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annotate packages/redboot/current/src/decompress.c @ 280:96e3418e1f5b

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From Jani Monoses: fix HTTP loading, FIS delete
author gthomas
date Fri, 09 Aug 2002 13:20:32 +0000
parents d2c90368aeef
children 906a5d289c6d
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1 //==========================================================================
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2 //
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3 // decompress.c
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4 //
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5 // RedBoot decompress support
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6 //
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7 //==========================================================================
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8 //####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later version.
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16 //
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 // for more details.
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21 //
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22 // You should have received a copy of the GNU General Public License along
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23 // with eCos; if not, write to the Free Software Foundation, Inc.,
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 //
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26 // As a special exception, if other files instantiate templates or use macros
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27 // or inline functions from this file, or you compile this file and link it
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28 // with other works to produce a work based on this file, this file does not
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29 // by itself cause the resulting work to be covered by the GNU General Public
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30 // License. However the source code for this file must still be made available
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31 // in accordance with section (3) of the GNU General Public License.
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32 //
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33 // This exception does not invalidate any other reasons why a work based on
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34 // this file might be covered by the GNU General Public License.
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35 //
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 // at http://sources.redhat.com/ecos/ecos-license/
208
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
156
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40 //==========================================================================
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41 //#####DESCRIPTIONBEGIN####
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42 //
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43 // Author(s): jskov
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44 // Contributors: jskov, gthomas
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45 // Date: 2001-03-08
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46 // Purpose:
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47 // Description:
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48 //
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49 // This code is part of RedBoot (tm).
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50 //
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51 //####DESCRIPTIONEND####
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52 //
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53 //==========================================================================
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54
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55 #include <redboot.h>
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56
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57 #ifdef CYGPKG_COMPRESS_ZLIB
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58 #include <cyg/compress/zlib.h>
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59 static z_stream stream;
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60
191
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61 #define __ZLIB_MAGIC__ 0x5A4C4942 // 'ZLIB'
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62
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63 //
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64 // Free memory [blocks] are stored as a linked list of "struct _block"
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65 // When free, 'size' is the size of the whole block
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66 // When allocated, 'size' is the allocation size
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67 // The 'magic' is kept to insure that the block being freed is reasonable
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68 //
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69 struct _block {
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70 int size;
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71 long magic; // Must be __ZLIB_MAGIC__
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72 struct _block *next;
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73 struct _block *self;
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74 };
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75 static struct _block *memlist;
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76
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77 #define ZLIB_COMPRESSION_OVERHEAD 0xC000
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78 static void *zlib_workspace;
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79
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80 //
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81 // This function is run as part of RedBoot's initialization.
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82 // It will allocate some memory from the "workspace" pool for
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83 // use by the gzip/zlib routines. This allows the memory usage
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84 // of RedBoot to be more finely controlled than if we simply
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85 // used the generic 'malloc() from the heap' functionality.
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86 //
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87 static void
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88 _zlib_init(void)
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89 {
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90 // Allocate some RAM for use by the gzip/zlib routines
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91 workspace_end -= ZLIB_COMPRESSION_OVERHEAD;
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92 zlib_workspace = workspace_end;
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93 }
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94
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95 RedBoot_init(_zlib_init, RedBoot_INIT_FIRST);
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96
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97 // #define DEBUG_ZLIB_MALLOC
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98 #ifdef DEBUG_ZLIB_MALLOC
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99 static void
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100 show_memlist(char *when)
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101 {
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102 struct _block *bp = memlist;
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103
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104 diag_printf("memory list after %s\n", when);
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105 while (bp != (struct _block *)0) {
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106 diag_printf(" %08p %5d %08p\n", bp, bp->size, bp->next);
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107 bp = bp->next;
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108 }
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109 }
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110 #endif
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111
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112 // Note: these have to be global and match the prototype used by the
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113 // gzip/zlib package since we are exactly replacing them.
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114
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115 void
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116 *zcalloc(void *opaque, unsigned int items, unsigned int size)
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117 {
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118 voidpf res;
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119 int len = (items*size);
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120 struct _block *bp = memlist;
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121 struct _block *nbp, *pbp;
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122
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123 // Simple, first-fit algorithm
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124 pbp = (struct _block *)0;
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125 while (bp) {
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126 if (bp->size > len) {
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127 nbp = (struct _block *)((char *)bp + len + sizeof(struct _block));
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128 nbp->next = bp->next;
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129 nbp->size = bp->size - len;
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130 if (pbp) {
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131 pbp->next = nbp;
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132 } else {
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133 memlist = nbp;
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134 }
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135 res = bp;
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136 break;
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137 }
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138 pbp = bp;
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139 bp = bp->next;
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140 }
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141 if (bp) {
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142 bp->size = len;
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143 bp->magic = __ZLIB_MAGIC__;
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144 bp->self = bp;
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145 res = bp+1;
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146 memset(res, 0, len);
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147 } else {
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148 res = 0; // No memory left
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149 }
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150 #ifdef DEBUG_ZLIB_MALLOC
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151 diag_printf("%s(%d,%d) = %p\n", __FUNCTION__, items, size, res);
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152 show_memlist(__FUNCTION__);
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153 #endif
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154 return res;
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155 }
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156
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157 void
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158 zcfree(void *opaque, void *ptr)
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159 {
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160 struct _block *bp, *pbp, *nbp;
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161 int size;
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162
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163 if (!ptr) return; // Safety
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164 bp = (struct _block *)((char *)ptr - sizeof(struct _block));
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165 if ((bp->magic != __ZLIB_MAGIC__) || (bp->self != bp)) {
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166 diag_printf("%s(%p) - invalid block\n", __FUNCTION__, ptr);
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167 return;
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168 }
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169 size = bp->size;
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170 #ifdef DEBUG_ZLIB_MALLOC
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171 diag_printf("%s(%p) = %d bytes\n", __FUNCTION__, ptr, size);
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172 #endif
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173 // See if this block is adjacent to a free block
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174 nbp = memlist;
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175 pbp = (struct _block *)0;
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176 while (nbp) {
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177 if ((char *)bp+size+sizeof(struct _block) == (char *)nbp) {
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178 // The block being freed fits just before
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179 bp->next = nbp->next;
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180 bp->size = nbp->size + size + sizeof(struct _block);
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181 #ifdef DEBUG_ZLIB_MALLOC
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182 diag_printf("Free before\n");
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183 #endif
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184 if (pbp) {
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185 pbp->next = bp;
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186 // See if this new block and the previous one can
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187 // be combined.
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188 if ((char *)pbp+pbp->size == (char *)bp) {
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189 #ifdef DEBUG_ZLIB_MALLOC
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190 diag_printf("Collapse [before] - p: %p/%d/%p, n: %p/%d/%p\n",
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191 pbp, pbp->size, pbp->next,
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192 bp, bp->size, bp->next);
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193 #endif
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194 pbp->size += bp->size;
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195 pbp->next = bp->next;
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196 }
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197 } else {
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198 memlist = bp;
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199 }
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200 #ifdef DEBUG_ZLIB_MALLOC
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201 show_memlist(__FUNCTION__);
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202 #endif
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203 return;
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204 } else
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205 if ((char *)nbp+nbp->size == (char *)bp) {
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206 // The block being freed fits just after
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207 nbp->size += size + sizeof(struct _block);
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208 // See if it will now collapse with the following block
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209 #ifdef DEBUG_ZLIB_MALLOC
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210 diag_printf("Free after\n");
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211 #endif
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212 if (nbp->next != (struct _block *)0) {
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213 if ((char *)nbp+nbp->size == (char *)nbp->next) {
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214 #ifdef DEBUG_ZLIB_MALLOC
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215 diag_printf("Collapse [after] - p: %p/%d/%p, n: %p/%d/%p\n",
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216 nbp, nbp->size, nbp->next,
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217 nbp->next, nbp->next->size, nbp->next->next);
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218 #endif
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219 nbp->size += (nbp->next)->size;
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220 nbp->next = (nbp->next)->next;
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221 }
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222 }
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223 #ifdef DEBUG_ZLIB_MALLOC
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224 show_memlist(__FUNCTION__);
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225 #endif
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226 return;
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227 } else {
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228 pbp = nbp;
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229 nbp = nbp->next;
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230 }
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231 }
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232 }
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233
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234 //
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235 // This function is called to initialize a gzip/zlib stream.
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236 // Note that it also reinitializes the memory pool every time.
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237 //
156
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238 static int
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239 gzip_init(_pipe_t* p)
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240 {
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241 int err;
191
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242 struct _block *bp;
156
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243
191
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244 bp = (struct _block *)zlib_workspace;
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245 memlist = bp;
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246 bp->next = 0;
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247 bp->size = ZLIB_COMPRESSION_OVERHEAD;
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248 stream.zalloc = zcalloc;
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249 stream.zfree = zcfree;
156
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250 stream.next_in = NULL;
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251 stream.avail_in = 0;
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252 stream.next_out = NULL;
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253 stream.avail_out = 0;
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254 err = inflateInit(&stream);
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255
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256 return err;
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257 }
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258
191
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259 //
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260 // This function is called during the decompression cycle to
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261 // actually cause a buffer to be filled with uncompressed data.
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262 //
156
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263 static int
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264 gzip_inflate(_pipe_t* p)
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265 {
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266 int err;
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267
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268 stream.next_in = p->in_buf;
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269 stream.avail_in = p->in_avail;
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270 stream.next_out = p->out_buf;
208
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271 stream.avail_out = p->out_max;
156
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272 err = inflate(&stream, Z_SYNC_FLUSH);
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273 p->out_size += (stream.next_out - p->out_buf);
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274 p->out_buf = stream.next_out;
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275 p->msg = stream.msg;
208
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276 p->in_avail = stream.avail_in;
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277 p->in_buf = stream.next_in;
156
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278
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279 return err;
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280 }
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281
191
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282 //
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283 // Called when the input data is completed or an error has
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284 // occured. This allows for clean up as well as passing error
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285 // information up.
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286 //
156
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287 static int
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288 gzip_close(_pipe_t* p, int err)
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289 {
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290 switch (err) {
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291 case Z_STREAM_END:
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292 err = 0;
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293 break;
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294 case Z_OK:
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295 // Decompression didn't complete
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296 p->msg = "premature end of input";
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297 // fall-through
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298 default:
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299 err = -1;
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300 break;
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301 }
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302
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303 inflateEnd(&stream);
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304
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305 return err;
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306 }
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307
191
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308 //
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309 // Exported interfaces
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310 //
156
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311 _decompress_fun_init* _dc_init = gzip_init;
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312 _decompress_fun_inflate* _dc_inflate = gzip_inflate;
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313 _decompress_fun_close* _dc_close = gzip_close;
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314 #endif // CYGPKG_COMPRESS_ZLIB