archive_read_support_format_raw.c [plain text]
#include "archive_platform.h"
__FBSDID("$FreeBSD: head/lib/libarchive/archive_read_support_format_raw.c 201107 2009-12-28 03:25:33Z kientzle $");
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include "archive.h"
#include "archive_entry.h"
#include "archive_private.h"
#include "archive_read_private.h"
struct raw_info {
int64_t offset;
int end_of_file;
};
static int archive_read_format_raw_bid(struct archive_read *);
static int archive_read_format_raw_cleanup(struct archive_read *);
static int archive_read_format_raw_read_data(struct archive_read *,
const void **, size_t *, off_t *);
static int archive_read_format_raw_read_data_skip(struct archive_read *);
static int archive_read_format_raw_read_header(struct archive_read *,
struct archive_entry *);
int
archive_read_support_format_raw(struct archive *_a)
{
struct raw_info *info;
struct archive_read *a = (struct archive_read *)_a;
int r;
info = (struct raw_info *)calloc(1, sizeof(*info));
if (info == NULL) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate raw_info data");
return (ARCHIVE_FATAL);
}
r = __archive_read_register_format(a,
info,
"raw",
archive_read_format_raw_bid,
NULL,
archive_read_format_raw_read_header,
archive_read_format_raw_read_data,
archive_read_format_raw_read_data_skip,
archive_read_format_raw_cleanup);
if (r != ARCHIVE_OK)
free(info);
return (r);
}
static int
archive_read_format_raw_bid(struct archive_read *a)
{
if (__archive_read_ahead(a, 1, NULL) == NULL)
return (-1);
return (1);
}
static int
archive_read_format_raw_read_header(struct archive_read *a,
struct archive_entry *entry)
{
struct raw_info *info;
info = (struct raw_info *)(a->format->data);
if (info->end_of_file)
return (ARCHIVE_EOF);
a->archive.archive_format = ARCHIVE_FORMAT_RAW;
a->archive.archive_format_name = "Raw data";
archive_entry_set_pathname(entry, "data");
return (ARCHIVE_OK);
}
static int
archive_read_format_raw_read_data(struct archive_read *a,
const void **buff, size_t *size, off_t *offset)
{
struct raw_info *info;
ssize_t avail;
info = (struct raw_info *)(a->format->data);
if (info->end_of_file)
return (ARCHIVE_EOF);
*buff = __archive_read_ahead(a, 1, &avail);
if (avail > 0) {
__archive_read_consume(a, avail);
*size = avail;
*offset = info->offset;
info->offset += *size;
return (ARCHIVE_OK);
} else if (0 == avail) {
info->end_of_file = 1;
*size = 0;
*offset = info->offset;
return (ARCHIVE_EOF);
} else {
*size = 0;
*offset = info->offset;
return (avail);
}
}
static int
archive_read_format_raw_read_data_skip(struct archive_read *a)
{
struct raw_info *info;
off_t bytes_skipped;
int64_t request = 1024 * 1024 * 1024UL;
info = (struct raw_info *)(a->format->data);
if (info->end_of_file)
return (ARCHIVE_EOF);
info->end_of_file = 1;
for (;;) {
bytes_skipped = __archive_read_skip_lenient(a, request);
if (bytes_skipped < 0)
return (ARCHIVE_FATAL);
if (bytes_skipped < request)
return (ARCHIVE_OK);
}
}
static int
archive_read_format_raw_cleanup(struct archive_read *a)
{
struct raw_info *info;
info = (struct raw_info *)(a->format->data);
free(info);
a->format->data = NULL;
return (ARCHIVE_OK);
}