How does it work?

MagNumDB is a database that contains about 350,000 items. These items are constants, names, values all extracted from more than 6,000 header files (.h, .hxx, .hpp, .idl, etc.) provided by standard Windows and Visual Studio SDKs and WDKs.

Some values have been extracted from the very special uuid.lib file that contains the value of thousands of guids and property keys, not present anywhere else in header files. This can explain some duplicates (because names in uuid.lib are not always exactly the same as names in .h parsed files...).

It also contains around 36,0000 undocumented guids that we found ... meeeeep ...

 "C2P5"

To build this database, we have tried many existing parsers, things like CLANG or other fine tools, but they just don't suit our needs. They can't handle thousands of files that don't compile together, they can't handle some specific (or just very old) Microsoft constructs or annotations, they don't remember the stack of #define directives that led to a definition, they only give you a final AST, not a partial one, etc.

So, in the end, we have written a C/C++ parser named C2P5 (for C/CPP/PreProcessor/Parser), tailored specifically for computing constants. C2P5 is capable of preprocessing, parsing and partially evaluating all header files as if they were included in a one big virtual project (that of course, does not compile) on a 32G RAM machine. It currently supports the following preprocessor and C/C++ constructs:

  • #define preprocessor that define constants
  • #define preprocessor that define expression to compute constants
  • C and C++ constants, strings and enum definitions, and some level of pointerness
  • Special GUID constructs like DECLSPEC_UUID, DEFINE_GUIDSTRUCT, MIDL_INTERFACE, you name it
  • PROPERTYKEY constructs
  • Some IDL constructs
  • Etc.

The parser remembers dynamic preprocessor definitions (#if, #ifdef, etc.) that are conditions for constants definitions and expression computation. All parsed items are saved in the database, as well as the associated conditions. There may be more than one item corresponding to a given name, if there are differences in their associated conditions stack.

C2P5 supports the following types of constants, regardless of the way they are defined in source files:

  • integer, signed or unsigned, from 8-bit to 128-bit
  • floating point number, single (32-bit) or double (64-bit)
  • globally unique identifier, or guid, uuid, CLSID, IID, etc.
  • string, in narrow, wide, or utf-8/16/32 formats
  • character, in narrow, wide, or utf-8/16/32 formats
  • pointer, a constant cast as a pointer
  • property key, or PROPERTYKEY, or PKEY, a combination of a guid (fmtid) and a 32-bit integer (id).

 Powered by

C2P5 and this MagNumDB web site are written in C# and use a Lucene database as a full-text search engine. C2P5 uses a custom ANTLR4cs C grammar for expression parsing, not for preprocessor parsing.

 

 Frequently Asked Questions

  • Q: Can I run custom queries?
    A: Yes. You can use Lucene's query syntax. Note the Database is case insensitive. Check out the list of columns with their corresponding database column names:

    • Index: the item's index.
    • Name: the item's name, or title. For enum values, it's prefixed with the enum's name.
      Corresponding database field: title.
    • Type: the item's type, expressed in a specific, universal system.
      Corresponding database's field: valuetype, but use the value of the Storage type column for queries on items type.
    • Value: the item's value. For string values, it's displayed as is w/o quotes nor escaping.
      Corresponding database field: value. There is also a typedvalue field that can contain database's Int32, Int64, Float, Double or String typed values.
    • Hex Value: the item's hexadecimal value, only valid for integer types.
      There is no corresponding database field.
    • Signed Value: the item's signed value, only valid for integer and double types. Useful when you found a unsigned number and want to get the corresponding signed value (uint -> int for example).
      There is no corresponding database field.
    • Source lines(s): the source lines from which the item was extracted. Comments and characters such as TAB, CR are preserved.
      Corresponding database field: source.
    • File path: the file path from which the item was extracted, terminated by the line index.
      Corresponding database field: filepath. There are also directory and filename fields. filename is useful to query for values in a given file.
    • Score: Database's score value. Items are returned sorted by score.
    • Guid formats: a utility columns that proposes all possible guid formats. Only valid for guid types.
      There is no corresponding database field
    • Char type: the character encoding (narrow, wide, etc.). Only valid for char and string values.
      Corresponding database field: chartype.
    • Storage type: the exact storage type in the database. Only used for specific queries.
      Corresponding database field: valuetype.
    • Conditions: the list of preprocessor conditions for a given item. If a condition is surrounded with a REVERSE function, it means the reverse condition of what's surrounded was the condition.
      Corresponding database field: conditions. There may be multiple conditions fields for one item.

    Some important points to note:

    • If you search for a negative number (like error codes expressed using signed integers), you can surround the search with double quotes, for example searching for "-2147009290" is equivalent to searching for 0x80073CF6, 80073CF6 (or even 3CF6 in this specific case). If you don't surround negative numbers with double quotes, the system will search for signed and unsigned corresponding values.
    • The full-text search uses items' name, value, hex value, guid formats, source lines, etc. so refine your search if you get back too many items.
    • You can search for guid binary values using just a part of their full definition. For example, if you search for '79eac9c5', it will get you 3 guid entries
    • Leading wild card search (*whatever) is allowed, but it may slow down the search significantly.

    Here are some example or custom queries:

    title:wm_user returns the WM_USER Windows message item, not all items that reference the WM_USER token.

    title:wm_u* returns all items (Windows messages probably) whose name starts with WM_U*.

    value:1024 AND title:wm_* returns all items (Windows messages probably) whose name starts with WM_U* and value is 1024. Note AND must be UPPERCASE for database to understand it as an AND operator.

    value:"00000002-0000-0000-C000-000000000046" returns the IMalloc IID guid value.

  • Q: I always get back 400 items at most. Why?
    A: The MagNumDb site currently limits the number of returned items to this value by design. This should be enough for most real search scenarios (like enums with a big list of values).

  • Q: Some values are empty. Why?
    A: The expression evaluator cannot always compute the final value, because it sometimes require contextual information (custom defines, compiler architecture, etc.) that the parser doesn't have at parsing time. You can enable the Source line(s) column to check what's the corresponding source and try to work it out by yourself. The origin file path and line number is also included.

  • Q: Can I get all values for a given enum?
    A: Sure. For example, __VSHPROPID is the name of an enum, and a query like this: parent:__VSHPROPID will get all the enum's values (66 entries).

  • Q: I sometimes get back items whose name starts with "__magnumdb__enum_". Why?
    A: C allows unnamed enums. The MagNumDb parser just gives them a name, using the defining file name and a counter.

  • Q: I sometimes get back the same item/name twice or more with different values. For example:  TARGET_IS_NT60_OR_LATER. Why?
    A: This can be the case with defines. Their value may be different if they were surrounded by # directives (#if, #else, etc.) in the original source code. You can enable the Condition(s) column to check what are the corresponding conditions for a given item.
    Note: if a condition is surrounded with a funny REVERSE function token, it means the reverse condition of what's surrounded.

 Database Metrics

  • Last update date: Thursday May 13, 2020
  • Items count: 340878
  • Parsed files count: 8447
  • Windows SDK version: 10.0.19041.0
  • NetFx SDK version: 4.8
  • MSVC Tools version: 14.25.28610

 Rest API

There is a JSON version API (you will have to figure out the schema, it's pretty obvious) that you can call here (the search query is the 'q' parameter):

   https://www.magnumdb.com/api.aspx?q=0xC000000D&key=you-api-key-goes-here

Note this API also has a 400 items maximum limit and the server is monitored for excessive usage (the key can be removed without notice). If you want to get a key, send us an email.

 

 Contact

We welcome feedback.
Seen anything missing? A bug? A wrong value? Do you have any suggestion for improvements? Do you have an idea for a cool new feature?

Please contact us here

 About MagNumDB

MagNumDB  2017-2021 Simon Mourier V1.3.2. All rights reserved.

Profile for Simon Mourier at Stack Overflow, Q&A for professional and enthusiast programmers


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All values, names, source code fragments displayed here have been extracted from files that are property of their respective owners.

THIS SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND OTHER THAN AS SPECIFICALLY SET FORTH IN THE LICENSE AGREEMENT, INCLUDING WITHOUT LIMITATION WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Index Score Name Type Value Hex value Signed value Guid formats Char type Storage type Source line(s) File path Condition(s)
Index Score Name Type Value Hex value Signed value Guid formats Char type Storage type Source line(s) File path Condition(s)
1 5.671751 FILE_DEVICE_PARALLEL_PORT Int32 22 0x00000016 22 System.Int32
#define FILE_DEVICE_PARALLEL_PORT       0x00000016
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\um\winioctl.h(200,0)
2 4.010534 IOCTL_PAR_BASE Int32 22 0x00000016 22 System.Int32
#define IOCTL_PAR_BASE                  FILE_DEVICE_PARALLEL_PORT
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\shared\ntddpar.h(75,0)
  • If WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP | WINAPI_PARTITION_SYSTEM)
3 2.673689 IOCTL_PAR_QUERY_INFORMATION Int32 1441796 0x00160004 1441796 System.Int32
#define IOCTL_PAR_QUERY_INFORMATION     CTL_CODE(FILE_DEVICE_PARALLEL_PORT,1,METHOD_BUFFERED,FILE_ANY_ACCESS)
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\shared\ntddpar.h(76,0)
  • If WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP | WINAPI_PARTITION_SYSTEM)
4 2.673689 IOCTL_PAR_SET_INFORMATION Int32 1441800 0x00160008 1441800 System.Int32
#define IOCTL_PAR_SET_INFORMATION       CTL_CODE(FILE_DEVICE_PARALLEL_PORT,2,METHOD_BUFFERED,FILE_ANY_ACCESS)
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\shared\ntddpar.h(77,0)
  • If WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP | WINAPI_PARTITION_SYSTEM)
5 2.673689 IOCTL_PAR_QUERY_DEVICE_ID Int32 1441804 0x0016000C 1441804 System.Int32
#define IOCTL_PAR_QUERY_DEVICE_ID       CTL_CODE(FILE_DEVICE_PARALLEL_PORT,3,METHOD_BUFFERED,FILE_ANY_ACCESS)
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\shared\ntddpar.h(82,0)
  • If WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP | WINAPI_PARTITION_SYSTEM)
6 2.673689 IOCTL_PAR_QUERY_DEVICE_ID_SIZE Int32 1441808 0x00160010 1441808 System.Int32
#define IOCTL_PAR_QUERY_DEVICE_ID_SIZE  CTL_CODE(FILE_DEVICE_PARALLEL_PORT,4,METHOD_BUFFERED,FILE_ANY_ACCESS)
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\shared\ntddpar.h(88,0)
  • If WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP | WINAPI_PARTITION_SYSTEM)
7 2.673689 IOCTL_IEEE1284_GET_MODE Int32 1441812 0x00160014 1441812 System.Int32
#define IOCTL_IEEE1284_GET_MODE         CTL_CODE(FILE_DEVICE_PARALLEL_PORT, 5, METHOD_BUFFERED, FILE_ANY_ACCESS)
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\shared\ntddpar.h(90,0)
  • If WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP | WINAPI_PARTITION_SYSTEM)
8 2.673689 IOCTL_IEEE1284_NEGOTIATE Int32 1441816 0x00160018 1441816 System.Int32
#define IOCTL_IEEE1284_NEGOTIATE        CTL_CODE(FILE_DEVICE_PARALLEL_PORT, 6, METHOD_BUFFERED, FILE_ANY_ACCESS)
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\shared\ntddpar.h(91,0)
  • If WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP | WINAPI_PARTITION_SYSTEM)
9 2.673689 IOCTL_PAR_SET_WRITE_ADDRESS Int32 1441820 0x0016001C 1441820 System.Int32
#define IOCTL_PAR_SET_WRITE_ADDRESS     CTL_CODE(FILE_DEVICE_PARALLEL_PORT, 7, METHOD_BUFFERED, FILE_ANY_ACCESS)
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\shared\ntddpar.h(92,0)
  • If WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP | WINAPI_PARTITION_SYSTEM)
10 2.673689 IOCTL_PAR_SET_READ_ADDRESS Int32 1441824 0x00160020 1441824 System.Int32
#define IOCTL_PAR_SET_READ_ADDRESS      CTL_CODE(FILE_DEVICE_PARALLEL_PORT, 8, METHOD_BUFFERED, FILE_ANY_ACCESS)
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\shared\ntddpar.h(93,0)
  • If WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP | WINAPI_PARTITION_SYSTEM)
11 2.673689 IOCTL_PAR_GET_DEVICE_CAPS Int32 1441828 0x00160024 1441828 System.Int32
#define IOCTL_PAR_GET_DEVICE_CAPS       CTL_CODE(FILE_DEVICE_PARALLEL_PORT, 9, METHOD_BUFFERED, FILE_ANY_ACCESS)
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\shared\ntddpar.h(94,0)
  • If WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP | WINAPI_PARTITION_SYSTEM)
12 2.673689 IOCTL_PAR_GET_DEFAULT_MODES Int32 1441832 0x00160028 1441832 System.Int32
#define IOCTL_PAR_GET_DEFAULT_MODES     CTL_CODE(FILE_DEVICE_PARALLEL_PORT, 10, METHOD_BUFFERED, FILE_ANY_ACCESS)
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\shared\ntddpar.h(95,0)
  • If WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP | WINAPI_PARTITION_SYSTEM)
13 2.673689 IOCTL_PAR_PING Int32 1441836 0x0016002C 1441836 System.Int32
#define IOCTL_PAR_PING                  CTL_CODE(FILE_DEVICE_PARALLEL_PORT, 11, METHOD_BUFFERED, FILE_ANY_ACCESS)
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\shared\ntddpar.h(96,0)
  • If WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP | WINAPI_PARTITION_SYSTEM)
14 2.673689 IOCTL_PAR_QUERY_RAW_DEVICE_ID Int32 1441840 0x00160030 1441840 System.Int32
#define IOCTL_PAR_QUERY_RAW_DEVICE_ID   CTL_CODE(FILE_DEVICE_PARALLEL_PORT, 12, METHOD_BUFFERED, FILE_ANY_ACCESS)
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\shared\ntddpar.h(102,0)
  • If WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP | WINAPI_PARTITION_SYSTEM)
15 2.673689 IOCTL_PAR_ECP_HOST_RECOVERY Int32 1441844 0x00160034 1441844 System.Int32
#define IOCTL_PAR_ECP_HOST_RECOVERY     CTL_CODE(FILE_DEVICE_PARALLEL_PORT, 13, METHOD_BUFFERED, FILE_ANY_ACCESS)
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\shared\ntddpar.h(103,0)
  • If WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP | WINAPI_PARTITION_SYSTEM)
16 2.673689 IOCTL_PAR_GET_READ_ADDRESS Int32 1441848 0x00160038 1441848 System.Int32
#define IOCTL_PAR_GET_READ_ADDRESS      CTL_CODE(FILE_DEVICE_PARALLEL_PORT, 14, METHOD_BUFFERED, FILE_ANY_ACCESS)
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\shared\ntddpar.h(104,0)
  • If WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP | WINAPI_PARTITION_SYSTEM)
17 2.673689 IOCTL_PAR_GET_WRITE_ADDRESS Int32 1441852 0x0016003C 1441852 System.Int32
#define IOCTL_PAR_GET_WRITE_ADDRESS     CTL_CODE(FILE_DEVICE_PARALLEL_PORT, 15, METHOD_BUFFERED, FILE_ANY_ACCESS)
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\shared\ntddpar.h(105,0)
  • If WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP | WINAPI_PARTITION_SYSTEM)
18 2.673689 IOCTL_PAR_TEST Int32 1441872 0x00160050 1441872 System.Int32
#define IOCTL_PAR_TEST                  CTL_CODE(FILE_DEVICE_PARALLEL_PORT, 20, METHOD_BUFFERED, FILE_ANY_ACCESS)
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\shared\ntddpar.h(107,0)
  • If WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP | WINAPI_PARTITION_SYSTEM)
19 2.673689 IOCTL_PAR_IS_PORT_FREE Int32 1441876 0x00160054 1441876 System.Int32
#define IOCTL_PAR_IS_PORT_FREE          CTL_CODE(FILE_DEVICE_PARALLEL_PORT, 21, METHOD_BUFFERED, FILE_ANY_ACCESS)
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\shared\ntddpar.h(108,0)
  • If WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP | WINAPI_PARTITION_SYSTEM)
20 2.673689 IOCTL_PAR_QUERY_LOCATION Int32 1441880 0x00160058 1441880 System.Int32
#define IOCTL_PAR_QUERY_LOCATION        CTL_CODE(FILE_DEVICE_PARALLEL_PORT, 22, METHOD_BUFFERED, FILE_ANY_ACCESS)
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\shared\ntddpar.h(113,0)
  • If WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP | WINAPI_PARTITION_SYSTEM)
  • If (NTDDI_VERSION >= NTDDI_WINXP)