1 | /* vi: set sw=4 ts=4: */
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2 | #ifndef UNARCHIVE_H
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3 | #define UNARCHIVE_H 1
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4 |
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5 | PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
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6 |
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7 | enum {
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8 | #if BB_BIG_ENDIAN
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9 | COMPRESS_MAGIC = 0x1f9d,
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10 | GZIP_MAGIC = 0x1f8b,
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11 | BZIP2_MAGIC = 256 * 'B' + 'Z',
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12 | /* .xz signature: 0xfd, '7', 'z', 'X', 'Z', 0x00 */
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13 | /* More info at: http://tukaani.org/xz/xz-file-format.txt */
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14 | XZ_MAGIC1 = 256 * 0xfd + '7',
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15 | XZ_MAGIC2 = 256 * (unsigned)(256 * (256 * 'z' + 'X') + 'Z') + 0,
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16 | /* Different form: 32 bits, then 16 bits: */
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17 | /* (unsigned) cast suppresses "integer overflow in expression" warning */
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18 | XZ_MAGIC1a = 256 * (unsigned)(256 * (256 * 0xfd + '7') + 'z') + 'X',
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19 | XZ_MAGIC2a = 256 * 'Z' + 0,
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20 | #else
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21 | COMPRESS_MAGIC = 0x9d1f,
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22 | GZIP_MAGIC = 0x8b1f,
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23 | BZIP2_MAGIC = 'B' + 'Z' * 256,
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24 | XZ_MAGIC1 = 0xfd + '7' * 256,
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25 | XZ_MAGIC2 = 'z' + ('X' + ('Z' + 0 * 256) * 256) * 256,
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26 | XZ_MAGIC1a = 0xfd + ('7' + ('z' + 'X' * 256) * 256) * 256,
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27 | XZ_MAGIC2a = 'Z' + 0 * 256,
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28 | #endif
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29 | };
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30 |
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31 | typedef struct file_header_t {
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32 | char *name;
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33 | char *link_target;
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34 | #if ENABLE_FEATURE_TAR_UNAME_GNAME
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35 | char *tar__uname;
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36 | char *tar__gname;
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37 | #endif
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38 | off_t size;
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39 | uid_t uid;
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40 | gid_t gid;
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41 | mode_t mode;
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42 | time_t mtime;
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43 | dev_t device;
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44 | } file_header_t;
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45 |
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46 | struct hardlinks_t;
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47 |
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48 | typedef struct archive_handle_t {
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49 | /* Flags. 1st since it is most used member */
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50 | unsigned ah_flags;
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51 |
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52 | /* The raw stream as read from disk or stdin */
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53 | int src_fd;
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54 |
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55 | /* Define if the header and data component should be processed */
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56 | char FAST_FUNC (*filter)(struct archive_handle_t *);
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57 | /* List of files that have been accepted */
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58 | llist_t *accept;
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59 | /* List of files that have been rejected */
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60 | llist_t *reject;
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61 | /* List of files that have successfully been worked on */
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62 | llist_t *passed;
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63 |
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64 | /* Currently processed file's header */
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65 | file_header_t *file_header;
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66 |
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67 | /* Process the header component, e.g. tar -t */
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68 | void FAST_FUNC (*action_header)(const file_header_t *);
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69 |
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70 | /* Process the data component, e.g. extract to filesystem */
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71 | void FAST_FUNC (*action_data)(struct archive_handle_t *);
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72 |
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73 | /* Function that skips data */
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74 | void FAST_FUNC (*seek)(int fd, off_t amount);
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75 |
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76 | /* Count processed bytes */
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77 | off_t offset;
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78 |
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79 | /* Archiver specific. Can make it a union if it ever gets big */
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80 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS
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81 | unsigned tar__strip_components;
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82 | #endif
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83 | #define PAX_NEXT_FILE 0
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84 | #define PAX_GLOBAL 1
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85 | #if ENABLE_TAR || ENABLE_DPKG || ENABLE_DPKG_DEB
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86 | smallint tar__end;
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87 | # if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
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88 | char* tar__longname;
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89 | char* tar__linkname;
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90 | # endif
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91 | # if ENABLE_FEATURE_TAR_TO_COMMAND
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92 | char* tar__to_command;
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93 | const char* tar__to_command_shell;
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94 | # endif
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95 | # if ENABLE_FEATURE_TAR_SELINUX
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96 | char* tar__sctx[2];
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97 | # endif
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98 | #endif
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99 | #if ENABLE_CPIO || ENABLE_RPM2CPIO || ENABLE_RPM
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100 | uoff_t cpio__blocks;
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101 | struct bb_uidgid_t cpio__owner;
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102 | struct hardlinks_t *cpio__hardlinks_to_create;
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103 | struct hardlinks_t *cpio__created_hardlinks;
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104 | #endif
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105 | #if ENABLE_DPKG || ENABLE_DPKG_DEB
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106 | /* Temporary storage */
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107 | char *dpkg__buffer;
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108 | /* How to process any sub archive, e.g. get_header_tar_gz */
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109 | char FAST_FUNC (*dpkg__action_data_subarchive)(struct archive_handle_t *);
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110 | /* Contains the handle to a sub archive */
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111 | struct archive_handle_t *dpkg__sub_archive;
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112 | #endif
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113 | #if ENABLE_FEATURE_AR_CREATE
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114 | const char *ar__name;
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115 | struct archive_handle_t *ar__out;
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116 | #endif
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117 | } archive_handle_t;
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118 | /* bits in ah_flags */
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119 | #define ARCHIVE_RESTORE_DATE (1 << 0)
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120 | #define ARCHIVE_CREATE_LEADING_DIRS (1 << 1)
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121 | #define ARCHIVE_UNLINK_OLD (1 << 2)
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122 | #define ARCHIVE_EXTRACT_QUIET (1 << 3)
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123 | #define ARCHIVE_EXTRACT_NEWER (1 << 4)
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124 | #define ARCHIVE_DONT_RESTORE_OWNER (1 << 5)
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125 | #define ARCHIVE_DONT_RESTORE_PERM (1 << 6)
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126 | #define ARCHIVE_NUMERIC_OWNER (1 << 7)
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127 | #define ARCHIVE_O_TRUNC (1 << 8)
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128 | #define ARCHIVE_REMEMBER_NAMES (1 << 9)
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129 | #if ENABLE_RPM
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130 | #define ARCHIVE_REPLACE_VIA_RENAME (1 << 10)
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131 | #endif
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132 |
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133 |
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134 | /* POSIX tar Header Block, from POSIX 1003.1-1990 */
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135 | #define TAR_BLOCK_SIZE 512
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136 | #define NAME_SIZE 100
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137 | #define NAME_SIZE_STR "100"
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138 | typedef struct tar_header_t { /* byte offset */
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139 | char name[NAME_SIZE]; /* 0-99 */
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140 | char mode[8]; /* 100-107 */
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141 | char uid[8]; /* 108-115 */
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142 | char gid[8]; /* 116-123 */
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143 | char size[12]; /* 124-135 */
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144 | char mtime[12]; /* 136-147 */
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145 | char chksum[8]; /* 148-155 */
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146 | char typeflag; /* 156-156 */
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147 | char linkname[NAME_SIZE]; /* 157-256 */
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148 | /* POSIX: "ustar" NUL "00" */
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149 | /* GNU tar: "ustar " NUL */
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150 | /* Normally it's defined as magic[6] followed by
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151 | * version[2], but we put them together to save code.
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152 | */
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153 | char magic[8]; /* 257-264 */
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154 | char uname[32]; /* 265-296 */
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155 | char gname[32]; /* 297-328 */
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156 | char devmajor[8]; /* 329-336 */
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157 | char devminor[8]; /* 337-344 */
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158 | char prefix[155]; /* 345-499 */
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159 | char padding[12]; /* 500-512 (pad to exactly TAR_BLOCK_SIZE) */
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160 | } tar_header_t;
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161 | struct BUG_tar_header {
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162 | char c[sizeof(tar_header_t) == TAR_BLOCK_SIZE ? 1 : -1];
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163 | };
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164 |
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165 |
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166 | extern const char cpio_TRAILER[];
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167 |
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168 |
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169 | archive_handle_t *init_handle(void) FAST_FUNC;
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170 |
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171 | char filter_accept_all(archive_handle_t *archive_handle) FAST_FUNC;
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172 | char filter_accept_list(archive_handle_t *archive_handle) FAST_FUNC;
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173 | char filter_accept_list_reassign(archive_handle_t *archive_handle) FAST_FUNC;
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174 | char filter_accept_reject_list(archive_handle_t *archive_handle) FAST_FUNC;
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175 |
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176 | void unpack_ar_archive(archive_handle_t *ar_archive) FAST_FUNC;
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177 |
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178 | void data_skip(archive_handle_t *archive_handle) FAST_FUNC;
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179 | void data_extract_all(archive_handle_t *archive_handle) FAST_FUNC;
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180 | void data_extract_to_stdout(archive_handle_t *archive_handle) FAST_FUNC;
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181 | void data_extract_to_command(archive_handle_t *archive_handle) FAST_FUNC;
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182 |
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183 | void header_skip(const file_header_t *file_header) FAST_FUNC;
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184 | void header_list(const file_header_t *file_header) FAST_FUNC;
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185 | void header_verbose_list(const file_header_t *file_header) FAST_FUNC;
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186 |
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187 | char get_header_ar(archive_handle_t *archive_handle) FAST_FUNC;
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188 | char get_header_cpio(archive_handle_t *archive_handle) FAST_FUNC;
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189 | char get_header_tar(archive_handle_t *archive_handle) FAST_FUNC;
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190 | char get_header_tar_gz(archive_handle_t *archive_handle) FAST_FUNC;
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191 | char get_header_tar_bz2(archive_handle_t *archive_handle) FAST_FUNC;
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192 | char get_header_tar_lzma(archive_handle_t *archive_handle) FAST_FUNC;
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193 | char get_header_tar_xz(archive_handle_t *archive_handle) FAST_FUNC;
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194 |
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195 | void seek_by_jump(int fd, off_t amount) FAST_FUNC;
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196 | void seek_by_read(int fd, off_t amount) FAST_FUNC;
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197 |
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198 | const char *strip_unsafe_prefix(const char *str) FAST_FUNC;
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199 |
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200 | void data_align(archive_handle_t *archive_handle, unsigned boundary) FAST_FUNC;
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201 | const llist_t *find_list_entry(const llist_t *list, const char *filename) FAST_FUNC;
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202 | const llist_t *find_list_entry2(const llist_t *list, const char *filename) FAST_FUNC;
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203 |
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204 | /* A bit of bunzip2 internals are exposed for compressed help support: */
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205 | typedef struct bunzip_data bunzip_data;
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206 | int start_bunzip(bunzip_data **bdp, int in_fd, const void *inbuf, int len) FAST_FUNC;
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207 | /* NB: read_bunzip returns < 0 on error, or the number of *unfilled* bytes
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208 | * in outbuf. IOW: on EOF returns len ("all bytes are not filled"), not 0: */
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209 | int read_bunzip(bunzip_data *bd, char *outbuf, int len) FAST_FUNC;
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210 | void dealloc_bunzip(bunzip_data *bd) FAST_FUNC;
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211 |
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212 | /* Meaning and direction (input/output) of the fields are transformer-specific */
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213 | typedef struct transformer_state_t {
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214 | smallint signature_skipped; /* most often referenced member */
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215 |
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216 | IF_DESKTOP(long long) int FAST_FUNC (*xformer)(struct transformer_state_t *xstate);
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217 | USE_FOR_NOMMU(const char *xformer_prog;)
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218 |
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219 | /* Source */
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220 | int src_fd;
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221 | /* Output */
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222 | int dst_fd;
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223 | size_t mem_output_size_max; /* if non-zero, decompress to RAM instead of fd */
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224 | size_t mem_output_size;
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225 | char *mem_output_buf;
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226 |
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227 | off_t bytes_out;
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228 | off_t bytes_in; /* used in unzip code only: needs to know packed size */
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229 | uint32_t crc32;
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230 | time_t mtime; /* gunzip code may set this on exit */
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231 | } transformer_state_t;
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232 |
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233 | void init_transformer_state(transformer_state_t *xstate) FAST_FUNC;
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234 | ssize_t transformer_write(transformer_state_t *xstate, const void *buf, size_t bufsize) FAST_FUNC;
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235 | ssize_t xtransformer_write(transformer_state_t *xstate, const void *buf, size_t bufsize) FAST_FUNC;
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236 | int check_signature16(transformer_state_t *xstate, unsigned magic16) FAST_FUNC;
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237 |
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238 | IF_DESKTOP(long long) int inflate_unzip(transformer_state_t *xstate) FAST_FUNC;
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239 | IF_DESKTOP(long long) int unpack_Z_stream(transformer_state_t *xstate) FAST_FUNC;
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240 | IF_DESKTOP(long long) int unpack_gz_stream(transformer_state_t *xstate) FAST_FUNC;
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241 | IF_DESKTOP(long long) int unpack_bz2_stream(transformer_state_t *xstate) FAST_FUNC;
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242 | IF_DESKTOP(long long) int unpack_lzma_stream(transformer_state_t *xstate) FAST_FUNC;
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243 | IF_DESKTOP(long long) int unpack_xz_stream(transformer_state_t *xstate) FAST_FUNC;
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244 |
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245 | char* append_ext(char *filename, const char *expected_ext) FAST_FUNC;
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246 | int bbunpack(char **argv,
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247 | IF_DESKTOP(long long) int FAST_FUNC (*unpacker)(transformer_state_t *xstate),
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248 | char* FAST_FUNC (*make_new_name)(char *filename, const char *expected_ext),
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249 | const char *expected_ext
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250 | ) FAST_FUNC;
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251 |
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252 | void check_errors_in_children(int signo);
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253 | #if BB_MMU
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254 | void fork_transformer(int fd,
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255 | int signature_skipped,
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256 | IF_DESKTOP(long long) int FAST_FUNC (*transformer)(transformer_state_t *xstate)
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257 | ) FAST_FUNC;
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258 | #define fork_transformer_with_sig(fd, transformer, transform_prog) fork_transformer((fd), 0, (transformer))
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259 | #define fork_transformer_with_no_sig(fd, transformer) fork_transformer((fd), 1, (transformer))
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260 | #else
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261 | void fork_transformer(int fd, const char *transform_prog) FAST_FUNC;
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262 | #define fork_transformer_with_sig(fd, transformer, transform_prog) fork_transformer((fd), (transform_prog))
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263 | /* fork_transformer_with_no_sig() does not exist on NOMMU */
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264 | #endif
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265 |
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266 |
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267 | POP_SAVED_FUNCTION_VISIBILITY
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268 |
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269 | #endif
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