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1 /*
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2 * Copyright (C) 2005 Hewlett-Packard Development Company, L.P.
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3 * Contributed by Alex Williamson <alex.williamson@hp.com>
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4 *
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5 * Copyright (C) 2001-2003 Hewlett-Packard Co.
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6 * Contributed by Stephane Eranian <eranian@hpl.hp.com>
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7 *
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8 * Copyright (C) 2001 Silicon Graphics, Inc.
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9 * Contributed by Brent Casavant <bcasavan@sgi.com>
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10 *
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11 * This file is part of the ELILO, the EFI Linux boot loader.
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12 *
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13 * ELILO is free software; you can redistribute it and/or modify
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14 * it under the terms of the GNU General Public License as published by
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15 * the Free Software Foundation; either version 2, or (at your option)
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16 * any later version.
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17 *
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18 * ELILO is distributed in the hope that it will be useful,
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19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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21 * GNU General Public License for more details.
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22 *
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23 * You should have received a copy of the GNU General Public License
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24 * along with ELILO; see the file COPYING. If not, write to the Free
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25 * Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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26 * 02111-1307, USA.
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27 *
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28 * Please check out the elilo.txt for complete documentation on how
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29 * to use this program.
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30 */
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31
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32 #include <efi.h>
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33 #include <efilib.h>
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34
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35 #include "elilo.h"
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36
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37 #include "gzip.h"
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38
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39 #define LD_NAME L"gunzip"
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40
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41 #define memzero(s, n) Memset((VOID *)(s), 0, (n))
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42 #define memcpy(a,b,n) Memcpy((VOID *)(a),(b),(n))
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43
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44 /* size of output buffer */
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45 #define WSIZE 0x8000 /* Window size must be at least 32k, */
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46 /* and a power of two */
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47 /*
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48 * gzip declarations
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49 */
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50 #define OF(args) args
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51 #define FUNC_STATIC static
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52
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53 typedef unsigned char uch;
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54 typedef unsigned short ush;
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55 typedef unsigned long ulg;
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56
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57 /*
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58 * static parameters to gzip helper functions
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59 * we cannot use paramters because API was not
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60 * designed that way
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61 */
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62 static uch *inbuf; /* input buffer (compressed data) */
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63 static uch *window; /* output buffer (uncompressed data) */
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64
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65 static VOID *outbuf;
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66 unsigned char *outptr;
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67 static unsigned long outsize;
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68
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69 static unsigned inptr = 0; /* index of next byte to be processed in inbuf */
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70 static unsigned outcnt = 0; /* bytes in output buffer */
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71
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72 #define get_byte() inbuf[inptr++]
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73
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74 /* Diagnostic functions */
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75 #ifdef INFLATE_DEBUG
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76 # define Assert(cond,msg) {if(!(cond)) error(msg);}
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77 int stderr;
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78 # define Trace(x) Print(L"line %d:\n", __LINE__);
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79 # define Tracev(x) {if (verbose) Print(L"line %d:\n", __LINE__) ;}
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80 # define Tracevv(x) {if (verbose>1) Print(L"line %d:\n", __LINE__) ;}
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81 # define Tracec(c,x) {if (verbose && (c)) Print(L"line %d:\n", __LINE__) ;}
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82 # define Tracecv(c,x) {if (verbose>1 && (c)) Print(L"line %d:\n", __LINE__) ;}
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83 #else
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84 # define Assert(cond,msg)
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85 # define Trace(x)
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86 # define Tracev(x)
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87 # define Tracevv(x)
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88 # define Tracec(c,x)
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89 # define Tracecv(c,x)
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90 #endif
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91
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92 static void flush_window(void);
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93 static void error(char *m);
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94 static long bytes_out;
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95
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96 static void error(char *m);
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97
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98 #define gzip_malloc(size) (void *)alloc(size, 0)
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99 #define gzip_free(where) free(where)
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100
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101 #include "inflate.c"
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102
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103 /*
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104 * Run a set of bytes through the crc shift register. If s is a NULL
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105 * pointer, then initialize the crc shift register contents instead.
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106 * Return the current crc in either case.
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107 *
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108 * Input:
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109 * S pointer to bytes to pump through.
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110 * N number of bytes in S[].
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111 */
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112 static void
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113 updcrc(unsigned char *s, unsigned n)
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114 {
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115 register unsigned long c;
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116 /* crc is defined in inflate.c */
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117
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118 c = crc;
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119 while (n--) {
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120 c = crc_32_tab[((int)c ^ (*s++)) & 0xff] ^ (c >> 8);
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121 }
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122 crc = c;
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123 return;
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124 }
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125
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126 /*
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127 * Clear input and output buffers
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128 */
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129 static void
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130 clear_bufs(void)
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131 {
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132 outcnt = 0;
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133 inptr = 0;
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134 }
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135
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136 /*
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137 * Write the output window window[0..outcnt-1] holding uncompressed
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138 * data and update crc.
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139 */
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140 void
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141 flush_window(void)
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142 {
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143 /*
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144 * We'll end up relying on the CRC check and size check failing
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145 * if there's actually more data than we expect.
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146 */
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147 if (!outcnt || bytes_out + outcnt > outsize)
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148 return;
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149
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150 updcrc(window, outcnt);
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151
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152 Memcpy(outptr, window, outcnt);
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153 outptr += outcnt;
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154 bytes_out += outcnt;
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155
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156 outcnt = 0;
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157 }
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158
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159 static void
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160 error(char *x)
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161 {
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162 ERR_PRT((L"%s : %a", LD_NAME, x));
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163 /* will eventually exit with error from gunzip() */
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164 }
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165
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166 static INT32
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167 decompress(VOID)
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168 {
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169 INT32 ret;
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170
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171 clear_bufs();
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172 makecrc();
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173 Print(L"Uncompressing... ");
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174 ret = gunzip();
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175 if (ret == 0) Print(L"done\n");
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176 return ret == 0 ? 0 : -1;
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177 }
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178
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179 int
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180 gunzip_image(memdesc_t *image)
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181 {
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182 UINTN pgcnt;
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183
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184 inbuf = image->start_addr;
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185
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186 /*
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187 * Last 4 bytes of gzip'd image indicates the uncompressed size
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188 */
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189 outsize = inbuf[image->size - 1] << 24 | inbuf[image->size - 2] << 16 |
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190 inbuf[image->size - 3] << 8 | inbuf[image->size - 4];
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191
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192 pgcnt = EFI_SIZE_TO_PAGES(outsize);
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193
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194 outbuf = alloc_pages(pgcnt, EfiLoaderData, AllocateAnyPages, 0);
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195 if (outbuf == NULL) {
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196 ERR_PRT((L"%s : allocate output buffer failed\n", LD_NAME));
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197 return -1;
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198 }
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199 outptr = outbuf;
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200
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201 window = (void *)alloc(WSIZE, 0);
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202 if (window == NULL) {
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203 ERR_PRT((L"%s : allocate output window failed\n", LD_NAME));
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204 free(outbuf);
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205 return -1;
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206 }
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207
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208 bytes_out = 0;
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209
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210 if (decompress() != 0) {
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211 free(window);
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212 free(outbuf);
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213 return ELILO_LOAD_ERROR;
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214 }
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215
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216 free(window);
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217 free(image->start_addr);
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218
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219 image->start_addr = outbuf;
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220 image->size = outsize;
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221 image->pgcnt = pgcnt;
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222
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223 return ELILO_LOAD_SUCCESS;
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224 }
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