1 | /* |
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2 | * COPYRIGHT (c) 2012, 2018 Chris Johns <chrisj@rtems.org> |
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3 | * |
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4 | * The license and distribution terms for this file may be |
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5 | * found in the file LICENSE in this distribution or at |
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6 | * http://www.rtems.org/license/LICENSE. |
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7 | */ |
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8 | /** |
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9 | * @file |
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10 | * |
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11 | * @ingroup rtems_rtl |
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12 | * |
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13 | * @brief RTEMS Run-Time Linker Object Compression manages a compress |
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14 | * stream of data. |
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15 | */ |
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16 | |
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17 | #ifdef HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | |
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21 | #include <errno.h> |
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22 | #include <string.h> |
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23 | #include <unistd.h> |
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24 | #include <inttypes.h> |
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25 | #include <rtems/inttypes.h> |
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26 | |
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27 | #include <rtems/rtl/rtl-allocator.h> |
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28 | #include <rtems/rtl/rtl-obj-comp.h> |
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29 | #include "rtl-error.h" |
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30 | #include <rtems/rtl/rtl-trace.h> |
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31 | |
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32 | #include "fastlz.h" |
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33 | |
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34 | #include <stdio.h> |
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35 | |
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36 | bool |
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37 | rtems_rtl_obj_comp_open (rtems_rtl_obj_comp* comp, |
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38 | size_t size) |
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39 | { |
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40 | comp->cache = NULL; |
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41 | comp->fd = -1; |
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42 | comp->compression = RTEMS_RTL_COMP_LZ77; |
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43 | comp->offset = 0; |
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44 | comp->size = size; |
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45 | comp->level = 0; |
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46 | comp->buffer = rtems_rtl_alloc_new (RTEMS_RTL_ALLOC_OBJECT, size, false); |
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47 | if (!comp->buffer) |
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48 | { |
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49 | rtems_rtl_set_error (ENOMEM, "no memory for compressor buffer"); |
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50 | return false; |
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51 | } |
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52 | comp->read = 0; |
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53 | return true; |
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54 | } |
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55 | |
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56 | void |
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57 | rtems_rtl_obj_comp_close (rtems_rtl_obj_comp* comp) |
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58 | { |
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59 | rtems_rtl_alloc_del (RTEMS_RTL_ALLOC_OBJECT, comp->buffer); |
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60 | comp->cache = NULL; |
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61 | comp->fd = -1; |
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62 | comp->compression = RTEMS_RTL_COMP_LZ77; |
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63 | comp->level = 0; |
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64 | comp->size = 0; |
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65 | comp->offset = 0; |
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66 | comp->read = 0; |
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67 | } |
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68 | |
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69 | void |
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70 | rtems_rtl_obj_comp_set (rtems_rtl_obj_comp* comp, |
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71 | rtems_rtl_obj_cache* cache, |
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72 | int fd, |
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73 | int compression, |
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74 | off_t offset) |
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75 | { |
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76 | comp->cache = cache; |
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77 | comp->fd = fd; |
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78 | comp->compression = compression; |
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79 | comp->offset = offset; |
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80 | comp->level = 0; |
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81 | comp->read = 0; |
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82 | } |
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83 | |
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84 | bool |
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85 | rtems_rtl_obj_comp_read (rtems_rtl_obj_comp* comp, |
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86 | void* buffer, |
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87 | size_t length) |
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88 | { |
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89 | uint8_t* bin = buffer; |
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90 | |
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91 | if (!comp->cache) |
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92 | { |
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93 | rtems_rtl_set_error (EINVAL, "not open"); |
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94 | return false; |
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95 | } |
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96 | |
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97 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_COMP)) |
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98 | printf ("rtl: comp: %2d: fd=%d length=%zu level=%u offset=%" PRIdoff_t " area=[%" |
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99 | PRIdoff_t ",%" PRIdoff_t "] read=%" PRIu32 " size=%zu\n", |
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100 | comp->fd, comp->cache->fd, length, comp->level, comp->offset, |
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101 | comp->offset, comp->offset + length, |
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102 | comp->read, comp->size); |
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103 | |
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104 | if (comp->fd != comp->cache->fd) |
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105 | { |
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106 | comp->level = 0; |
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107 | } |
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108 | |
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109 | while (length) |
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110 | { |
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111 | size_t buffer_level; |
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112 | |
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113 | buffer_level = length > comp->level ? comp->level : length; |
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114 | |
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115 | if (buffer_level) |
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116 | { |
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117 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_COMP)) |
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118 | printf ("rtl: comp: copy: length=%zu\n", |
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119 | buffer_level); |
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120 | |
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121 | memcpy (bin, comp->buffer, buffer_level); |
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122 | |
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123 | if ((comp->level - buffer_level) != 0) |
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124 | { |
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125 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_COMP)) |
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126 | printf ("rtl: comp: copy-down: level=%u length=%zu\n", |
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127 | comp->level, comp->level - buffer_level); |
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128 | |
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129 | memmove (comp->buffer, |
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130 | comp->buffer + buffer_level, |
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131 | comp->level - buffer_level); |
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132 | } |
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133 | |
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134 | bin += buffer_level; |
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135 | length -= buffer_level; |
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136 | comp->level -= buffer_level; |
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137 | comp->read += buffer_level; |
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138 | } |
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139 | |
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140 | if (length) |
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141 | { |
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142 | uint8_t* input = NULL; |
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143 | uint16_t block_size; |
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144 | size_t in_length = sizeof (block_size); |
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145 | int decompressed; |
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146 | |
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147 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_COMP)) |
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148 | printf ("rtl: comp: read block-size: offset=%" PRIdoff_t "\n", |
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149 | comp->offset); |
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150 | |
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151 | if (!rtems_rtl_obj_cache_read (comp->cache, comp->fd, comp->offset, |
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152 | (void**) &input, &in_length)) |
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153 | return false; |
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154 | |
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155 | block_size = (input[0] << 8) | input[1]; |
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156 | |
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157 | comp->offset += sizeof (block_size); |
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158 | |
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159 | in_length = block_size; |
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160 | |
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161 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_COMP)) |
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162 | printf ("rtl: comp: read block: offset=%" PRIdoff_t " size=%u\n", |
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163 | comp->offset, block_size); |
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164 | |
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165 | if (!rtems_rtl_obj_cache_read (comp->cache, comp->fd, comp->offset, |
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166 | (void**) &input, &in_length)) |
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167 | return false; |
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168 | |
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169 | if (in_length != block_size) |
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170 | { |
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171 | rtems_rtl_set_error (EIO, "compressed read failed: bs=%u in=%zu", |
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172 | block_size, in_length); |
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173 | return false; |
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174 | } |
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175 | |
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176 | switch (comp->compression) |
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177 | { |
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178 | case RTEMS_RTL_COMP_NONE: |
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179 | memcpy (comp->buffer, input, in_length); |
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180 | decompressed = in_length; |
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181 | break; |
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182 | |
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183 | case RTEMS_RTL_COMP_LZ77: |
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184 | decompressed = fastlz_decompress (input, in_length, |
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185 | comp->buffer, comp->size); |
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186 | if (decompressed == 0) |
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187 | { |
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188 | rtems_rtl_set_error (EBADF, "decompression failed"); |
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189 | return false; |
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190 | } |
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191 | break; |
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192 | |
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193 | default: |
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194 | rtems_rtl_set_error (EINVAL, "bad compression type"); |
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195 | return false; |
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196 | } |
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197 | |
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198 | comp->offset += block_size; |
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199 | |
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200 | comp->level = decompressed; |
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201 | |
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202 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_COMP)) |
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203 | printf ("rtl: comp: expand: offset=%" PRIdoff_t \ |
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204 | " level=%u read=%" PRIu32 "\n", |
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205 | comp->offset, comp->level, comp->read); |
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206 | } |
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207 | } |
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208 | |
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209 | return true; |
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210 | } |
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