php-src/ext/zip/lib/zip_source_zip.c
2012-06-07 21:01:31 +02:00

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/*
zip_source_zip.c -- create data source from zip file
Copyright (C) 1999-2009 Dieter Baron and Thomas Klausner
This file is part of libzip, a library to manipulate ZIP archives.
The authors can be contacted at <libzip@nih.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 "zipint.h"
struct read_zip {
struct zip_file *zf;
struct zip_stat st;
zip_uint64_t off;
zip_int64_t len;
};
static zip_int64_t read_zip(void *st, void *data, zip_uint64_t len,
enum zip_source_cmd cmd);
ZIP_EXTERN(struct zip_source *)
zip_source_zip(struct zip *za, struct zip *srcza, zip_uint64_t srcidx,
int flags, zip_uint64_t start, zip_int64_t len)
{
struct zip_error error;
struct zip_source *zs;
struct read_zip *p;
/* XXX: ZIP_FL_RECOMPRESS */
if (za == NULL)
return NULL;
if (srcza == NULL || len < -1 || srcidx < 0 || srcidx >= srcza->nentry) {
_zip_error_set(&za->error, ZIP_ER_INVAL, 0);
return NULL;
}
if ((flags & ZIP_FL_UNCHANGED) == 0
&& ZIP_ENTRY_DATA_CHANGED(srcza->entry+srcidx)) {
_zip_error_set(&za->error, ZIP_ER_CHANGED, 0);
return NULL;
}
if (len == 0)
len = -1;
if (start == 0 && len == -1 && (flags & ZIP_FL_RECOMPRESS) == 0)
flags |= ZIP_FL_COMPRESSED;
else
flags &= ~ZIP_FL_COMPRESSED;
if ((p=(struct read_zip *)malloc(sizeof(*p))) == NULL) {
_zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
return NULL;
}
_zip_error_copy(&error, &srcza->error);
if (zip_stat_index(srcza, srcidx, flags, &p->st) < 0
|| (p->zf=zip_fopen_index(srcza, srcidx, flags)) == NULL) {
free(p);
_zip_error_copy(&za->error, &srcza->error);
_zip_error_copy(&srcza->error, &error);
return NULL;
}
p->off = start;
p->len = len;
if ((flags & ZIP_FL_COMPRESSED) == 0) {
p->st.size = p->st.comp_size = len;
p->st.comp_method = ZIP_CM_STORE;
p->st.crc = 0;
}
if ((zs=zip_source_function(za, read_zip, p)) == NULL) {
free(p);
return NULL;
}
return zs;
}
static zip_int64_t
read_zip(void *state, void *data, zip_uint64_t len, enum zip_source_cmd cmd)
{
struct read_zip *z;
char b[8192], *buf;
int i;
zip_uint64_t n;
z = (struct read_zip *)state;
buf = (char *)data;
switch (cmd) {
case ZIP_SOURCE_OPEN:
for (n=0; n<z->off; n+= i) {
i = (z->off-n > sizeof(b) ? sizeof(b) : z->off-n);
if ((i=zip_fread(z->zf, b, i)) < 0) {
zip_fclose(z->zf);
z->zf = NULL;
return -1;
}
}
return 0;
case ZIP_SOURCE_READ:
if (z->len != -1)
n = len > z->len ? z->len : len;
else
n = len;
if ((i=zip_fread(z->zf, buf, n)) < 0)
return -1;
if (z->len != -1)
z->len -= i;
return i;
case ZIP_SOURCE_CLOSE:
return 0;
case ZIP_SOURCE_STAT:
if (len < sizeof(z->st))
return -1;
len = sizeof(z->st);
memcpy(data, &z->st, len);
return len;
case ZIP_SOURCE_ERROR:
{
int *e;
if (len < sizeof(int)*2)
return -1;
e = (int *)data;
zip_file_error_get(z->zf, e, e+1);
}
return sizeof(int)*2;
case ZIP_SOURCE_FREE:
zip_fclose(z->zf);
free(z);
return 0;
default:
;
}
return -1;
}