src/buffer.c

Sat, 09 Apr 2022 18:02:53 +0200

author
Mike Becker <universe@uap-core.de>
date
Sat, 09 Apr 2022 18:02:53 +0200
changeset 509
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parent 501
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child 529
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permissions
-rw-r--r--

#129 - remove test code duplication

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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 <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 *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 memset(buffer->bytes, 0, capacity);
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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
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57 buffer->pos = 0;
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58
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59 return 0;
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60 }
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61
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62 void cxBufferDestroy(CxBuffer *buffer) {
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63 if ((buffer->flags & CX_BUFFER_FREE_CONTENTS) == CX_BUFFER_FREE_CONTENTS) {
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64 cxFree(buffer->allocator, buffer->bytes);
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65 }
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66 }
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67
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68 CxBuffer *cxBufferExtract(
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69 CxBuffer *src,
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70 size_t start,
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71 size_t length,
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72 int flags
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73 ) {
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74 if (src->size == 0 || length == 0 ||
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75 ((size_t) -1) - start < length || start + length > src->capacity) {
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76 return NULL;
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77 }
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78
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79 CxBuffer *dst = (CxBuffer *) malloc(sizeof(cx_buffer_s));
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80 if (dst) {
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81 dst->bytes = malloc(length);
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82 if (!dst->bytes) {
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83 free(dst);
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84 return NULL;
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85 }
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86 dst->capacity = length;
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87 dst->size = length;
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88 dst->flags = flags | CX_BUFFER_FREE_CONTENTS;
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89 dst->pos = 0;
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90 memcpy(dst->bytes, src->bytes + start, length);
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91 }
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92 return dst;
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93 }
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94
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95 int cxBufferSeek(
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96 CxBuffer *buffer,
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97 off_t offset,
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98 int whence
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99 ) {
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100 size_t npos;
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101 switch (whence) {
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102 case SEEK_CUR:
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103 npos = buffer->pos;
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104 break;
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105 case SEEK_END:
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106 npos = buffer->size;
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107 break;
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108 case SEEK_SET:
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109 npos = 0;
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110 break;
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111 default:
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112 return -1;
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113 }
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114
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115 size_t opos = npos;
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116 npos += offset;
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117
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118 if ((offset > 0 && npos < opos) || (offset < 0 && npos > opos)) {
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119 return -1;
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120 }
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121
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122 if (npos >= buffer->size) {
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123 return -1;
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124 } else {
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125 buffer->pos = npos;
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126 return 0;
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127 }
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128
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129 }
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130
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131 int cxBufferEof(CxBuffer *buffer) {
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132 return buffer->pos >= buffer->size;
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133 }
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134
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135 int cxBufferMinimumCapacity(
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136 CxBuffer *buffer,
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137 size_t additional_bytes
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138 ) {
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139 size_t newcap = buffer->capacity + additional_bytes;
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140
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141 // overflow protection
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142 if (newcap < buffer->capacity) {
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143 return -1;
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144 }
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145
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146 unsigned char *newspace = realloc(buffer->bytes, newcap);
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147 if (newspace) {
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148 memset(newspace + buffer->size, 0, newcap - buffer->size);
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149 buffer->bytes = newspace;
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150 buffer->capacity = newcap;
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151 } else {
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152 return -1;
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153 }
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154
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155 return 0;
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156 }
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157
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158 size_t cxBufferWrite(
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159 void const *ptr,
483
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160 size_t size,
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161 size_t nitems,
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162 CxBuffer *buffer
483
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163 ) {
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164 size_t len;
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165 if (cx_szmul(size, nitems, &len)) {
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166 return 0;
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167 }
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168 size_t required = buffer->pos + len;
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169 if (buffer->pos > required) {
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170 return 0;
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171 }
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172
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173 if (required > buffer->capacity) {
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174 if ((buffer->flags & CX_BUFFER_AUTO_EXTEND) == CX_BUFFER_AUTO_EXTEND) {
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175 if (cxBufferMinimumCapacity(buffer, required)) {
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176 return 0;
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177 }
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178 } else {
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179 len = buffer->capacity - buffer->pos;
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180 if (size > 1) {
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181 len -= len % size;
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182 }
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183 }
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184 }
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185
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186 if (len == 0) {
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187 return len;
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188 }
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189
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190 memcpy(buffer->bytes + buffer->pos, ptr, len);
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191 buffer->pos += len;
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192 if (buffer->pos > buffer->size) {
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193 buffer->size = buffer->pos;
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194 }
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195
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196 return len / size;
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197 }
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198
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199 size_t cxBufferRead(
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200 void *ptr,
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201 size_t size,
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202 size_t nitems,
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203 CxBuffer *buffer
483
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204 ) {
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205 size_t len;
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206 if (cx_szmul(size, nitems, &len)) {
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207 return 0;
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208 }
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209 if (buffer->pos + len > buffer->size) {
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210 len = buffer->size - buffer->pos;
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211 if (size > 1) len -= len % size;
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212 }
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213
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214 if (len <= 0) {
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215 return len;
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216 }
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217
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218 memcpy(ptr, buffer->bytes + buffer->pos, len);
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219 buffer->pos += len;
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220
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221 return len / size;
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222 }
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223
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224 int cxBufferPut(
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225 CxBuffer *buffer,
483
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226 int c
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227 ) {
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228 if (buffer->pos >= buffer->capacity) {
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229 if ((buffer->flags & CX_BUFFER_AUTO_EXTEND) == CX_BUFFER_AUTO_EXTEND) {
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230 if (cxBufferMinimumCapacity(buffer, buffer->capacity + 1)) {
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231 return EOF;
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232 }
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233 } else {
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234 return EOF;
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235 }
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236 }
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237
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238 c &= 0xFF;
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239 buffer->bytes[buffer->pos] = (unsigned char) c;
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240 buffer->pos++;
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241 if (buffer->pos > buffer->size) {
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242 buffer->size = buffer->pos;
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243 }
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244 return c;
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245 }
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246
500
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247 int cxBufferGet(CxBuffer *buffer) {
483
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248 if (cxBufferEof(buffer)) {
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249 return EOF;
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250 } else {
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251 int c = buffer->bytes[buffer->pos];
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252 buffer->pos++;
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253 return c;
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254 }
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255 }
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256
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257 size_t cxBufferPutString(
500
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258 CxBuffer *buffer,
483
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259 const char *str
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260 ) {
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261 return cxBufferWrite(str, 1, strlen(str), buffer);
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262 }
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263
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264 int cxBufferShiftLeft(
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265 CxBuffer *buffer,
483
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266 size_t shift
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267 ) {
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268 if (shift >= buffer->size) {
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269 buffer->pos = buffer->size = 0;
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270 } else {
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271 memmove(buffer->bytes, buffer->bytes + shift, buffer->size - shift);
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272 buffer->size -= shift;
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273
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diff changeset
274 if (buffer->pos >= shift) {
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275 buffer->pos -= shift;
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276 } else {
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277 buffer->pos = 0;
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278 }
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279 }
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280 return 0;
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281 }
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282
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283 int cxBufferShiftRight(
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284 CxBuffer *buffer,
483
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285 size_t shift
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286 ) {
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287 size_t req_capacity = buffer->size + shift;
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288 size_t movebytes;
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289
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290 // auto extend buffer, if required and enabled
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291 if (buffer->capacity < req_capacity) {
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292 if ((buffer->flags & CX_BUFFER_AUTO_EXTEND) == CX_BUFFER_AUTO_EXTEND) {
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293 if (cxBufferMinimumCapacity(buffer, req_capacity)) {
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294 return 1;
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295 }
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296 movebytes = buffer->size;
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297 } else {
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298 movebytes = buffer->capacity - shift;
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diff changeset
299 }
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300 } else {
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301 movebytes = buffer->size;
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302 }
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diff changeset
303
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304 memmove(buffer->bytes + shift, buffer->bytes, movebytes);
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305 buffer->size = shift + movebytes;
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diff changeset
306
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307 buffer->pos += shift;
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diff changeset
308 if (buffer->pos > buffer->size) {
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309 buffer->pos = buffer->size;
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310 }
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diff changeset
311
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312 return 0;
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diff changeset
313 }
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314
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315 int cxBufferShift(
500
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316 CxBuffer *buffer,
483
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317 off_t shift
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318 ) {
929016224c3c add ported UCX buffer implementation
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diff changeset
319 if (shift < 0) {
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diff changeset
320 return cxBufferShiftLeft(buffer, (size_t) (-shift));
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
321 } else if (shift > 0) {
929016224c3c add ported UCX buffer implementation
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322 return cxBufferShiftRight(buffer, (size_t) shift);
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323 } else {
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324 return 0;
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325 }
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326 }

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