src/ucx/buffer.c

Sun, 11 Jun 2023 15:53:55 +0200

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Sun, 11 Jun 2023 15:53:55 +0200
changeset 502
11ac3761c0e3
parent 490
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permissions
-rw-r--r--

fix non-blocking CGI handler and non-blocking SSL-IO

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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 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 int cxBufferEof(CxBuffer const *buffer) {
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139 return buffer->pos >= buffer->size;
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140 }
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141
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142 int cxBufferMinimumCapacity(
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143 CxBuffer *buffer,
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144 size_t newcap
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145 ) {
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146 if (newcap <= buffer->capacity) {
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147 return 0;
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148 }
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149
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150 if (cxReallocate(buffer->allocator,
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151 (void **) &buffer->bytes, newcap) == 0) {
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152 buffer->capacity = newcap;
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153 return 0;
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154 } else {
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155 return -1;
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156 }
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157 }
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158
415
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159 /**
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160 * Helps flushing data to the flush target of a buffer.
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161 *
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162 * @param buffer the buffer containing the config
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163 * @param space the data to flush
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164 * @param size the element size
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165 * @param nitems the number of items
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166 * @return the number of items flushed
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167 */
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168 static size_t cx_buffer_write_flush_helper(
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169 CxBuffer *buffer,
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170 unsigned char const *space,
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171 size_t size,
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172 size_t nitems
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173 ) {
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174 size_t pos = 0;
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175 size_t remaining = nitems;
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176 size_t max_items = buffer->flush_blksize / size;
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177 while (remaining > 0) {
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178 size_t items = remaining > max_items ? max_items : remaining;
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179 size_t flushed = buffer->flush_func(
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180 space + pos,
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181 size, items,
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182 buffer->flush_target);
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183 if (flushed > 0) {
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184 pos += (flushed * size);
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185 remaining -= flushed;
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186 } else {
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187 // if no bytes can be flushed out anymore, we give up
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188 break;
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189 }
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190 }
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191 return nitems - remaining;
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192 }
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193
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194 size_t cxBufferWrite(
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195 void const *ptr,
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196 size_t size,
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197 size_t nitems,
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198 CxBuffer *buffer
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199 ) {
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200 // optimize for easy case
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201 if (size == 1 && (buffer->capacity - buffer->pos) >= nitems) {
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202 memcpy(buffer->bytes + buffer->pos, ptr, nitems);
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203 buffer->pos += nitems;
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204 if (buffer->pos > buffer->size) {
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205 buffer->size = buffer->pos;
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206 }
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207 return nitems;
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208 }
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209
254
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210 size_t len;
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211 size_t nitems_out = nitems;
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212 if (cx_szmul(size, nitems, &len)) {
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213 return 0;
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214 }
99
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215 size_t required = buffer->pos + len;
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216 if (buffer->pos > required) {
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217 return 0;
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218 }
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219
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220 bool perform_flush = false;
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221 if (required > buffer->capacity) {
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222 if ((buffer->flags & CX_BUFFER_AUTO_EXTEND) == CX_BUFFER_AUTO_EXTEND && required) {
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223 if (buffer->flush_blkmax > 0 && required > buffer->flush_threshold) {
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224 perform_flush = true;
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225 } else {
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226 if (cxBufferMinimumCapacity(buffer, required)) {
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227 return 0;
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228 }
91
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229 }
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230 } else {
415
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231 if (buffer->flush_blkmax > 0) {
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232 perform_flush = true;
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233 } else {
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234 // truncate data to be written, if we can neither extend nor flush
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235 len = buffer->capacity - buffer->pos;
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236 if (size > 1) {
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237 len -= len % size;
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238 }
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239 nitems_out = len / size;
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240 }
91
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241 }
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242 }
415
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243
99
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244 if (len == 0) {
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245 return len;
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246 }
415
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247
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248 if (perform_flush) {
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249 size_t flush_max;
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250 if (cx_szmul(buffer->flush_blkmax, buffer->flush_blksize, &flush_max)) {
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251 return 0;
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252 }
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253 size_t flush_pos = buffer->flush_func == NULL || buffer->flush_target == NULL
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254 ? buffer->pos
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255 : cx_buffer_write_flush_helper(buffer, buffer->bytes, 1, buffer->pos);
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256 if (flush_pos == buffer->pos) {
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257 // entire buffer has been flushed, we can reset
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258 buffer->size = buffer->pos = 0;
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259
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260 size_t items_flush; // how many items can also be directly flushed
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261 size_t items_keep; // how many items have to be written to the buffer
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262
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263 items_flush = flush_max >= required ? nitems : (flush_max - flush_pos) / size;
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264 if (items_flush > 0) {
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265 items_flush = cx_buffer_write_flush_helper(buffer, ptr, size, items_flush / size);
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266 // in case we could not flush everything, keep the rest
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267 }
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268 items_keep = nitems - items_flush;
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269 if (items_keep > 0) {
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270 // try again with the remaining stuff
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271 unsigned char const *new_ptr = ptr;
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272 new_ptr += items_flush * size;
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273 // report the directly flushed items as written plus the remaining stuff
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274 return items_flush + cxBufferWrite(new_ptr, size, items_keep, buffer);
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275 } else {
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276 // all items have been flushed - report them as written
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277 return nitems;
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278 }
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279 } else if (flush_pos == 0) {
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280 // nothing could be flushed at all, we immediately give up without writing any data
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281 return 0;
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282 } else {
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283 // we were partially successful, we shift left and try again
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284 cxBufferShiftLeft(buffer, flush_pos);
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285 return cxBufferWrite(ptr, size, nitems, buffer);
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286 }
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287 } else {
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288 memcpy(buffer->bytes + buffer->pos, ptr, len);
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289 buffer->pos += len;
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290 if (buffer->pos > buffer->size) {
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291 buffer->size = buffer->pos;
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292 }
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diff changeset
293 return nitems_out;
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294 }
415
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diff changeset
295
91
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296 }
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297
415
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diff changeset
298 int cxBufferPut(
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299 CxBuffer *buffer,
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diff changeset
300 int c
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diff changeset
301 ) {
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302 c &= 0xFF;
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diff changeset
303 unsigned char const ch = c;
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304 if (cxBufferWrite(&ch, 1, 1, buffer) == 1) {
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305 return c;
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306 } else {
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diff changeset
307 return EOF;
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diff changeset
308 }
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309 }
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310
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311 size_t cxBufferPutString(
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312 CxBuffer *buffer,
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313 const char *str
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314 ) {
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315 return cxBufferWrite(str, 1, strlen(str), buffer);
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316 }
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317
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318 size_t cxBufferRead(
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319 void *ptr,
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320 size_t size,
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321 size_t nitems,
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322 CxBuffer *buffer
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323 ) {
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324 size_t len;
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325 if (cx_szmul(size, nitems, &len)) {
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326 return 0;
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327 }
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328 if (buffer->pos + len > buffer->size) {
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329 len = buffer->size - buffer->pos;
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330 if (size > 1) len -= len % size;
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331 }
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332
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333 if (len <= 0) {
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334 return len;
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335 }
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336
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337 memcpy(ptr, buffer->bytes + buffer->pos, len);
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338 buffer->pos += len;
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339
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340 return len / size;
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341 }
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342
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343 int cxBufferGet(CxBuffer *buffer) {
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344 if (cxBufferEof(buffer)) {
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345 return EOF;
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346 } else {
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347 int c = buffer->bytes[buffer->pos];
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348 buffer->pos++;
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349 return c;
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350 }
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351 }
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352
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353 int cxBufferShiftLeft(
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354 CxBuffer *buffer,
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355 size_t shift
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356 ) {
254
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357 if (shift >= buffer->size) {
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358 buffer->pos = buffer->size = 0;
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359 } else {
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360 memmove(buffer->bytes, buffer->bytes + shift, buffer->size - shift);
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361 buffer->size -= shift;
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362
254
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363 if (buffer->pos >= shift) {
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364 buffer->pos -= shift;
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365 } else {
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366 buffer->pos = 0;
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367 }
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368 }
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369 return 0;
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370 }
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371
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372 int cxBufferShiftRight(
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373 CxBuffer *buffer,
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374 size_t shift
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375 ) {
254
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376 size_t req_capacity = buffer->size + shift;
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377 size_t movebytes;
415
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diff changeset
378
254
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379 // auto extend buffer, if required and enabled
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380 if (buffer->capacity < req_capacity) {
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381 if ((buffer->flags & CX_BUFFER_AUTO_EXTEND) == CX_BUFFER_AUTO_EXTEND) {
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382 if (cxBufferMinimumCapacity(buffer, req_capacity)) {
254
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383 return 1;
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384 }
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385 movebytes = buffer->size;
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386 } else {
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387 movebytes = buffer->capacity - shift;
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388 }
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389 } else {
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390 movebytes = buffer->size;
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391 }
415
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392
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393 memmove(buffer->bytes + shift, buffer->bytes, movebytes);
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394 buffer->size = shift + movebytes;
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diff changeset
395
254
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396 buffer->pos += shift;
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397 if (buffer->pos > buffer->size) {
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398 buffer->pos = buffer->size;
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399 }
415
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diff changeset
400
254
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diff changeset
401 return 0;
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diff changeset
402 }
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403
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diff changeset
404 int cxBufferShift(
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405 CxBuffer *buffer,
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406 off_t shift
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407 ) {
254
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408 if (shift < 0) {
415
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diff changeset
409 return cxBufferShiftLeft(buffer, (size_t) (-shift));
254
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410 } else if (shift > 0) {
415
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411 return cxBufferShiftRight(buffer, (size_t) shift);
254
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412 } else {
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413 return 0;
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414 }
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diff changeset
415 }

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