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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* ostream.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "../internal.h"
#include "sqfs/io.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) {
fprintf(stderr, "%s: truncated write.\n", file->path);
return -1;
}
if (ret < 0) {
if (errno == EINTR)
continue;
perror(file->path);
return -1;
}
file->size += ret;
size -= ret;
data += ret;
}
return 0;
}
static int realize_sparse(file_ostream_t *file)
{
unsigned char *buffer;
size_t diff, bufsz;
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)
goto fail;
while (file->sparse_count > 0) {
diff = file->sparse_count > (off_t)bufsz ?
bufsz : (size_t)file->sparse_count;
if (write_all(file, buffer, diff)) {
free(buffer);
return -1;
}
file->sparse_count -= diff;
}
free(buffer);
} else {
if (lseek(file->fd, file->sparse_count, SEEK_CUR) == (off_t)-1)
goto fail;
if (ftruncate(file->fd, file->size) != 0)
goto fail;
file->sparse_count = 0;
}
return 0;
fail:
perror(file->path);
return -1;
}
static int file_append(sqfs_ostream_t *strm, const void *data, size_t size)
{
file_ostream_t *file = (file_ostream_t *)strm;
if (size == 0)
return 0;
if (data == NULL) {
file->sparse_count += size;
file->size += size;
return 0;
}
if (realize_sparse(file))
return -1;
return write_all(file, data, size);
}
static int file_flush(sqfs_ostream_t *strm)
{
file_ostream_t *file = (file_ostream_t *)strm;
if (realize_sparse(file))
return -1;
if (fsync(file->fd) != 0) {
if (errno == EINVAL)
return 0;
perror(file->path);
return -1;
}
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)
{
file_ostream_t *file = (file_ostream_t *)strm;
return file->path;
}
sqfs_ostream_t *ostream_open_handle(const char *path, int fd, int flags)
{
file_ostream_t *file = calloc(1, sizeof(*file));
sqfs_ostream_t *strm = (sqfs_ostream_t *)file;
if (file == NULL) {
perror(path);
return NULL;
}
sqfs_object_init(file, file_destroy, NULL);
file->path = strdup(path);
if (file->path == NULL) {
perror(path);
goto fail_free;
}
file->fd = dup(fd);
if (file->fd < 0) {
perror(path);
goto fail_path;
}
close(fd);
file->flags = flags;
strm->append = file_append;
strm->flush = file_flush;
strm->get_filename = file_get_filename;
return strm;
fail_path:
free(file->path);
fail_free:
free(file);
return NULL;
}
sqfs_ostream_t *ostream_open_file(const char *path, int flags)
{
sqfs_file_handle_t fd;
sqfs_ostream_t *out;
if (sqfs_open_native_file(&fd, path, flags)) {
perror(path);
return NULL;
}
out = ostream_open_handle(path, fd, flags);
if (out == NULL)
close(fd);
return out;
}
sqfs_ostream_t *ostream_open_stdout(void)
{
return ostream_open_handle("stdout", STDOUT_FILENO,
SQFS_FILE_OPEN_NO_SPARSE);
}
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