBUG 1
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10
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11 #ifdef DM_GROWBUF_DEBUG
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12 # define DM_DBG(...) do { fprintf(stderr, __VA_ARGS__); } while (0)
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13 #else
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14 # define DM_DBG(...) do { } while (0)
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15 #endif
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16
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17
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18 int dmGrowBufInit(DMGrowBuf *buf)
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19 {
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20 DM_DBG("dmGrowBufInit(%p)\n", buf);
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21
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22 if (buf == NULL)
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23 return DMERR_NULLPTR;
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24
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25 memset(buf, 0, sizeof(DMGrowBuf));
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26
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27 return DMERR_OK;
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28 }
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29
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30
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31 int dmGrowBufAlloc(DMGrowBuf *buf, const size_t initial, const size_t mingrow)
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32 {
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33 int res;
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34
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35 DM_DBG("dmGrowBufAlloc(%p, %" DM_PRIu_SIZE_T ", %" DM_PRIu_SIZE_T ")\n",
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36 buf, initial, mingrow);
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37
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38 if ((res = dmGrowBufInit(buf)) != DMERR_OK)
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39 return res;
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40
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41 buf->len = 0;
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42 buf->offs = 0;
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43 buf->size = initial;
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44 buf->mingrow = mingrow;
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45 buf->allocated = FALSE;
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46
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47 // Allocate the data
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48 if ((buf->data = dmMalloc0(initial)) == NULL)
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49 return DMERR_MALLOC;
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50
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51 return DMERR_OK;
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52 }
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53
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54
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55 int dmGrowBufNew(DMGrowBuf **pbuf, const size_t initial, const size_t mingrow)
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56 {
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57 int res;
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58 if (pbuf == NULL)
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59 return DMERR_NULLPTR;
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60
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61 DM_DBG("dmGrowBufNew(%p, %" DM_PRIu_SIZE_T ", %" DM_PRIu_SIZE_T ")\n",
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62 pbuf, initial, mingrow);
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63
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64 if ((*pbuf = dmMalloc0(sizeof(DMGrowBuf))) == NULL)
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65 return DMERR_MALLOC;
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66
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67 if ((res = dmGrowBufAlloc(*pbuf, initial, mingrow)) != DMERR_OK)
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68 {
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69 // The "allocated" flag has not yet been set
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70 dmGrowBufFree(*pbuf);
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71
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72 // .. thus free the allocated struct here
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73 dmFreeR(pbuf);
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74 return res;
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75 }
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76
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77 (*pbuf)->allocated = TRUE;
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78 return res;
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79 }
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80
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81
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82 void dmGrowBufFree(DMGrowBuf *buf)
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83 {
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84 DM_DBG("dmGrowBufFree(%p)\n", buf);
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85 if (buf != NULL)
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86 {
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87 DM_DBG(
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88 " buf->data = %p\n"
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89 " buf->allocated = %s\n",
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90 " buf->is_const = %s\n",
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91 buf->data,
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92 buf->allocated ? "YES" : "NO",
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93 buf->is_const ? "YES" : "NO");
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94
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95 if (buf->is_const)
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96 return;
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97
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98 dmFreeR(&buf->data);
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99
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100 if (buf->allocated)
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101 dmFree(buf);
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102 }
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103 }
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104
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105
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106 DMGrowBuf * dmGrowBufConstCopy(DMGrowBuf *dst, const DMGrowBuf *src)
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107 {
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108 memcpy(dst, src, sizeof(DMGrowBuf));
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109 dst->is_const = TRUE;
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110 return dst;
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111 }
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112
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113
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114 DMGrowBuf * dmGrowBufCreateFrom(DMGrowBuf *dst, Uint8 *data, size_t len)
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115 {
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116 dmGrowBufInit(dst);
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117
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118 dst->data = data;
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119 dst->len = dst->size = len;
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120 dst->is_const = TRUE;
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121
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122 return dst;
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123 }
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124
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125
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126 static BOOL dmGrowBufRealloc(DMGrowBuf *buf, const size_t nsize, const BOOL clear)
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127 {
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128 DM_DBG("dmGrowBufRealloc(%p):\n"
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129 " size=%" DM_PRIu_SIZE_T ", nsize=" DM_PRIu_SIZE_T
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130 ", nstack=%d, offs=%" DM_PRIu_SIZE_T "\n",
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131 buf, buf->size, nsize, buf->nstack, buf->offs);
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132
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133 if (buf->is_const)
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134 return FALSE;
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135
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136 // Can't be smaller than current size!
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137 if (nsize < buf->size)
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138 return FALSE;
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139
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140 if ((buf->data = dmRealloc(buf->data, nsize)) == NULL)
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141 return FALSE;
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142
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143 // For buffers growing backwards, we must move the
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144 // current data to the end of the buffer ..
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145 size_t clrsize = nsize - buf->size;
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146 if (buf->backwards)
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147 {
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148 memmove(buf->data + clrsize, buf->data, clrsize);
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149 buf->offs += clrsize;
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150 }
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151
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152 // Check if we need to clear the newly allocated area?
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153 if (clear)
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154 {
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155 if (buf->backwards)
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156 memset(buf->data, 0, clrsize);
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157 else
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158 memset(buf->data + buf->size, 0, clrsize);
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159 }
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160
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161 buf->size = nsize;
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162
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163 return TRUE;
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164 }
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165
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166
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167 //
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168 // Grow the buffer by "amount" bytes, but at least by buf->mingrow,
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169 // if there is not enough space for at least that amount compared to
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170 // current buffer "len".
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171 //
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172 BOOL dmGrowBufGrow(DMGrowBuf *buf, const size_t amount)
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173 {
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174 size_t grow = (amount > buf->mingrow) ? amount : buf->mingrow;
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175
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176 if (buf->is_const)
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177 return FALSE;
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178
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179 if (buf->data == NULL ||
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180 (buf->backwards && amount >= buf->offs) ||
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181 (!buf->backwards && buf->offs + amount >= buf->size))
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182 {
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183 if (!dmGrowBufRealloc(buf, buf->size + grow, TRUE))
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184 return FALSE;
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185 }
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186
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187 buf->len += amount;
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188 return TRUE;
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189 }
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190
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191
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192 //
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193 // Grow the buffer if "nsize" is larger than the current buffer size.
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194 // Buffer is enlarged to nsize + mingrow.
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195 //
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196 BOOL dmGrowBufCheckGrow(DMGrowBuf *buf, const size_t nsize)
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197 {
1700
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diff changeset
198 if (buf->is_const)
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199 return FALSE;
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diff changeset
200
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201 if (buf->data == NULL || nsize > buf->size)
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202 {
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203 if (!dmGrowBufRealloc(buf, nsize + buf->mingrow, TRUE))
1455
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204 return FALSE;
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205 }
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diff changeset
206
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207 buf->len = nsize;
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208 return TRUE;
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diff changeset
209 }
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diff changeset
210
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diff changeset
211
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diff changeset
212 static void dmGrowBufUpdate(DMGrowBuf *buf)
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213 {
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214 if (buf->offs < buf->min_offs)
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215 buf->min_offs = buf->offs;
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diff changeset
216
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Matti Hamalainen <ccr@tnsp.org>
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diff changeset
217 if (buf->offs > buf->max_offs)
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218 buf->max_offs = buf->offs;
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diff changeset
219 }
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diff changeset
220
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
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diff changeset
221
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
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diff changeset
222 BOOL dmGrowBufPut(DMGrowBuf *buf, const Uint8 *data, const size_t len)
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diff changeset
223 {
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Matti Hamalainen <ccr@tnsp.org>
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diff changeset
224 if (data == NULL)
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Matti Hamalainen <ccr@tnsp.org>
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diff changeset
225 return FALSE;
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
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parents: 1694
diff changeset
226
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Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
227 if (!dmGrowBufGrow(buf, len))
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Matti Hamalainen <ccr@tnsp.org>
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diff changeset
228 return FALSE;
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
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parents: 1694
diff changeset
229
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
230 if (buf->backwards)
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
231 {
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
232 if (buf->literal)
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Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
233 {
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Matti Hamalainen <ccr@tnsp.org>
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diff changeset
234 buf->offs -= len;
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
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diff changeset
235 memcpy(buf->data + buf->offs, data, len);
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Matti Hamalainen <ccr@tnsp.org>
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diff changeset
236 }
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
237 else
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Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
238 {
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
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diff changeset
239 for (size_t n = 0; n < len; n++)
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Matti Hamalainen <ccr@tnsp.org>
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diff changeset
240 buf->data[buf->offs--] = data[n];
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diff changeset
241 }
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
242 }
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
243 else
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
244 {
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
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diff changeset
245 memcpy(buf->data + buf->offs, data, len);
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diff changeset
246 buf->offs += len;
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
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diff changeset
247 }
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
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diff changeset
248
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
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diff changeset
249 dmGrowBufUpdate(buf);
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
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diff changeset
250
1455
a957b318fbe2 Add dmGrowBufCheckGrow() function.
Matti Hamalainen <ccr@tnsp.org>
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diff changeset
251 return TRUE;
a957b318fbe2 Add dmGrowBufCheckGrow() function.
Matti Hamalainen <ccr@tnsp.org>
parents: 1454
diff changeset
252 }
a957b318fbe2 Add dmGrowBufCheckGrow() function.
Matti Hamalainen <ccr@tnsp.org>
parents: 1454
diff changeset
253
a957b318fbe2 Add dmGrowBufCheckGrow() function.
Matti Hamalainen <ccr@tnsp.org>
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diff changeset
254
1454
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Matti Hamalainen <ccr@tnsp.org>
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diff changeset
255 BOOL dmGrowBufPutU8(DMGrowBuf *buf, const Uint8 value)
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
256 {
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Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
257 if (!dmGrowBufGrow(buf, sizeof(Uint8)))
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Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
258 return FALSE;
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parents:
diff changeset
259
1697
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diff changeset
260 buf->data[buf->offs] = value;
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
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diff changeset
261 if (buf->backwards)
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
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diff changeset
262 buf->offs--;
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
parents: 1694
diff changeset
263 else
1036b0dcccb5 Refactor DMGrowBuf so that there can be buffers that grow "backwards".
Matti Hamalainen <ccr@tnsp.org>
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diff changeset
264 buf->offs++;
1454
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Matti Hamalainen <ccr@tnsp.org>
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diff changeset
265
1697
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diff changeset
266 dmGrowBufUpdate(buf);
1454
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parents:
diff changeset
267
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parents:
diff changeset
268 return TRUE;
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
269 }
fff3b58d031c Add a growable buffer implementation.
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parents:
diff changeset
270
fff3b58d031c Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
271
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272 BOOL dmGrowBufPutU16BE(DMGrowBuf *buf, const Uint16 val)
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273 {
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274 if (buf->literal && buf->backwards)
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275 {
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276 return
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277 !dmGrowBufPutU8(buf, val & 0xff) ||
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278 !dmGrowBufPutU8(buf, (val >> 8) & 0xff);
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279 }
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280 else
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281 {
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282 return
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283 !dmGrowBufPutU8(buf, (val >> 8) & 0xff) ||
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284 !dmGrowBufPutU8(buf, val & 0xff);
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285 }
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286 }
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287
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288
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289 BOOL dmGrowBufPutU16LE(DMGrowBuf *buf, const Uint16 val)
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290 {
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291 if (buf->literal && buf->backwards)
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292 {
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293 return
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294 !dmGrowBufPutU8(buf, (val >> 8) & 0xff) ||
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295 !dmGrowBufPutU8(buf, val & 0xff);
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296 }
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297 else
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298 {
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299 return
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300 !dmGrowBufPutU8(buf, val & 0xff) ||
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301 !dmGrowBufPutU8(buf, (val >> 8) & 0xff);
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302 }
1454
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303 }
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304
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305
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306 BOOL dmGrowBufPutU32BE(DMGrowBuf *buf, const Uint32 val)
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307 {
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308 if (buf->literal && buf->backwards)
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309 {
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310 return
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311 !dmGrowBufPutU8(buf, (val >> 24) & 0xff) ||
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312 !dmGrowBufPutU8(buf, (val >> 16) & 0xff) ||
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313 !dmGrowBufPutU8(buf, (val >> 8) & 0xff) ||
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314 !dmGrowBufPutU8(buf, val & 0xff);
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315 }
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316 else
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317 {
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318 return
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319 !dmGrowBufPutU8(buf, val & 0xff) ||
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320 !dmGrowBufPutU8(buf, (val >> 8) & 0xff) ||
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321 !dmGrowBufPutU8(buf, (val >> 16) & 0xff) ||
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322 !dmGrowBufPutU8(buf, (val >> 24) & 0xff);
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323 }
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324 }
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325
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326
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327 BOOL dmGrowBufPutU32LE(DMGrowBuf *buf, const Uint32 val)
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328 {
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329 if (buf->literal && buf->backwards)
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330 {
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331 return
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332 !dmGrowBufPutU8(buf, val & 0xff) ||
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333 !dmGrowBufPutU8(buf, (val >> 8) & 0xff) ||
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334 !dmGrowBufPutU8(buf, (val >> 16) & 0xff) ||
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335 !dmGrowBufPutU8(buf, (val >> 24) & 0xff);
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336 }
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337 else
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338 {
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339 return
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340 !dmGrowBufPutU8(buf, (val >> 24) & 0xff) ||
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341 !dmGrowBufPutU8(buf, (val >> 16) & 0xff) ||
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342 !dmGrowBufPutU8(buf, (val >> 8) & 0xff) ||
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343 !dmGrowBufPutU8(buf, val & 0xff);
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344 }
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345 }
1699
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346
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347
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348 BOOL dmGrowBufGetU8(DMGrowBuf *buf, Uint8 *value)
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349 {
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350 if (buf->backwards && buf->offs > 0)
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351 {
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352 *value = buf->data[buf->offs];
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353 buf->offs--;
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354 return TRUE;
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355 }
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356 else
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357 if (!buf->backwards && buf->offs < buf->len)
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358 {
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359 *value = buf->data[buf->offs];
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360 buf->offs++;
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361 return TRUE;
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362 }
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363
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364 return FALSE;
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365 }