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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
* ostream.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#define SQFS_BUILDING_DLL
#include "config.h"
#include "sqfs/io.h"
#include "sqfs/error.h"
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
typedef struct {
sqfs_ostream_t base;
char *path;
int flags;
int fd;
off_t sparse_count;
off_t size;
} file_ostream_t;
static int write_all(file_ostream_t *file, const sqfs_u8 *data, size_t size)
{
while (size > 0) {
ssize_t ret = write(file->fd, data, size);
if (ret == 0) {
errno = EPIPE;
return SQFS_ERROR_IO;
}
if (ret < 0) {
if (errno == EINTR)
continue;
return SQFS_ERROR_IO;
}
file->size += ret;
size -= ret;
data += ret;
}
return 0;
}
static int realize_sparse(file_ostream_t *file)
{
unsigned char *buffer;
size_t diff, bufsz;
int ret;
if (file->sparse_count == 0)
return 0;
if (file->flags & SQFS_FILE_OPEN_NO_SPARSE) {
bufsz = file->sparse_count > 1024 ? 1024 : file->sparse_count;
buffer = calloc(1, bufsz);
if (buffer == NULL)
return SQFS_ERROR_ALLOC;
while (file->sparse_count > 0) {
diff = file->sparse_count > (off_t)bufsz ?
bufsz : (size_t)file->sparse_count;
ret = write_all(file, buffer, diff);
if (ret) {
int temp = errno;
free(buffer);
errno = temp;
return ret;
}
file->sparse_count -= diff;
}
free(buffer);
} else {
if (lseek(file->fd, file->sparse_count, SEEK_CUR) == (off_t)-1)
return SQFS_ERROR_IO;
if (ftruncate(file->fd, file->size) != 0)
return SQFS_ERROR_IO;
file->sparse_count = 0;
}
return 0;
}
static int file_append(sqfs_ostream_t *strm, const void *data, size_t size)
{
file_ostream_t *file = (file_ostream_t *)strm;
int ret;
if (size == 0 || data == NULL) {
file->sparse_count += size;
file->size += size;
return 0;
}
ret = realize_sparse(file);
if (ret)
return ret;
return write_all(file, data, size);
}
static int file_flush(sqfs_ostream_t *strm)
{
file_ostream_t *file = (file_ostream_t *)strm;
int ret;
ret = realize_sparse(file);
if (ret)
return ret;
if (fsync(file->fd) != 0) {
if (errno != EINVAL)
return SQFS_ERROR_IO;
}
return 0;
}
static void file_destroy(sqfs_object_t *obj)
{
file_ostream_t *file = (file_ostream_t *)obj;
close(file->fd);
free(file->path);
free(file);
}
static const char *file_get_filename(sqfs_ostream_t *strm)
{
return ((file_ostream_t *)strm)->path;
}
int sqfs_ostream_open_handle(sqfs_ostream_t **out, const char *path,
sqfs_file_handle_t fd, sqfs_u32 flags)
{
file_ostream_t *file = calloc(1, sizeof(*file));
sqfs_ostream_t *strm = (sqfs_ostream_t *)file;
*out = NULL;
if (file == NULL)
return SQFS_ERROR_ALLOC;
sqfs_object_init(file, file_destroy, NULL);
file->path = strdup(path);
if (file->path == NULL) {
int temp = errno;
free(file);
errno = temp;
return SQFS_ERROR_ALLOC;
}
file->fd = dup(fd);
if (file->fd < 0) {
int temp = errno;
free(file->path);
free(file);
errno = temp;
return SQFS_ERROR_IO;
}
close(fd);
file->flags = flags;
strm->append = file_append;
strm->flush = file_flush;
strm->get_filename = file_get_filename;
*out = strm;
return 0;
}
int sqfs_ostream_open_file(sqfs_ostream_t **out, const char *path,
sqfs_u32 flags)
{
sqfs_file_handle_t fd;
int ret;
*out = NULL;
if (flags & SQFS_FILE_OPEN_READ_ONLY)
return SQFS_ERROR_ARG_INVALID;
ret = sqfs_open_native_file(&fd, path, flags);
if (ret)
return ret;
ret = sqfs_ostream_open_handle(out, path, fd, flags);
if (ret) {
int temp = errno;
close(fd);
errno = temp;
return ret;
}
return 0;
}
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