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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/istream.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/istream.c')
-rw-r--r--lib/fstream/win32/istream.c120
1 files changed, 120 insertions, 0 deletions
diff --git a/lib/fstream/win32/istream.c b/lib/fstream/win32/istream.c
new file mode 100644
index 0000000..96c9f1c
--- /dev/null
+++ b/lib/fstream/win32/istream.c
@@ -0,0 +1,120 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * istream.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "../internal.h"
+
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
+typedef struct {
+ istream_t base;
+ char *path;
+ HANDLE hnd;
+
+ sqfs_u8 buffer[BUFSZ];
+} file_istream_t;
+
+static int file_precache(istream_t *strm)
+{
+ file_istream_t *file = (file_istream_t *)strm;
+ DWORD diff, actual;
+ HANDLE hnd;
+
+ hnd = file->path == NULL ? GetStdHandle(STD_INPUT_HANDLE) : file->hnd;
+
+ while (strm->buffer_used < sizeof(file->buffer)) {
+ diff = sizeof(file->buffer) - strm->buffer_used;
+
+ if (!ReadFile(hnd, strm->buffer + strm->buffer_used,
+ diff, &actual, NULL)) {
+ w32_perror(file->path == NULL ? "stdin" : file->path);
+ return -1;
+ }
+
+ if (actual == 0) {
+ strm->eof = true;
+ break;
+ }
+
+ strm->buffer_used += actual;
+ }
+
+ return 0;
+}
+
+static const char *file_get_filename(istream_t *strm)
+{
+ file_istream_t *file = (file_istream_t *)strm;
+
+ return file->path == NULL ? "stdin" : file->path;
+}
+
+static void file_destroy(sqfs_object_t *obj)
+{
+ file_istream_t *file = (file_istream_t *)obj;
+
+ if (file->path != NULL) {
+ CloseHandle(file->hnd);
+ 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->hnd = CreateFile(path, GENERIC_READ, FILE_SHARE_READ, NULL,
+ OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
+
+ if (file->hnd == INVALID_HANDLE_VALUE) {
+ 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) {
+ perror("stdin");
+ return NULL;
+ }
+
+ strm->buffer = file->buffer;
+ strm->precache = file_precache;
+ strm->get_filename = file_get_filename;
+ obj->destroy = file_destroy;
+ return strm;
+}