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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/win32/ostream.c
parentb96f0fc154feef531be76034bf6e38925636146f (diff)
Add stream I/O abstraction library
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'lib/fstream/win32/ostream.c')
-rw-r--r--lib/fstream/win32/ostream.c189
1 files changed, 189 insertions, 0 deletions
diff --git a/lib/fstream/win32/ostream.c b/lib/fstream/win32/ostream.c
new file mode 100644
index 0000000..e593f7e
--- /dev/null
+++ b/lib/fstream/win32/ostream.c
@@ -0,0 +1,189 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * ostream.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "../internal.h"
+
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
+typedef struct {
+ ostream_t base;
+ char *path;
+ HANDLE hnd;
+} file_ostream_t;
+
+static int w32_append(HANDLE hnd, const char *filename,
+ const void *data, size_t size)
+{
+ DWORD diff;
+
+ while (size > 0) {
+ if (!WriteFile(hnd, data, size, &diff, NULL)) {
+ w32_perror(filename);
+ return -1;
+ }
+
+ size -= diff;
+ data = (const char *)data + diff;
+ }
+
+ return 0;
+}
+
+static int w32_flush(HANDLE hnd, const char *filename)
+{
+ if (FlushFileBuffers(hnd) != 0) {
+ w32_perror(filename);
+ return -1;
+ }
+
+ return 0;
+}
+
+/*****************************************************************************/
+
+static int file_append(ostream_t *strm, const void *data, size_t size)
+{
+ file_ostream_t *file = (file_ostream_t *)strm;
+
+ return w32_append(file->hnd, file->path, data, size);
+}
+
+static int file_append_sparse(ostream_t *strm, size_t size)
+{
+ file_ostream_t *file = (file_ostream_t *)strm;
+ LARGE_INTEGER pos;
+
+ pos.QuadPart = size;
+
+ if (!SetFilePointerEx(file->hnd, pos, NULL, FILE_CURRENT))
+ goto fail;
+
+ if (!SetEndOfFile(file->hnd))
+ goto fail;
+
+ return 0;
+fail:
+ w32_perror(file->path);
+ return -1;
+}
+
+static int file_flush(ostream_t *strm)
+{
+ file_ostream_t *file = (file_ostream_t *)strm;
+
+ return w32_flush(file->hnd, file->path);
+}
+
+static void file_destroy(sqfs_object_t *obj)
+{
+ file_ostream_t *file = (file_ostream_t *)obj;
+
+ CloseHandle(file->hnd);
+ 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;
+}
+
+/*****************************************************************************/
+
+static int stdout_append(ostream_t *strm, const void *data, size_t size)
+{
+ (void)strm;
+ return w32_append(GetStdHandle(STD_OUTPUT_HANDLE), "stdout",
+ data, size);
+}
+
+static int stdout_flush(ostream_t *strm)
+{
+ (void)strm;
+ return w32_flush(GetStdHandle(STD_OUTPUT_HANDLE), "stdout");
+}
+
+static void stdout_destroy(sqfs_object_t *obj)
+{
+ free(obj);
+}
+
+static const char *stdout_get_filename(ostream_t *strm)
+{
+ (void)strm;
+ return "stdout";
+}
+
+/*****************************************************************************/
+
+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;
+ int access_flags, creation_mode;
+
+ if (file == NULL) {
+ perror(path);
+ return NULL;
+ }
+
+ file->path = strdup(path);
+ if (file->path == NULL) {
+ perror(path);
+ goto fail_free;
+ }
+
+ access_flags = GENERIC_WRITE;
+
+ if (flags & OSTREAM_OPEN_OVERWRITE) {
+ creation_mode = CREATE_ALWAYS;
+ } else {
+ creation_mode = CREATE_NEW;
+ }
+
+ file->hnd = CreateFile(path, access_flags, 0, NULL, creation_mode,
+ FILE_ATTRIBUTE_NORMAL, NULL);
+
+ if (file->hnd == INVALID_HANDLE_VALUE) {
+ w32_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)
+{
+ ostream_t *strm = calloc(1, sizeof(strm));
+ sqfs_object_t *obj = (sqfs_object_t *)strm;
+
+ if (strm == NULL) {
+ perror("creating stdout file wrapper");
+ return NULL;
+ }
+
+ strm->append = stdout_append;
+ strm->flush = stdout_flush;
+ strm->get_filename = stdout_get_filename;
+ obj->destroy = stdout_destroy;
+ return strm;
+}