src/buffer.c

Wed, 16 Nov 2022 22:27:46 +0100

author
Mike Becker <universe@uap-core.de>
date
Wed, 16 Nov 2022 22:27:46 +0100
changeset 610
de5d3ee6435f
parent 567
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child 650
77021e06b1a8
permissions
-rw-r--r--

#219 array list: implement add and at

Add uses the low level cx_array_copy function which is
now also implemented, but not tested by individual unit
tests.

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 */
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28
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29 #include "cx/buffer.h"
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30 #include "cx/utils.h"
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31
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32 #include <stdlib.h>
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33 #include <stdio.h>
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34 #include <string.h>
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35 #include <stdint.h>
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36
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37 int cxBufferInit(
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38 CxBuffer *buffer,
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39 void *space,
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40 size_t capacity,
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41 CxAllocator const *allocator,
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42 int flags
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43 ) {
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44 buffer->allocator = allocator;
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45 buffer->flags = flags;
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46 if (!space) {
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47 buffer->bytes = cxMalloc(allocator, capacity);
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48 if (buffer->bytes == NULL) {
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49 return 1;
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50 }
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51 buffer->flags |= CX_BUFFER_FREE_CONTENTS;
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52 } else {
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53 buffer->bytes = space;
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54 }
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55 buffer->capacity = capacity;
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56 buffer->size = 0;
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57 buffer->pos = 0;
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58
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59 buffer->flush_func = NULL;
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60 buffer->flush_target = NULL;
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61 buffer->flush_blkmax = 0;
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62 buffer->flush_blksize = 4096;
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63 buffer->flush_threshold = SIZE_MAX;
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64
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65 return 0;
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66 }
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67
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68 void cxBufferDestroy(CxBuffer *buffer) {
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69 if ((buffer->flags & CX_BUFFER_FREE_CONTENTS) == CX_BUFFER_FREE_CONTENTS) {
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70 cxFree(buffer->allocator, buffer->bytes);
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71 }
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72 }
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73
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74 int cxBufferSeek(
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75 CxBuffer *buffer,
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76 off_t offset,
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77 int whence
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78 ) {
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79 size_t npos;
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80 switch (whence) {
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81 case SEEK_CUR:
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82 npos = buffer->pos;
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83 break;
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84 case SEEK_END:
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85 npos = buffer->size;
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86 break;
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87 case SEEK_SET:
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88 npos = 0;
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89 break;
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90 default:
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91 return -1;
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92 }
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93
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94 size_t opos = npos;
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95 npos += offset;
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96
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97 if ((offset > 0 && npos < opos) || (offset < 0 && npos > opos)) {
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98 return -1;
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99 }
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100
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101 if (npos >= buffer->size) {
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102 return -1;
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103 } else {
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104 buffer->pos = npos;
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105 return 0;
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106 }
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107
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108 }
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109
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110 void cxBufferClear(CxBuffer *buffer) {
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111 memset(buffer->bytes, 0, buffer->size);
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112 buffer->size = 0;
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113 buffer->pos = 0;
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114 }
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115
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116 int cxBufferEof(CxBuffer const *buffer) {
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117 return buffer->pos >= buffer->size;
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118 }
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119
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120 int cxBufferMinimumCapacity(
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121 CxBuffer *buffer,
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122 size_t newcap
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123 ) {
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124 if (newcap <= buffer->capacity) {
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125 return 0;
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126 }
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127
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128 if (cxReallocate(buffer->allocator,
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129 (void **) &buffer->bytes, newcap) == 0) {
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130 buffer->capacity = newcap;
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131 return 0;
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132 } else {
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133 return -1;
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134 }
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135 }
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136
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137 /**
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138 * Helps flushing data to the flush target of a buffer.
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139 *
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140 * @param buffer the buffer containing the config
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141 * @param space the data to flush
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142 * @param size the element size
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143 * @param nitems the number of items
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144 * @return the number of items flushed
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145 */
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146 static size_t cx_buffer_write_flush_helper(
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147 CxBuffer *buffer,
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148 unsigned char const *space,
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149 size_t size,
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150 size_t nitems
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151 ) {
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152 size_t pos = 0;
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153 size_t remaining = nitems;
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154 size_t max_items = buffer->flush_blksize / size;
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155 while (remaining > 0) {
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156 size_t items = remaining > max_items ? max_items : remaining;
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157 size_t flushed = buffer->flush_func(
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158 space + pos,
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diff changeset
159 size, items,
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diff changeset
160 buffer->flush_target);
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diff changeset
161 if (flushed > 0) {
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diff changeset
162 pos += (flushed * size);
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163 remaining -= flushed;
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diff changeset
164 } else {
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diff changeset
165 // if no bytes can be flushed out anymore, we give up
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diff changeset
166 break;
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167 }
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168 }
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169 return nitems - remaining;
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170 }
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171
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172 size_t cxBufferWrite(
489
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173 void const *ptr,
483
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174 size_t size,
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175 size_t nitems,
500
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176 CxBuffer *buffer
483
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177 ) {
543
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178 // optimize for easy case
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179 if (size == 1 && (buffer->capacity - buffer->pos) >= nitems) {
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180 memcpy(buffer->bytes + buffer->pos, ptr, nitems);
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181 buffer->pos += nitems;
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182 if (buffer->pos > buffer->size) {
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183 buffer->size = buffer->pos;
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184 }
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185 return nitems;
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186 }
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187
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188 size_t len;
544
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189 size_t nitems_out = nitems;
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190 if (cx_szmul(size, nitems, &len)) {
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191 return 0;
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192 }
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193 size_t required = buffer->pos + len;
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194 if (buffer->pos > required) {
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195 return 0;
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196 }
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197
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198 bool perform_flush = false;
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199 if (required > buffer->capacity) {
539
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200 if ((buffer->flags & CX_BUFFER_AUTO_EXTEND) == CX_BUFFER_AUTO_EXTEND && required) {
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201 if (buffer->flush_blkmax > 0 && required > buffer->flush_threshold) {
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202 perform_flush = true;
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203 } else {
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204 if (cxBufferMinimumCapacity(buffer, required)) {
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205 return 0;
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206 }
483
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207 }
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208 } else {
539
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209 if (buffer->flush_blkmax > 0) {
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210 perform_flush = true;
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211 } else {
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212 // truncate data to be written, if we can neither extend nor flush
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213 len = buffer->capacity - buffer->pos;
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diff changeset
214 if (size > 1) {
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215 len -= len % size;
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216 }
544
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217 nitems_out = len / size;
483
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218 }
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219 }
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220 }
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221
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222 if (len == 0) {
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223 return len;
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224 }
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225
539
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226 if (perform_flush) {
544
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diff changeset
227 size_t flush_max;
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diff changeset
228 if (cx_szmul(buffer->flush_blkmax, buffer->flush_blksize, &flush_max)) {
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diff changeset
229 return 0;
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diff changeset
230 }
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diff changeset
231 size_t flush_pos = buffer->flush_func == NULL || buffer->flush_target == NULL
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diff changeset
232 ? buffer->pos
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diff changeset
233 : cx_buffer_write_flush_helper(buffer, buffer->bytes, 1, buffer->pos);
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diff changeset
234 if (flush_pos == buffer->pos) {
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diff changeset
235 // entire buffer has been flushed, we can reset
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diff changeset
236 buffer->size = buffer->pos = 0;
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diff changeset
237
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diff changeset
238 size_t items_flush; // how many items can also be directly flushed
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diff changeset
239 size_t items_keep; // how many items have to be written to the buffer
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diff changeset
240
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diff changeset
241 items_flush = flush_max >= required ? nitems : (flush_max - flush_pos) / size;
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diff changeset
242 if (items_flush > 0) {
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diff changeset
243 items_flush = cx_buffer_write_flush_helper(buffer, ptr, size, items_flush / size);
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diff changeset
244 // in case we could not flush everything, keep the rest
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diff changeset
245 }
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diff changeset
246 items_keep = nitems - items_flush;
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diff changeset
247 if (items_keep > 0) {
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diff changeset
248 // try again with the remaining stuff
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diff changeset
249 unsigned char const *new_ptr = ptr;
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diff changeset
250 new_ptr += items_flush * size;
567
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diff changeset
251 // report the directly flushed items as written plus the remaining stuff
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diff changeset
252 return items_flush + cxBufferWrite(new_ptr, size, items_keep, buffer);
544
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diff changeset
253 } else {
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diff changeset
254 // all items have been flushed - report them as written
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diff changeset
255 return nitems;
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diff changeset
256 }
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diff changeset
257 } else if (flush_pos == 0) {
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diff changeset
258 // nothing could be flushed at all, we immediately give up without writing any data
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diff changeset
259 return 0;
2e73456e5f84 #184 untested implementation of the flush feature
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diff changeset
260 } else {
567
f90a7cfe2480 #184 #170 more thorough flush testing
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diff changeset
261 // we were partially successful, we shift left and try again
544
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diff changeset
262 cxBufferShiftLeft(buffer, flush_pos);
2e73456e5f84 #184 untested implementation of the flush feature
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diff changeset
263 return cxBufferWrite(ptr, size, nitems, buffer);
2e73456e5f84 #184 untested implementation of the flush feature
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parents: 543
diff changeset
264 }
539
9cd98da9ee17 #184 start implementation of the flush feature
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diff changeset
265 } else {
9cd98da9ee17 #184 start implementation of the flush feature
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diff changeset
266 memcpy(buffer->bytes + buffer->pos, ptr, len);
9cd98da9ee17 #184 start implementation of the flush feature
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diff changeset
267 buffer->pos += len;
9cd98da9ee17 #184 start implementation of the flush feature
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diff changeset
268 if (buffer->pos > buffer->size) {
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diff changeset
269 buffer->size = buffer->pos;
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diff changeset
270 }
544
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diff changeset
271 return nitems_out;
483
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272 }
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diff changeset
273
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
274 }
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diff changeset
275
538
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diff changeset
276 int cxBufferPut(
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diff changeset
277 CxBuffer *buffer,
2cfbcbe86a7c #170 first basic write tests
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diff changeset
278 int c
2cfbcbe86a7c #170 first basic write tests
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diff changeset
279 ) {
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diff changeset
280 c &= 0xFF;
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diff changeset
281 unsigned char const ch = c;
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diff changeset
282 if (cxBufferWrite(&ch, 1, 1, buffer) == 1) {
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diff changeset
283 return c;
2cfbcbe86a7c #170 first basic write tests
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diff changeset
284 } else {
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diff changeset
285 return EOF;
2cfbcbe86a7c #170 first basic write tests
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parents: 536
diff changeset
286 }
2cfbcbe86a7c #170 first basic write tests
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diff changeset
287 }
2cfbcbe86a7c #170 first basic write tests
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diff changeset
288
2cfbcbe86a7c #170 first basic write tests
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diff changeset
289 size_t cxBufferPutString(
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parents: 536
diff changeset
290 CxBuffer *buffer,
2cfbcbe86a7c #170 first basic write tests
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diff changeset
291 const char *str
2cfbcbe86a7c #170 first basic write tests
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parents: 536
diff changeset
292 ) {
2cfbcbe86a7c #170 first basic write tests
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diff changeset
293 return cxBufferWrite(str, 1, strlen(str), buffer);
2cfbcbe86a7c #170 first basic write tests
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diff changeset
294 }
2cfbcbe86a7c #170 first basic write tests
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diff changeset
295
483
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296 size_t cxBufferRead(
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diff changeset
297 void *ptr,
929016224c3c add ported UCX buffer implementation
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diff changeset
298 size_t size,
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diff changeset
299 size_t nitems,
500
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diff changeset
300 CxBuffer *buffer
483
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diff changeset
301 ) {
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parents:
diff changeset
302 size_t len;
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
303 if (cx_szmul(size, nitems, &len)) {
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parents:
diff changeset
304 return 0;
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
305 }
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parents:
diff changeset
306 if (buffer->pos + len > buffer->size) {
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diff changeset
307 len = buffer->size - buffer->pos;
929016224c3c add ported UCX buffer implementation
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diff changeset
308 if (size > 1) len -= len % size;
929016224c3c add ported UCX buffer implementation
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309 }
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310
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311 if (len <= 0) {
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312 return len;
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313 }
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314
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315 memcpy(ptr, buffer->bytes + buffer->pos, len);
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316 buffer->pos += len;
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317
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318 return len / size;
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319 }
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320
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321 int cxBufferGet(CxBuffer *buffer) {
483
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322 if (cxBufferEof(buffer)) {
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323 return EOF;
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324 } else {
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325 int c = buffer->bytes[buffer->pos];
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326 buffer->pos++;
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327 return c;
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328 }
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329 }
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330
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331 int cxBufferShiftLeft(
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332 CxBuffer *buffer,
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333 size_t shift
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334 ) {
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335 if (shift >= buffer->size) {
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336 buffer->pos = buffer->size = 0;
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337 } else {
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338 memmove(buffer->bytes, buffer->bytes + shift, buffer->size - shift);
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339 buffer->size -= shift;
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340
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341 if (buffer->pos >= shift) {
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342 buffer->pos -= shift;
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343 } else {
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344 buffer->pos = 0;
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345 }
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346 }
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347 return 0;
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348 }
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349
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350 int cxBufferShiftRight(
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351 CxBuffer *buffer,
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352 size_t shift
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353 ) {
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354 size_t req_capacity = buffer->size + shift;
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355 size_t movebytes;
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356
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357 // auto extend buffer, if required and enabled
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358 if (buffer->capacity < req_capacity) {
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359 if ((buffer->flags & CX_BUFFER_AUTO_EXTEND) == CX_BUFFER_AUTO_EXTEND) {
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360 if (cxBufferMinimumCapacity(buffer, req_capacity)) {
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361 return 1;
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362 }
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363 movebytes = buffer->size;
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364 } else {
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365 movebytes = buffer->capacity - shift;
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366 }
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367 } else {
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368 movebytes = buffer->size;
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369 }
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370
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371 memmove(buffer->bytes + shift, buffer->bytes, movebytes);
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372 buffer->size = shift + movebytes;
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373
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374 buffer->pos += shift;
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375 if (buffer->pos > buffer->size) {
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376 buffer->pos = buffer->size;
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377 }
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378
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379 return 0;
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380 }
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381
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382 int cxBufferShift(
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383 CxBuffer *buffer,
483
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384 off_t shift
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385 ) {
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386 if (shift < 0) {
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387 return cxBufferShiftLeft(buffer, (size_t) (-shift));
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388 } else if (shift > 0) {
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389 return cxBufferShiftRight(buffer, (size_t) shift);
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390 } else {
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391 return 0;
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392 }
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393 }

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