Aegisub/csri/lib/win32/enumerate.c

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/*****************************************************************************
* 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 <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "../csrilib.h"
#include "subhelp.h"
static void csrilib_enum_dir(const wchar_t *dir);
static const char *get_errstr()
{
static char msg[2048];
DWORD err = GetLastError();
if (!FormatMessageA(
FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, err, 0, msg, sizeof(msg), NULL))
strcpy(msg, "Unknown Error");
else {
size_t msglen = strlen(msg) - 1;
if (msg[msglen] == '\n')
msg[msglen] = '\0';
}
return msg;
}
static void csrilib_add(csri_rend *rend,
const struct csri_wrap_rend *tmp, struct csri_info *info)
{
struct csri_wrap_rend *wrend = (struct csri_wrap_rend *)
malloc(sizeof(struct csri_wrap_rend));
if (!wrend)
return;
memcpy(wrend, tmp, sizeof(struct csri_wrap_rend));
wrend->rend = rend;
wrend->info = info;
csrilib_rend_initadd(wrend);
}
static void csrilib_do_load(const wchar_t *filename)
{
HMODULE dlhandle = LoadLibraryExW(filename, NULL,
LOAD_WITH_ALTERED_SEARCH_PATH);
struct csri_wrap_rend tmp;
csri_rend *rend;
struct csri_info *(*renderer_info)(csri_rend *rend);
csri_rend *(*renderer_default)();
csri_rend *(*renderer_next)(csri_rend *prev);
const char *sym;
if (!dlhandle) {
subhelp_log(CSRI_LOG_WARNING, "LoadLibraryEx(\"%ls\") failed: "
"%s", filename, get_errstr());
return;
}
if (GetProcAddress(dlhandle, "csri_library")) {
subhelp_log(CSRI_LOG_WARNING, "ignoring library %ls",
filename);
goto out_freelib;
}
subhelp_log(CSRI_LOG_INFO, "loading %ls", filename);
tmp.os.dlhandle = dlhandle;
/* okay, this is uber-ugly. either I end up casting from void *
* to a fptr (which yields a cast warning), or I do a *(void **)&tmp.x
* (which yields a strict-aliasing warning).
* casting via char* works because char* can alias anything.
*/
#define _dl_map_function(x, dst) do { \
char *t1 = (char *)&dst; \
union x { FARPROC ptr; } *ptr = (union x *)t1; \
sym = "csri_" # x; \
ptr->ptr = GetProcAddress(dlhandle, sym);\
if (!ptr->ptr) goto out_dlfail; } while (0)
#define dl_map_function(x) _dl_map_function(x, tmp.x)
dl_map_function(query_ext);
subhelp_logging_pass((struct csri_logging_ext *)
tmp.query_ext(NULL, CSRI_EXT_LOGGING));
dl_map_function(open_file);
dl_map_function(open_mem);
dl_map_function(close);
dl_map_function(request_fmt);
dl_map_function(render);
#define dl_map_local(x) _dl_map_function(x, x)
dl_map_local(renderer_info);
dl_map_local(renderer_default);
dl_map_local(renderer_next);
rend = renderer_default();
while (rend) {
csrilib_add(rend, &tmp, renderer_info(rend));
rend = renderer_next(rend);
}
return;
out_dlfail:
subhelp_log(CSRI_LOG_WARNING, "%ls: symbol %s not found (%s)",
filename, sym, get_errstr());
out_freelib:
FreeLibrary(dlhandle);
}
static void csrilib_load(const wchar_t *filename)
{
DWORD attr = GetFileAttributesW(filename);
if (attr == INVALID_FILE_ATTRIBUTES)
return;
if (attr & FILE_ATTRIBUTE_DIRECTORY) {
csrilib_enum_dir(filename);
return;
}
csrilib_do_load(filename);
}
static void csrilib_enum_dir(const wchar_t *dir)
{
WIN32_FIND_DATAW data;
HANDLE res;
wchar_t buf[MAX_PATH];
_snwprintf(buf, sizeof(buf) / sizeof(buf[0]), L"%ls\\*", dir);
res = FindFirstFileW(buf, &data);
if (res == INVALID_HANDLE_VALUE) {
subhelp_log(CSRI_LOG_WARNING, "ignoring directory \"%ls\": %s",
dir, get_errstr());
return;
}
subhelp_log(CSRI_LOG_INFO, "scanning directory \"%ls\"", dir);
do {
if (data.cFileName[0] == '.')
continue;
_snwprintf(buf, sizeof(buf) / sizeof(buf[0]),
L"%ls\\%ls", dir, data.cFileName);
csrilib_load(buf);
} while (FindNextFileW(res, &data));
FindClose(res);
}
void csrilib_os_init()
{
wchar_t filename[MAX_PATH], *slash;
DWORD rv = GetModuleFileNameW(NULL, filename, MAX_PATH);
if (!rv)
*filename = L'\0';
slash = wcsrchr(filename, L'\\');
slash = slash ? slash + 1 : filename;
*slash = L'\0';
wcsncpy(slash, L"csri", filename + MAX_PATH - slash);
csrilib_enum_dir(filename);
}