src/buffer.c

Sun, 29 Sep 2024 13:32:33 +0200

author
Mike Becker <universe@uap-core.de>
date
Sun, 29 Sep 2024 13:32:33 +0200
changeset 893
0a2b328f5b91
parent 890
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child 970
c9b02747cfc5
permissions
-rw-r--r--

add bounding parameter to cx_tree_add_iter()

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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 <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 const CxAllocator *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 const CxAllocator *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(const CxBuffer *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
544
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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 const unsigned char *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 const 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 // 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;
544
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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 }
483
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234 }
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235 } else {
539
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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 }
544
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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
539
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253 if (perform_flush) {
544
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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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diff changeset
256 return 0;
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diff changeset
257 }
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diff changeset
258 size_t flush_pos = buffer->flush_func == NULL || buffer->flush_target == NULL
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diff changeset
259 ? buffer->pos
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260 : cx_buffer_write_flush_helper(buffer, buffer->bytes, 1, buffer->pos);
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diff changeset
261 if (flush_pos == buffer->pos) {
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diff changeset
262 // entire buffer has been flushed, we can reset
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diff changeset
263 buffer->size = buffer->pos = 0;
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diff changeset
264
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diff changeset
265 size_t items_flush; // how many items can also be directly flushed
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diff changeset
266 size_t items_keep; // how many items have to be written to the buffer
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diff changeset
267
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diff changeset
268 items_flush = flush_max >= required ? nitems : (flush_max - flush_pos) / size;
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diff changeset
269 if (items_flush > 0) {
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diff changeset
270 items_flush = cx_buffer_write_flush_helper(buffer, ptr, size, items_flush / size);
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diff changeset
271 // in case we could not flush everything, keep the rest
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diff changeset
272 }
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diff changeset
273 items_keep = nitems - items_flush;
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diff changeset
274 if (items_keep > 0) {
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diff changeset
275 // try again with the remaining stuff
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276 const unsigned char *new_ptr = ptr;
544
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277 new_ptr += items_flush * size;
567
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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);
544
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diff changeset
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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diff changeset
283 }
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diff changeset
284 } else if (flush_pos == 0) {
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diff changeset
285 // nothing could be flushed at all, we immediately give up without writing any data
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diff changeset
286 return 0;
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diff changeset
287 } else {
567
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diff changeset
288 // we were partially successful, we shift left and try again
544
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diff changeset
289 cxBufferShiftLeft(buffer, flush_pos);
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diff changeset
290 return cxBufferWrite(ptr, size, nitems, buffer);
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291 }
539
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diff changeset
292 } else {
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diff changeset
293 memcpy(buffer->bytes + buffer->pos, ptr, len);
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diff changeset
294 buffer->pos += len;
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diff changeset
295 if (buffer->pos > buffer->size) {
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diff changeset
296 buffer->size = buffer->pos;
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diff changeset
297 }
544
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diff changeset
298 return nitems_out;
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299 }
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300
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301 }
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302
538
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diff changeset
303 int cxBufferPut(
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diff changeset
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
483
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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) {
483
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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,
483
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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 }

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