From 4b994ac359757098ebc09263fff9e2290a58de71 Mon Sep 17 00:00:00 2001 From: David Oberhollenzer Date: Sun, 13 Sep 2020 20:30:40 +0200 Subject: Implement a data writer based output stream Signed-off-by: David Oberhollenzer --- lib/common/data_writer_ostream.c | 91 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 91 insertions(+) create mode 100644 lib/common/data_writer_ostream.c (limited to 'lib/common/data_writer_ostream.c') diff --git a/lib/common/data_writer_ostream.c b/lib/common/data_writer_ostream.c new file mode 100644 index 0000000..94a04f2 --- /dev/null +++ b/lib/common/data_writer_ostream.c @@ -0,0 +1,91 @@ +/* SPDX-License-Identifier: GPL-3.0-or-later */ +/* + * data_writer_ostream.c + * + * Copyright (C) 2019 David Oberhollenzer + */ +#include "config.h" +#include "common.h" + +#include + +typedef struct{ + ostream_t base; + + sqfs_block_processor_t *proc; + const char *filename; +} data_writer_ostream_t; + +static int stream_append(ostream_t *base, const void *data, size_t size) +{ + data_writer_ostream_t *strm = (data_writer_ostream_t *)base; + int ret; + + ret = sqfs_block_processor_append(strm->proc, data, size); + + if (ret != 0) { + sqfs_perror(strm->filename, NULL, ret); + return -1; + } + + return 0; +} + +static int stream_flush(ostream_t *base) +{ + data_writer_ostream_t *strm = (data_writer_ostream_t *)base; + int ret; + + ret = sqfs_block_processor_end_file(strm->proc); + + if (ret != 0) { + sqfs_perror(strm->filename, NULL, ret); + return -1; + } + + return 0; +} + +static const char *stream_get_filename(ostream_t *base) +{ + data_writer_ostream_t *strm = (data_writer_ostream_t *)base; + + return strm->filename; +} + +static void stream_destroy(sqfs_object_t *base) +{ + free(base); +} + +ostream_t *data_writer_ostream_create(const char *filename, + sqfs_block_processor_t *proc, + sqfs_inode_generic_t **inode, + int flags) +{ + data_writer_ostream_t *strm = calloc(1, sizeof(*strm)); + sqfs_object_t *obj = (sqfs_object_t *)strm; + ostream_t *base = (ostream_t *)strm; + int ret; + + if (strm == NULL) { + perror(filename); + return NULL; + } + + ret = sqfs_block_processor_begin_file(proc, inode, NULL, flags); + + if (ret != 0) { + sqfs_perror(filename, NULL, ret); + free(strm); + return NULL; + } + + strm->proc = proc; + strm->filename = filename; + base->append = stream_append; + base->flush = stream_flush; + base->get_filename = stream_get_filename; + obj->destroy = stream_destroy; + return base; +} -- cgit v1.2.3