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/*-
* Copyright (c) 2003-2007 Tim Kientzle
* Copyright (c) 2010-2011 Michihiro NAKAJIMA
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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 AUTHOR(S) 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 "archive_platform.h"
__FBSDID("$FreeBSD$");
#include "archive.h"
#include "archive_entry.h"
#include "archive_private.h"
#include "archive_entry_private.h"
/*
* sparse handling
*/
void
archive_entry_sparse_clear(struct archive_entry *entry)
{
struct ae_sparse *sp;
while (entry->sparse_head != NULL) {
sp = entry->sparse_head->next;
free(entry->sparse_head);
entry->sparse_head = sp;
}
entry->sparse_tail = NULL;
}
void
archive_entry_sparse_add_entry(struct archive_entry *entry,
int64_t offset, int64_t length)
{
struct ae_sparse *sp;
if (offset < 0 || length < 0)
/* Invalid value */
return;
if (offset > INT64_MAX - length ||
offset + length > archive_entry_size(entry))
/* A value of "length" parameter is too large. */
return;
if ((sp = entry->sparse_tail) != NULL) {
if (sp->offset + sp->length > offset)
/* Invalid value. */
return;
if (sp->offset + sp->length == offset) {
if (sp->offset + sp->length + length < 0)
/* A value of "length" parameter is
* too large. */
return;
/* Expand existing sparse block size. */
sp->length += length;
return;
}
}
if ((sp = (struct ae_sparse *)malloc(sizeof(*sp))) == NULL)
/* XXX Error XXX */
return;
sp->offset = offset;
sp->length = length;
sp->next = NULL;
if (entry->sparse_head == NULL)
entry->sparse_head = entry->sparse_tail = sp;
else {
/* Add a new sparse block to the tail of list. */
if (entry->sparse_tail != NULL)
entry->sparse_tail->next = sp;
entry->sparse_tail = sp;
}
}
/*
* returns number of the sparse entries
*/
int
archive_entry_sparse_count(struct archive_entry *entry)
{
struct ae_sparse *sp;
int count = 0;
for (sp = entry->sparse_head; sp != NULL; sp = sp->next)
count++;
/*
* Sanity check if this entry is exactly sparse.
* If amount of sparse blocks is just one and it indicates the whole
* file data, we should remove it and return zero.
*/
if (count == 1) {
sp = entry->sparse_head;
if (sp->offset == 0 &&
sp->length >= archive_entry_size(entry)) {
count = 0;
archive_entry_sparse_clear(entry);
}
}
return (count);
}
int
archive_entry_sparse_reset(struct archive_entry * entry)
{
entry->sparse_p = entry->sparse_head;
return archive_entry_sparse_count(entry);
}
int
archive_entry_sparse_next(struct archive_entry * entry,
int64_t *offset, int64_t *length)
{
if (entry->sparse_p) {
*offset = entry->sparse_p->offset;
*length = entry->sparse_p->length;
entry->sparse_p = entry->sparse_p->next;
return (ARCHIVE_OK);
} else {
*offset = 0;
*length = 0;
return (ARCHIVE_WARN);
}
}
/*
* end of sparse handling
*/
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