annotate zlib/gzio.c @ 12:8f2256d473fb

Empty changelog
author darius
date Sat, 06 Dec 1997 05:10:46 +0000
parents 1040ca591f2e
children
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10
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1 /* gzio.c -- IO on .gz files
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2 * Copyright (C) 1995 Jean-loup Gailly.
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3 * For conditions of distribution and use, see copyright notice in zlib.h
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4 */
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5
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6 /* $Id: gzio.c,v 1.1.1.1 1997/12/06 04:37:17 darius Exp $ */
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7
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8 #include <stdio.h>
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9
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10 #include "zutil.h"
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11
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12 struct internal_state {int dummy;}; /* for buggy compilers */
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13
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14 #define Z_BUFSIZE 4096
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15
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16 #define ALLOC(size) malloc(size)
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17 #define TRYFREE(p) {if (p) free(p);}
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18
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19 #define GZ_MAGIC_1 0x1f
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20 #define GZ_MAGIC_2 0x8b
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21
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22 /* gzip flag byte */
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23 #define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */
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24 #define HEAD_CRC 0x02 /* bit 1 set: header CRC present */
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25 #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
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26 #define ORIG_NAME 0x08 /* bit 3 set: original file name present */
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27 #define COMMENT 0x10 /* bit 4 set: file comment present */
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28 #define RESERVED 0xE0 /* bits 5..7: reserved */
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29
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30 #ifndef SEEK_CUR
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31 # define SEEK_CUR 1
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32 #endif
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33
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34 typedef struct gz_stream {
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35 z_stream stream;
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36 int z_err; /* error code for last stream operation */
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37 int z_eof; /* set if end of input file */
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38 FILE *file; /* .gz file */
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39 Byte *inbuf; /* input buffer */
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40 Byte *outbuf; /* output buffer */
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41 uLong crc; /* crc32 of uncompressed data */
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42 char *msg; /* error message */
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43 char *path; /* path name for debugging only */
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44 int transparent; /* 1 if input file is not a .gz file */
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45 char mode; /* 'w' or 'r' */
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46 } gz_stream;
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47
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48
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49 local int destroy OF((gz_stream *s));
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50 local gzFile gz_open OF((char *path, char *mode, int fd));
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51 local void putLong OF((FILE *file, uLong x));
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52 local uLong getLong OF((Bytef *buf));
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53
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54 /* ===========================================================================
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55 * Cleanup then free the given gz_stream. Return a zlib error code.
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56 */
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57 local int destroy (s)
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58 gz_stream *s;
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59 {
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60 int err = Z_OK;
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61
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62 if (!s) return Z_STREAM_ERROR;
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63
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64 TRYFREE(s->inbuf);
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65 TRYFREE(s->outbuf);
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66 TRYFREE(s->path);
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67 TRYFREE(s->msg);
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68
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69 if (s->stream.state != NULL) {
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70 if (s->mode == 'w') {
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71 err = deflateEnd(&(s->stream));
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72 } else if (s->mode == 'r') {
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73 err = inflateEnd(&(s->stream));
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74 }
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75 }
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76 if (s->file != NULL && fclose(s->file)) {
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77 err = Z_ERRNO;
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78 }
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79 if (s->z_err < 0) err = s->z_err;
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80 TRYFREE(s);
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81 return err;
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82 }
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83
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84 /* ===========================================================================
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85 Opens a gzip (.gz) file for reading or writing. The mode parameter
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86 is as in fopen ("rb" or "wb"). The file is given either by file descritor
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87 or path name (if fd == -1).
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88 gz_open return NULL if the file could not be opened or if there was
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89 insufficient memory to allocate the (de)compression state; errno
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90 can be checked to distinguish the two cases (if errno is zero, the
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91 zlib error is Z_MEM_ERROR).
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92 */
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93 local gzFile gz_open (path, mode, fd)
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94 char *path;
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95 char *mode;
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96 int fd;
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97 {
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98 int err;
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99 int level = Z_DEFAULT_COMPRESSION; /* compression level */
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100 char *p = mode;
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101 gz_stream *s = (gz_stream *)ALLOC(sizeof(gz_stream));
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102
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103 if (!s) return Z_NULL;
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104
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105 s->stream.zalloc = (alloc_func)0;
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106 s->stream.zfree = (free_func)0;
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107 s->stream.next_in = s->inbuf = Z_NULL;
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108 s->stream.next_out = s->outbuf = Z_NULL;
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109 s->stream.avail_in = s->stream.avail_out = 0;
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110 s->file = NULL;
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111 s->z_err = Z_OK;
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112 s->z_eof = 0;
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113 s->crc = crc32(0L, Z_NULL, 0);
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114 s->msg = NULL;
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115 s->transparent = 0;
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116
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117 s->path = (char*)ALLOC(strlen(path)+1);
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118 if (s->path == NULL) {
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119 return destroy(s), (gzFile)Z_NULL;
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120 }
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121 strcpy(s->path, path); /* do this early for debugging */
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122
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123 s->mode = '\0';
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124 do {
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125 if (*p == 'r') s->mode = 'r';
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126 if (*p == 'w') s->mode = 'w';
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127 if (*p >= '1' && *p <= '9') level = *p - '0';
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128 } while (*p++);
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129 if (s->mode == '\0') return destroy(s), (gzFile)Z_NULL;
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130
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131 if (s->mode == 'w') {
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132 err = deflateInit2(&(s->stream), level,
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133 DEFLATED, -MAX_WBITS, DEF_MEM_LEVEL, 0);
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134 /* windowBits is passed < 0 to suppress zlib header */
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135
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136 s->stream.next_out = s->outbuf = (Byte*)ALLOC(Z_BUFSIZE);
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137
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138 if (err != Z_OK || s->outbuf == Z_NULL) {
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139 return destroy(s), (gzFile)Z_NULL;
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140 }
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141 } else {
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142 err = inflateInit2(&(s->stream), -MAX_WBITS);
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143 s->stream.next_in = s->inbuf = (Byte*)ALLOC(Z_BUFSIZE);
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144
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145 if (err != Z_OK || s->inbuf == Z_NULL) {
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146 return destroy(s), (gzFile)Z_NULL;
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147 }
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148 }
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149 s->stream.avail_out = Z_BUFSIZE;
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150
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151 errno = 0;
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152 s->file = fd < 0 ? FOPEN(path, mode) : fdopen(fd, mode);
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153
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154 if (s->file == NULL) {
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155 return destroy(s), (gzFile)Z_NULL;
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156 }
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157 if (s->mode == 'w') {
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158 /* Write a very simple .gz header:
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159 */
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160 fprintf(s->file, "%c%c%c%c%c%c%c%c%c%c", GZ_MAGIC_1, GZ_MAGIC_2,
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161 DEFLATED, 0 /*flags*/, 0,0,0,0 /*time*/, 0 /*xflags*/, OS_CODE);
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162 } else {
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163 /* Check and skip the header:
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164 */
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165 Byte c1 = 0, c2 = 0;
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166 Byte method = 0;
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167 Byte flags = 0;
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168 Byte xflags = 0;
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169 Byte time[4];
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170 Byte osCode;
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171 int c;
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172
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173 s->stream.avail_in = fread(s->inbuf, 1, 2, s->file);
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174 if (s->stream.avail_in != 2 || s->inbuf[0] != GZ_MAGIC_1
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175 || s->inbuf[1] != GZ_MAGIC_2) {
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176 s->transparent = 1;
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177 return (gzFile)s;
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178 }
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179 s->stream.avail_in = 0;
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180 fscanf(s->file,"%c%c%4c%c%c", &method, &flags, time, &xflags, &osCode);
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181
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182 if (method != DEFLATED || feof(s->file) || (flags & RESERVED) != 0) {
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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diff changeset
183 s->z_err = Z_DATA_ERROR;
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184 return (gzFile)s;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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185 }
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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parents:
diff changeset
186 if ((flags & EXTRA_FIELD) != 0) { /* skip the extra field */
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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diff changeset
187 long len;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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188 fscanf(s->file, "%c%c", &c1, &c2);
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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189 len = c1 + ((long)c2<<8);
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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diff changeset
190 fseek(s->file, len, SEEK_CUR);
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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parents:
diff changeset
191 }
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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diff changeset
192 if ((flags & ORIG_NAME) != 0) { /* skip the original file name */
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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193 while ((c = getc(s->file)) != 0 && c != EOF) ;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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194 }
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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195 if ((flags & COMMENT) != 0) { /* skip the .gz file comment */
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parents:
diff changeset
196 while ((c = getc(s->file)) != 0 && c != EOF) ;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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197 }
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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198 if ((flags & HEAD_CRC) != 0) { /* skip the header crc */
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199 fscanf(s->file, "%c%c", &c1, &c2);
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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200 }
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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diff changeset
201 if (feof(s->file)) {
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202 s->z_err = Z_DATA_ERROR;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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parents:
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203 }
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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204 }
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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diff changeset
205 return (gzFile)s;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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206 }
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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207
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208 /* ===========================================================================
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209 Opens a gzip (.gz) file for reading or writing.
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210 */
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211 gzFile gzopen (path, mode)
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212 char *path;
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213 char *mode;
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214 {
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215 return gz_open (path, mode, -1);
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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216 }
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217
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218 /* ===========================================================================
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219 Associate a gzFile with the file descriptor fd.
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220 */
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221 gzFile gzdopen (fd, mode)
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222 int fd;
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223 char *mode;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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224 {
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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225 char name[20];
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226 sprintf(name, "<fd:%d>", fd); /* for debugging */
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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227
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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228 return gz_open (name, mode, fd);
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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229 }
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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230
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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231 /* ===========================================================================
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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232 Reads the given number of uncompressed bytes from the compressed file.
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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233 gzread returns the number of bytes actually read (0 for end of file).
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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234 */
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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235 int gzread (file, buf, len)
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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236 gzFile file;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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237 voidp buf;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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238 unsigned len;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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parents:
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239 {
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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diff changeset
240 gz_stream *s = (gz_stream*)file;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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241
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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242 if (s == NULL || s->mode != 'r') return Z_STREAM_ERROR;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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parents:
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243
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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parents:
diff changeset
244 if (s->transparent) {
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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245 int n = 0;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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parents:
diff changeset
246 Byte *b = (Byte*)buf;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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parents:
diff changeset
247 /* Copy the first two (non-magic) bytes if not done already */
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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248 while (s->stream.avail_in > 0 && len > 0) {
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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249 *b++ = *s->stream.next_in++;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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parents:
diff changeset
250 s->stream.avail_in--;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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parents:
diff changeset
251 len--; n++;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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parents:
diff changeset
252 }
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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parents:
diff changeset
253 if (len == 0) return n;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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parents:
diff changeset
254 return n + fread(b, 1, len, s->file);
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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parents:
diff changeset
255 }
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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parents:
diff changeset
256 if (s->z_err == Z_DATA_ERROR) return -1; /* bad .gz file */
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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parents:
diff changeset
257 if (s->z_err == Z_STREAM_END) return 0; /* don't read crc as data */
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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parents:
diff changeset
258
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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parents:
diff changeset
259 s->stream.next_out = buf;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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parents:
diff changeset
260 s->stream.avail_out = len;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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parents:
diff changeset
261
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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parents:
diff changeset
262 while (s->stream.avail_out != 0) {
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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parents:
diff changeset
263
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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parents:
diff changeset
264 if (s->stream.avail_in == 0 && !s->z_eof) {
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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parents:
diff changeset
265
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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parents:
diff changeset
266 errno = 0;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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parents:
diff changeset
267 s->stream.avail_in =
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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parents:
diff changeset
268 fread(s->inbuf, 1, Z_BUFSIZE, s->file);
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
269 if (s->stream.avail_in == 0) {
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
270 s->z_eof = 1;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
271 } else if (s->stream.avail_in == (uInt)EOF) {
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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parents:
diff changeset
272 s->stream.avail_in = 0;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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parents:
diff changeset
273 s->z_eof = 1;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
274 s->z_err = Z_ERRNO;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
275 break;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
276 }
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
277 s->stream.next_in = s->inbuf;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
278 }
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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parents:
diff changeset
279 s->z_err = inflate(&(s->stream), Z_NO_FLUSH);
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
280
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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parents:
diff changeset
281 if (s->z_err == Z_STREAM_END ||
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
282 s->z_err != Z_OK || s->z_eof) break;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
283 }
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
284 len -= s->stream.avail_out;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
285 s->crc = crc32(s->crc, buf, len);
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
286 return (int)len;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
287 }
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
288
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
289 /* ===========================================================================
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
290 Writes the given number of uncompressed bytes into the compressed file.
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
291 gzwrite returns the number of bytes actually written (0 in case of error).
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
292 */
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
293 int gzwrite (file, buf, len)
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
294 gzFile file;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
295 voidp buf;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
296 unsigned len;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
297 {
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
298 gz_stream *s = (gz_stream*)file;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
299
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
300 if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
301
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
302 s->stream.next_in = buf;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
303 s->stream.avail_in = len;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
304
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
305 while (s->stream.avail_in != 0) {
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
306
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
307 if (s->stream.avail_out == 0) {
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
308
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
309 s->stream.next_out = s->outbuf;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
310 if (fwrite(s->outbuf, 1, Z_BUFSIZE, s->file) != Z_BUFSIZE) {
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
311 s->z_err = Z_ERRNO;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
312 break;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
313 }
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
314 s->stream.avail_out = Z_BUFSIZE;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
315 }
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
316 s->z_err = deflate(&(s->stream), Z_NO_FLUSH);
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
317 if (s->z_err != Z_OK) break;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
318 }
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
319 s->crc = crc32(s->crc, buf, len);
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
320
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
321 return (int)(len - s->stream.avail_in);
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
322 }
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
323
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
324 /* ===========================================================================
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
325 Flushes all pending output into the compressed file. The parameter
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
326 flush is as in the deflate() function.
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
327 gzflush should be called only when strictly necessary because it can
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
328 degrade compression.
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
329 */
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
330 int gzflush (file, flush)
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
331 gzFile file;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
332 int flush;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
333 {
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
334 uInt len;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
335 int done = 0;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
336 gz_stream *s = (gz_stream*)file;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
337
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
338 if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
339
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
340 s->stream.avail_in = 0; /* should be zero already anyway */
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
341
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
342 for (;;) {
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
343 len = Z_BUFSIZE - s->stream.avail_out;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
344
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
345 if (len != 0) {
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
346 if (fwrite(s->outbuf, 1, len, s->file) != len) {
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
347 s->z_err = Z_ERRNO;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
348 return Z_ERRNO;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
349 }
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
350 s->stream.next_out = s->outbuf;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
351 s->stream.avail_out = Z_BUFSIZE;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
352 }
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
353 if (done) break;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
354 s->z_err = deflate(&(s->stream), flush);
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
355
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
356 /* deflate has finished flushing only when it hasn't used up
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
357 * all the available space in the output buffer:
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
358 */
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
359 done = (s->stream.avail_out != 0 || s->z_err == Z_STREAM_END);
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
360
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
361 if (s->z_err != Z_OK && s->z_err != Z_STREAM_END) break;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
parents:
diff changeset
362 }
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
darius
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363 fflush(s->file);
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364 return s->z_err == Z_STREAM_END ? Z_OK : s->z_err;
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365 }
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366
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367 /* ===========================================================================
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368 Outputs a long in LSB order to the given file
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369 */
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370 local void putLong (file, x)
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371 FILE *file;
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372 uLong x;
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373 {
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374 int n;
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375 for (n = 0; n < 4; n++) {
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376 fputc((int)(x & 0xff), file);
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377 x >>= 8;
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378 }
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379 }
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380
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381 /* ===========================================================================
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382 Reads a long in LSB order from the given buffer
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383 */
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384 local uLong getLong (buf)
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385 Bytef *buf;
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386 {
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387 uLong x = 0;
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388 Bytef *p = buf+4;
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389
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390 do {
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391 x <<= 8;
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392 x |= *--p;
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393 } while (p != buf);
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394 return x;
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395 }
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396
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397 /* ===========================================================================
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398 Flushes all pending output if necessary, closes the compressed file
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399 and deallocates all the (de)compression state.
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400 */
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401 int gzclose (file)
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402 gzFile file;
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403 {
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404 uInt n;
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405 int err;
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406 gz_stream *s = (gz_stream*)file;
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407
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408 if (s == NULL) return Z_STREAM_ERROR;
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409
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410 if (s->mode == 'w') {
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411 err = gzflush (file, Z_FINISH);
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412 if (err != Z_OK) return destroy(file);
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413
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414 putLong (s->file, s->crc);
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415 putLong (s->file, s->stream.total_in);
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416
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417 } else if (s->mode == 'r' && s->z_err == Z_STREAM_END) {
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418
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419 /* slide CRC and original size if they are at the end of inbuf */
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420 if ((n = s->stream.avail_in) < 8 && !s->z_eof) {
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421 Byte *p = s->inbuf;
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422 Bytef *q = s->stream.next_in;
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423 while (n--) { *p++ = *q++; };
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424
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425 n = s->stream.avail_in;
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426 n += fread(p, 1, 8, s->file);
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427 s->stream.next_in = s->inbuf;
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428 }
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429 /* check CRC and original size */
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430 if (n < 8 ||
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431 getLong(s->stream.next_in) != s->crc ||
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432 getLong(s->stream.next_in + 4) != s->stream.total_out) {
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433
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434 s->z_err = Z_DATA_ERROR;
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435 }
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436 }
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437 return destroy(file);
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438 }
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439
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440 /* ===========================================================================
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441 Returns the error message for the last error which occured on the
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442 given compressed file. errnum is set to zlib error number. If an
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443 error occured in the file system and not in the compression library,
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444 errnum is set to Z_ERRNO and the application may consult errno
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445 to get the exact error code.
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446 */
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447 char* gzerror (file, errnum)
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448 gzFile file;
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449 int *errnum;
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450 {
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451 char *m;
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452 gz_stream *s = (gz_stream*)file;
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453
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454 if (s == NULL) {
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455 *errnum = Z_STREAM_ERROR;
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456 return z_errmsg[1-Z_STREAM_ERROR];
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457 }
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458 *errnum = s->z_err;
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459 if (*errnum == Z_OK) return "";
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460
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461 m = *errnum == Z_ERRNO ? zstrerror(errno) : s->stream.msg;
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462
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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463 if (m == NULL || *m == '\0') m = z_errmsg[1-s->z_err];
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464
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465 TRYFREE(s->msg);
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466 s->msg = (char*)ALLOC(strlen(s->path) + strlen(m) + 3);
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467 strcpy(s->msg, s->path);
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468 strcat(s->msg, ": ");
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469 strcat(s->msg, m);
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470 return s->msg;
1040ca591f2e First entry of Paradise Server 2.9 patch 10 Beta
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471 }