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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2020-09-04 18:26:16 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2020-09-16 09:34:35 +0200
commit1e255d0f6c472bb3c710aea1ea8dc5d27c0fba4a (patch)
tree0ba8dfc243a00ef955da973b1615a95498579525 /lib/fstream/unix
parentb96f0fc154feef531be76034bf6e38925636146f (diff)
Add stream I/O abstraction library
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'lib/fstream/unix')
-rw-r--r--lib/fstream/unix/istream.c124
-rw-r--r--lib/fstream/unix/ostream.c152
2 files changed, 276 insertions, 0 deletions
diff --git a/lib/fstream/unix/istream.c b/lib/fstream/unix/istream.c
new file mode 100644
index 0000000..5898141
--- /dev/null
+++ b/lib/fstream/unix/istream.c
@@ -0,0 +1,124 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * istream.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "../internal.h"
+
+typedef struct {
+ istream_t base;
+ char *path;
+ int fd;
+ bool eof;
+
+ sqfs_u8 buffer[BUFSZ];
+} file_istream_t;
+
+static int file_precache(istream_t *strm)
+{
+ file_istream_t *file = (file_istream_t *)strm;
+ ssize_t ret;
+ size_t diff;
+
+ while (strm->buffer_used < sizeof(file->buffer)) {
+ diff = sizeof(file->buffer) - strm->buffer_used;
+
+ ret = read(file->fd, strm->buffer + strm->buffer_used, diff);
+
+ if (ret == 0) {
+ file->eof = true;
+ break;
+ }
+
+ if (ret < 0) {
+ if (errno == EINTR)
+ continue;
+
+ perror(file->path);
+ return -1;
+ }
+
+ strm->buffer_used += ret;
+ }
+
+ return 0;
+}
+
+static const char *file_get_filename(istream_t *strm)
+{
+ file_istream_t *file = (file_istream_t *)strm;
+
+ return file->path;
+}
+
+static void file_destroy(sqfs_object_t *obj)
+{
+ file_istream_t *file = (file_istream_t *)obj;
+
+ if (file->fd != STDIN_FILENO)
+ close(file->fd);
+
+ free(file->path);
+ free(file);
+}
+
+istream_t *istream_open_file(const char *path)
+{
+ file_istream_t *file = calloc(1, sizeof(*file));
+ sqfs_object_t *obj = (sqfs_object_t *)file;
+ istream_t *strm = (istream_t *)file;
+
+ if (file == NULL) {
+ perror(path);
+ return NULL;
+ }
+
+ file->path = strdup(path);
+ if (file->path == NULL) {
+ perror(path);
+ goto fail_free;
+ }
+
+ file->fd = open(path, O_RDONLY);
+ if (file->fd < 0) {
+ perror(path);
+ goto fail_path;
+ }
+
+ strm->buffer = file->buffer;
+ strm->precache = file_precache;
+ strm->get_filename = file_get_filename;
+ obj->destroy = file_destroy;
+ return strm;
+fail_path:
+ free(file->path);
+fail_free:
+ free(file);
+ return NULL;
+}
+
+istream_t *istream_open_stdin(void)
+{
+ file_istream_t *file = calloc(1, sizeof(*file));
+ sqfs_object_t *obj = (sqfs_object_t *)file;
+ istream_t *strm = (istream_t *)file;
+
+ if (file == NULL)
+ goto fail;
+
+ file->path = strdup("stdin");
+ if (file->path == NULL)
+ goto fail;
+
+ file->fd = STDIN_FILENO;
+ strm->buffer = file->buffer;
+ strm->precache = file_precache;
+ strm->get_filename = file_get_filename;
+ obj->destroy = file_destroy;
+ return strm;
+fail:
+ perror("creating file wrapper for stdin");
+ free(file);
+ return NULL;
+}
diff --git a/lib/fstream/unix/ostream.c b/lib/fstream/unix/ostream.c
new file mode 100644
index 0000000..dac675f
--- /dev/null
+++ b/lib/fstream/unix/ostream.c
@@ -0,0 +1,152 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * ostream.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "../internal.h"
+
+typedef struct {
+ ostream_t base;
+ char *path;
+ int fd;
+} file_ostream_t;
+
+static int file_append(ostream_t *strm, const void *data, size_t size)
+{
+ file_ostream_t *file = (file_ostream_t *)strm;
+ ssize_t ret;
+
+ while (size > 0) {
+ ret = write(file->fd, data, size);
+
+ if (ret == 0) {
+ fprintf(stderr, "%s: truncated data write.\n",
+ file->path);
+ return -1;
+ }
+
+ if (ret < 0) {
+ if (errno == EINTR)
+ continue;
+
+ perror(file->path);
+ return -1;
+ }
+
+ size -= ret;
+ data = (const char *)data + ret;
+ }
+
+ return 0;
+}
+
+static int file_append_sparse(ostream_t *strm, size_t size)
+{
+ file_ostream_t *file = (file_ostream_t *)strm;
+
+ if (lseek(file->fd, size, SEEK_CUR) == (off_t)-1) {
+ perror(file->path);
+ return -1;
+ }
+
+ return 0;
+}
+
+static int file_flush(ostream_t *strm)
+{
+ file_ostream_t *file = (file_ostream_t *)strm;
+
+ if (fsync(file->fd) != 0) {
+ perror(file->path);
+ return -1;
+ }
+
+ return 0;
+}
+
+static void file_destroy(sqfs_object_t *obj)
+{
+ file_ostream_t *file = (file_ostream_t *)obj;
+
+ if (file->fd != STDOUT_FILENO)
+ close(file->fd);
+
+ free(file->path);
+ free(file);
+}
+
+static const char *file_get_filename(ostream_t *strm)
+{
+ file_ostream_t *file = (file_ostream_t *)strm;
+
+ return file->path;
+}
+
+ostream_t *ostream_open_file(const char *path, int flags)
+{
+ file_ostream_t *file = calloc(1, sizeof(*file));
+ sqfs_object_t *obj = (sqfs_object_t *)file;
+ ostream_t *strm = (ostream_t *)file;
+
+ if (file == NULL) {
+ perror(path);
+ return NULL;
+ }
+
+ file->path = strdup(path);
+ if (file->path == NULL) {
+ perror(path);
+ goto fail_free;
+ }
+
+ if (flags & OSTREAM_OPEN_OVERWRITE) {
+ file->fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
+ } else {
+ file->fd = open(path, O_WRONLY | O_CREAT | O_EXCL, 0644);
+ }
+
+ if (file->fd < 0) {
+ perror(path);
+ goto fail_path;
+ }
+
+ if (flags & OSTREAM_OPEN_SPARSE)
+ strm->append_sparse = file_append_sparse;
+
+ strm->append = file_append;
+ strm->flush = file_flush;
+ strm->get_filename = file_get_filename;
+ obj->destroy = file_destroy;
+ return strm;
+fail_path:
+ free(file->path);
+fail_free:
+ free(file);
+ return NULL;
+}
+
+ostream_t *ostream_open_stdout(void)
+{
+ file_ostream_t *file = calloc(1, sizeof(*file));
+ sqfs_object_t *obj = (sqfs_object_t *)file;
+ ostream_t *strm = (ostream_t *)file;
+
+ if (file == NULL)
+ goto fail;
+
+ file->path = strdup("stdout");
+ if (file->path == NULL)
+ goto fail;
+
+ file->fd = STDOUT_FILENO;
+ strm->append = file_append;
+ strm->flush = file_flush;
+ strm->get_filename = file_get_filename;
+ obj->destroy = file_destroy;
+ return strm;
+fail:
+ perror("creating file wrapper for stdout");
+ free(file);
+ return NULL;
+}