83bd0b76 |
1 | /* seekable zip */ |
2 | |
3 | #include "unzip.h" |
4 | |
5 | #include <stdlib.h> |
6 | #include <string.h> |
7 | #include <errno.h> |
8 | |
9 | #ifdef __SYMBIAN32__ |
10 | #include <ezlib.h> |
11 | #else |
12 | #include "zlib/zlib.h" |
13 | #endif |
14 | |
15 | |
16 | #define errormsg(str1,def,fname) printf("%s: " #def ": " str1 "\n", fname); |
17 | |
18 | |
19 | /* from gzio.c . Be careful with binary compatibility */ |
20 | typedef struct gz_stream { |
21 | z_stream stream; |
22 | int z_err; /* error code for last stream operation */ |
23 | int z_eof; /* set if end of input file */ |
24 | FILE *file; /* .gz file */ |
25 | Byte *inbuf; /* input buffer */ |
26 | Byte *outbuf; /* output buffer */ |
27 | uLong crc; /* crc32 of uncompressed data */ |
28 | char *msg; /* error message */ |
29 | char *path; /* path name for debugging only */ |
30 | int transparent; /* 1 if input file is not a .gz file */ |
31 | char mode; /* 'w' or 'r' */ |
32 | z_off_t start; /* start of compressed data in file (header skipped) */ |
33 | z_off_t in; /* bytes into deflate or inflate */ |
34 | z_off_t out; /* bytes out of deflate or inflate */ |
35 | int back; /* one character push-back */ |
36 | int last; /* true if push-back is last character */ |
37 | } gz_stream; |
38 | |
39 | #ifndef Z_BUFSIZE |
40 | # ifdef MAXSEG_64K |
41 | # define Z_BUFSIZE 4096 /* minimize memory usage for 16-bit DOS */ |
42 | # else |
43 | # define Z_BUFSIZE 16384 |
44 | # endif |
45 | #endif |
46 | #ifndef Z_PRINTF_BUFSIZE |
47 | # define Z_PRINTF_BUFSIZE 4096 |
48 | #endif |
49 | |
50 | #define ALLOC(size) malloc(size) |
51 | |
52 | int destroy OF((gz_stream *s)); |
53 | |
54 | |
55 | gzFile zip2gz(ZIP* zip, struct zipent* ent) |
56 | { |
57 | int err; |
58 | gz_stream *s; |
59 | const char *path; |
60 | int transparent = 0; |
61 | uInt len; |
62 | |
63 | if (!zip || !ent) |
64 | return NULL; |
65 | |
66 | /* zip stuff */ |
67 | if (ent->compression_method == 0x0000) |
68 | { |
69 | /* file is not compressed, simply stored */ |
70 | |
71 | /* check if size are equal */ |
72 | if (ent->compressed_size != ent->uncompressed_size) { |
73 | errormsg("Wrong uncompressed size in store compression", ERROR_CORRUPT,zip->zip); |
74 | return NULL; |
75 | } |
76 | |
77 | transparent = 1; |
78 | } |
79 | else if (ent->compression_method == 0x0008) |
80 | { |
81 | /* file is compressed using "Deflate" method */ |
82 | if (ent->version_needed_to_extract > 0x14) { |
83 | errormsg("Version too new", ERROR_UNSUPPORTED,zip->zip); |
84 | return NULL; |
85 | } |
86 | |
87 | if (ent->os_needed_to_extract != 0x00) { |
88 | errormsg("OS not supported", ERROR_UNSUPPORTED,zip->zip); |
89 | return NULL; |
90 | } |
91 | |
92 | if (ent->disk_number_start != zip->number_of_this_disk) { |
93 | errormsg("Cannot span disks", ERROR_UNSUPPORTED,zip->zip); |
94 | return NULL; |
95 | } |
96 | |
97 | } else { |
98 | errormsg("Compression method unsupported", ERROR_UNSUPPORTED, zip->zip); |
99 | return NULL; |
100 | } |
101 | |
102 | /* seek to compressed data */ |
103 | if (seekcompresszip(zip,ent) != 0) { |
104 | return NULL; |
105 | } |
106 | |
107 | path = zip->zip; |
108 | |
109 | /* normal gzip init for read */ |
110 | s = (gz_stream *)ALLOC(sizeof(gz_stream)); |
111 | if (!s) return Z_NULL; |
112 | |
113 | s->stream.zalloc = (alloc_func)0; |
114 | s->stream.zfree = (free_func)0; |
115 | s->stream.opaque = (voidpf)0; |
116 | s->stream.next_in = s->inbuf = Z_NULL; |
117 | s->stream.next_out = s->outbuf = Z_NULL; |
118 | s->stream.avail_in = s->stream.avail_out = 0; |
119 | s->file = NULL; |
120 | s->z_err = Z_OK; |
121 | s->z_eof = 0; |
122 | s->in = 0; |
123 | s->out = 0; |
124 | s->back = EOF; |
125 | s->crc = crc32(0L, Z_NULL, 0); |
126 | s->msg = NULL; |
127 | s->transparent = transparent; |
128 | s->mode = 'r'; |
129 | |
130 | s->path = (char*)ALLOC(strlen(path)+1); |
131 | if (s->path == NULL) { |
132 | return destroy(s), (gzFile)Z_NULL; |
133 | } |
134 | strcpy(s->path, path); /* do this early for debugging */ |
135 | |
136 | s->stream.next_in = s->inbuf = (Byte*)ALLOC(Z_BUFSIZE); |
137 | |
138 | err = inflateInit2(&(s->stream), -MAX_WBITS); |
139 | /* windowBits is passed < 0 to tell that there is no zlib header. |
140 | * Note that in this case inflate *requires* an extra "dummy" byte |
141 | * after the compressed stream in order to complete decompression and |
142 | * return Z_STREAM_END. Here the gzip CRC32 ensures that 4 bytes are |
143 | * present after the compressed stream. |
144 | */ |
145 | if (err != Z_OK || s->inbuf == Z_NULL) { |
146 | return destroy(s), (gzFile)Z_NULL; |
147 | } |
148 | s->stream.avail_out = Z_BUFSIZE; |
149 | |
150 | errno = 0; |
151 | s->file = zip->fp; |
152 | if (s->file == NULL) { |
153 | return destroy(s), (gzFile)Z_NULL; |
154 | } |
155 | |
156 | /* check_header(s); */ |
157 | errno = 0; |
158 | len = (uInt)fread(s->inbuf, 1, Z_BUFSIZE, s->file); |
159 | if (len == 0 && ferror(s->file)) s->z_err = Z_ERRNO; |
160 | s->stream.avail_in += len; |
161 | s->stream.next_in = s->inbuf; |
162 | if (s->stream.avail_in < 2) { |
163 | return destroy(s), (gzFile)Z_NULL; |
164 | } |
165 | |
166 | s->start = ftell(s->file) - s->stream.avail_in; |
167 | |
168 | return (gzFile)s; |
169 | } |
170 | |
171 | |
172 | int gzerror2(gzFile file) |
173 | { |
174 | gz_stream *s = (gz_stream*)file; |
175 | |
176 | if (s == NULL) |
177 | return Z_STREAM_ERROR; |
178 | |
179 | return s->z_err; |
180 | } |
181 | |
182 | |