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/* 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)) {
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;
}
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