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add missing documentation for cx_list_default_swap() return value
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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 | |
530 | 32 | #include <stdio.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 const *allocator, |
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40 | int flags |
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41 | ) { |
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42 | if (allocator == NULL) allocator = cxDefaultAllocator; |
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43 | buffer->allocator = allocator; |
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44 | buffer->flags = flags; |
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45 | if (!space) { |
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46 | buffer->bytes = cxMalloc(allocator, capacity); |
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47 | if (buffer->bytes == NULL) { |
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48 | return 1; |
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49 | } |
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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 | buffer->pos = 0; |
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57 | |
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58 | buffer->flush_func = NULL; |
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59 | buffer->flush_target = NULL; |
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60 | buffer->flush_blkmax = 0; |
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61 | buffer->flush_blksize = 4096; |
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62 | buffer->flush_threshold = SIZE_MAX; |
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63 | |
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64 | return 0; |
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65 | } |
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66 | |
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67 | void cxBufferDestroy(CxBuffer *buffer) { |
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68 | if ((buffer->flags & CX_BUFFER_FREE_CONTENTS) == CX_BUFFER_FREE_CONTENTS) { |
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69 | cxFree(buffer->allocator, buffer->bytes); |
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70 | } |
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71 | } |
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72 | |
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73 | CxBuffer *cxBufferCreate( |
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74 | void *space, |
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75 | size_t capacity, |
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76 | CxAllocator const *allocator, |
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77 | int flags |
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78 | ) { |
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79 | CxBuffer *buf = cxMalloc(allocator, sizeof(CxBuffer)); |
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80 | if (buf == NULL) return NULL; |
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81 | if (0 == cxBufferInit(buf, space, capacity, allocator, flags)) { |
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82 | return buf; |
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83 | } else { |
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84 | cxFree(allocator, buf); |
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85 | return NULL; |
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86 | } |
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87 | } |
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88 | |
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89 | void cxBufferFree(CxBuffer *buffer) { |
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90 | if ((buffer->flags & CX_BUFFER_FREE_CONTENTS) == CX_BUFFER_FREE_CONTENTS) { |
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91 | cxFree(buffer->allocator, buffer->bytes); |
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92 | } |
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93 | cxFree(buffer->allocator, buffer); |
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94 | } |
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95 | |
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96 | int cxBufferSeek( |
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97 | CxBuffer *buffer, |
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98 | off_t offset, |
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99 | int whence |
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100 | ) { |
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101 | size_t npos; |
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102 | switch (whence) { |
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103 | case SEEK_CUR: |
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104 | npos = buffer->pos; |
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105 | break; |
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106 | case SEEK_END: |
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107 | npos = buffer->size; |
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108 | break; |
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109 | case SEEK_SET: |
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110 | npos = 0; |
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111 | break; |
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112 | default: |
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113 | return -1; |
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114 | } |
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115 | |
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116 | size_t opos = npos; |
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117 | npos += offset; |
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118 | |
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119 | if ((offset > 0 && npos < opos) || (offset < 0 && npos > opos)) { |
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120 | return -1; |
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121 | } |
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122 | |
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123 | if (npos >= buffer->size) { |
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124 | return -1; |
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125 | } else { |
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126 | buffer->pos = npos; |
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127 | return 0; |
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128 | } |
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129 | |
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130 | } |
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131 | |
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132 | void cxBufferClear(CxBuffer *buffer) { |
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133 | memset(buffer->bytes, 0, buffer->size); |
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134 | buffer->size = 0; |
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135 | buffer->pos = 0; |
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136 | } |
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137 | |
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138 | void cxBufferReset(CxBuffer *buffer) { |
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139 | buffer->size = 0; |
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140 | buffer->pos = 0; |
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141 | } |
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142 | |
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143 | int cxBufferEof(CxBuffer const *buffer) { |
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144 | return buffer->pos >= buffer->size; |
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145 | } |
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146 | |
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147 | int cxBufferMinimumCapacity( |
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148 | CxBuffer *buffer, |
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149 | size_t newcap |
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150 | ) { |
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151 | if (newcap <= buffer->capacity) { |
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152 | return 0; |
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153 | } |
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154 | |
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155 | if (cxReallocate(buffer->allocator, |
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156 | (void **) &buffer->bytes, newcap) == 0) { |
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157 | buffer->capacity = newcap; |
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158 | return 0; |
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159 | } else { |
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160 | return -1; |
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161 | } |
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162 | } |
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163 | |
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164 | /** |
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165 | * Helps flushing data to the flush target of a buffer. |
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166 | * |
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167 | * @param buffer the buffer containing the config |
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168 | * @param space the data to flush |
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169 | * @param size the element size |
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170 | * @param nitems the number of items |
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171 | * @return the number of items flushed |
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172 | */ |
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173 | static size_t cx_buffer_write_flush_helper( |
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174 | CxBuffer *buffer, |
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175 | unsigned char const *space, |
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176 | size_t size, |
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177 | size_t nitems |
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178 | ) { |
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179 | size_t pos = 0; |
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180 | size_t remaining = nitems; |
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181 | size_t max_items = buffer->flush_blksize / size; |
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182 | while (remaining > 0) { |
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183 | size_t items = remaining > max_items ? max_items : remaining; |
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184 | size_t flushed = buffer->flush_func( |
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185 | space + pos, |
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186 | size, items, |
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187 | buffer->flush_target); |
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188 | if (flushed > 0) { |
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189 | pos += (flushed * size); |
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190 | remaining -= flushed; |
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191 | } else { |
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192 | // if no bytes can be flushed out anymore, we give up |
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193 | break; |
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194 | } |
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195 | } |
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196 | return nitems - remaining; |
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197 | } |
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198 | |
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199 | size_t cxBufferWrite( |
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200 | void const *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 | // optimize for easy case |
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206 | if (size == 1 && (buffer->capacity - buffer->pos) >= nitems) { |
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207 | memcpy(buffer->bytes + buffer->pos, ptr, nitems); |
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208 | buffer->pos += nitems; |
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209 | if (buffer->pos > buffer->size) { |
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210 | buffer->size = buffer->pos; |
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211 | } |
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212 | return nitems; |
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213 | } |
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214 | |
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215 | size_t len; |
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216 | size_t nitems_out = nitems; |
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217 | if (cx_szmul(size, nitems, &len)) { |
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218 | return 0; |
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219 | } |
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220 | size_t required = buffer->pos + len; |
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221 | if (buffer->pos > required) { |
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222 | return 0; |
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223 | } |
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224 | |
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225 | bool perform_flush = false; |
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226 | if (required > buffer->capacity) { |
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227 | if ((buffer->flags & CX_BUFFER_AUTO_EXTEND) == CX_BUFFER_AUTO_EXTEND && required) { |
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228 | if (buffer->flush_blkmax > 0 && required > buffer->flush_threshold) { |
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229 | perform_flush = true; |
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230 | } else { |
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231 | if (cxBufferMinimumCapacity(buffer, required)) { |
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232 | return 0; |
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233 | } |
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234 | } |
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235 | } else { |
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236 | if (buffer->flush_blkmax > 0) { |
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237 | perform_flush = true; |
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238 | } else { |
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239 | // truncate data to be written, if we can neither extend nor flush |
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240 | len = buffer->capacity - buffer->pos; |
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241 | if (size > 1) { |
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242 | len -= len % size; |
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243 | } |
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244 | nitems_out = len / size; |
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245 | } |
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246 | } |
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247 | } |
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248 | |
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249 | if (len == 0) { |
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250 | return len; |
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251 | } |
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252 | |
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253 | if (perform_flush) { |
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254 | size_t flush_max; |
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255 | if (cx_szmul(buffer->flush_blkmax, buffer->flush_blksize, &flush_max)) { |
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256 | return 0; |
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257 | } |
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258 | size_t flush_pos = buffer->flush_func == NULL || buffer->flush_target == NULL |
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259 | ? buffer->pos |
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260 | : cx_buffer_write_flush_helper(buffer, buffer->bytes, 1, buffer->pos); |
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261 | if (flush_pos == buffer->pos) { |
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262 | // entire buffer has been flushed, we can reset |
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263 | buffer->size = buffer->pos = 0; |
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264 | |
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265 | size_t items_flush; // how many items can also be directly flushed |
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266 | size_t items_keep; // how many items have to be written to the buffer |
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267 | |
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268 | items_flush = flush_max >= required ? nitems : (flush_max - flush_pos) / size; |
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269 | if (items_flush > 0) { |
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270 | items_flush = cx_buffer_write_flush_helper(buffer, ptr, size, items_flush / size); |
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271 | // in case we could not flush everything, keep the rest |
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272 | } |
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273 | items_keep = nitems - items_flush; |
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274 | if (items_keep > 0) { |
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275 | // try again with the remaining stuff |
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276 | unsigned char const *new_ptr = ptr; |
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277 | new_ptr += items_flush * size; |
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278 | // report the directly flushed items as written plus the remaining stuff |
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279 | return items_flush + cxBufferWrite(new_ptr, size, items_keep, buffer); |
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280 | } else { |
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281 | // all items have been flushed - report them as written |
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282 | return nitems; |
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283 | } |
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284 | } else if (flush_pos == 0) { |
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285 | // nothing could be flushed at all, we immediately give up without writing any data |
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286 | return 0; |
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287 | } else { |
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288 | // we were partially successful, we shift left and try again |
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289 | cxBufferShiftLeft(buffer, flush_pos); |
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290 | return cxBufferWrite(ptr, size, nitems, buffer); |
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291 | } |
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292 | } else { |
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293 | memcpy(buffer->bytes + buffer->pos, ptr, len); |
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294 | buffer->pos += len; |
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295 | if (buffer->pos > buffer->size) { |
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296 | buffer->size = buffer->pos; |
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297 | } |
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298 | return nitems_out; |
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299 | } |
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300 | |
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301 | } |
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302 | |
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303 | int cxBufferPut( |
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304 | CxBuffer *buffer, |
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305 | int c |
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306 | ) { |
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307 | c &= 0xFF; |
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308 | unsigned char const ch = c; |
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309 | if (cxBufferWrite(&ch, 1, 1, buffer) == 1) { |
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310 | return c; |
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311 | } else { |
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312 | return EOF; |
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313 | } |
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314 | } |
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315 | |
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316 | size_t cxBufferPutString( |
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317 | CxBuffer *buffer, |
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318 | const char *str |
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319 | ) { |
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320 | return cxBufferWrite(str, 1, strlen(str), buffer); |
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321 | } |
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322 | |
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323 | size_t cxBufferRead( |
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324 | void *ptr, |
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325 | size_t size, |
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326 | size_t nitems, |
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327 | CxBuffer *buffer |
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328 | ) { |
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329 | size_t len; |
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330 | if (cx_szmul(size, nitems, &len)) { |
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331 | return 0; |
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332 | } |
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333 | if (buffer->pos + len > buffer->size) { |
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334 | len = buffer->size - buffer->pos; |
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335 | if (size > 1) len -= len % size; |
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336 | } |
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337 | |
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338 | if (len <= 0) { |
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339 | return len; |
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340 | } |
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341 | |
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342 | memcpy(ptr, buffer->bytes + buffer->pos, len); |
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343 | buffer->pos += len; |
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344 | |
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345 | return len / size; |
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346 | } |
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347 | |
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348 | int cxBufferGet(CxBuffer *buffer) { |
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349 | if (cxBufferEof(buffer)) { |
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350 | return EOF; |
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351 | } else { |
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352 | int c = buffer->bytes[buffer->pos]; |
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353 | buffer->pos++; |
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354 | return c; |
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355 | } |
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356 | } |
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357 | |
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358 | int cxBufferShiftLeft( |
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359 | CxBuffer *buffer, |
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360 | size_t shift |
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361 | ) { |
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362 | if (shift >= buffer->size) { |
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363 | buffer->pos = buffer->size = 0; |
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364 | } else { |
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365 | memmove(buffer->bytes, buffer->bytes + shift, buffer->size - shift); |
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366 | buffer->size -= shift; |
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367 | |
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368 | if (buffer->pos >= shift) { |
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369 | buffer->pos -= shift; |
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370 | } else { |
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371 | buffer->pos = 0; |
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372 | } |
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373 | } |
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374 | return 0; |
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375 | } |
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376 | |
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377 | int cxBufferShiftRight( |
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378 | CxBuffer *buffer, |
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379 | size_t shift |
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380 | ) { |
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381 | size_t req_capacity = buffer->size + shift; |
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382 | size_t movebytes; |
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383 | |
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384 | // auto extend buffer, if required and enabled |
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385 | if (buffer->capacity < req_capacity) { |
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386 | if ((buffer->flags & CX_BUFFER_AUTO_EXTEND) == CX_BUFFER_AUTO_EXTEND) { |
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387 | if (cxBufferMinimumCapacity(buffer, req_capacity)) { |
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388 | return 1; |
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389 | } |
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390 | movebytes = buffer->size; |
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391 | } else { |
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392 | movebytes = buffer->capacity - shift; |
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393 | } |
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394 | } else { |
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395 | movebytes = buffer->size; |
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396 | } |
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397 | |
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398 | memmove(buffer->bytes + shift, buffer->bytes, movebytes); |
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399 | buffer->size = shift + movebytes; |
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400 | |
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401 | buffer->pos += shift; |
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402 | if (buffer->pos > buffer->size) { |
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403 | buffer->pos = buffer->size; |
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404 | } |
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405 | |
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406 | return 0; |
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407 | } |
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408 | |
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409 | int cxBufferShift( |
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410 | CxBuffer *buffer, |
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411 | off_t shift |
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412 | ) { |
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413 | if (shift < 0) { |
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414 | return cxBufferShiftLeft(buffer, (size_t) (-shift)); |
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415 | } else if (shift > 0) { |
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416 | return cxBufferShiftRight(buffer, (size_t) shift); |
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417 | } else { |
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418 | return 0; |
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419 | } |
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420 | } |