src/buffer.c

Sun, 09 Apr 2023 19:06:16 +0200

author
Mike Becker <universe@uap-core.de>
date
Sun, 09 Apr 2023 19:06:16 +0200
changeset 678
78f943d76f50
parent 673
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child 683
aa0d09f2d81c
permissions
-rw-r--r--

reformat code

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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 int cxBufferSeek(
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74 CxBuffer *buffer,
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75 off_t offset,
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76 int whence
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77 ) {
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78 size_t npos;
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79 switch (whence) {
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80 case SEEK_CUR:
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81 npos = buffer->pos;
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82 break;
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83 case SEEK_END:
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84 npos = buffer->size;
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85 break;
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86 case SEEK_SET:
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87 npos = 0;
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88 break;
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89 default:
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90 return -1;
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91 }
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92
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93 size_t opos = npos;
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94 npos += offset;
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95
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96 if ((offset > 0 && npos < opos) || (offset < 0 && npos > opos)) {
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97 return -1;
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98 }
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99
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100 if (npos >= buffer->size) {
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101 return -1;
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102 } else {
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103 buffer->pos = npos;
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104 return 0;
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105 }
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106
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107 }
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108
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109 void cxBufferClear(CxBuffer *buffer) {
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110 memset(buffer->bytes, 0, buffer->size);
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111 buffer->size = 0;
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112 buffer->pos = 0;
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113 }
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114
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115 int cxBufferEof(CxBuffer const *buffer) {
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116 return buffer->pos >= buffer->size;
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117 }
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118
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119 int cxBufferMinimumCapacity(
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120 CxBuffer *buffer,
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121 size_t newcap
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122 ) {
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123 if (newcap <= buffer->capacity) {
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124 return 0;
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125 }
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126
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127 if (cxReallocate(buffer->allocator,
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128 (void **) &buffer->bytes, newcap) == 0) {
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129 buffer->capacity = newcap;
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130 return 0;
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131 } else {
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132 return -1;
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133 }
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134 }
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135
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136 /**
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137 * Helps flushing data to the flush target of a buffer.
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138 *
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139 * @param buffer the buffer containing the config
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140 * @param space the data to flush
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141 * @param size the element size
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142 * @param nitems the number of items
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143 * @return the number of items flushed
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144 */
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145 static size_t cx_buffer_write_flush_helper(
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146 CxBuffer *buffer,
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147 unsigned char const *space,
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148 size_t size,
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149 size_t nitems
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150 ) {
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151 size_t pos = 0;
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152 size_t remaining = nitems;
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153 size_t max_items = buffer->flush_blksize / size;
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154 while (remaining > 0) {
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155 size_t items = remaining > max_items ? max_items : remaining;
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156 size_t flushed = buffer->flush_func(
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diff changeset
157 space + pos,
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diff changeset
158 size, items,
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diff changeset
159 buffer->flush_target);
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diff changeset
160 if (flushed > 0) {
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161 pos += (flushed * size);
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162 remaining -= flushed;
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163 } else {
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164 // if no bytes can be flushed out anymore, we give up
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diff changeset
165 break;
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166 }
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167 }
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168 return nitems - remaining;
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169 }
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170
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171 size_t cxBufferWrite(
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172 void const *ptr,
483
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173 size_t size,
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174 size_t nitems,
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175 CxBuffer *buffer
483
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176 ) {
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177 // optimize for easy case
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178 if (size == 1 && (buffer->capacity - buffer->pos) >= nitems) {
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179 memcpy(buffer->bytes + buffer->pos, ptr, nitems);
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180 buffer->pos += nitems;
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181 if (buffer->pos > buffer->size) {
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182 buffer->size = buffer->pos;
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183 }
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184 return nitems;
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185 }
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186
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187 size_t len;
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188 size_t nitems_out = nitems;
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189 if (cx_szmul(size, nitems, &len)) {
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190 return 0;
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191 }
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192 size_t required = buffer->pos + len;
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193 if (buffer->pos > required) {
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194 return 0;
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195 }
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196
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197 bool perform_flush = false;
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198 if (required > buffer->capacity) {
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199 if ((buffer->flags & CX_BUFFER_AUTO_EXTEND) == CX_BUFFER_AUTO_EXTEND && required) {
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200 if (buffer->flush_blkmax > 0 && required > buffer->flush_threshold) {
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201 perform_flush = true;
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202 } else {
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203 if (cxBufferMinimumCapacity(buffer, required)) {
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204 return 0;
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205 }
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206 }
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207 } else {
539
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208 if (buffer->flush_blkmax > 0) {
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209 perform_flush = true;
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210 } else {
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211 // truncate data to be written, if we can neither extend nor flush
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212 len = buffer->capacity - buffer->pos;
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213 if (size > 1) {
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214 len -= len % size;
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215 }
544
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216 nitems_out = len / size;
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217 }
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218 }
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219 }
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220
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221 if (len == 0) {
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222 return len;
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223 }
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224
539
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225 if (perform_flush) {
544
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diff changeset
226 size_t flush_max;
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diff changeset
227 if (cx_szmul(buffer->flush_blkmax, buffer->flush_blksize, &flush_max)) {
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228 return 0;
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diff changeset
229 }
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diff changeset
230 size_t flush_pos = buffer->flush_func == NULL || buffer->flush_target == NULL
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diff changeset
231 ? buffer->pos
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232 : cx_buffer_write_flush_helper(buffer, buffer->bytes, 1, buffer->pos);
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diff changeset
233 if (flush_pos == buffer->pos) {
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diff changeset
234 // entire buffer has been flushed, we can reset
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diff changeset
235 buffer->size = buffer->pos = 0;
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diff changeset
236
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diff changeset
237 size_t items_flush; // how many items can also be directly flushed
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diff changeset
238 size_t items_keep; // how many items have to be written to the buffer
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diff changeset
239
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diff changeset
240 items_flush = flush_max >= required ? nitems : (flush_max - flush_pos) / size;
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diff changeset
241 if (items_flush > 0) {
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diff changeset
242 items_flush = cx_buffer_write_flush_helper(buffer, ptr, size, items_flush / size);
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diff changeset
243 // in case we could not flush everything, keep the rest
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diff changeset
244 }
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diff changeset
245 items_keep = nitems - items_flush;
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diff changeset
246 if (items_keep > 0) {
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diff changeset
247 // try again with the remaining stuff
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diff changeset
248 unsigned char const *new_ptr = ptr;
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diff changeset
249 new_ptr += items_flush * size;
567
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diff changeset
250 // report the directly flushed items as written plus the remaining stuff
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diff changeset
251 return items_flush + cxBufferWrite(new_ptr, size, items_keep, buffer);
544
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diff changeset
252 } else {
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diff changeset
253 // all items have been flushed - report them as written
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diff changeset
254 return nitems;
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diff changeset
255 }
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diff changeset
256 } else if (flush_pos == 0) {
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diff changeset
257 // nothing could be flushed at all, we immediately give up without writing any data
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diff changeset
258 return 0;
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diff changeset
259 } else {
567
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diff changeset
260 // we were partially successful, we shift left and try again
544
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diff changeset
261 cxBufferShiftLeft(buffer, flush_pos);
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diff changeset
262 return cxBufferWrite(ptr, size, nitems, buffer);
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diff changeset
263 }
539
9cd98da9ee17 #184 start implementation of the flush feature
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diff changeset
264 } else {
9cd98da9ee17 #184 start implementation of the flush feature
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diff changeset
265 memcpy(buffer->bytes + buffer->pos, ptr, len);
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diff changeset
266 buffer->pos += len;
9cd98da9ee17 #184 start implementation of the flush feature
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diff changeset
267 if (buffer->pos > buffer->size) {
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diff changeset
268 buffer->size = buffer->pos;
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diff changeset
269 }
544
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diff changeset
270 return nitems_out;
483
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271 }
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272
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273 }
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274
538
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diff changeset
275 int cxBufferPut(
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diff changeset
276 CxBuffer *buffer,
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diff changeset
277 int c
2cfbcbe86a7c #170 first basic write tests
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diff changeset
278 ) {
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diff changeset
279 c &= 0xFF;
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diff changeset
280 unsigned char const ch = c;
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diff changeset
281 if (cxBufferWrite(&ch, 1, 1, buffer) == 1) {
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diff changeset
282 return c;
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diff changeset
283 } else {
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diff changeset
284 return EOF;
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diff changeset
285 }
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diff changeset
286 }
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diff changeset
287
2cfbcbe86a7c #170 first basic write tests
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diff changeset
288 size_t cxBufferPutString(
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diff changeset
289 CxBuffer *buffer,
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diff changeset
290 const char *str
2cfbcbe86a7c #170 first basic write tests
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parents: 536
diff changeset
291 ) {
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diff changeset
292 return cxBufferWrite(str, 1, strlen(str), buffer);
2cfbcbe86a7c #170 first basic write tests
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diff changeset
293 }
2cfbcbe86a7c #170 first basic write tests
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diff changeset
294
483
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295 size_t cxBufferRead(
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296 void *ptr,
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diff changeset
297 size_t size,
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diff changeset
298 size_t nitems,
500
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diff changeset
299 CxBuffer *buffer
483
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300 ) {
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diff changeset
301 size_t len;
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diff changeset
302 if (cx_szmul(size, nitems, &len)) {
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diff changeset
303 return 0;
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
304 }
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parents:
diff changeset
305 if (buffer->pos + len > buffer->size) {
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diff changeset
306 len = buffer->size - buffer->pos;
929016224c3c add ported UCX buffer implementation
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diff changeset
307 if (size > 1) len -= len % size;
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
308 }
929016224c3c add ported UCX buffer implementation
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diff changeset
309
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310 if (len <= 0) {
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311 return len;
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312 }
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313
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314 memcpy(ptr, buffer->bytes + buffer->pos, len);
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315 buffer->pos += len;
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316
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317 return len / size;
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318 }
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319
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320 int cxBufferGet(CxBuffer *buffer) {
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321 if (cxBufferEof(buffer)) {
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322 return EOF;
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323 } else {
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324 int c = buffer->bytes[buffer->pos];
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325 buffer->pos++;
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326 return c;
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327 }
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328 }
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329
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330 int cxBufferShiftLeft(
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331 CxBuffer *buffer,
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332 size_t shift
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333 ) {
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334 if (shift >= buffer->size) {
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335 buffer->pos = buffer->size = 0;
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336 } else {
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337 memmove(buffer->bytes, buffer->bytes + shift, buffer->size - shift);
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338 buffer->size -= shift;
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339
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340 if (buffer->pos >= shift) {
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341 buffer->pos -= shift;
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342 } else {
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343 buffer->pos = 0;
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344 }
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345 }
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346 return 0;
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347 }
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348
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349 int cxBufferShiftRight(
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350 CxBuffer *buffer,
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351 size_t shift
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352 ) {
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353 size_t req_capacity = buffer->size + shift;
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354 size_t movebytes;
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355
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356 // auto extend buffer, if required and enabled
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357 if (buffer->capacity < req_capacity) {
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358 if ((buffer->flags & CX_BUFFER_AUTO_EXTEND) == CX_BUFFER_AUTO_EXTEND) {
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359 if (cxBufferMinimumCapacity(buffer, req_capacity)) {
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360 return 1;
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361 }
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362 movebytes = buffer->size;
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363 } else {
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364 movebytes = buffer->capacity - shift;
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365 }
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366 } else {
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367 movebytes = buffer->size;
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368 }
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369
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370 memmove(buffer->bytes + shift, buffer->bytes, movebytes);
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371 buffer->size = shift + movebytes;
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372
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373 buffer->pos += shift;
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374 if (buffer->pos > buffer->size) {
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375 buffer->pos = buffer->size;
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376 }
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377
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378 return 0;
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379 }
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380
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381 int cxBufferShift(
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382 CxBuffer *buffer,
483
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383 off_t shift
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384 ) {
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385 if (shift < 0) {
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386 return cxBufferShiftLeft(buffer, (size_t) (-shift));
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387 } else if (shift > 0) {
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388 return cxBufferShiftRight(buffer, (size_t) shift);
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389 } else {
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390 return 0;
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391 }
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392 }

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