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1 | /* |
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2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. |
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3 | * |
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4 | * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved. |
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5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions are met: |
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8 | * |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * |
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12 | * 2. Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * |
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16 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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17 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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20 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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26 | * POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |
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29 | #include "cx/buffer.h" |
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30 | #include "cx/utils.h" |
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31 | |
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32 | #include <stdlib.h> |
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33 | #include <string.h> |
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34 | |
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35 | int cxBufferInit( |
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36 | CxBuffer *buffer, |
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37 | void *space, |
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38 | size_t capacity, |
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39 | CxAllocator *allocator, |
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40 | int flags |
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41 | ) { |
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42 | buffer->allocator = allocator; |
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43 | buffer->flags = flags; |
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44 | if (!space) { |
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45 | buffer->bytes = cxMalloc(allocator, capacity); |
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46 | if (buffer->bytes == NULL) { |
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47 | return 1; |
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48 | } |
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49 | memset(buffer->bytes, 0, capacity); |
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50 | buffer->flags |= CX_BUFFER_FREE_CONTENTS; |
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51 | } else { |
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52 | buffer->bytes = space; |
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53 | } |
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54 | buffer->capacity = capacity; |
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55 | buffer->size = 0; |
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56 | |
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57 | buffer->pos = 0; |
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58 | |
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59 | return 0; |
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60 | } |
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61 | |
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62 | void cxBufferDestroy(CxBuffer *buffer) { |
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63 | if ((buffer->flags & CX_BUFFER_FREE_CONTENTS) == CX_BUFFER_FREE_CONTENTS) { |
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64 | cxFree(buffer->allocator, buffer->bytes); |
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65 | } |
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66 | } |
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67 | |
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68 | CxBuffer *cxBufferExtract( |
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69 | CxBuffer *src, |
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70 | size_t start, |
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71 | size_t length, |
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72 | int flags |
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73 | ) { |
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74 | if (src->size == 0 || length == 0 || |
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75 | ((size_t) -1) - start < length || start + length > src->capacity) { |
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76 | return NULL; |
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77 | } |
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78 | |
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79 | CxBuffer *dst = (CxBuffer *) malloc(sizeof(cx_buffer_s)); |
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80 | if (dst) { |
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81 | dst->bytes = malloc(length); |
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82 | if (!dst->bytes) { |
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83 | free(dst); |
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84 | return NULL; |
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85 | } |
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86 | dst->capacity = length; |
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87 | dst->size = length; |
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88 | dst->flags = flags | CX_BUFFER_FREE_CONTENTS; |
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89 | dst->pos = 0; |
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90 | memcpy(dst->bytes, src->bytes + start, length); |
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91 | } |
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92 | return dst; |
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93 | } |
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94 | |
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95 | int cxBufferSeek( |
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96 | CxBuffer *buffer, |
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97 | off_t offset, |
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98 | int whence |
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99 | ) { |
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100 | size_t npos; |
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101 | switch (whence) { |
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102 | case SEEK_CUR: |
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103 | npos = buffer->pos; |
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104 | break; |
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105 | case SEEK_END: |
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106 | npos = buffer->size; |
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107 | break; |
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108 | case SEEK_SET: |
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109 | npos = 0; |
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110 | break; |
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111 | default: |
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112 | return -1; |
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113 | } |
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114 | |
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115 | size_t opos = npos; |
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116 | npos += offset; |
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117 | |
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118 | if ((offset > 0 && npos < opos) || (offset < 0 && npos > opos)) { |
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119 | return -1; |
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120 | } |
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121 | |
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122 | if (npos >= buffer->size) { |
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123 | return -1; |
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124 | } else { |
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125 | buffer->pos = npos; |
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126 | return 0; |
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127 | } |
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128 | |
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129 | } |
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130 | |
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131 | int cxBufferEof(CxBuffer *buffer) { |
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132 | return buffer->pos >= buffer->size; |
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133 | } |
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134 | |
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135 | int cxBufferMinimumCapacity( |
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136 | CxBuffer *buffer, |
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137 | size_t additional_bytes |
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138 | ) { |
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139 | size_t newcap = buffer->capacity + additional_bytes; |
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140 | |
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141 | // overflow protection |
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142 | if (newcap < buffer->capacity) { |
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143 | return -1; |
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144 | } |
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145 | |
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146 | unsigned char *newspace = realloc(buffer->bytes, newcap); |
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147 | if (newspace) { |
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148 | memset(newspace + buffer->size, 0, newcap - buffer->size); |
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149 | buffer->bytes = newspace; |
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150 | buffer->capacity = newcap; |
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151 | } else { |
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152 | return -1; |
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153 | } |
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154 | |
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155 | return 0; |
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156 | } |
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157 | |
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158 | size_t cxBufferWrite( |
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159 | void const *ptr, |
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160 | size_t size, |
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161 | size_t nitems, |
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162 | CxBuffer *buffer |
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163 | ) { |
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164 | size_t len; |
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165 | if (cx_szmul(size, nitems, &len)) { |
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166 | return 0; |
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167 | } |
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168 | size_t required = buffer->pos + len; |
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169 | if (buffer->pos > required) { |
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170 | return 0; |
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171 | } |
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172 | |
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173 | if (required > buffer->capacity) { |
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174 | if ((buffer->flags & CX_BUFFER_AUTO_EXTEND) == CX_BUFFER_AUTO_EXTEND) { |
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175 | if (cxBufferMinimumCapacity(buffer, required)) { |
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176 | return 0; |
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177 | } |
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178 | } else { |
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179 | len = buffer->capacity - buffer->pos; |
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180 | if (size > 1) { |
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181 | len -= len % size; |
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182 | } |
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183 | } |
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184 | } |
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185 | |
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186 | if (len == 0) { |
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187 | return len; |
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188 | } |
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189 | |
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190 | memcpy(buffer->bytes + buffer->pos, ptr, len); |
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191 | buffer->pos += len; |
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192 | if (buffer->pos > buffer->size) { |
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193 | buffer->size = buffer->pos; |
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194 | } |
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195 | |
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196 | return len / size; |
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197 | } |
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198 | |
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199 | size_t cxBufferRead( |
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200 | void *ptr, |
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201 | size_t size, |
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202 | size_t nitems, |
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203 | CxBuffer *buffer |
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204 | ) { |
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205 | size_t len; |
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206 | if (cx_szmul(size, nitems, &len)) { |
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207 | return 0; |
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208 | } |
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209 | if (buffer->pos + len > buffer->size) { |
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210 | len = buffer->size - buffer->pos; |
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211 | if (size > 1) len -= len % size; |
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212 | } |
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213 | |
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214 | if (len <= 0) { |
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215 | return len; |
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216 | } |
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217 | |
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218 | memcpy(ptr, buffer->bytes + buffer->pos, len); |
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219 | buffer->pos += len; |
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220 | |
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221 | return len / size; |
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222 | } |
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223 | |
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224 | int cxBufferPut( |
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225 | CxBuffer *buffer, |
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226 | int c |
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227 | ) { |
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228 | if (buffer->pos >= buffer->capacity) { |
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229 | if ((buffer->flags & CX_BUFFER_AUTO_EXTEND) == CX_BUFFER_AUTO_EXTEND) { |
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230 | if (cxBufferMinimumCapacity(buffer, buffer->capacity + 1)) { |
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231 | return EOF; |
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232 | } |
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233 | } else { |
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234 | return EOF; |
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235 | } |
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236 | } |
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237 | |
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238 | c &= 0xFF; |
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239 | buffer->bytes[buffer->pos] = (unsigned char) c; |
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240 | buffer->pos++; |
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241 | if (buffer->pos > buffer->size) { |
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242 | buffer->size = buffer->pos; |
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243 | } |
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244 | return c; |
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245 | } |
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246 | |
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247 | int cxBufferGet(CxBuffer *buffer) { |
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248 | if (cxBufferEof(buffer)) { |
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249 | return EOF; |
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250 | } else { |
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251 | int c = buffer->bytes[buffer->pos]; |
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252 | buffer->pos++; |
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253 | return c; |
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254 | } |
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255 | } |
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256 | |
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257 | size_t cxBufferPutString( |
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258 | CxBuffer *buffer, |
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259 | const char *str |
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260 | ) { |
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261 | return cxBufferWrite(str, 1, strlen(str), buffer); |
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262 | } |
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263 | |
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264 | int cxBufferShiftLeft( |
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265 | CxBuffer *buffer, |
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266 | size_t shift |
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267 | ) { |
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268 | if (shift >= buffer->size) { |
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269 | buffer->pos = buffer->size = 0; |
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270 | } else { |
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271 | memmove(buffer->bytes, buffer->bytes + shift, buffer->size - shift); |
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272 | buffer->size -= shift; |
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273 | |
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274 | if (buffer->pos >= shift) { |
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275 | buffer->pos -= shift; |
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276 | } else { |
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277 | buffer->pos = 0; |
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278 | } |
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279 | } |
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280 | return 0; |
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281 | } |
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282 | |
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283 | int cxBufferShiftRight( |
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284 | CxBuffer *buffer, |
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285 | size_t shift |
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286 | ) { |
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287 | size_t req_capacity = buffer->size + shift; |
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288 | size_t movebytes; |
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289 | |
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290 | // auto extend buffer, if required and enabled |
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291 | if (buffer->capacity < req_capacity) { |
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292 | if ((buffer->flags & CX_BUFFER_AUTO_EXTEND) == CX_BUFFER_AUTO_EXTEND) { |
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293 | if (cxBufferMinimumCapacity(buffer, req_capacity)) { |
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294 | return 1; |
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295 | } |
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296 | movebytes = buffer->size; |
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297 | } else { |
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298 | movebytes = buffer->capacity - shift; |
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299 | } |
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300 | } else { |
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301 | movebytes = buffer->size; |
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302 | } |
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303 | |
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304 | memmove(buffer->bytes + shift, buffer->bytes, movebytes); |
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305 | buffer->size = shift + movebytes; |
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306 | |
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307 | buffer->pos += shift; |
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308 | if (buffer->pos > buffer->size) { |
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309 | buffer->pos = buffer->size; |
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310 | } |
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311 | |
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312 | return 0; |
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313 | } |
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314 | |
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315 | int cxBufferShift( |
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316 | CxBuffer *buffer, |
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317 | off_t shift |
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318 | ) { |
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319 | if (shift < 0) { |
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320 | return cxBufferShiftLeft(buffer, (size_t) (-shift)); |
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321 | } else if (shift > 0) { |
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322 | return cxBufferShiftRight(buffer, (size_t) shift); |
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323 | } else { |
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324 | return 0; |
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325 | } |
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326 | } |