platform/vfs.c: Redirect AppUser home dir

One less thing to require admin privileges.
This commit is contained in:
Tau 2019-09-02 17:12:04 -04:00
parent 3902757427
commit 29d9561a28

View File

@ -16,9 +16,17 @@
static void vfs_slashify(wchar_t *path, size_t max_count);
static HRESULT vfs_mkdir_rec(const wchar_t *path);
static HRESULT vfs_path_hook(const wchar_t *src, wchar_t *dest, size_t *count);
static HRESULT vfs_path_hook_nthome(
const wchar_t *src,
wchar_t *dest,
size_t *count);
static HRESULT vfs_reg_read_amfs(void *bytes, uint32_t *nbytes);
static HRESULT vfs_reg_read_appdata(void *bytes, uint32_t *nbytes);
static wchar_t vfs_nthome_real[MAX_PATH];
static const wchar_t vfs_nthome[] = L"C:\\Documents and Settings\\AppUser\\";
static const size_t vfs_nthome_len = _countof(vfs_nthome) - 1;
static const struct reg_hook_val vfs_reg_vals[] = {
{
.name = L"AMFS",
@ -35,6 +43,9 @@ static struct vfs_config vfs_config;
HRESULT vfs_hook_init(const struct vfs_config *config)
{
wchar_t temp[MAX_PATH];
size_t nthome_len;
DWORD home_ok;
HRESULT hr;
assert(config != NULL);
@ -43,10 +54,24 @@ HRESULT vfs_hook_init(const struct vfs_config *config)
return S_FALSE;
}
home_ok = GetEnvironmentVariableW(
L"USERPROFILE",
vfs_nthome_real,
_countof(vfs_nthome_real));
if (!home_ok) {
hr = HRESULT_FROM_WIN32(GetLastError());
dprintf("Vfs: Failed to query %%USERPROFILE%% env var: %x\n",
(int) hr);
return hr;
}
memcpy(&vfs_config, config, sizeof(*config));
vfs_slashify(vfs_config.amfs, _countof(vfs_config.amfs));
vfs_slashify(vfs_config.appdata, _countof(vfs_config.appdata));
vfs_slashify(vfs_nthome_real, _countof(vfs_nthome_real));
hr = vfs_mkdir_rec(vfs_config.amfs);
@ -66,12 +91,30 @@ HRESULT vfs_hook_init(const struct vfs_config *config)
dprintf("Vfs: NOTE: SEGA Y: drive APPDATA, not Windows %%APPDATA%%.\n");
}
/* Need to create the temp subdirectory, not just nthome itself */
nthome_len = wcslen(vfs_nthome_real);
wcscpy_s(temp, _countof(temp), vfs_nthome_real);
wcscpy_s(temp + nthome_len, _countof(temp) - nthome_len, L"temp");
hr = vfs_mkdir_rec(temp);
if (FAILED(hr)) {
dprintf("Vfs: Failed to create %S: %x\n", temp, (int) hr);
}
hr = path_hook_push(vfs_path_hook);
if (FAILED(hr)) {
return hr;
}
hr = path_hook_push(vfs_path_hook_nthome);
if (FAILED(hr)) {
return hr;
}
hr = reg_hook_push_key(
HKEY_LOCAL_MACHINE,
L"SYSTEM\\SEGA\\SystemProperty\\mount",
@ -206,6 +249,42 @@ static HRESULT vfs_path_hook(const wchar_t *src, wchar_t *dest, size_t *count)
return S_OK;
}
static HRESULT vfs_path_hook_nthome(
const wchar_t *src,
wchar_t *dest,
size_t *count)
{
size_t required;
size_t redir_len;
assert(src != NULL);
assert(count != NULL);
/* Case-insensitive check to see if src starts with vfs_nthome */
if (_wcsnicmp(src, vfs_nthome, vfs_nthome_len) != 0) {
return S_FALSE;
}
/* Cut off the matched prefix, add the replaced prefix, count NUL */
redir_len = wcslen(vfs_nthome_real);
required = wcslen(src) - vfs_nthome_len + redir_len + 1;
if (dest != NULL) {
if (required > *count) {
return HRESULT_FROM_WIN32(ERROR_INSUFFICIENT_BUFFER);
}
wcscpy_s(dest, *count, vfs_nthome_real);
wcscpy_s(dest + redir_len, *count - redir_len, src + vfs_nthome_len);
}
*count = required;
return S_OK;
}
static HRESULT vfs_reg_read_amfs(void *bytes, uint32_t *nbytes)
{
return reg_hook_read_wstr(bytes, nbytes, vfs_config.amfs);