src/buffer.c

Tue, 28 Dec 2021 17:49:52 +0100

author
Mike Becker <universe@uap-core.de>
date
Tue, 28 Dec 2021 17:49:52 +0100
changeset 491
6d538177f746
parent 489
af6be1e123aa
child 500
eb9e7bd40a8e
permissions
-rw-r--r--

fix missing cleanup in test_hl_linked_list_from_array

483
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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 CxBuffer cxBufferCreate(
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36 void *space,
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37 size_t capacity,
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38 int flags
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39 ) {
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40 CxBuffer buffer = (CxBuffer) malloc(sizeof(cx_buffer_s));
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41 if (buffer) {
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42 buffer->flags = flags;
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43 if (!space) {
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44 buffer->bytes = malloc(capacity);
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45 if (!buffer->bytes) {
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46 free(buffer);
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47 return NULL;
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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
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60 return buffer;
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61 }
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62
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63 void cxBufferDestroy(CxBuffer buffer) {
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64 if ((buffer->flags & CX_BUFFER_FREE_CONTENTS) == CX_BUFFER_FREE_CONTENTS) {
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65 free(buffer->bytes);
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66 }
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67 free(buffer);
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68 }
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69
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70 CxBuffer cxBufferExtract(
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71 CxBuffer src,
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72 size_t start,
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73 size_t length,
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74 int flags
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75 ) {
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76 if (src->size == 0 || length == 0 ||
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77 ((size_t) -1) - start < length || start + length > src->capacity) {
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78 return NULL;
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79 }
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80
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81 CxBuffer dst = (CxBuffer) malloc(sizeof(cx_buffer_s));
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82 if (dst) {
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83 dst->bytes = malloc(length);
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84 if (!dst->bytes) {
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85 free(dst);
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86 return NULL;
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87 }
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88 dst->capacity = length;
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89 dst->size = length;
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90 dst->flags = flags | CX_BUFFER_FREE_CONTENTS;
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91 dst->pos = 0;
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92 memcpy(dst->bytes, src->bytes + start, length);
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93 }
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94 return dst;
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95 }
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96
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97 int cxBufferSeek(
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98 CxBuffer buffer,
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99 off_t offset,
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100 int whence
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101 ) {
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102 size_t npos;
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103 switch (whence) {
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104 case SEEK_CUR:
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105 npos = buffer->pos;
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106 break;
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107 case SEEK_END:
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108 npos = buffer->size;
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109 break;
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110 case SEEK_SET:
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111 npos = 0;
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112 break;
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113 default:
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114 return -1;
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115 }
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116
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117 size_t opos = npos;
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118 npos += offset;
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119
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120 if ((offset > 0 && npos < opos) || (offset < 0 && npos > opos)) {
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121 return -1;
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122 }
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123
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124 if (npos >= buffer->size) {
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125 return -1;
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126 } else {
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127 buffer->pos = npos;
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128 return 0;
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129 }
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130
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131 }
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132
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133 int cxBufferEof(CxBuffer buffer) {
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134 return buffer->pos >= buffer->size;
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135 }
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136
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137 int cxBufferMinimumCapacity(
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138 CxBuffer buffer,
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139 size_t additional_bytes
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140 ) {
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141 size_t newcap = buffer->capacity + additional_bytes;
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142
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143 // overflow protection
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144 if (newcap < buffer->capacity) {
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145 return -1;
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146 }
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147
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148 unsigned char *newspace = realloc(buffer->bytes, newcap);
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149 if (newspace) {
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150 memset(newspace + buffer->size, 0, newcap - buffer->size);
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151 buffer->bytes = newspace;
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152 buffer->capacity = newcap;
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153 } else {
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154 return -1;
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155 }
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156
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157 return 0;
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158 }
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159
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160 size_t cxBufferWrite(
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161 void const *ptr,
483
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parents:
diff changeset
162 size_t size,
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parents:
diff changeset
163 size_t nitems,
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
164 CxBuffer buffer
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
165 ) {
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
166 size_t len;
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parents:
diff changeset
167 if (cx_szmul(size, nitems, &len)) {
929016224c3c add ported UCX buffer implementation
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diff changeset
168 return 0;
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
169 }
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diff changeset
170 size_t required = buffer->pos + len;
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diff changeset
171 if (buffer->pos > required) {
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parents:
diff changeset
172 return 0;
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
173 }
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parents:
diff changeset
174
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parents:
diff changeset
175 if (required > buffer->capacity) {
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parents:
diff changeset
176 if ((buffer->flags & CX_BUFFER_AUTO_EXTEND) == CX_BUFFER_AUTO_EXTEND) {
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parents:
diff changeset
177 if (cxBufferMinimumCapacity(buffer, required)) {
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178 return 0;
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
179 }
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parents:
diff changeset
180 } else {
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181 len = buffer->capacity - buffer->pos;
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parents:
diff changeset
182 if (size > 1) {
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diff changeset
183 len -= len % size;
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parents:
diff changeset
184 }
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parents:
diff changeset
185 }
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parents:
diff changeset
186 }
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parents:
diff changeset
187
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parents:
diff changeset
188 if (len == 0) {
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189 return len;
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parents:
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190 }
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parents:
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191
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192 memcpy(buffer->bytes + buffer->pos, ptr, len);
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193 buffer->pos += len;
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194 if (buffer->pos > buffer->size) {
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195 buffer->size = buffer->pos;
929016224c3c add ported UCX buffer implementation
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196 }
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197
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198 return len / size;
929016224c3c add ported UCX buffer implementation
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199 }
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200
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201 size_t cxBufferRead(
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diff changeset
202 void *ptr,
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parents:
diff changeset
203 size_t size,
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parents:
diff changeset
204 size_t nitems,
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parents:
diff changeset
205 CxBuffer buffer
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Mike Becker <universe@uap-core.de>
parents:
diff changeset
206 ) {
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diff changeset
207 size_t len;
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parents:
diff changeset
208 if (cx_szmul(size, nitems, &len)) {
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
209 return 0;
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
210 }
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
211 if (buffer->pos + len > buffer->size) {
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diff changeset
212 len = buffer->size - buffer->pos;
929016224c3c add ported UCX buffer implementation
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diff changeset
213 if (size > 1) len -= len % size;
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parents:
diff changeset
214 }
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
215
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
216 if (len <= 0) {
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
217 return len;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
218 }
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
219
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220 memcpy(ptr, buffer->bytes + buffer->pos, len);
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parents:
diff changeset
221 buffer->pos += len;
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
222
929016224c3c add ported UCX buffer implementation
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diff changeset
223 return len / size;
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parents:
diff changeset
224 }
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parents:
diff changeset
225
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parents:
diff changeset
226 int cxBufferPut(
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diff changeset
227 CxBuffer buffer,
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parents:
diff changeset
228 int c
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
229 ) {
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
230 if (buffer->pos >= buffer->capacity) {
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
231 if ((buffer->flags & CX_BUFFER_AUTO_EXTEND) == CX_BUFFER_AUTO_EXTEND) {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
232 if (cxBufferMinimumCapacity(buffer, buffer->capacity + 1)) {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
233 return EOF;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
234 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
235 } else {
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
236 return EOF;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
237 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
238 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
239
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parents:
diff changeset
240 c &= 0xFF;
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parents:
diff changeset
241 buffer->bytes[buffer->pos] = (unsigned char) c;
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
242 buffer->pos++;
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
243 if (buffer->pos > buffer->size) {
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
244 buffer->size = buffer->pos;
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
245 }
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parents:
diff changeset
246 return c;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
247 }
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parents:
diff changeset
248
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parents:
diff changeset
249 int cxBufferGet(CxBuffer buffer) {
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parents:
diff changeset
250 if (cxBufferEof(buffer)) {
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
251 return EOF;
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
252 } else {
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
253 int c = buffer->bytes[buffer->pos];
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parents:
diff changeset
254 buffer->pos++;
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
255 return c;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
256 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
257 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
258
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
259 size_t cxBufferPutString(
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
260 CxBuffer buffer,
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
261 const char *str
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
262 ) {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
263 return cxBufferWrite(str, 1, strlen(str), buffer);
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
264 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
265
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
266 int cxBufferShiftLeft(
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
267 CxBuffer buffer,
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
268 size_t shift
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
269 ) {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
270 if (shift >= buffer->size) {
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
271 buffer->pos = buffer->size = 0;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
272 } else {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
273 memmove(buffer->bytes, buffer->bytes + shift, buffer->size - shift);
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
274 buffer->size -= shift;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
275
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
276 if (buffer->pos >= shift) {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
277 buffer->pos -= shift;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
278 } else {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
279 buffer->pos = 0;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
280 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
281 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
282 return 0;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
283 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
284
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
285 int cxBufferShiftRight(
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
286 CxBuffer buffer,
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
287 size_t shift
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
288 ) {
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
289 size_t req_capacity = buffer->size + shift;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
290 size_t movebytes;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
291
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
292 // auto extend buffer, if required and enabled
929016224c3c add ported UCX buffer implementation
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parents:
diff changeset
293 if (buffer->capacity < req_capacity) {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
294 if ((buffer->flags & CX_BUFFER_AUTO_EXTEND) == CX_BUFFER_AUTO_EXTEND) {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
295 if (cxBufferMinimumCapacity(buffer, req_capacity)) {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
296 return 1;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
297 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
298 movebytes = buffer->size;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
299 } else {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
300 movebytes = buffer->capacity - shift;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
301 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
302 } else {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
303 movebytes = buffer->size;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
304 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
305
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
306 memmove(buffer->bytes + shift, buffer->bytes, movebytes);
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
307 buffer->size = shift + movebytes;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
308
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
309 buffer->pos += shift;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
310 if (buffer->pos > buffer->size) {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
311 buffer->pos = buffer->size;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
312 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
313
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
314 return 0;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
315 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
316
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
317 int cxBufferShift(
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
318 CxBuffer buffer,
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
319 off_t shift
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
320 ) {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
321 if (shift < 0) {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
322 return cxBufferShiftLeft(buffer, (size_t) (-shift));
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
323 } else if (shift > 0) {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
324 return cxBufferShiftRight(buffer, (size_t) shift);
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
325 } else {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
326 return 0;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
327 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
328 }

mercurial