archive_read_data_into_fd.c [plain text]
#include "archive_platform.h"
__FBSDID("$FreeBSD: src/lib/libarchive/archive_read_data_into_fd.c,v 1.16 2008/05/23 05:01:29 cperciva Exp $");
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "archive.h"
#include "archive_private.h"
#define MAX_WRITE (1024 * 1024)
int
archive_read_data_into_fd(struct archive *a, int fd)
{
int r;
const void *buff;
size_t size, bytes_to_write;
ssize_t bytes_written, total_written;
off_t offset;
off_t output_offset;
__archive_check_magic(a, ARCHIVE_READ_MAGIC, ARCHIVE_STATE_DATA, "archive_read_data_into_fd");
total_written = 0;
output_offset = 0;
while ((r = archive_read_data_block(a, &buff, &size, &offset)) ==
ARCHIVE_OK) {
const char *p = buff;
if (offset > output_offset) {
output_offset = lseek(fd,
offset - output_offset, SEEK_CUR);
if (output_offset != offset) {
archive_set_error(a, errno, "Seek error");
return (ARCHIVE_FATAL);
}
}
while (size > 0) {
bytes_to_write = size;
if (bytes_to_write > MAX_WRITE)
bytes_to_write = MAX_WRITE;
bytes_written = write(fd, p, bytes_to_write);
if (bytes_written < 0) {
archive_set_error(a, errno, "Write error");
return (ARCHIVE_FATAL);
}
output_offset += bytes_written;
total_written += bytes_written;
p += bytes_written;
size -= bytes_written;
}
}
if (r != ARCHIVE_EOF)
return (r);
return (ARCHIVE_OK);
}