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/* 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;
bool readonly;
sqfs_u64 size;
HANDLE fd;
} sqfs_file_stdio_t;
static void stdio_destroy(sqfs_object_t *base)
{
sqfs_file_stdio_t *file = (sqfs_file_stdio_t *)base;
CloseHandle(file->fd);
free(file);
}
static sqfs_object_t *stdio_copy(const sqfs_object_t *base)
{
const sqfs_file_stdio_t *file = (const sqfs_file_stdio_t *)base;
sqfs_file_stdio_t *copy;
BOOL ret;
if (!file->readonly) {
SetLastError(ERROR_NOT_SUPPORTED);
return NULL;
}
copy = calloc(1, sizeof(*copy));
if (copy == NULL)
return NULL;
memcpy(copy, file, sizeof(*file));
ret = DuplicateHandle(GetCurrentProcess(), file->fd,
GetCurrentProcess(), ©->fd,
0, FALSE, DUPLICATE_SAME_ACCESS);
if (!ret) {
free(copy);
return NULL;
}
return (sqfs_object_t *)copy;
}
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) {
file->readonly = true;
access_flags = GENERIC_READ;
creation_mode = OPEN_EXISTING;
} else {
file->readonly = false;
access_flags = GENERIC_READ | GENERIC_WRITE;
if (flags & SQFS_FILE_OPEN_OVERWRITE) {
creation_mode = CREATE_ALWAYS;
} 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->read_at = stdio_read_at;
base->write_at = stdio_write_at;
base->get_size = stdio_get_size;
base->truncate = stdio_truncate;
((sqfs_object_t *)base)->destroy = stdio_destroy;
((sqfs_object_t *)base)->copy = stdio_copy;
return base;
}
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