ucx/buffer.c

Thu, 15 May 2014 20:06:28 +0200

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Thu, 15 May 2014 20:06:28 +0200
changeset 39
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parent 0
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child 124
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permissions
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added table view (Motif)

0
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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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Olaf Wintermann <olaf.wintermann@gmail.com>
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3 *
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Olaf Wintermann <olaf.wintermann@gmail.com>
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4 * Copyright 2013 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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Olaf Wintermann <olaf.wintermann@gmail.com>
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9 * 1. Redistributions of source code must retain the above copyright
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Olaf Wintermann <olaf.wintermann@gmail.com>
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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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Olaf Wintermann <olaf.wintermann@gmail.com>
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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 size, 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(size);
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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, size);
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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 = size;
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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 if(src->size == 0) {
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68 return NULL;
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69 }
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70 if (length == 0) {
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71 length = src->size - start;
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72 }
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73 if (start+length > src->size) {
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74 return NULL;
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75 }
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76
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77 UcxBuffer *dst = (UcxBuffer*) malloc(sizeof(UcxBuffer));
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78 if (dst) {
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79 dst->space = (char*)malloc(length);
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80 if (!dst->space) {
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81 free(dst);
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82 return NULL;
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83 }
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84 dst->capacity = length;
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85 dst->size = length;
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86 dst->flags = flags | UCX_BUFFER_AUTOFREE;
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87 dst->pos = 0;
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88 memcpy(dst->space, src->space+start, length);
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89 }
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90 return dst;
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91 }
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92
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93 int ucx_buffer_seek(UcxBuffer *buffer, off_t offset, int whence) {
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94 size_t npos;
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95 switch (whence) {
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96 case SEEK_CUR:
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97 npos = buffer->pos;
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98 break;
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99 case SEEK_END:
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100 npos = buffer->size;
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101 break;
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102 default:
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103 npos = 0;
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104 }
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105
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106 npos += offset;
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107
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108 if (npos > buffer->size) {
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109 return -1;
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110 } else {
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111 buffer->pos = npos;
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112 return 0;
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113 }
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114
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115 }
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116
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117 int ucx_buffer_eof(UcxBuffer *buffer) {
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118 return buffer->pos >= buffer->size;
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119 }
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120
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121 int ucx_buffer_extend(UcxBuffer *buffer, size_t len) {
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122 size_t newcap = buffer->capacity;
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123 while (buffer->pos + len > newcap) newcap <<= 1;
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124
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125 char *newspace = (char*)realloc(buffer->space, newcap);
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126 if (newspace) {
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127 memset(newspace+buffer->size, 0, newcap-buffer->size);
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128 buffer->space = newspace;
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129 buffer->capacity = newcap;
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130 } else {
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131 return -1;
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132 }
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133
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134 return 0;
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135 }
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136
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137 size_t ucx_buffer_write(const void *ptr, size_t size, size_t nitems,
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138 UcxBuffer *buffer) {
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139 size_t len = size * nitems;
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140 if (buffer->pos + len > buffer->capacity) {
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141 if ((buffer->flags & UCX_BUFFER_AUTOEXTEND) == UCX_BUFFER_AUTOEXTEND) {
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142 if(ucx_buffer_extend(buffer, len)) {
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143 return -1;
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144 }
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145 } else {
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146 len = buffer->capacity - buffer->pos;
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147 if (size > 1) len -= len%size;
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148 }
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149 }
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150
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151 if (len <= 0) {
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152 return len;
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153 }
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154
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155 memcpy(buffer->space + buffer->pos, ptr, len);
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156 buffer->pos += len;
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157 if(buffer->pos > buffer->size) {
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158 buffer->size = buffer->pos;
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159 }
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160
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161 return len / size;
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162 }
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163
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164 size_t ucx_buffer_read(void *ptr, size_t size, size_t nitems,
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165 UcxBuffer *buffer) {
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166 size_t len = size * nitems;
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167 if (buffer->pos + len > buffer->size) {
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168 len = buffer->size - buffer->pos;
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169 if (size > 1) len -= len%size;
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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(ptr, buffer->space + buffer->pos, len);
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177 buffer->pos += len;
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178
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179 return len / size;
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180 }
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181
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182 int ucx_buffer_putc(UcxBuffer *buffer, int c) {
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183 if(buffer->pos >= buffer->capacity) {
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184 if ((buffer->flags & UCX_BUFFER_AUTOEXTEND) == UCX_BUFFER_AUTOEXTEND) {
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185 if(ucx_buffer_extend(buffer, 1)) {
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186 return EOF;
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187 }
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188 } else {
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189 return EOF;
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190 }
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191 }
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192
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193 c &= 0xFF;
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194 buffer->space[buffer->pos] = (char) c;
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195 buffer->pos++;
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196 if(buffer->pos > buffer->size) {
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197 buffer->size = buffer->pos;
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198 }
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199 return c;
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200 }
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201
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202 int ucx_buffer_getc(UcxBuffer *buffer) {
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203 if (ucx_buffer_eof(buffer)) {
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204 return EOF;
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205 } else {
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206 int c = buffer->space[buffer->pos];
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207 buffer->pos++;
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208 return c;
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209 }
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210 }
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211
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212 size_t ucx_buffer_puts(UcxBuffer *buffer, char *str) {
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213 return ucx_buffer_write((const void*)str, 1, strlen(str), buffer);
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214 }

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