Hugh McMaster : reg: Avoid using RegQueryInfoKey() to enumerate subkeys and values in the query operation.
Module: wine Branch: master Commit: fb22f6c416c6a95715866ff92a5454e1bc27e3c4 URL: http://source.winehq.org/git/wine.git/?a=commit;h=fb22f6c416c6a95715866ff92a... Author: Hugh McMaster <hugh.mcmaster(a)outlook.com> Date: Thu Jul 20 11:33:33 2017 +0000 reg: Avoid using RegQueryInfoKey() to enumerate subkeys and values in the query operation. Signed-off-by: Hugh McMaster <hugh.mcmaster(a)outlook.com> Signed-off-by: Alexandre Julliard <julliard(a)winehq.org> --- programs/reg/reg.c | 87 ++++++++++++++++++++++++++++++++---------------------- 1 file changed, 52 insertions(+), 35 deletions(-) diff --git a/programs/reg/reg.c b/programs/reg/reg.c index 0975acd..a6927d0 100644 --- a/programs/reg/reg.c +++ b/programs/reg/reg.c @@ -627,11 +627,13 @@ static WCHAR *build_subkey_path(WCHAR *path, DWORD path_len, WCHAR *subkey_name, static unsigned int num_values_found = 0; +#define MAX_SUBKEY_LEN 257 + static int query_value(HKEY key, WCHAR *value_name, WCHAR *path, BOOL recurse) { LONG rc; - DWORD num_subkeys, max_subkey_len, subkey_len; - DWORD max_data_bytes, data_size; + DWORD max_data_bytes = 2048, data_size; + DWORD subkey_len; DWORD type, path_len, i; BYTE *data; WCHAR fmt[] = {'%','1','\n',0}; @@ -639,14 +641,6 @@ static int query_value(HKEY key, WCHAR *value_name, WCHAR *path, BOOL recurse) WCHAR *subkey_name, *subkey_path; HKEY subkey; - rc = RegQueryInfoKeyW(key, NULL, NULL, NULL, &num_subkeys, &max_subkey_len, - NULL, NULL, NULL, &max_data_bytes, NULL, NULL); - if (rc) - { - ERR("RegQueryInfoKey failed: %d\n", rc); - return 1; - } - data = HeapAlloc(GetProcessHeap(), 0, max_data_bytes); if (!data) { @@ -654,8 +648,18 @@ static int query_value(HKEY key, WCHAR *value_name, WCHAR *path, BOOL recurse) return 1; } - data_size = max_data_bytes; - rc = RegQueryValueExW(key, value_name, NULL, &type, data, &data_size); + for (;;) + { + data_size = max_data_bytes; + rc = RegQueryValueExW(key, value_name, NULL, &type, data, &data_size); + if (rc == ERROR_MORE_DATA) + { + max_data_bytes = data_size; + data = HeapReAlloc(GetProcessHeap(), 0, data, max_data_bytes); + } + else break; + } + if (rc == ERROR_SUCCESS) { output_string(fmt, path); @@ -681,8 +685,7 @@ static int query_value(HKEY key, WCHAR *value_name, WCHAR *path, BOOL recurse) return 0; } - max_subkey_len++; - subkey_name = HeapAlloc(GetProcessHeap(), 0, max_subkey_len * sizeof(WCHAR)); + subkey_name = HeapAlloc(GetProcessHeap(), 0, MAX_SUBKEY_LEN * sizeof(WCHAR)); if (!subkey_name) { ERR("Failed to allocate memory for subkey_name\n"); @@ -691,9 +694,10 @@ static int query_value(HKEY key, WCHAR *value_name, WCHAR *path, BOOL recurse) path_len = strlenW(path); - for (i = 0; i < num_subkeys; i++) + i = 0; + for (;;) { - subkey_len = max_subkey_len; + subkey_len = MAX_SUBKEY_LEN; rc = RegEnumKeyExW(key, i, subkey_name, &subkey_len, NULL, NULL, NULL, NULL); if (rc == ERROR_SUCCESS) { @@ -704,7 +708,9 @@ static int query_value(HKEY key, WCHAR *value_name, WCHAR *path, BOOL recurse) RegCloseKey(subkey); } HeapFree(GetProcessHeap(), 0, subkey_path); + i++; } + else break; } HeapFree(GetProcessHeap(), 0, subkey_name); @@ -714,9 +720,9 @@ static int query_value(HKEY key, WCHAR *value_name, WCHAR *path, BOOL recurse) static int query_all(HKEY key, WCHAR *path, BOOL recurse) { LONG rc; - DWORD num_subkeys, max_subkey_len, subkey_len; - DWORD num_values, max_value_len, value_len; - DWORD max_data_bytes, data_size; + DWORD max_value_len = 256, value_len; + DWORD max_data_bytes = 2048, data_size; + DWORD subkey_len; DWORD i, type, path_len; WCHAR fmt[] = {'%','1','\n',0}; WCHAR fmt_path[] = {'%','1','\\','%','2','\n',0}; @@ -725,17 +731,8 @@ static int query_all(HKEY key, WCHAR *path, BOOL recurse) BYTE *data; HKEY subkey; - rc = RegQueryInfoKeyW(key, NULL, NULL, NULL, &num_subkeys, &max_subkey_len, NULL, - &num_values, &max_value_len, &max_data_bytes, NULL, NULL); - if (rc) - { - ERR("RegQueryInfoKey failed: %d\n", rc); - return 1; - } - output_string(fmt, path); - max_value_len++; value_name = HeapAlloc(GetProcessHeap(), 0, max_value_len * sizeof(WCHAR)); if (!value_name) { @@ -751,23 +748,40 @@ static int query_all(HKEY key, WCHAR *path, BOOL recurse) return 1; } - for (i = 0; i < num_values; i++) + i = 0; + for (;;) { value_len = max_value_len; data_size = max_data_bytes; rc = RegEnumValueW(key, i, value_name, &value_len, NULL, &type, data, &data_size); if (rc == ERROR_SUCCESS) + { output_value(value_name, type, data, data_size); + i++; + } + else if (rc == ERROR_MORE_DATA) + { + if (data_size > max_data_bytes) + { + max_data_bytes = data_size; + data = HeapReAlloc(GetProcessHeap(), 0, data, max_data_bytes); + } + else + { + max_value_len *= 2; + value_name = HeapReAlloc(GetProcessHeap(), 0, value_name, max_value_len); + } + } + else break; } HeapFree(GetProcessHeap(), 0, data); HeapFree(GetProcessHeap(), 0, value_name); - if (num_values || recurse) + if (i || recurse) output_string(newlineW); - max_subkey_len++; - subkey_name = HeapAlloc(GetProcessHeap(), 0, max_subkey_len * sizeof(WCHAR)); + subkey_name = HeapAlloc(GetProcessHeap(), 0, MAX_SUBKEY_LEN * sizeof(WCHAR)); if (!subkey_name) { ERR("Failed to allocate memory for subkey_name\n"); @@ -776,9 +790,10 @@ static int query_all(HKEY key, WCHAR *path, BOOL recurse) path_len = strlenW(path); - for (i = 0; i < num_subkeys; i++) + i = 0; + for (;;) { - subkey_len = max_subkey_len; + subkey_len = MAX_SUBKEY_LEN; rc = RegEnumKeyExW(key, i, subkey_name, &subkey_len, NULL, NULL, NULL, NULL); if (rc == ERROR_SUCCESS) { @@ -793,12 +808,14 @@ static int query_all(HKEY key, WCHAR *path, BOOL recurse) HeapFree(GetProcessHeap(), 0, subkey_path); } else output_string(fmt_path, path, subkey_name); + i++; } + else break; } HeapFree(GetProcessHeap(), 0, subkey_name); - if (num_subkeys && !recurse) + if (i && !recurse) output_string(newlineW); return 0;
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Alexandre Julliard