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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 "compat.h"
#include <stdlib.h>
#include <string.h>
#include <errno.h>
typedef struct {
sqfs_ostream_t base;
char *path;
sqfs_u32 flags;
sqfs_file_handle_t fd;
sqfs_u64 sparse_count;
sqfs_u64 size;
} file_ostream_t;
static int write_all(file_ostream_t *file, const sqfs_u8 *data, size_t size)
{
while (size > 0) {
#if defined(_WIN32) || defined(__WINDOWS__)
DWORD ret;
if (!WriteFile(file->fd, data, size, &ret, NULL))
return SQFS_ERROR_IO;
#else
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;
}
#endif
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 > bufsz ?
bufsz : file->sparse_count;
ret = write_all(file, buffer, diff);
if (ret) {
os_error_t err = get_os_error_state();
free(buffer);
set_os_error_state(err);
return ret;
}
file->sparse_count -= diff;
}
free(buffer);
} else {
ret = sqfs_native_file_seek(file->fd, file->sparse_count,
SQFS_FILE_SEEK_CURRENT |
SQFS_FILE_SEEK_TRUNCATE);
if (ret)
return ret;
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 defined(_WIN32) || defined(__WINDOWS__)
if (!FlushFileBuffers(file->fd))
return SQFS_ERROR_IO;
#else
if (fsync(file->fd) != 0 && errno != EINVAL)
return SQFS_ERROR_IO;
#endif
return 0;
}
static void file_destroy(sqfs_object_t *obj)
{
file_ostream_t *file = (file_ostream_t *)obj;
sqfs_native_file_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;
sqfs_ostream_t *strm;
int ret;
*out = NULL;
if (flags & ~(SQFS_FILE_OPEN_ALL_FLAGS))
return SQFS_ERROR_UNSUPPORTED;
file = calloc(1, sizeof(*file));
strm = (sqfs_ostream_t *)file;
if (file == NULL)
return SQFS_ERROR_ALLOC;
sqfs_object_init(file, file_destroy, NULL);
file->path = strdup(path);
if (file->path == NULL) {
os_error_t err = get_os_error_state();
free(file);
set_os_error_state(err);
return SQFS_ERROR_ALLOC;
}
ret = sqfs_native_file_duplicate(fd, &file->fd);
if (ret) {
os_error_t err = get_os_error_state();
free(file->path);
free(file);
set_os_error_state(err);
return ret;
}
sqfs_native_file_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_native_file_open(&fd, path, flags);
if (ret)
return ret;
ret = sqfs_ostream_open_handle(out, path, fd, flags);
if (ret) {
os_error_t err = get_os_error_state();
sqfs_native_file_close(fd);
set_os_error_state(err);
return ret;
}
return 0;
}
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