xref: /PHP-5.3/ext/zip/lib/zip_source_buffer.c (revision 335a11b1)
1 /*
2   zip_source_buffer.c -- create zip data source from buffer
3   Copyright (C) 1999-2009 Dieter Baron and Thomas Klausner
4 
5   This file is part of libzip, a library to manipulate ZIP archives.
6   The authors can be contacted at <libzip@nih.at>
7 
8   Redistribution and use in source and binary forms, with or without
9   modification, are permitted provided that the following conditions
10   are met:
11   1. Redistributions of source code must retain the above copyright
12      notice, this list of conditions and the following disclaimer.
13   2. Redistributions in binary form must reproduce the above copyright
14      notice, this list of conditions and the following disclaimer in
15      the documentation and/or other materials provided with the
16      distribution.
17   3. The names of the authors may not be used to endorse or promote
18      products derived from this software without specific prior
19      written permission.
20 
21   THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
22   OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
23   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24   ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
25   DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
27   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
29   IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
30   OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
31   IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33 
34 
35 
36 #include <stdlib.h>
37 #include <string.h>
38 
39 #include "zipint.h"
40 
41 struct read_data {
42     const char *buf, *data, *end;
43     time_t mtime;
44     int freep;
45 };
46 
47 static zip_int64_t read_data(void *, void *, zip_uint64_t, enum zip_source_cmd);
48 
49 
50 
51 ZIP_EXTERN(struct zip_source *)
zip_source_buffer(struct zip * za,const void * data,zip_uint64_t len,int freep)52 zip_source_buffer(struct zip *za, const void *data, zip_uint64_t len, int freep)
53 {
54     struct read_data *f;
55     struct zip_source *zs;
56 
57     if (za == NULL)
58 	return NULL;
59 
60     if (data == NULL && len > 0) {
61 	_zip_error_set(&za->error, ZIP_ER_INVAL, 0);
62 	return NULL;
63     }
64 
65     if ((f=(struct read_data *)malloc(sizeof(*f))) == NULL) {
66 	_zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
67 	return NULL;
68     }
69 
70     f->data = (const char *)data;
71     f->end = ((const char *)data)+len;
72     f->freep = freep;
73     f->mtime = time(NULL);
74 
75     if ((zs=zip_source_function(za, read_data, f)) == NULL) {
76 	free(f);
77 	return NULL;
78     }
79 
80     return zs;
81 }
82 
83 
84 
85 static zip_int64_t
read_data(void * state,void * data,zip_uint64_t len,enum zip_source_cmd cmd)86 read_data(void *state, void *data, zip_uint64_t len, enum zip_source_cmd cmd)
87 {
88     struct read_data *z;
89     char *buf;
90     zip_uint64_t n;
91 
92     z = (struct read_data *)state;
93     buf = (char *)data;
94 
95     switch (cmd) {
96     case ZIP_SOURCE_OPEN:
97 	z->buf = z->data;
98 	return 0;
99 
100     case ZIP_SOURCE_READ:
101 	/* XXX: return error if (len > ZIP_INT64_MAX) */
102 
103 	n = z->end - z->buf;
104 	if (n > len)
105 	    n = len;
106 
107 	if (n) {
108 	    memcpy(buf, z->buf, n);
109 	    z->buf += n;
110 	}
111 
112 	return n;
113 
114     case ZIP_SOURCE_CLOSE:
115 	return 0;
116 
117     case ZIP_SOURCE_STAT:
118         {
119 	    struct zip_stat *st;
120 
121 	    if (len < sizeof(*st))
122 		return -1;
123 
124 	    st = (struct zip_stat *)data;
125 
126 	    zip_stat_init(st);
127 	    st->mtime = z->mtime;
128 	    st->size = z->end - z->data;
129 	    st->comp_size = st->size;
130 	    st->comp_method = ZIP_CM_STORE;
131 	    st->encryption_method = ZIP_EM_NONE;
132 	    st->valid = ZIP_STAT_MTIME|ZIP_STAT_SIZE|ZIP_STAT_COMP_SIZE
133 		|ZIP_STAT_COMP_METHOD|ZIP_STAT_ENCRYPTION_METHOD;
134 
135 	    return sizeof(*st);
136 	}
137 
138     case ZIP_SOURCE_ERROR:
139 	{
140 	    int *e;
141 
142 	    if (len < sizeof(int)*2)
143 		return -1;
144 
145 	    e = (int *)data;
146 	    e[0] = e[1] = 0;
147 	}
148 	return sizeof(int)*2;
149 
150     case ZIP_SOURCE_FREE:
151 	if (z->freep) {
152 	    free((void *)z->data);
153 	    z->data = NULL;
154 	}
155 	free(z);
156 	return 0;
157 
158     default:
159 	;
160     }
161 
162     return -1;
163 }
164