src/ucx/buffer.c

Thu, 10 Nov 2016 18:44:48 +0100

author
Mike Becker <universe@uap-core.de>
date
Thu, 10 Nov 2016 18:44:48 +0100
changeset 60
9f25df78925e
parent 39
ac35daceb24c
permissions
-rw-r--r--

removes span around line number

39
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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 2015 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
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
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131 while (buffer->capacity + len > newcap) {
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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132 newcap <<= 1;
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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133 if (newcap < buffer->capacity) {
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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134 return -1;
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
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135 }
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
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136 }
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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137
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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138 char *newspace = (char*)realloc(buffer->space, newcap);
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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139 if (newspace) {
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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140 memset(newspace+buffer->size, 0, newcap-buffer->size);
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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141 buffer->space = newspace;
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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142 buffer->capacity = newcap;
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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143 } else {
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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144 return -1;
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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145 }
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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146
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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147 return 0;
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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148 }
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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149
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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diff changeset
150 size_t ucx_buffer_write(const void *ptr, size_t size, size_t nitems,
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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151 UcxBuffer *buffer) {
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152 size_t len = size * nitems;
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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153 size_t required = buffer->pos + len;
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154 if (buffer->pos > required) {
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155 return 0;
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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156 }
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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157
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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158 if (required > buffer->capacity) {
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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diff changeset
159 if ((buffer->flags & UCX_BUFFER_AUTOEXTEND) == UCX_BUFFER_AUTOEXTEND) {
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
diff changeset
160 if (ucx_buffer_extend(buffer, required - buffer->capacity)) {
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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161 return 0;
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162 }
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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163 } else {
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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diff changeset
164 len = buffer->capacity - buffer->pos;
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165 if (size > 1) {
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diff changeset
166 len -= len%size;
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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167 }
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
diff changeset
168 }
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
Mike Becker <universe@uap-core.de>
parents:
diff changeset
169 }
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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170
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
diff changeset
171 if (len == 0) {
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
diff changeset
172 return len;
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
diff changeset
173 }
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
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174
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parents:
diff changeset
175 memcpy(buffer->space + buffer->pos, ptr, len);
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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176 buffer->pos += len;
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
diff changeset
177 if(buffer->pos > buffer->size) {
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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diff changeset
178 buffer->size = buffer->pos;
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parents:
diff changeset
179 }
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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180
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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181 return len / size;
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
diff changeset
182 }
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
diff changeset
183
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
diff changeset
184 size_t ucx_buffer_read(void *ptr, size_t size, size_t nitems,
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
diff changeset
185 UcxBuffer *buffer) {
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
diff changeset
186 size_t len = size * nitems;
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
diff changeset
187 if (buffer->pos + len > buffer->size) {
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
diff changeset
188 len = buffer->size - buffer->pos;
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
diff changeset
189 if (size > 1) len -= len%size;
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parents:
diff changeset
190 }
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
diff changeset
191
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
diff changeset
192 if (len <= 0) {
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
diff changeset
193 return len;
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
diff changeset
194 }
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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diff changeset
195
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
diff changeset
196 memcpy(ptr, buffer->space + buffer->pos, len);
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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diff changeset
197 buffer->pos += len;
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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diff changeset
198
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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diff changeset
199 return len / size;
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
diff changeset
200 }
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
diff changeset
201
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
diff changeset
202 int ucx_buffer_putc(UcxBuffer *buffer, int c) {
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
diff changeset
203 if(buffer->pos >= buffer->capacity) {
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
diff changeset
204 if ((buffer->flags & UCX_BUFFER_AUTOEXTEND) == UCX_BUFFER_AUTOEXTEND) {
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
diff changeset
205 if(ucx_buffer_extend(buffer, 1)) {
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
diff changeset
206 return EOF;
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
Mike Becker <universe@uap-core.de>
parents:
diff changeset
207 }
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
Mike Becker <universe@uap-core.de>
parents:
diff changeset
208 } else {
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
Mike Becker <universe@uap-core.de>
parents:
diff changeset
209 return EOF;
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
Mike Becker <universe@uap-core.de>
parents:
diff changeset
210 }
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
Mike Becker <universe@uap-core.de>
parents:
diff changeset
211 }
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
Mike Becker <universe@uap-core.de>
parents:
diff changeset
212
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
Mike Becker <universe@uap-core.de>
parents:
diff changeset
213 c &= 0xFF;
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
Mike Becker <universe@uap-core.de>
parents:
diff changeset
214 buffer->space[buffer->pos] = (char) c;
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
Mike Becker <universe@uap-core.de>
parents:
diff changeset
215 buffer->pos++;
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
Mike Becker <universe@uap-core.de>
parents:
diff changeset
216 if(buffer->pos > buffer->size) {
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
diff changeset
217 buffer->size = buffer->pos;
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
Mike Becker <universe@uap-core.de>
parents:
diff changeset
218 }
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
Mike Becker <universe@uap-core.de>
parents:
diff changeset
219 return c;
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
Mike Becker <universe@uap-core.de>
parents:
diff changeset
220 }
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
Mike Becker <universe@uap-core.de>
parents:
diff changeset
221
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
Mike Becker <universe@uap-core.de>
parents:
diff changeset
222 int ucx_buffer_getc(UcxBuffer *buffer) {
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
Mike Becker <universe@uap-core.de>
parents:
diff changeset
223 if (ucx_buffer_eof(buffer)) {
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
Mike Becker <universe@uap-core.de>
parents:
diff changeset
224 return EOF;
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
Mike Becker <universe@uap-core.de>
parents:
diff changeset
225 } else {
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
Mike Becker <universe@uap-core.de>
parents:
diff changeset
226 int c = buffer->space[buffer->pos];
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
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parents:
diff changeset
227 buffer->pos++;
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
Mike Becker <universe@uap-core.de>
parents:
diff changeset
228 return c;
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
Mike Becker <universe@uap-core.de>
parents:
diff changeset
229 }
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
Mike Becker <universe@uap-core.de>
parents:
diff changeset
230 }
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
Mike Becker <universe@uap-core.de>
parents:
diff changeset
231
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
Mike Becker <universe@uap-core.de>
parents:
diff changeset
232 size_t ucx_buffer_puts(UcxBuffer *buffer, char *str) {
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
Mike Becker <universe@uap-core.de>
parents:
diff changeset
233 return ucx_buffer_write((const void*)str, 1, strlen(str), buffer);
ac35daceb24c adds UCX + changes how the input file is read (uses an consecutive memory area now)
Mike Becker <universe@uap-core.de>
parents:
diff changeset
234 }

mercurial