Aegisub/subprojects/csri/subhelp/win32/openfile.c
2021-01-10 03:14:12 -05:00

84 lines
2.6 KiB
C

/*****************************************************************************
* asa: portable digital subtitle renderer
*****************************************************************************
* Copyright (C) 2007 David Lamparter
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
****************************************************************************/
#include <windows.h>
#include <string.h>
#include "subhelp.h"
#include <csri/openerr.h>
csri_inst *subhelp_open_file(csri_rend *renderer,
csri_inst *(*memopenfunc)(csri_rend *renderer, const void *data,
size_t length, struct csri_openflag *flags),
const char *filename, struct csri_openflag *flags)
{
csri_inst *rv = NULL;
void *data;
struct csri_openflag *err;
HANDLE file, mapping;
DWORD size;
int namesize;
wchar_t *namebuf;
namesize = MultiByteToWideChar(CP_UTF8, 0, filename, -1, NULL, 0);
if (!namesize)
goto out_err;
namesize++;
namebuf = malloc(sizeof(wchar_t) * namesize);
MultiByteToWideChar(CP_UTF8, 0, filename, -1, namebuf, namesize);
file = CreateFileW(namebuf, GENERIC_READ, FILE_SHARE_READ,
NULL, OPEN_EXISTING, 0, NULL);
free(namebuf);
if (file == INVALID_HANDLE_VALUE)
goto out_err;
size = GetFileSize(file, NULL);
if (size == INVALID_FILE_SIZE || !size)
goto out_closefile;
mapping = CreateFileMappingW(file, NULL, PAGE_READONLY, 0, 0, NULL);
if (!mapping)
goto out_closefile;
data = MapViewOfFile(mapping, FILE_MAP_READ, 0, 0, size);
if (!data)
goto out_closemap;
rv = memopenfunc(renderer, data, size, flags);
UnmapViewOfFile(data);
CloseHandle(mapping);
CloseHandle(file);
return rv;
out_closemap:
CloseHandle(mapping);
out_closefile:
CloseHandle(file);
out_err:
for (err = flags; err; err = err->next)
if (!strcmp(err->name, CSRI_EXT_OPENERR))
break;
if (err) {
struct csri_openerr_flag *errd = err->data.otherval;
errd->flags = CSRI_OPENERR_FILLED | CSRI_OPENERR_WINERR;
errd->winerr = GetLastError();
}
return NULL;
}