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/*
$NiH: zip_source_buffer.c,v 1.8 2007/04/23 14:50:49 wiz Exp $
zip_source_buffer.c -- create zip data source from buffer
Copyright (C) 1999-2008 Dieter Baron and Thomas Klausner
This file is part of libzip, a library to manipulate ZIP archives.
The authors can be contacted at <nih@giga.or.at>
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
3. The names of the authors may not be used to endorse or promote
products derived from this software without specific prior
written permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdlib.h>
#include <string.h>
#include "zip.h"
#include "zipint.h"
struct read_data {
const char *buf, *data, *end;
time_t mtime;
int freep;
};
static ssize_t read_data(void *state, void *data, size_t len,
enum zip_source_cmd cmd);
struct zip_source *
zip_source_buffer(struct zip *za, const void *data, off_t len, int freep)
{
struct read_data *f;
struct zip_source *zs;
if (za == NULL)
return NULL;
if (len < 0 || (data == NULL && len > 0)) {
_zip_error_set(&za->error, ZIP_ER_INVAL, 0);
return NULL;
}
if ((f=(struct read_data *)malloc(sizeof(*f))) == NULL) {
_zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
return NULL;
}
f->data = (const char *)data;
f->end = ((const char *)data)+len;
f->freep = freep;
f->mtime = time(NULL);
if ((zs=zip_source_function(za, read_data, f)) == NULL) {
free(f);
return NULL;
}
return zs;
}
static ssize_t
read_data(void *state, void *data, size_t len, enum zip_source_cmd cmd)
{
struct read_data *z;
char *buf;
size_t n;
z = (struct read_data *)state;
buf = (char *)data;
switch (cmd) {
case ZIP_SOURCE_OPEN:
z->buf = z->data;
return 0;
case ZIP_SOURCE_READ:
n = z->end - z->buf;
if (n > len)
n = len;
if (n < 0)
n = 0;
if (n) {
memcpy(buf, z->buf, n);
z->buf += n;
}
return n;
case ZIP_SOURCE_CLOSE:
return 0;
case ZIP_SOURCE_STAT:
{
struct zip_stat *st;
if (len < sizeof(*st))
return -1;
st = (struct zip_stat *)data;
zip_stat_init(st);
st->mtime = z->mtime;
st->size = z->end - z->data;
return sizeof(*st);
}
case ZIP_SOURCE_ERROR:
{
int *e;
if (len < sizeof(int)*2)
return -1;
e = (int *)data;
e[0] = e[1] = 0;
}
return sizeof(int)*2;
case ZIP_SOURCE_FREE:
if (z->freep) {
free((void *)z->data);
z->data = NULL;
}
free(z);
return 0;
default:
;
}
return -1;
}
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