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-rw-r--r--lib/sqfs/win32/io_file.c170
1 files changed, 170 insertions, 0 deletions
diff --git a/lib/sqfs/win32/io_file.c b/lib/sqfs/win32/io_file.c
new file mode 100644
index 0000000..c3de1fd
--- /dev/null
+++ b/lib/sqfs/win32/io_file.c
@@ -0,0 +1,170 @@
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/*
+ * io_file.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 <stdlib.h>
+
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
+
+typedef struct {
+ sqfs_file_t base;
+
+ sqfs_u64 size;
+ HANDLE fd;
+} sqfs_file_stdio_t;
+
+
+static void stdio_destroy(sqfs_file_t *base)
+{
+ sqfs_file_stdio_t *file = (sqfs_file_stdio_t *)base;
+
+ CloseHandle(file->fd);
+ free(file);
+}
+
+static int stdio_read_at(sqfs_file_t *base, sqfs_u64 offset,
+ void *buffer, size_t size)
+{
+ sqfs_file_stdio_t *file = (sqfs_file_stdio_t *)base;
+ DWORD actually_read;
+ LARGE_INTEGER pos;
+
+ if (offset >= file->size)
+ return SQFS_ERROR_OUT_OF_BOUNDS;
+
+ if (size == 0)
+ return 0;
+
+ if ((offset + size - 1) >= file->size)
+ return SQFS_ERROR_OUT_OF_BOUNDS;
+
+ pos.QuadPart = offset;
+
+ if (!SetFilePointerEx(file->fd, pos, NULL, FILE_BEGIN))
+ return SQFS_ERROR_IO;
+
+ while (size > 0) {
+ if (!ReadFile(file->fd, buffer, size, &actually_read, NULL))
+ return SQFS_ERROR_IO;
+
+ size -= actually_read;
+ buffer = (char *)buffer + actually_read;
+ }
+
+ return 0;
+}
+
+static int stdio_write_at(sqfs_file_t *base, sqfs_u64 offset,
+ const void *buffer, size_t size)
+{
+ sqfs_file_stdio_t *file = (sqfs_file_stdio_t *)base;
+ DWORD actually_read;
+ LARGE_INTEGER pos;
+
+ if (size == 0)
+ return 0;
+
+ pos.QuadPart = offset;
+
+ if (!SetFilePointerEx(file->fd, pos, NULL, FILE_BEGIN))
+ return SQFS_ERROR_IO;
+
+ while (size > 0) {
+ if (!WriteFile(file->fd, buffer, size, &actually_read, NULL))
+ return SQFS_ERROR_IO;
+
+ size -= actually_read;
+ buffer = (char *)buffer + actually_read;
+ offset += actually_read;
+
+ if (offset > file->size)
+ file->size = offset;
+ }
+
+ return 0;
+}
+
+static sqfs_u64 stdio_get_size(const sqfs_file_t *base)
+{
+ const sqfs_file_stdio_t *file = (const sqfs_file_stdio_t *)base;
+
+ return file->size;
+}
+
+static int stdio_truncate(sqfs_file_t *base, sqfs_u64 size)
+{
+ sqfs_file_stdio_t *file = (sqfs_file_stdio_t *)base;
+ LARGE_INTEGER pos;
+
+ pos.QuadPart = size;
+
+ if (!SetFilePointerEx(file->fd, pos, NULL, FILE_BEGIN))
+ return SQFS_ERROR_IO;
+
+ if (!SetEndOfFile(file->fd))
+ return SQFS_ERROR_IO;
+
+ file->size = size;
+ return 0;
+}
+
+
+sqfs_file_t *sqfs_open_file(const char *filename, sqfs_u32 flags)
+{
+ int access_flags, creation_mode;
+ sqfs_file_stdio_t *file;
+ LARGE_INTEGER size;
+ sqfs_file_t *base;
+
+ if (flags & ~SQFS_FILE_OPEN_ALL_FLAGS)
+ return NULL;
+
+ file = calloc(1, sizeof(*file));
+ base = (sqfs_file_t *)file;
+ if (file == NULL)
+ return NULL;
+
+ if (flags & SQFS_FILE_OPEN_READ_ONLY) {
+ access_flags = GENERIC_READ;
+ creation_mode = OPEN_EXISTING;
+ } else {
+ access_flags = GENERIC_READ | GENERIC_WRITE;
+
+ if (flags & SQFS_FILE_OPEN_OVERWRITE) {
+ creation_mode = TRUNCATE_EXISTING;
+ } else {
+ creation_mode = CREATE_NEW;
+ }
+ }
+
+ file->fd = CreateFile(filename, access_flags, 0, NULL, creation_mode,
+ FILE_ATTRIBUTE_NORMAL, NULL);
+
+ if (file->fd == INVALID_HANDLE_VALUE) {
+ free(file);
+ return NULL;
+ }
+
+ if (!GetFileSizeEx(file->fd, &size)) {
+ free(file);
+ return NULL;
+ }
+
+ file->size = size.QuadPart;
+ base->destroy = stdio_destroy;
+ base->read_at = stdio_read_at;
+ base->write_at = stdio_write_at;
+ base->get_size = stdio_get_size;
+ base->truncate = stdio_truncate;
+ return base;
+}