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annotate packages/fs/jffs2/current/src/compr_zlib.c @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
parents
children a7947d436e85
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1 /*
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2 * JFFS2 -- Journalling Flash File System, Version 2.
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3 *
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4 * Copyright (C) 2001, 2002 Red Hat, Inc.
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5 *
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6 * Created by David Woodhouse <dwmw2@cambridge.redhat.com>
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7 *
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8 * For licensing information, see the file 'LICENCE' in this directory.
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9 *
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10 * $Id: compr_zlib.c,v 1.12 2002/01/25 01:49:26 dwmw2 Exp $
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11 *
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12 */
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13
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14 /* Be careful - there are three environments are supported by this file.
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15 * - Linux kernel.
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16 * - eCos kernel.
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17 * - Userspace (mkfs.jffs2).
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18 */
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19
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20 #ifdef __ECOS
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21 /* Compiling in eCos (or RedBoot) */
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22 #include <cyg/compress/zlib.h>
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23 #include "jffs2port.h"
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24 #include "nodelist.h"
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25
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26 #elif defined(__KERNEL__)
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27 /* Compiling in Linux kernel */
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28 #include <linux/config.h>
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29 #include <linux/kernel.h>
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30 #include <linux/mtd/compatmac.h> /* for min() */
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31 #include <linux/slab.h>
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32 #include <linux/jffs2.h>
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33 #include "nodelist.h"
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34
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35 static void *zalloc(void *opaque, unsigned nr, unsigned size)
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36 {
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37 /* How much does it request? Should we use vmalloc? Or be dynamic? */
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38 return kmalloc(nr * size, GFP_KERNEL);
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39 }
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40
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41 static void zfree(void *opaque, void *addr)
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42 {
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43 kfree(addr);
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44 }
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45 #ifdef CONFIG_ZLIB /* 2.5 kernels will have a shared zlib, at last. */
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46 #include <linux/zlib.h>
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47 #else
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48 #include "zlib.h"
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49 #endif
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50
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51 #else
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52 /* Compiling in Linux(ish) userspace */
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53 #define min(x,y) ((x)<(y)?(x):(y))
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54 #ifndef D1
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55 #define D1(x)
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56 #endif
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57 #define KERN_DEBUG
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58 #define KERN_NOTICE
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59 #define KERN_WARNING
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60 #define printk printf
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61 #include <stdint.h>
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62 #include <stdio.h>
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63 #include <zlib.h>
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64 #endif
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65
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66 /* Plan: call deflate() with avail_in == *sourcelen,
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67 avail_out = *dstlen - 12 and flush == Z_FINISH.
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68 If it doesn't manage to finish, call it again with
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69 avail_in == 0 and avail_out set to the remaining 12
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70 bytes for it to clean up.
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71 Q: Is 12 bytes sufficient?
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72 */
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73 #define STREAM_END_SPACE 12
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74
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75 int jffs2_zlib_compress(unsigned char *data_in, unsigned char *cpage_out,
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76 uint32_t *sourcelen, uint32_t *dstlen)
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77 {
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78 z_stream strm;
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79 int ret;
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80
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81 if (*dstlen <= STREAM_END_SPACE)
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82 return -1;
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83
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84 #ifdef __KERNEL__ /* Linux needs own alloc/free funcs */
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85 strm.zalloc = zalloc;
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86 strm.zfree = zfree;
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87 #else /* eCos and userspace don't */
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88 strm.zalloc = (void *)0;
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89 strm.zfree = (void *)0;
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90 #endif
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91
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92 if (Z_OK != deflateInit(&strm, 3)) {
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93 printk(KERN_WARNING "deflateInit failed\n");
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94 return -1;
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95 }
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96 strm.next_in = data_in;
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97 strm.total_in = 0;
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98
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99 strm.next_out = cpage_out;
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100 strm.total_out = 0;
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101
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102 while (strm.total_out < *dstlen - STREAM_END_SPACE && strm.total_in < *sourcelen) {
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103 strm.avail_out = *dstlen - (strm.total_out + STREAM_END_SPACE);
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104 strm.avail_in = min((unsigned)(*sourcelen-strm.total_in), strm.avail_out);
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105 D1(printk(KERN_DEBUG "calling deflate with avail_in %d, avail_out %d\n",
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106 strm.avail_in, strm.avail_out));
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107 ret = deflate(&strm, Z_PARTIAL_FLUSH);
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108 D1(printk(KERN_DEBUG "deflate returned with avail_in %d, avail_out %d, total_in %ld, total_out %ld\n",
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109 strm.avail_in, strm.avail_out, strm.total_in, strm.total_out));
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110 if (ret != Z_OK) {
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111 D1(printk(KERN_DEBUG "deflate in loop returned %d\n", ret));
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112 deflateEnd(&strm);
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113 return -1;
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114 }
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115 }
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116 strm.avail_out += STREAM_END_SPACE;
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117 strm.avail_in = 0;
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118 ret = deflate(&strm, Z_FINISH);
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119 if (ret != Z_STREAM_END) {
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120 D1(printk(KERN_DEBUG "final deflate returned %d\n", ret));
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121 deflateEnd(&strm);
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122 return -1;
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123 }
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124 deflateEnd(&strm);
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125
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126 D1(printk(KERN_DEBUG "zlib compressed %ld bytes into %ld\n", strm.total_in, strm.total_out));
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127
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128 if (strm.total_out >= strm.total_in)
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129 return -1;
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130
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131
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132 *dstlen = strm.total_out;
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133 *sourcelen = strm.total_in;
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134 return 0;
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135 }
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136
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137 void jffs2_zlib_decompress(unsigned char *data_in, unsigned char *cpage_out,
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138 uint32_t srclen, uint32_t destlen)
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139 {
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140 z_stream strm;
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141 int ret;
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142
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143 #ifdef __KERNEL__
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144 strm.zalloc = zalloc;
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145 strm.zfree = zfree;
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146 #else
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147 strm.zalloc = (void *)0;
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148 strm.zfree = (void *)0;
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149 #endif
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150
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151 if (Z_OK != inflateInit(&strm)) {
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152 printk(KERN_WARNING "inflateInit failed\n");
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153 return;
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154 }
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155 strm.next_in = data_in;
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156 strm.avail_in = srclen;
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157 strm.total_in = 0;
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158
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159 strm.next_out = cpage_out;
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160 strm.avail_out = destlen;
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161 strm.total_out = 0;
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162
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163 while((ret = inflate(&strm, Z_FINISH)) == Z_OK)
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164 ;
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165 if (ret != Z_STREAM_END) {
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166 printk(KERN_NOTICE "inflate returned %d\n", ret);
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167 }
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168 inflateEnd(&strm);
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169 }