ucx/buffer.c

Tue, 12 Dec 2017 23:58:54 +0100

author
Mike Becker <universe@uap-core.de>
date
Tue, 12 Dec 2017 23:58:54 +0100
branch
v1.1
changeset 343
b9c6e0be5774
parent 308
82275f589d8d
child 335
c1bc13faadaa
permissions
-rw-r--r--

fixes infinite loop when trying to overwrite a collection with a regular file

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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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bf19378aed58 updates UCX to version 0.11
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4 * Copyright 2016 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 "buffer.h"
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30 #include <stdarg.h>
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31 #include <stdlib.h>
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32 #include <string.h>
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33
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34 UcxBuffer *ucx_buffer_new(void *space, size_t capacity, int flags) {
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35 UcxBuffer *buffer = (UcxBuffer*) malloc(sizeof(UcxBuffer));
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36 if (buffer) {
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37 buffer->flags = flags;
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38 if (!space) {
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39 buffer->space = (char*)malloc(capacity);
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40 if (!buffer->space) {
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41 free(buffer);
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42 return NULL;
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43 }
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44 memset(buffer->space, 0, capacity);
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45 buffer->flags |= UCX_BUFFER_AUTOFREE;
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46 } else {
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47 buffer->space = (char*)space;
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48 }
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49 buffer->capacity = capacity;
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50 buffer->size = 0;
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51
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52 buffer->pos = 0;
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53 }
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54
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55 return buffer;
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56 }
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57
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58 void ucx_buffer_free(UcxBuffer *buffer) {
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59 if ((buffer->flags & UCX_BUFFER_AUTOFREE) == UCX_BUFFER_AUTOFREE) {
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60 free(buffer->space);
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61 }
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62 free(buffer);
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63 }
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64
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65 UcxBuffer* ucx_buffer_extract(
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66 UcxBuffer *src, size_t start, size_t length, int flags) {
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67
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68 if (src->size == 0 || length == 0 || start+length > src->capacity) {
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69 return NULL;
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70 }
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71
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72 UcxBuffer *dst = (UcxBuffer*) malloc(sizeof(UcxBuffer));
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73 if (dst) {
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74 dst->space = (char*)malloc(length);
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75 if (!dst->space) {
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76 free(dst);
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77 return NULL;
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78 }
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79 dst->capacity = length;
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80 dst->size = length;
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81 dst->flags = flags | UCX_BUFFER_AUTOFREE;
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82 dst->pos = 0;
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83 memcpy(dst->space, src->space+start, length);
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84 }
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85 return dst;
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86 }
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87
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88 int ucx_buffer_seek(UcxBuffer *buffer, off_t offset, int whence) {
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89 size_t npos;
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90 switch (whence) {
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91 case SEEK_CUR:
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92 npos = buffer->pos;
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93 break;
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94 case SEEK_END:
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95 npos = buffer->size;
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96 break;
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97 case SEEK_SET:
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98 npos = 0;
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99 break;
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100 default:
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101 return -1;
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102 }
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103
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104 size_t opos = npos;
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105 npos += offset;
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106
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107 if ((offset > 0 && npos < opos) || (offset < 0 && npos > opos)) {
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108 return -1;
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109 }
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110
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111 if (npos >= buffer->size) {
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112 return -1;
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113 } else {
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114 buffer->pos = npos;
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115 return 0;
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116 }
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117
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118 }
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119
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120 int ucx_buffer_eof(UcxBuffer *buffer) {
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121 return buffer->pos >= buffer->size;
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122 }
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123
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124 int ucx_buffer_extend(UcxBuffer *buffer, size_t len) {
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125 size_t newcap = buffer->capacity;
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126
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127 if (buffer->capacity + len < buffer->capacity) {
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128 return -1;
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129 }
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130
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131 while (buffer->capacity + len > newcap) {
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132 newcap <<= 1;
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133 if (newcap < buffer->capacity) {
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134 return -1;
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135 }
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136 }
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137
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138 char *newspace = (char*)realloc(buffer->space, newcap);
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139 if (newspace) {
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140 memset(newspace+buffer->size, 0, newcap-buffer->size);
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141 buffer->space = newspace;
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142 buffer->capacity = newcap;
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143 } else {
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144 return -1;
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145 }
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146
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147 return 0;
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148 }
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149
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150 size_t ucx_buffer_write(const void *ptr, size_t size, size_t nitems,
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151 UcxBuffer *buffer) {
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152 size_t len = size * nitems;
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153 const char *string = ptr;
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154 size_t required = buffer->pos + len;
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155 if (buffer->pos > required) {
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156 return 0;
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157 }
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158
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159 if (required > buffer->capacity) {
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160 if ((buffer->flags & UCX_BUFFER_AUTOEXTEND) == UCX_BUFFER_AUTOEXTEND) {
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161 if (ucx_buffer_extend(buffer, required - buffer->capacity)) {
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162 return 0;
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163 }
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164 } else {
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165 len = buffer->capacity - buffer->pos;
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166 if (size > 1) {
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167 len -= len%size;
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168 }
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169 }
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170 }
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171
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172 if (len == 0) {
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173 return len;
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174 }
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175
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176 memcpy(buffer->space + buffer->pos, ptr, len);
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177 buffer->pos += len;
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178 if(buffer->pos > buffer->size) {
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179 buffer->size = buffer->pos;
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180 }
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181
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182 return len / size;
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183 }
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184
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185 size_t ucx_buffer_read(void *ptr, size_t size, size_t nitems,
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186 UcxBuffer *buffer) {
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187 size_t len = size * nitems;
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188 if (buffer->pos + len > buffer->size) {
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189 len = buffer->size - buffer->pos;
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190 if (size > 1) len -= len%size;
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191 }
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192
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193 if (len <= 0) {
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194 return len;
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195 }
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196
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197 memcpy(ptr, buffer->space + buffer->pos, len);
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198 buffer->pos += len;
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199
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200 return len / size;
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201 }
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202
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203 int ucx_buffer_putc(UcxBuffer *buffer, int c) {
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204 if(buffer->pos >= buffer->capacity) {
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205 if ((buffer->flags & UCX_BUFFER_AUTOEXTEND) == UCX_BUFFER_AUTOEXTEND) {
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206 if(ucx_buffer_extend(buffer, 1)) {
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207 return EOF;
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208 }
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209 } else {
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210 return EOF;
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211 }
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212 }
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213
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214 c &= 0xFF;
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215 buffer->space[buffer->pos] = (char) c;
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216 buffer->pos++;
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217 if(buffer->pos > buffer->size) {
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218 buffer->size = buffer->pos;
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219 }
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220 return c;
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221 }
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222
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223 int ucx_buffer_getc(UcxBuffer *buffer) {
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224 if (ucx_buffer_eof(buffer)) {
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225 return EOF;
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226 } else {
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227 int c = buffer->space[buffer->pos];
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228 buffer->pos++;
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229 return c;
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230 }
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231 }
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232
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diff changeset
233 size_t ucx_buffer_puts(UcxBuffer *buffer, char *str) {
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diff changeset
234 return ucx_buffer_write((const void*)str, 1, strlen(str), buffer);
1
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235 }

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