src/buffer.c

Tue, 07 Feb 2023 21:53:06 +0100

author
Mike Becker <universe@uap-core.de>
date
Tue, 07 Feb 2023 21:53:06 +0100
changeset 652
bf817b825ed2
parent 650
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child 673
60fb6aec157d
permissions
-rw-r--r--

fix README showing how tests were run in the automake era

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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 buffer->allocator = allocator;
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43 buffer->flags = flags;
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44 if (!space) {
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45 buffer->bytes = cxMalloc(allocator, capacity);
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46 if (buffer->bytes == NULL) {
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47 return 1;
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48 }
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49 buffer->flags |= CX_BUFFER_FREE_CONTENTS;
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50 } else {
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51 buffer->bytes = space;
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52 }
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53 buffer->capacity = capacity;
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54 buffer->size = 0;
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55 buffer->pos = 0;
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56
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57 buffer->flush_func = NULL;
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58 buffer->flush_target = NULL;
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59 buffer->flush_blkmax = 0;
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60 buffer->flush_blksize = 4096;
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61 buffer->flush_threshold = SIZE_MAX;
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62
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63 return 0;
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64 }
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65
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66 void cxBufferDestroy(CxBuffer *buffer) {
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67 if ((buffer->flags & CX_BUFFER_FREE_CONTENTS) == CX_BUFFER_FREE_CONTENTS) {
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68 cxFree(buffer->allocator, buffer->bytes);
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69 }
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70 }
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71
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72 int cxBufferSeek(
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73 CxBuffer *buffer,
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74 off_t offset,
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75 int whence
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76 ) {
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77 size_t npos;
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78 switch (whence) {
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79 case SEEK_CUR:
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80 npos = buffer->pos;
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81 break;
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82 case SEEK_END:
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83 npos = buffer->size;
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84 break;
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85 case SEEK_SET:
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86 npos = 0;
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87 break;
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88 default:
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89 return -1;
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90 }
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91
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92 size_t opos = npos;
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93 npos += offset;
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94
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95 if ((offset > 0 && npos < opos) || (offset < 0 && npos > opos)) {
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96 return -1;
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97 }
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98
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99 if (npos >= buffer->size) {
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100 return -1;
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101 } else {
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102 buffer->pos = npos;
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103 return 0;
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104 }
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105
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106 }
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107
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108 void cxBufferClear(CxBuffer *buffer) {
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109 memset(buffer->bytes, 0, buffer->size);
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110 buffer->size = 0;
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111 buffer->pos = 0;
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112 }
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113
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114 int cxBufferEof(CxBuffer const *buffer) {
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115 return buffer->pos >= buffer->size;
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116 }
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117
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118 int cxBufferMinimumCapacity(
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119 CxBuffer *buffer,
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120 size_t newcap
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121 ) {
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122 if (newcap <= buffer->capacity) {
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123 return 0;
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124 }
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125
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126 if (cxReallocate(buffer->allocator,
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127 (void **) &buffer->bytes, newcap) == 0) {
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128 buffer->capacity = newcap;
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129 return 0;
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130 } else {
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131 return -1;
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132 }
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133 }
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134
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135 /**
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136 * Helps flushing data to the flush target of a buffer.
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137 *
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138 * @param buffer the buffer containing the config
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139 * @param space the data to flush
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140 * @param size the element size
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141 * @param nitems the number of items
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142 * @return the number of items flushed
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143 */
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144 static size_t cx_buffer_write_flush_helper(
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145 CxBuffer *buffer,
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146 unsigned char const *space,
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147 size_t size,
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148 size_t nitems
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149 ) {
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150 size_t pos = 0;
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151 size_t remaining = nitems;
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152 size_t max_items = buffer->flush_blksize / size;
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153 while (remaining > 0) {
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154 size_t items = remaining > max_items ? max_items : remaining;
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155 size_t flushed = buffer->flush_func(
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156 space + pos,
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diff changeset
157 size, items,
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diff changeset
158 buffer->flush_target);
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diff changeset
159 if (flushed > 0) {
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160 pos += (flushed * size);
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161 remaining -= flushed;
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diff changeset
162 } else {
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163 // if no bytes can be flushed out anymore, we give up
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diff changeset
164 break;
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165 }
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166 }
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167 return nitems - remaining;
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168 }
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169
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170 size_t cxBufferWrite(
489
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171 void const *ptr,
483
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172 size_t size,
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173 size_t nitems,
500
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174 CxBuffer *buffer
483
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175 ) {
543
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176 // optimize for easy case
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177 if (size == 1 && (buffer->capacity - buffer->pos) >= nitems) {
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178 memcpy(buffer->bytes + buffer->pos, ptr, nitems);
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179 buffer->pos += nitems;
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180 if (buffer->pos > buffer->size) {
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181 buffer->size = buffer->pos;
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182 }
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183 return nitems;
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184 }
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185
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186 size_t len;
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187 size_t nitems_out = nitems;
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188 if (cx_szmul(size, nitems, &len)) {
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189 return 0;
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190 }
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191 size_t required = buffer->pos + len;
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192 if (buffer->pos > required) {
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193 return 0;
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194 }
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195
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196 bool perform_flush = false;
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197 if (required > buffer->capacity) {
539
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198 if ((buffer->flags & CX_BUFFER_AUTO_EXTEND) == CX_BUFFER_AUTO_EXTEND && required) {
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199 if (buffer->flush_blkmax > 0 && required > buffer->flush_threshold) {
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200 perform_flush = true;
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201 } else {
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202 if (cxBufferMinimumCapacity(buffer, required)) {
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203 return 0;
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204 }
483
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205 }
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206 } else {
539
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207 if (buffer->flush_blkmax > 0) {
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208 perform_flush = true;
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209 } else {
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210 // truncate data to be written, if we can neither extend nor flush
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211 len = buffer->capacity - buffer->pos;
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diff changeset
212 if (size > 1) {
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213 len -= len % size;
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214 }
544
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215 nitems_out = len / size;
483
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216 }
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217 }
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218 }
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219
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220 if (len == 0) {
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221 return len;
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222 }
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223
539
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224 if (perform_flush) {
544
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diff changeset
225 size_t flush_max;
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diff changeset
226 if (cx_szmul(buffer->flush_blkmax, buffer->flush_blksize, &flush_max)) {
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diff changeset
227 return 0;
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diff changeset
228 }
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diff changeset
229 size_t flush_pos = buffer->flush_func == NULL || buffer->flush_target == NULL
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diff changeset
230 ? buffer->pos
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231 : cx_buffer_write_flush_helper(buffer, buffer->bytes, 1, buffer->pos);
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diff changeset
232 if (flush_pos == buffer->pos) {
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diff changeset
233 // entire buffer has been flushed, we can reset
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diff changeset
234 buffer->size = buffer->pos = 0;
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diff changeset
235
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diff changeset
236 size_t items_flush; // how many items can also be directly flushed
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diff changeset
237 size_t items_keep; // how many items have to be written to the buffer
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diff changeset
238
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diff changeset
239 items_flush = flush_max >= required ? nitems : (flush_max - flush_pos) / size;
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diff changeset
240 if (items_flush > 0) {
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diff changeset
241 items_flush = cx_buffer_write_flush_helper(buffer, ptr, size, items_flush / size);
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diff changeset
242 // in case we could not flush everything, keep the rest
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diff changeset
243 }
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diff changeset
244 items_keep = nitems - items_flush;
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diff changeset
245 if (items_keep > 0) {
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diff changeset
246 // try again with the remaining stuff
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diff changeset
247 unsigned char const *new_ptr = ptr;
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diff changeset
248 new_ptr += items_flush * size;
567
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diff changeset
249 // report the directly flushed items as written plus the remaining stuff
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diff changeset
250 return items_flush + cxBufferWrite(new_ptr, size, items_keep, buffer);
544
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diff changeset
251 } else {
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diff changeset
252 // all items have been flushed - report them as written
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diff changeset
253 return nitems;
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diff changeset
254 }
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diff changeset
255 } else if (flush_pos == 0) {
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diff changeset
256 // nothing could be flushed at all, we immediately give up without writing any data
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diff changeset
257 return 0;
2e73456e5f84 #184 untested implementation of the flush feature
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parents: 543
diff changeset
258 } else {
567
f90a7cfe2480 #184 #170 more thorough flush testing
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diff changeset
259 // we were partially successful, we shift left and try again
544
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diff changeset
260 cxBufferShiftLeft(buffer, flush_pos);
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diff changeset
261 return cxBufferWrite(ptr, size, nitems, buffer);
2e73456e5f84 #184 untested implementation of the flush feature
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diff changeset
262 }
539
9cd98da9ee17 #184 start implementation of the flush feature
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diff changeset
263 } else {
9cd98da9ee17 #184 start implementation of the flush feature
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diff changeset
264 memcpy(buffer->bytes + buffer->pos, ptr, len);
9cd98da9ee17 #184 start implementation of the flush feature
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diff changeset
265 buffer->pos += len;
9cd98da9ee17 #184 start implementation of the flush feature
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diff changeset
266 if (buffer->pos > buffer->size) {
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diff changeset
267 buffer->size = buffer->pos;
9cd98da9ee17 #184 start implementation of the flush feature
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diff changeset
268 }
544
2e73456e5f84 #184 untested implementation of the flush feature
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diff changeset
269 return nitems_out;
483
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270 }
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271
929016224c3c add ported UCX buffer implementation
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272 }
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273
538
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diff changeset
274 int cxBufferPut(
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diff changeset
275 CxBuffer *buffer,
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diff changeset
276 int c
2cfbcbe86a7c #170 first basic write tests
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diff changeset
277 ) {
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diff changeset
278 c &= 0xFF;
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diff changeset
279 unsigned char const ch = c;
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diff changeset
280 if (cxBufferWrite(&ch, 1, 1, buffer) == 1) {
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diff changeset
281 return c;
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diff changeset
282 } else {
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diff changeset
283 return EOF;
2cfbcbe86a7c #170 first basic write tests
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diff changeset
284 }
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diff changeset
285 }
2cfbcbe86a7c #170 first basic write tests
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diff changeset
286
2cfbcbe86a7c #170 first basic write tests
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diff changeset
287 size_t cxBufferPutString(
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diff changeset
288 CxBuffer *buffer,
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diff changeset
289 const char *str
2cfbcbe86a7c #170 first basic write tests
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parents: 536
diff changeset
290 ) {
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diff changeset
291 return cxBufferWrite(str, 1, strlen(str), buffer);
2cfbcbe86a7c #170 first basic write tests
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diff changeset
292 }
2cfbcbe86a7c #170 first basic write tests
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diff changeset
293
483
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294 size_t cxBufferRead(
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295 void *ptr,
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diff changeset
296 size_t size,
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diff changeset
297 size_t nitems,
500
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diff changeset
298 CxBuffer *buffer
483
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299 ) {
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diff changeset
300 size_t len;
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
301 if (cx_szmul(size, nitems, &len)) {
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diff changeset
302 return 0;
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
303 }
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
304 if (buffer->pos + len > buffer->size) {
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diff changeset
305 len = buffer->size - buffer->pos;
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diff changeset
306 if (size > 1) len -= len % size;
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
307 }
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
308
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
309 if (len <= 0) {
929016224c3c add ported UCX buffer implementation
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310 return len;
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311 }
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312
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313 memcpy(ptr, buffer->bytes + buffer->pos, len);
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314 buffer->pos += len;
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315
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316 return len / size;
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317 }
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318
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319 int cxBufferGet(CxBuffer *buffer) {
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320 if (cxBufferEof(buffer)) {
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321 return EOF;
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322 } else {
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323 int c = buffer->bytes[buffer->pos];
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324 buffer->pos++;
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325 return c;
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326 }
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327 }
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328
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329 int cxBufferShiftLeft(
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330 CxBuffer *buffer,
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331 size_t shift
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332 ) {
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333 if (shift >= buffer->size) {
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334 buffer->pos = buffer->size = 0;
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335 } else {
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336 memmove(buffer->bytes, buffer->bytes + shift, buffer->size - shift);
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337 buffer->size -= shift;
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338
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339 if (buffer->pos >= shift) {
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340 buffer->pos -= shift;
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341 } else {
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342 buffer->pos = 0;
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343 }
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344 }
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345 return 0;
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346 }
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347
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348 int cxBufferShiftRight(
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349 CxBuffer *buffer,
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350 size_t shift
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351 ) {
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352 size_t req_capacity = buffer->size + shift;
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353 size_t movebytes;
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354
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355 // auto extend buffer, if required and enabled
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356 if (buffer->capacity < req_capacity) {
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357 if ((buffer->flags & CX_BUFFER_AUTO_EXTEND) == CX_BUFFER_AUTO_EXTEND) {
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358 if (cxBufferMinimumCapacity(buffer, req_capacity)) {
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359 return 1;
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360 }
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361 movebytes = buffer->size;
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362 } else {
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363 movebytes = buffer->capacity - shift;
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364 }
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365 } else {
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366 movebytes = buffer->size;
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367 }
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368
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369 memmove(buffer->bytes + shift, buffer->bytes, movebytes);
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370 buffer->size = shift + movebytes;
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371
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372 buffer->pos += shift;
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373 if (buffer->pos > buffer->size) {
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374 buffer->pos = buffer->size;
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375 }
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376
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377 return 0;
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378 }
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379
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380 int cxBufferShift(
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381 CxBuffer *buffer,
483
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382 off_t shift
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383 ) {
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384 if (shift < 0) {
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385 return cxBufferShiftLeft(buffer, (size_t) (-shift));
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386 } else if (shift > 0) {
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387 return cxBufferShiftRight(buffer, (size_t) shift);
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388 } else {
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389 return 0;
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390 }
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391 }

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