From 484cd01590ec488cca1f8a5c7c76cd223609e299 Mon Sep 17 00:00:00 2001
From: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Date: Thu, 15 Jun 2023 15:16:03 +0200
Subject: Migrate file istream/ostream from libio to libsquashfs

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
---
 lib/io/src/win32/istream.c | 173 ---------------------------------------------
 1 file changed, 173 deletions(-)
 delete mode 100644 lib/io/src/win32/istream.c

(limited to 'lib/io/src/win32/istream.c')

diff --git a/lib/io/src/win32/istream.c b/lib/io/src/win32/istream.c
deleted file mode 100644
index a09f3c3..0000000
--- a/lib/io/src/win32/istream.c
+++ /dev/null
@@ -1,173 +0,0 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
-/*
- * istream.c
- *
- * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
- */
-#include "../internal.h"
-#include "sqfs/io.h"
-#include "sqfs/error.h"
-
-#define WIN32_LEAN_AND_MEAN
-#include <windows.h>
-
-typedef struct {
-	sqfs_istream_t base;
-	char *path;
-	HANDLE hnd;
-
-	bool eof;
-	size_t buffer_offset;
-	size_t buffer_used;
-	sqfs_u8 buffer[BUFSZ];
-} file_istream_t;
-
-static int precache(sqfs_istream_t *strm)
-{
-	file_istream_t *file = (file_istream_t *)strm;
-	DWORD diff, actual;
-
-	if (file->eof)
-		return 0;
-
-	if (file->buffer_offset > 0 &&
-	    file->buffer_offset < file->buffer_used) {
-		memmove(file->buffer, file->buffer + file->buffer_offset,
-			file->buffer_used - file->buffer_offset);
-	}
-
-	file->buffer_used -= file->buffer_offset;
-	file->buffer_offset = 0;
-
-	while (file->buffer_used < sizeof(file->buffer)) {
-		diff = sizeof(file->buffer) - file->buffer_used;
-
-		if (!ReadFile(file->hnd, file->buffer + file->buffer_used,
-			      diff, &actual, NULL)) {
-			DWORD error = GetLastError();
-
-			if (error == ERROR_HANDLE_EOF ||
-			    error == ERROR_BROKEN_PIPE) {
-				file->eof = true;
-				break;
-			}
-
-			SetLastError(error);
-			return SQFS_ERROR_IO;
-		}
-
-		if (actual == 0) {
-			file->eof = true;
-			break;
-		}
-
-		file->buffer_used += actual;
-	}
-
-	return 0;
-}
-
-static int file_get_buffered_data(sqfs_istream_t *strm, const sqfs_u8 **out,
-				  size_t *size, size_t want)
-{
-	file_istream_t *file = (file_istream_t *)strm;
-
-	if (want > BUFSZ)
-		want = BUFSZ;
-
-	if (file->buffer_used == 0 ||
-	    (file->buffer_used - file->buffer_offset) < want) {
-		int ret = precache(strm);
-		if (ret)
-			return ret;
-	}
-
-	*out = file->buffer + file->buffer_offset;
-	*size = file->buffer_used - file->buffer_offset;
-	return (file->eof && *size == 0) ? 1 : 0;
-}
-
-static void file_advance_buffer(sqfs_istream_t *strm, size_t count)
-{
-	file_istream_t *file = (file_istream_t *)strm;
-
-	assert(count <= file->buffer_used);
-
-	file->buffer_offset += count;
-
-	assert(file->buffer_offset <= file->buffer_used);
-}
-
-static const char *file_get_filename(sqfs_istream_t *strm)
-{
-	return ((file_istream_t *)strm)->path;
-}
-
-static void file_destroy(sqfs_object_t *obj)
-{
-	file_istream_t *file = (file_istream_t *)obj;
-
-	CloseHandle(file->hnd);
-	free(file->path);
-	free(file);
-}
-
-int istream_open_handle(sqfs_istream_t **out, const char *path, HANDLE hnd)
-{
-	file_istream_t *file = calloc(1, sizeof(*file));
-	sqfs_istream_t *strm = (sqfs_istream_t *)file;
-	BOOL ret;
-
-	if (file == NULL)
-		return SQFS_ERROR_ALLOC;
-
-	sqfs_object_init(file, file_destroy, NULL);
-
-	file->path = strdup(path);
-	if (file->path == NULL) {
-		DWORD temp = GetLastError();
-		free(file);
-		SetLastError(temp);
-		return SQFS_ERROR_ALLOC;
-	}
-
-	ret = DuplicateHandle(GetCurrentProcess(), hnd,
-			      GetCurrentProcess(), &file->hnd,
-			      0, FALSE, DUPLICATE_SAME_ACCESS);
-	if (!ret) {
-		DWORD temp = GetLastError();
-		free(file->path);
-		free(file);
-		SetLastError(temp);
-		return SQFS_ERROR_IO;
-	}
-
-	CloseHandle(hnd);
-
-	strm->get_buffered_data = file_get_buffered_data;
-	strm->advance_buffer = file_advance_buffer;
-	strm->get_filename = file_get_filename;
-
-	*out = strm;
-	return 0;
-}
-
-int istream_open_file(sqfs_istream_t **out, const char *path)
-{
-	sqfs_file_handle_t hnd;
-	int ret;
-
-	ret = sqfs_open_native_file(&hnd, path, SQFS_FILE_OPEN_READ_ONLY);
-	if (ret)
-		return ret;
-
-	ret = istream_open_handle(out, path, hnd);
-	if (ret) {
-		DWORD temp = GetLastError();
-		CloseHandle(hnd);
-		SetLastError(temp);
-		return ret;
-	}
-
-	return 0;
-}
-- 
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