archive_read_open_filename.c [plain text]
#include "archive_platform.h"
__FBSDID("$FreeBSD: head/lib/libarchive/archive_read_open_filename.c 201093 2009-12-28 02:28:44Z kientzle $");
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_IO_H
#include <io.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "archive.h"
#ifndef O_BINARY
#define O_BINARY 0
#endif
struct read_file_data {
int fd;
size_t block_size;
void *buffer;
mode_t st_mode;
char can_skip;
char filename[1];
};
static int file_close(struct archive *, void *);
static ssize_t file_read(struct archive *, void *, const void **buff);
#if ARCHIVE_API_VERSION < 2
static ssize_t file_skip(struct archive *, void *, size_t request);
#else
static off_t file_skip(struct archive *, void *, off_t request);
#endif
int
archive_read_open_file(struct archive *a, const char *filename,
size_t block_size)
{
return (archive_read_open_filename(a, filename, block_size));
}
int
archive_read_open_filename(struct archive *a, const char *filename,
size_t block_size)
{
struct stat st;
struct read_file_data *mine;
void *b;
int fd;
archive_clear_error(a);
if (filename == NULL || filename[0] == '\0') {
filename = "";
fd = 0;
#if defined(__CYGWIN__) || defined(_WIN32)
setmode(0, O_BINARY);
#endif
} else {
fd = open(filename, O_RDONLY | O_BINARY);
if (fd < 0) {
archive_set_error(a, errno,
"Failed to open '%s'", filename);
return (ARCHIVE_FATAL);
}
}
if (fstat(fd, &st) != 0) {
archive_set_error(a, errno, "Can't stat '%s'", filename);
return (ARCHIVE_FATAL);
}
mine = (struct read_file_data *)calloc(1,
sizeof(*mine) + strlen(filename));
b = malloc(block_size);
if (mine == NULL || b == NULL) {
archive_set_error(a, ENOMEM, "No memory");
free(mine);
free(b);
return (ARCHIVE_FATAL);
}
strcpy(mine->filename, filename);
mine->block_size = block_size;
mine->buffer = b;
mine->fd = fd;
mine->st_mode = st.st_mode;
if (S_ISREG(st.st_mode)) {
archive_read_extract_set_skip_file(a, st.st_dev, st.st_ino);
mine->can_skip = 1;
}
return (archive_read_open2(a, mine,
NULL, file_read, file_skip, file_close));
}
static ssize_t
file_read(struct archive *a, void *client_data, const void **buff)
{
struct read_file_data *mine = (struct read_file_data *)client_data;
ssize_t bytes_read;
*buff = mine->buffer;
bytes_read = read(mine->fd, mine->buffer, mine->block_size);
if (bytes_read < 0) {
if (mine->filename[0] == '\0')
archive_set_error(a, errno, "Error reading stdin");
else
archive_set_error(a, errno, "Error reading '%s'",
mine->filename);
}
return (bytes_read);
}
#if ARCHIVE_API_VERSION < 2
static ssize_t
file_skip(struct archive *a, void *client_data, size_t request)
#else
static off_t
file_skip(struct archive *a, void *client_data, off_t request)
#endif
{
struct read_file_data *mine = (struct read_file_data *)client_data;
off_t old_offset, new_offset;
if (!mine->can_skip)
return (0);
request = (request / mine->block_size) * mine->block_size;
if (request == 0)
return (0);
if (((old_offset = lseek(mine->fd, 0, SEEK_CUR)) < 0) ||
((new_offset = lseek(mine->fd, request, SEEK_CUR)) < 0))
{
mine->can_skip = 0;
if (errno == ESPIPE)
{
return (0);
}
if (mine->filename[0] == '\0')
archive_set_error(a, errno, "Error seeking in stdin");
else
archive_set_error(a, errno, "Error seeking in '%s'",
mine->filename);
return (-1);
}
return (new_offset - old_offset);
}
static int
file_close(struct archive *a, void *client_data)
{
struct read_file_data *mine = (struct read_file_data *)client_data;
(void)a;
if (mine->fd >= 0) {
if (!S_ISREG(mine->st_mode)
&& !S_ISCHR(mine->st_mode)
&& !S_ISBLK(mine->st_mode)) {
ssize_t bytesRead;
do {
bytesRead = read(mine->fd, mine->buffer,
mine->block_size);
} while (bytesRead > 0);
}
if (mine->filename[0] != '\0')
close(mine->fd);
}
free(mine->buffer);
free(mine);
return (ARCHIVE_OK);
}