src/buffer.c

Thu, 07 Nov 2019 10:10:36 +0100

author
Mike Becker <universe@uap-core.de>
date
Thu, 07 Nov 2019 10:10:36 +0100
changeset 369
28a8ccc442b0
parent 290
d5d6ab809ad3
permissions
-rw-r--r--

removes some bugs by redesigning the array API

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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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2f5dea574a75 modules documentation
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4 * Copyright 2017 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 "ucx/buffer.h"
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30
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31 #include <stdarg.h>
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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 UcxBuffer *ucx_buffer_new(void *space, size_t capacity, int flags) {
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36 UcxBuffer *buffer = (UcxBuffer*) malloc(sizeof(UcxBuffer));
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37 if (buffer) {
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38 buffer->flags = flags;
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39 if (!space) {
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40 buffer->space = (char*)malloc(capacity);
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41 if (!buffer->space) {
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42 free(buffer);
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43 return NULL;
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44 }
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45 memset(buffer->space, 0, capacity);
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46 buffer->flags |= UCX_BUFFER_AUTOFREE;
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47 } else {
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48 buffer->space = (char*)space;
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49 }
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50 buffer->capacity = capacity;
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51 buffer->size = 0;
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52
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53 buffer->pos = 0;
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54 }
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55
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56 return buffer;
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57 }
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58
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59 void ucx_buffer_free(UcxBuffer *buffer) {
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60 if ((buffer->flags & UCX_BUFFER_AUTOFREE) == UCX_BUFFER_AUTOFREE) {
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61 free(buffer->space);
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62 }
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63 free(buffer);
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64 }
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65
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66 UcxBuffer* ucx_buffer_extract(
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67 UcxBuffer *src, size_t start, size_t length, int flags) {
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68 if (src->size == 0 || length == 0 ||
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69 ((size_t)-1) - start < length || start+length > src->capacity)
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70 {
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71 return NULL;
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72 }
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73
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74 UcxBuffer *dst = (UcxBuffer*) malloc(sizeof(UcxBuffer));
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75 if (dst) {
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76 dst->space = (char*)malloc(length);
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77 if (!dst->space) {
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78 free(dst);
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79 return NULL;
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80 }
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81 dst->capacity = length;
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82 dst->size = length;
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83 dst->flags = flags | UCX_BUFFER_AUTOFREE;
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84 dst->pos = 0;
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85 memcpy(dst->space, src->space+start, length);
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86 }
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87 return dst;
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88 }
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89
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90 int ucx_buffer_seek(UcxBuffer *buffer, off_t offset, int whence) {
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91 size_t npos;
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92 switch (whence) {
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93 case SEEK_CUR:
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94 npos = buffer->pos;
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95 break;
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96 case SEEK_END:
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97 npos = buffer->size;
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98 break;
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99 case SEEK_SET:
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100 npos = 0;
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101 break;
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102 default:
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103 return -1;
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104 }
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105
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106 size_t opos = npos;
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107 npos += offset;
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108
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109 if ((offset > 0 && npos < opos) || (offset < 0 && npos > opos)) {
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110 return -1;
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111 }
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112
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113 if (npos >= buffer->size) {
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114 return -1;
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115 } else {
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116 buffer->pos = npos;
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117 return 0;
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118 }
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120 }
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121
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122 int ucx_buffer_eof(UcxBuffer *buffer) {
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123 return buffer->pos >= buffer->size;
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124 }
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125
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126 int ucx_buffer_extend(UcxBuffer *buffer, size_t len) {
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127 size_t newcap = buffer->capacity;
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128
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129 if (buffer->capacity + len < buffer->capacity) {
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130 return -1;
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131 }
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132
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133 while (buffer->capacity + len > newcap) {
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134 newcap <<= 1;
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135 if (newcap < buffer->capacity) {
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136 return -1;
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137 }
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138 }
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139
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140 char *newspace = (char*)realloc(buffer->space, newcap);
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141 if (newspace) {
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142 memset(newspace+buffer->size, 0, newcap-buffer->size);
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143 buffer->space = newspace;
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144 buffer->capacity = newcap;
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145 } else {
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146 return -1;
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147 }
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148
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149 return 0;
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150 }
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151
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152 size_t ucx_buffer_write(const void *ptr, size_t size, size_t nitems,
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153 UcxBuffer *buffer) {
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diff changeset
154 size_t len;
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diff changeset
155 if(ucx_szmul(size, nitems, &len)) {
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diff changeset
156 return 0;
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diff changeset
157 }
169
279dd3ca7a77 fixed issues revealed by buffer tests
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diff changeset
158 size_t required = buffer->pos + len;
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diff changeset
159 if (buffer->pos > required) {
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diff changeset
160 return 0;
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parents: 140
diff changeset
161 }
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parents: 140
diff changeset
162
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parents: 140
diff changeset
163 if (required > buffer->capacity) {
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164 if ((buffer->flags & UCX_BUFFER_AUTOEXTEND) == UCX_BUFFER_AUTOEXTEND) {
169
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parents: 140
diff changeset
165 if (ucx_buffer_extend(buffer, required - buffer->capacity)) {
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diff changeset
166 return 0;
64
16590c9c497c added autoextend feature to buffer
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parents: 63
diff changeset
167 }
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diff changeset
168 } else {
76
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diff changeset
169 len = buffer->capacity - buffer->pos;
169
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diff changeset
170 if (size > 1) {
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diff changeset
171 len -= len%size;
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172 }
64
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173 }
56
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174 }
76
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175
169
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diff changeset
176 if (len == 0) {
64
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177 return len;
56
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178 }
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179
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180 memcpy(buffer->space + buffer->pos, ptr, len);
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181 buffer->pos += len;
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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
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186 return len / size;
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diff changeset
187 }
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188
76
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diff changeset
189 size_t ucx_buffer_read(void *ptr, size_t size, size_t nitems,
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190 UcxBuffer *buffer) {
270
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191 size_t len;
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192 if(ucx_szmul(size, nitems, &len)) {
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193 return 0;
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194 }
76
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195 if (buffer->pos + len > buffer->size) {
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196 len = buffer->size - buffer->pos;
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197 if (size > 1) len -= len%size;
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198 }
76
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199
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diff changeset
200 if (len <= 0) {
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diff changeset
201 return len;
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diff changeset
202 }
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203
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diff changeset
204 memcpy(ptr, buffer->space + buffer->pos, len);
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205 buffer->pos += len;
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206
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diff changeset
207 return len / size;
56
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208 }
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209
60
abae4669fba7 renamed UcxMemstream to UcxBuffer
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diff changeset
210 int ucx_buffer_putc(UcxBuffer *buffer, int c) {
76
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diff changeset
211 if(buffer->pos >= buffer->capacity) {
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diff changeset
212 if ((buffer->flags & UCX_BUFFER_AUTOEXTEND) == UCX_BUFFER_AUTOEXTEND) {
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diff changeset
213 if(ucx_buffer_extend(buffer, 1)) {
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diff changeset
214 return EOF;
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diff changeset
215 }
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diff changeset
216 } else {
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diff changeset
217 return EOF;
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diff changeset
218 }
56
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219 }
76
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diff changeset
220
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diff changeset
221 c &= 0xFF;
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diff changeset
222 buffer->space[buffer->pos] = (char) c;
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diff changeset
223 buffer->pos++;
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diff changeset
224 if(buffer->pos > buffer->size) {
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diff changeset
225 buffer->size = buffer->pos;
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diff changeset
226 }
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diff changeset
227 return c;
56
76caac0da4a0 added memstream to ucx - still little work to do
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parents:
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228 }
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diff changeset
229
60
abae4669fba7 renamed UcxMemstream to UcxBuffer
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parents: 58
diff changeset
230 int ucx_buffer_getc(UcxBuffer *buffer) {
abae4669fba7 renamed UcxMemstream to UcxBuffer
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parents: 58
diff changeset
231 if (ucx_buffer_eof(buffer)) {
56
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parents:
diff changeset
232 return EOF;
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parents:
diff changeset
233 } else {
269
591473851c95 ucx_buffere_getc should return an unsigned char (0-255) or EOF (-1)
Olaf Wintermann <olaf.wintermann@gmail.com>
parents: 259
diff changeset
234 int c = ((unsigned char*)buffer->space)[buffer->pos];
60
abae4669fba7 renamed UcxMemstream to UcxBuffer
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parents: 58
diff changeset
235 buffer->pos++;
56
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parents:
diff changeset
236 return c;
76caac0da4a0 added memstream to ucx - still little work to do
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parents:
diff changeset
237 }
76caac0da4a0 added memstream to ucx - still little work to do
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parents:
diff changeset
238 }
76
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diff changeset
239
290
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
240 size_t ucx_buffer_puts(UcxBuffer *buffer, const char *str) {
140
15f871f50bfd completed documentation + changed API for buffer/stream generic copy functions
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parents: 103
diff changeset
241 return ucx_buffer_write((const void*)str, 1, strlen(str), buffer);
76
655020a30e77 fixed buffer
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diff changeset
242 }
290
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
243
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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diff changeset
244 int ucx_buffer_shift_left(UcxBuffer* buffer, size_t shift) {
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
245 if (shift >= buffer->size) {
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
246 buffer->pos = buffer->size = 0;
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parents: 270
diff changeset
247 } else {
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
248 memmove(buffer->space, buffer->space + shift, buffer->size - shift);
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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diff changeset
249 buffer->size -= shift;
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parents: 270
diff changeset
250
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
251 if (buffer->pos >= shift) {
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
252 buffer->pos -= shift;
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
253 } else {
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
254 buffer->pos = 0;
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
255 }
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
256 }
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
257 return 0;
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
258 }
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
259
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
260 int ucx_buffer_shift_right(UcxBuffer* buffer, size_t shift) {
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
261 size_t req_capacity = buffer->size + shift;
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
262 size_t movebytes;
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
263
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
264 // auto extend buffer, if required and enabled
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
265 if (buffer->capacity < req_capacity) {
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
266 if ((buffer->flags & UCX_BUFFER_AUTOEXTEND) == UCX_BUFFER_AUTOEXTEND) {
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
267 if (ucx_buffer_extend(buffer, req_capacity - buffer->capacity)) {
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
268 return 1;
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
Mike Becker <universe@uap-core.de>
parents: 270
diff changeset
269 }
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
270 movebytes = buffer->size;
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
271 } else {
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
272 movebytes = buffer->capacity - shift;
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
273 }
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
274 } else {
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
275 movebytes = buffer->size;
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
276 }
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
277
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
278 memmove(buffer->space + shift, buffer->space, movebytes);
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
279 buffer->size = shift+movebytes;
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
280
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
281 buffer->pos += shift;
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
282 if (buffer->pos > buffer->size) {
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parents: 270
diff changeset
283 buffer->pos = buffer->size;
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parents: 270
diff changeset
284 }
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
285
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
286 return 0;
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
287 }
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
288
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
289 int ucx_buffer_shift(UcxBuffer* buffer, off_t shift) {
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parents: 270
diff changeset
290 if (shift < 0) {
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parents: 270
diff changeset
291 return ucx_buffer_shift_left(buffer, (size_t) (-shift));
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
292 } else if (shift > 0) {
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
293 return ucx_buffer_shift_right(buffer, (size_t) shift);
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parents: 270
diff changeset
294 } else {
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
295 return 0;
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
296 }
d5d6ab809ad3 adds new shift operations for UcxBuffer (including tests and a usage example in modules.md)
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parents: 270
diff changeset
297 }

mercurial