src/cx/buffer.h

Mon, 16 May 2022 19:15:44 +0200

author
Mike Becker <universe@uap-core.de>
date
Mon, 16 May 2022 19:15:44 +0200
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#170 test buffer seek

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 */
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28
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29 /**
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30 * \file buffer.h
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31 *
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32 * \brief Advanced buffer implementation.
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33 *
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34 * Instances of CxBuffer can be used to read from or to write to like one
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35 * would do with a stream.
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36 *
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37 * Some features for convenient use of the buffer
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38 * can be enabled. See the documentation of the macro constants for more
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39 * information.
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40 *
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41 * \author Mike Becker
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42 * \author Olaf Wintermann
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43 * \version 3.0
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44 * \copyright 2-Clause BSD License
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45 */
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46
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47 #ifndef UCX_BUFFER_H
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48 #define UCX_BUFFER_H
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49
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50 #include "common.h"
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51 #include "allocator.h"
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52
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53 #ifdef __cplusplus
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54 extern "C" {
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55 #endif
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56
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57 /**
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58 * No buffer features enabled (all flags cleared).
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59 */
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60 #define CX_BUFFER_DEFAULT 0x00
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61
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62 /**
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63 * If this flag is enabled, the buffer will automatically free its contents when destroyed.
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64 */
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65 #define CX_BUFFER_FREE_CONTENTS 0x01
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66
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67 /**
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68 * If this flag is enabled, the buffer will automatically extends its capacity.
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69 */
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70 #define CX_BUFFER_AUTO_EXTEND 0x02
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71
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72 /** Structure for the UCX buffer data. */
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73 typedef struct {
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74 /** A pointer to the buffer contents. */
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75 union {
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76 /**
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77 * Data is interpreted as text.
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78 */
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79 char *space;
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80 /**
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81 * Data is interpreted as binary.
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82 */
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83 unsigned char *bytes;
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84 };
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85 /** The allocator to use for automatic memory management. */
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86 CxAllocator const *allocator;
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87 /** Current position of the buffer. */
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88 size_t pos;
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89 /** Current capacity (i.e. maximum size) of the buffer. */
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90 size_t capacity;
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91 /** Current size of the buffer content. */
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92 size_t size;
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93 /**
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94 * The buffer may not extend beyond this threshold before starting to flush.
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95 * Default is \c SIZE_MAX (flushing disabled when auto extension is enabled).
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96 */
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97 size_t flush_threshold;
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98 /**
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99 * The block size for the elements to flush.
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100 * Default is 4096 bytes.
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101 */
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102 size_t flush_blksize;
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103 /**
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104 * The maximum number of blocks to flush in one cycle.
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105 * Zero disables flushing entirely (this is the default).
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106 * Set this to \c SIZE_MAX to flush the entire buffer.
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107 *
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108 * @attention if the maximum number of blocks multiplied with the block size
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109 * is smaller than the expected contents written to this buffer within one write
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110 * operation, multiple flush cycles are performed after that write.
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111 * That means the total number of blocks flushed after one write to this buffer may
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112 * be larger than \c flush_blkmax.
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113 */
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114 size_t flush_blkmax;
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115
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116 /**
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117 * The write function used for flushing.
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118 * If NULL, the flushed content gets discarded.
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119 */
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120 cx_write_func flush_func;
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121
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122 /**
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123 * The target for \c flush_func.
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124 */
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125 void *flush_target;
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126
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127 /**
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128 * Flag register for buffer features.
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129 * @see #CX_BUFFER_DEFAULT
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130 * @see #CX_BUFFER_FREE_CONTENTS
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131 * @see #CX_BUFFER_AUTO_EXTEND
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132 */
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133 int flags;
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134 } cx_buffer_s;
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135
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136 /**
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137 * UCX buffer.
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138 */
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139 typedef cx_buffer_s CxBuffer;
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140
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141 /**
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142 * Initializes a fresh buffer.
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143 *
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144 * \note You may provide \c NULL as argument for \p space.
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145 * Then this function will allocate the space and enforce
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146 * the #CX_BUFFER_FREE_CONTENTS flag.
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147 *
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148 * @param buffer the buffer to initialize
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149 * @param space pointer to the memory area, or \c NULL to allocate
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150 * new memory
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151 * @param capacity the capacity of the buffer
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152 * @param allocator the allocator this buffer shall use for automatic memory management
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153 * @param flags buffer features (see cx_buffer_s.flags)
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154 * @return zero on success, non-zero if a required allocation failed
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155 */
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156 __attribute__((__nonnull__(1, 4)))
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157 int cxBufferInit(
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158 CxBuffer *buffer,
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159 void *space,
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160 size_t capacity,
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161 CxAllocator const *allocator,
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162 int flags
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163 );
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164
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165 /**
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166 * Destroys the buffer contents.
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167 *
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168 * Has no effect if the #CX_BUFFER_FREE_CONTENTS feature is not enabled.
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169 *
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170 * @param buffer the buffer which contents shall be destroyed
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171 */
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172 __attribute__((__nonnull__))
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173 void cxBufferDestroy(CxBuffer *buffer);
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174
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175 /**
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176 * Shifts the contents of the buffer by the given offset.
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177 *
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178 * If the offset is positive, the contents are shifted to the right.
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179 * If auto extension is enabled, the buffer grows, if necessary.
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180 * In case the auto extension fails, this function returns a non-zero value and
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181 * no contents are changed.
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182 * If auto extension is disabled, the contents that do not fit into the buffer
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183 * are discarded.
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184 *
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185 * If the offset is negative, the contents are shifted to the left where the
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186 * first \p shift bytes are discarded.
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187 * The new size of the buffer is the old size minus the absolute shift value.
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188 * If this value is larger than the buffer size, the buffer is emptied (but
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189 * not cleared, see the security note below).
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190 *
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191 * The buffer position gets shifted alongside with the content but is kept
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192 * within the boundaries of the buffer.
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193 *
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194 * \note For situations where \c off_t is not large enough, there are specialized cxBufferShiftLeft() and
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195 * cxBufferShiftRight() functions using a \c size_t as parameter type.
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196 *
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197 * \attention
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198 * Security Note: The shifting operation does \em not erase the previously occupied memory cells.
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199 * But you can easily do that manually, e.g. by calling
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200 * <code>memset(buffer->bytes, 0, shift)</code> for a right shift or
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201 * <code>memset(buffer->bytes + buffer->size, 0, buffer->capacity - buffer->size)</code>
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202 * for a left shift.
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203 *
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204 * @param buffer the buffer
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205 * @param shift the shift offset (negative means left shift)
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206 * @return 0 on success, non-zero if a required auto-extension fails
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207 */
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208 __attribute__((__nonnull__))
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209 int cxBufferShift(
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210 CxBuffer *buffer,
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211 off_t shift
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212 );
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213
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214 /**
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215 * Shifts the buffer to the right.
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216 * See cxBufferShift() for details.
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217 *
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218 * @param buffer the buffer
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219 * @param shift the shift offset
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220 * @return 0 on success, non-zero if a required auto-extension fails
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221 * @see cxBufferShift()
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222 */
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223 __attribute__((__nonnull__))
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224 int cxBufferShiftRight(
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225 CxBuffer *buffer,
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226 size_t shift
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227 );
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228
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229 /**
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230 * Shifts the buffer to the left.
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231 * See cxBufferShift() for details.
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232 *
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233 * \note Since a left shift cannot fail due to memory allocation problems, this
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234 * function always returns zero.
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235 *
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236 * @param buffer the buffer
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237 * @param shift the positive shift offset
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238 * @return always zero
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239 * @see cxBufferShift()
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240 */
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241 __attribute__((__nonnull__))
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242 int cxBufferShiftLeft(
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243 CxBuffer *buffer,
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244 size_t shift
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245 );
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246
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247
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248 /**
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249 * Moves the position of the buffer.
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250 *
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251 * The new position is relative to the \p whence argument.
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252 *
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253 * \li \c SEEK_SET marks the start of the buffer.
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254 * \li \c SEEK_CUR marks the current position.
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255 * \li \c SEEK_END marks the end of the buffer.
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256 *
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257 * With an offset of zero, this function sets the buffer position to zero
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258 * (\c SEEK_SET), the buffer size (\c SEEK_END) or leaves the buffer position
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259 * unchanged (\c SEEK_CUR).
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260 *
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261 * @param buffer the buffer
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262 * @param offset position offset relative to \p whence
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263 * @param whence one of \c SEEK_SET, \c SEEK_CUR or \c SEEK_END
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264 * @return 0 on success, non-zero if the position is invalid
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265 *
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266 */
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267 __attribute__((__nonnull__))
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268 int cxBufferSeek(
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269 CxBuffer *buffer,
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270 off_t offset,
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271 int whence
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272 );
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273
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274 /**
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275 * Clears the buffer by resetting the position and deleting the data.
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276 *
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277 * The data is deleted by zeroing it with a call to memset().
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278 *
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279 * @param buffer the buffer to be cleared
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280 */
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281 __attribute__((__nonnull__))
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282 void cxBufferClear(CxBuffer *buffer);
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283
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284 /**
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285 * Tests, if the buffer position has exceeded the buffer capacity.
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286 *
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287 * @param buffer the buffer to test
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288 * @return non-zero, if the current buffer position has exceeded the last
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289 * available byte of the buffer.
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290 */
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291 __attribute__((__nonnull__))
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292 int cxBufferEof(CxBuffer const *buffer);
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293
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294
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295 /**
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296 * Ensures that the buffer has a minimum capacity.
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297 *
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298 * If the current capacity is not sufficient, the buffer will be extended.
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299 *
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300 * @param buffer the buffer
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301 * @param capacity the minimum required capacity for this buffer
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302 * @return 0 on success or a non-zero value on failure
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303 */
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304 __attribute__((__nonnull__))
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305 int cxBufferMinimumCapacity(
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306 CxBuffer *buffer,
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307 size_t capacity
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308 );
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309
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310 /**
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311 * Writes data to a CxBuffer.
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312 *
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313 * The position of the buffer is increased by the number of bytes written.
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314 *
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315 * \note The signature is compatible with the fwrite() family of functions.
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316 *
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317 * @param ptr a pointer to the memory area containing the bytes to be written
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318 * @param size the length of one element
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319 * @param nitems the element count
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320 * @param buffer the CxBuffer to write to
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321 * @return the total count of elements written
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322 */
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323 __attribute__((__nonnull__))
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324 size_t cxBufferWrite(
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325 void const *ptr,
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326 size_t size,
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327 size_t nitems,
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328 CxBuffer *buffer
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329 );
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330
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331 /**
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332 * Reads data from a CxBuffer.
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333 *
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334 * The position of the buffer is increased by the number of bytes read.
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335 *
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336 * \note The signature is compatible with the fread() family of functions.
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337 *
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338 * @param ptr a pointer to the memory area where to store the read data
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339 * @param size the length of one element
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340 * @param nitems the element count
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341 * @param buffer the CxBuffer to read from
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342 * @return the total number of elements read
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343 */
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344 __attribute__((__nonnull__))
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345 size_t cxBufferRead(
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346 void *ptr,
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347 size_t size,
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348 size_t nitems,
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349 CxBuffer *buffer
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350 );
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351
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352 /**
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353 * Writes a character to a buffer.
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354 *
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355 * The least significant byte of the argument is written to the buffer. If the
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356 * end of the buffer is reached and #CX_BUFFER_AUTO_EXTEND feature is enabled,
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357 * the buffer capacity is extended by cxBufferMinimumCapacity(). If the feature is
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358 * disabled or buffer extension fails, \c EOF is returned.
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359 *
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360 * On successful write, the position of the buffer is increased.
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361 *
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362 * @param buffer the buffer to write to
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363 * @param c the character to write
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364 * @return the byte that has bean written or \c EOF when the end of the stream is
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365 * reached and automatic extension is not enabled or not possible
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366 */
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367 __attribute__((__nonnull__))
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368 int cxBufferPut(
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369 CxBuffer *buffer,
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370 int c
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371 );
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372
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373 /**
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374 * Writes a string to a buffer.
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375 *
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376 * @param buffer the buffer
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377 * @param str the zero-terminated string
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378 * @return the number of bytes written
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379 */
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380 __attribute__((__nonnull__))
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381 size_t cxBufferPutString(
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382 CxBuffer *buffer,
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383 const char *str
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384 );
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385
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386 /**
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387 * Gets a character from a buffer.
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388 *
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389 * The current position of the buffer is increased after a successful read.
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390 *
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391 * @param buffer the buffer to read from
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392 * @return the character or \c EOF, if the end of the buffer is reached
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393 */
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394 __attribute__((__nonnull__))
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395 int cxBufferGet(CxBuffer *buffer);
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396
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397 #ifdef __cplusplus
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398 }
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399 #endif
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400
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401 #endif /* UCX_BUFFER_H */

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