ICU 50.1.2
50.1.2
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Unicode Security and Spoofing Detection, C API. More...
#include "unicode/utypes.h"
#include "unicode/uset.h"
#include "unicode/parseerr.h"
#include "unicode/localpointer.h"
#include "unicode/unistr.h"
#include "unicode/uniset.h"
Go to the source code of this file.
Namespaces | |
icu | |
File coll.h. | |
Typedefs | |
typedef struct USpoofChecker | USpoofChecker |
typedef for C of USpoofChecker | |
typedef enum USpoofChecks | USpoofChecks |
Enum for the kinds of checks that USpoofChecker can perform. More... | |
Enumerations | |
enum | USpoofChecks { USPOOF_SINGLE_SCRIPT_CONFUSABLE = 1, USPOOF_MIXED_SCRIPT_CONFUSABLE = 2, USPOOF_WHOLE_SCRIPT_CONFUSABLE = 4, USPOOF_ANY_CASE = 8, USPOOF_SINGLE_SCRIPT = 16, USPOOF_INVISIBLE = 32, USPOOF_CHAR_LIMIT = 64, USPOOF_ALL_CHECKS = 0x7f } |
Enum for the kinds of checks that USpoofChecker can perform. More... | |
Functions | |
USpoofChecker * | uspoof_open (UErrorCode *status) |
Create a Unicode Spoof Checker, configured to perform all checks except for USPOOF_LOCALE_LIMIT and USPOOF_CHAR_LIMIT. More... | |
USpoofChecker * | uspoof_openFromSerialized (const void *data, int32_t length, int32_t *pActualLength, UErrorCode *pErrorCode) |
Open a Spoof checker from its serialized from, stored in 32-bit-aligned memory. More... | |
USpoofChecker * | uspoof_openFromSource (const char *confusables, int32_t confusablesLen, const char *confusablesWholeScript, int32_t confusablesWholeScriptLen, int32_t *errType, UParseError *pe, UErrorCode *status) |
Open a Spoof Checker from the source form of the spoof data. More... | |
void | uspoof_close (USpoofChecker *sc) |
Close a Spoof Checker, freeing any memory that was being held by its implementation. More... | |
USpoofChecker * | uspoof_clone (const USpoofChecker *sc, UErrorCode *status) |
Clone a Spoof Checker. More... | |
void | uspoof_setChecks (USpoofChecker *sc, int32_t checks, UErrorCode *status) |
Specify the set of checks that will be performed by the check functions of this Spoof Checker. More... | |
int32_t | uspoof_getChecks (const USpoofChecker *sc, UErrorCode *status) |
Get the set of checks that this Spoof Checker has been configured to perform. More... | |
void | uspoof_setAllowedLocales (USpoofChecker *sc, const char *localesList, UErrorCode *status) |
Limit characters that are acceptable in identifiers being checked to those normally used with the languages associated with the specified locales. More... | |
const char * | uspoof_getAllowedLocales (USpoofChecker *sc, UErrorCode *status) |
Get a list of locales for the scripts that are acceptable in strings to be checked. More... | |
void | uspoof_setAllowedChars (USpoofChecker *sc, const USet *chars, UErrorCode *status) |
Limit the acceptable characters to those specified by a Unicode Set. More... | |
const USet * | uspoof_getAllowedChars (const USpoofChecker *sc, UErrorCode *status) |
Get a USet for the characters permitted in an identifier. More... | |
void | uspoof_setAllowedUnicodeSet (USpoofChecker *sc, const icu::UnicodeSet *chars, UErrorCode *status) |
Limit the acceptable characters to those specified by a Unicode Set. More... | |
const icu::UnicodeSet * | uspoof_getAllowedUnicodeSet (const USpoofChecker *sc, UErrorCode *status) |
Get a UnicodeSet for the characters permitted in an identifier. More... | |
int32_t | uspoof_check (const USpoofChecker *sc, const UChar *text, int32_t length, int32_t *position, UErrorCode *status) |
Check the specified string for possible security issues. More... | |
int32_t | uspoof_checkUTF8 (const USpoofChecker *sc, const char *text, int32_t length, int32_t *position, UErrorCode *status) |
Check the specified string for possible security issues. More... | |
int32_t | uspoof_checkUnicodeString (const USpoofChecker *sc, const icu::UnicodeString &text, int32_t *position, UErrorCode *status) |
Check the specified string for possible security issues. More... | |
int32_t | uspoof_areConfusable (const USpoofChecker *sc, const UChar *s1, int32_t length1, const UChar *s2, int32_t length2, UErrorCode *status) |
Check the whether two specified strings are visually confusable. More... | |
int32_t | uspoof_areConfusableUTF8 (const USpoofChecker *sc, const char *s1, int32_t length1, const char *s2, int32_t length2, UErrorCode *status) |
Check the whether two specified strings are visually confusable. More... | |
int32_t | uspoof_areConfusableUnicodeString (const USpoofChecker *sc, const icu::UnicodeString &s1, const icu::UnicodeString &s2, UErrorCode *status) |
Check the whether two specified strings are visually confusable. More... | |
int32_t | uspoof_getSkeleton (const USpoofChecker *sc, uint32_t type, const UChar *s, int32_t length, UChar *dest, int32_t destCapacity, UErrorCode *status) |
Get the "skeleton" for an identifier string. More... | |
int32_t | uspoof_getSkeletonUTF8 (const USpoofChecker *sc, uint32_t type, const char *s, int32_t length, char *dest, int32_t destCapacity, UErrorCode *status) |
Get the "skeleton" for an identifier string. More... | |
U_I18N_API icu::UnicodeString & | uspoof_getSkeletonUnicodeString (const USpoofChecker *sc, uint32_t type, const icu::UnicodeString &s, icu::UnicodeString &dest, UErrorCode *status) |
Get the "skeleton" for an identifier string. More... | |
int32_t | uspoof_serialize (USpoofChecker *sc, void *data, int32_t capacity, UErrorCode *status) |
Serialize the data for a spoof detector into a chunk of memory. More... | |
Unicode Security and Spoofing Detection, C API.
These functions are intended to check strings, typically identifiers of some type, such as URLs, for the presence of characters that are likely to be visually confusing - for cases where the displayed form of an identifier may not be what it appears to be.
Unicode Technical Report #36, http://unicode.org/reports/tr36, and Unicode Technical Standard #39, http://unicode.org/reports/tr39 "Unicode security considerations", give more background on security an spoofing issues with Unicode identifiers. The tests and checks provided by this module implement the recommendations from those Unicode documents.
The tests available on identifiers fall into two general categories:
The steps to perform confusability testing are
A USpoofChecker may be used repeatedly to perform checks on any number of identifiers.
Thread Safety: The test functions for checking a single identifier, or for testing whether two identifiers are possible confusable, are thread safe. They may called concurrently, from multiple threads, using the same USpoofChecker instance.
More generally, the standard ICU thread safety rules apply: functions that take a const USpoofChecker parameter are thread safe. Those that take a non-const USpoofChecier are not thread safe.
Descriptions of the available checks.
When testing whether pairs of identifiers are confusable, with the uspoof_areConfusable() family of functions, the relevant tests are
The safest approach is to enable all three of these checks as a group.
USPOOF_ANY_CASE is a modifier for the above tests. If the identifiers being checked can be of mixed case and are used in a case-sensitive manner, this option should be specified.
If the identifiers being checked are used in a case-insensitive manner, and if they are displayed to users in lower-case form only, the USPOOF_ANY_CASE option should not be specified. Confusabality issues involving upper case letters will not be reported.
When performing tests on a single identifier, with the uspoof_check() family of functions, the relevant tests are:
Note on Scripts: Characters from the Unicode Scripts "Common" and "Inherited" are ignored when considering the script of an identifier. Common characters include digits and symbols that are normally used with text from more than one script.
Identifier Skeletons: A skeleton is a transformation of an identifier, such that all identifiers that are confusable with each other have the same skeleton. Using skeletons, it is possible to build a dictionary data structure for a set of identifiers, and then quickly test whether a new identifier is confusable with an identifier already in the set. The uspoof_getSkeleton() family of functions will produce the skeleton from an identifier.
Note that skeletons are not guaranteed to be stable between versions of Unicode or ICU, so an applications should not rely on creating a permanent, or difficult to update, database of skeletons. Instabilities result from identifying new pairs or sequences of characters that are visually confusable, and thus must be mapped to the same skeleton character(s).
Definition in file uspoof.h.
typedef enum USpoofChecks USpoofChecks |
Enum for the kinds of checks that USpoofChecker can perform.
These enum values are used both to select the set of checks that will be performed, and to report results from the check function.
enum USpoofChecks |
Enum for the kinds of checks that USpoofChecker can perform.
These enum values are used both to select the set of checks that will be performed, and to report results from the check function.
Enumerator | |
---|---|
USPOOF_SINGLE_SCRIPT_CONFUSABLE |
Single script confusable test. When testing whether two identifiers are confusable, report that they are if both are from the same script and they are visually confusable. Note: this test is not applicable to a check of a single identifier. |
USPOOF_MIXED_SCRIPT_CONFUSABLE |
Mixed script confusable test. When checking a single identifier, report a problem if the identifier contains multiple scripts, and is confusable with some other identifier in a single script When testing whether two identifiers are confusable, report that they are if the two IDs are visually confusable, and at least one contains characters from more than one script. |
USPOOF_WHOLE_SCRIPT_CONFUSABLE |
Whole script confusable test. When checking a single identifier, report a problem if The identifier is of a single script, and there exists a confusable identifier in another script. When testing whether two identifiers are confusable, report that they are if each is of a single script, the scripts of the two identifiers are different, and the identifiers are visually confusable. |
USPOOF_ANY_CASE |
Any Case Modifier for confusable identifier tests. If specified, consider all characters, of any case, when looking for confusables. If USPOOF_ANY_CASE is not specified, identifiers being checked are assumed to have been case folded. Upper case confusable characters will not be checked. Selects between Lower Case Confusable and Any Case Confusable. |
USPOOF_SINGLE_SCRIPT |
Check that an identifier contains only characters from a single script (plus chars from the common and inherited scripts.) Applies to checks of a single identifier check only. |
USPOOF_INVISIBLE |
Check an identifier for the presence of invisible characters, such as zero-width spaces, or character sequences that are likely not to display, such as multiple occurrences of the same non-spacing mark. This check does not test the input string as a whole for conformance to any particular syntax for identifiers. |
USPOOF_CHAR_LIMIT |
Check that an identifier contains only characters from a specified set of acceptable characters. See uspoof_setAllowedChars() and uspoof_setAllowedLocales(). |
int32_t uspoof_areConfusable | ( | const USpoofChecker * | sc, |
const UChar * | s1, | ||
int32_t | length1, | ||
const UChar * | s2, | ||
int32_t | length2, | ||
UErrorCode * | status | ||
) |
Check the whether two specified strings are visually confusable.
The types of confusability to be tested - single script, mixed script, or whole script - are determined by the check options set for the USpoofChecker.
The tests to be performed are controlled by the flags USPOOF_SINGLE_SCRIPT_CONFUSABLE USPOOF_MIXED_SCRIPT_CONFUSABLE USPOOF_WHOLE_SCRIPT_CONFUSABLE At least one of these tests must be selected.
USPOOF_ANY_CASE is a modifier for the tests. Select it if the identifiers may be of mixed case. If identifiers are case folded for comparison and display to the user, do not select the USPOOF_ANY_CASE option.
sc | The USpoofChecker |
s1 | The first of the two strings to be compared for confusability. The strings are in UTF-16 format. |
length1 | the length of the first string, expressed in 16 bit UTF-16 code units, or -1 if the string is zero terminated. |
s2 | The second of the two strings to be compared for confusability. The strings are in UTF-16 format. |
length2 | The length of the second string, expressed in 16 bit UTF-16 code units, or -1 if the string is zero terminated. |
status | The error code, set if an error occurred while attempting to perform the check. Confusability of the strings is not reported here, but through this function's return value. |
int32_t uspoof_areConfusableUnicodeString | ( | const USpoofChecker * | sc, |
const icu::UnicodeString & | s1, | ||
const icu::UnicodeString & | s2, | ||
UErrorCode * | status | ||
) |
Check the whether two specified strings are visually confusable.
The types of confusability to be tested - single script, mixed script, or whole script - are determined by the check options set for the USpoofChecker.
sc | The USpoofChecker |
s1 | The first of the two strings to be compared for confusability. The strings are in UTF-8 format. |
s2 | The second of the two strings to be compared for confusability. The strings are in UTF-18 format. |
status | The error code, set if an error occurred while attempting to perform the check. Confusability of the strings is not reported here, but through this function's return value. |
int32_t uspoof_areConfusableUTF8 | ( | const USpoofChecker * | sc, |
const char * | s1, | ||
int32_t | length1, | ||
const char * | s2, | ||
int32_t | length2, | ||
UErrorCode * | status | ||
) |
Check the whether two specified strings are visually confusable.
The types of confusability to be tested - single script, mixed script, or whole script - are determined by the check options set for the USpoofChecker.
sc | The USpoofChecker |
s1 | The first of the two strings to be compared for confusability. The strings are in UTF-8 format. |
length1 | the length of the first string, in bytes, or -1 if the string is zero terminated. |
s2 | The second of the two strings to be compared for confusability. The strings are in UTF-18 format. |
length2 | The length of the second string in bytes, or -1 if the string is zero terminated. |
status | The error code, set if an error occurred while attempting to perform the check. Confusability of the strings is not reported here, but through this function's return value. |
int32_t uspoof_check | ( | const USpoofChecker * | sc, |
const UChar * | text, | ||
int32_t | length, | ||
int32_t * | position, | ||
UErrorCode * | status | ||
) |
Check the specified string for possible security issues.
The text to be checked will typically be an identifier of some sort. The set of checks to be performed is specified with uspoof_setChecks().
sc | The USpoofChecker |
text | The string to be checked for possible security issues, in UTF-16 format. |
length | the length of the string to be checked, expressed in 16 bit UTF-16 code units, or -1 if the string is zero terminated. |
position | An out parameter that receives the index of the first string position that fails the allowed character limitation checks. This parameter may be null if the position information is not needed. If the string passes the requested checks the parameter value will not be set. |
status | The error code, set if an error occurred while attempting to perform the check. Spoofing or security issues detected with the input string are not reported here, but through the function's return value. |
int32_t uspoof_checkUnicodeString | ( | const USpoofChecker * | sc, |
const icu::UnicodeString & | text, | ||
int32_t * | position, | ||
UErrorCode * | status | ||
) |
Check the specified string for possible security issues.
The text to be checked will typically be an identifier of some sort. The set of checks to be performed is specified with uspoof_setChecks().
sc | The USpoofChecker |
text | A UnicodeString to be checked for possible security issues. |
position | An out parameter that receives the index of the first string position that fails the allowed character limitation checks. This parameter may be null if the position information is not needed. If the string passes the requested checks the parameter value will not be set. |
status | The error code, set if an error occurred while attempting to perform the check. Spoofing or security issues detected with the input string are not reported here, but through the function's return value. |
int32_t uspoof_checkUTF8 | ( | const USpoofChecker * | sc, |
const char * | text, | ||
int32_t | length, | ||
int32_t * | position, | ||
UErrorCode * | status | ||
) |
Check the specified string for possible security issues.
The text to be checked will typically be an identifier of some sort. The set of checks to be performed is specified with uspoof_setChecks().
sc | The USpoofChecker |
text | A UTF-8 string to be checked for possible security issues. |
length | the length of the string to be checked, or -1 if the string is zero terminated. |
position | An out parameter that receives the index of the first string position that fails the allowed character limitation checks. This parameter may be null if the position information is not needed. If the string passes the requested checks the parameter value will not be set. |
status | The error code, set if an error occurred while attempting to perform the check. Spoofing or security issues detected with the input string are not reported here, but through the function's return value. If the input contains invalid UTF-8 sequences, a status of U_INVALID_CHAR_FOUND will be returned. |
USpoofChecker* uspoof_clone | ( | const USpoofChecker * | sc, |
UErrorCode * | status | ||
) |
Clone a Spoof Checker.
The clone will be set to perform the same checks as the original source.
sc | The source USpoofChecker |
status | The error code, set if this function encounters a problem. |
void uspoof_close | ( | USpoofChecker * | sc | ) |
Close a Spoof Checker, freeing any memory that was being held by its implementation.
const USet* uspoof_getAllowedChars | ( | const USpoofChecker * | sc, |
UErrorCode * | status | ||
) |
Get a USet for the characters permitted in an identifier.
This corresponds to the limits imposed by the Set Allowed Characters functions. Limitations imposed by other checks will not be reflected in the set returned by this function.
The returned set will be frozen, meaning that it cannot be modified by the caller.
Ownership of the returned set remains with the Spoof Detector. The returned set will become invalid if the spoof detector is closed, or if a new set of allowed characters is specified.
sc | The USpoofChecker |
status | The error code, set if this function encounters a problem. |
const char* uspoof_getAllowedLocales | ( | USpoofChecker * | sc, |
UErrorCode * | status | ||
) |
Get a list of locales for the scripts that are acceptable in strings to be checked.
If no limitations on scripts have been specified, an empty string will be returned.
uspoof_setAllowedChars() will reset the list of allowed to be empty.
The format of the returned list is the same as that supplied to uspoof_setAllowedLocales(), but returned list may not be identical to the originally specified string; the string may be reformatted, and information other than languages from the originally specified locales may be omitted.
sc | The USpoofChecker |
status | The error code, set if this function encounters a problem. |
const icu::UnicodeSet* uspoof_getAllowedUnicodeSet | ( | const USpoofChecker * | sc, |
UErrorCode * | status | ||
) |
Get a UnicodeSet for the characters permitted in an identifier.
This corresponds to the limits imposed by the Set Allowed Characters / UnicodeSet functions. Limitations imposed by other checks will not be reflected in the set returned by this function.
The returned set will be frozen, meaning that it cannot be modified by the caller.
Ownership of the returned set remains with the Spoof Detector. The returned set will become invalid if the spoof detector is closed, or if a new set of allowed characters is specified.
sc | The USpoofChecker |
status | The error code, set if this function encounters a problem. |
int32_t uspoof_getChecks | ( | const USpoofChecker * | sc, |
UErrorCode * | status | ||
) |
Get the set of checks that this Spoof Checker has been configured to perform.
sc | The USpoofChecker |
status | The error code, set if this function encounters a problem. |
int32_t uspoof_getSkeleton | ( | const USpoofChecker * | sc, |
uint32_t | type, | ||
const UChar * | s, | ||
int32_t | length, | ||
UChar * | dest, | ||
int32_t | destCapacity, | ||
UErrorCode * | status | ||
) |
Get the "skeleton" for an identifier string.
Skeletons are a transformation of the input string; Two strings are confusable if their skeletons are identical. See Unicode UAX 39 for additional information.
Using skeletons directly makes it possible to quickly check whether an identifier is confusable with any of some large set of existing identifiers, by creating an efficiently searchable collection of the skeletons.
sc | The USpoofChecker |
type | The type of skeleton, corresponding to which of the Unicode confusable data tables to use. The default is Mixed-Script, Lowercase. Allowed options are USPOOF_SINGLE_SCRIPT_CONFUSABLE and USPOOF_ANY_CASE_CONFUSABLE. The two flags may be ORed. |
s | The input string whose skeleton will be computed. |
length | The length of the input string, expressed in 16 bit UTF-16 code units, or -1 if the string is zero terminated. |
dest | The output buffer, to receive the skeleton string. |
destCapacity | The length of the output buffer, in 16 bit units. The destCapacity may be zero, in which case the function will return the actual length of the skeleton. |
status | The error code, set if an error occurred while attempting to perform the check. |
U_I18N_API icu::UnicodeString& uspoof_getSkeletonUnicodeString | ( | const USpoofChecker * | sc, |
uint32_t | type, | ||
const icu::UnicodeString & | s, | ||
icu::UnicodeString & | dest, | ||
UErrorCode * | status | ||
) |
Get the "skeleton" for an identifier string.
Skeletons are a transformation of the input string; Two strings are confusable if their skeletons are identical. See Unicode UAX 39 for additional information.
Using skeletons directly makes it possible to quickly check whether an identifier is confusable with any of some large set of existing identifiers, by creating an efficiently searchable collection of the skeletons.
sc | The USpoofChecker. |
type | The type of skeleton, corresponding to which of the Unicode confusable data tables to use. The default is Mixed-Script, Lowercase. Allowed options are USPOOF_SINGLE_SCRIPT_CONFUSABLE and USPOOF_ANY_CASE_CONFUSABLE. The two flags may be ORed. |
s | The input string whose skeleton will be computed. |
dest | The output string, to receive the skeleton string. |
status | The error code, set if an error occurred while attempting to perform the check. |
int32_t uspoof_getSkeletonUTF8 | ( | const USpoofChecker * | sc, |
uint32_t | type, | ||
const char * | s, | ||
int32_t | length, | ||
char * | dest, | ||
int32_t | destCapacity, | ||
UErrorCode * | status | ||
) |
Get the "skeleton" for an identifier string.
Skeletons are a transformation of the input string; Two strings are confusable if their skeletons are identical. See Unicode UAX 39 for additional information.
Using skeletons directly makes it possible to quickly check whether an identifier is confusable with any of some large set of existing identifiers, by creating an efficiently searchable collection of the skeletons.
sc | The USpoofChecker |
type | The type of skeleton, corresponding to which of the Unicode confusable data tables to use. The default is Mixed-Script, Lowercase. Allowed options are USPOOF_SINGLE_SCRIPT_CONFUSABLE and USPOOF_ANY_CASE. The two flags may be ORed. |
s | The UTF-8 format input string whose skeleton will be computed. |
length | The length of the input string, in bytes, or -1 if the string is zero terminated. |
dest | The output buffer, to receive the skeleton string. |
destCapacity | The length of the output buffer, in bytes. The destCapacity may be zero, in which case the function will return the actual length of the skeleton. |
status | The error code, set if an error occurred while attempting to perform the check. Possible Errors include U_INVALID_CHAR_FOUND for invalid UTF-8 sequences, and U_BUFFER_OVERFLOW_ERROR if the destination buffer is too small to hold the complete skeleton. |
USpoofChecker* uspoof_open | ( | UErrorCode * | status | ) |
Create a Unicode Spoof Checker, configured to perform all checks except for USPOOF_LOCALE_LIMIT and USPOOF_CHAR_LIMIT.
Note that additional checks may be added in the future, resulting in the changes to the default checking behavior.
status | The error code, set if this function encounters a problem. |
USpoofChecker* uspoof_openFromSerialized | ( | const void * | data, |
int32_t | length, | ||
int32_t * | pActualLength, | ||
UErrorCode * | pErrorCode | ||
) |
Open a Spoof checker from its serialized from, stored in 32-bit-aligned memory.
Inverse of uspoof_serialize(). The memory containing the serialized data must remain valid and unchanged as long as the spoof checker, or any cloned copies of the spoof checker, are in use. Ownership of the memory remains with the caller. The spoof checker (and any clones) must be closed prior to deleting the serialized data.
data | a pointer to 32-bit-aligned memory containing the serialized form of spoof data |
length | the number of bytes available at data; can be more than necessary |
pActualLength | receives the actual number of bytes at data taken up by the data; can be NULL |
pErrorCode | ICU error code |
USpoofChecker* uspoof_openFromSource | ( | const char * | confusables, |
int32_t | confusablesLen, | ||
const char * | confusablesWholeScript, | ||
int32_t | confusablesWholeScriptLen, | ||
int32_t * | errType, | ||
UParseError * | pe, | ||
UErrorCode * | status | ||
) |
Open a Spoof Checker from the source form of the spoof data.
The Three inputs correspond to the Unicode data files confusables.txt confusablesWholeScript.txt and xidmdifications.txt as described in Unicode UAX 39. The syntax of the source data is as described in UAX 39 for these files, and the content of these files is acceptable input.
The character encoding of the (char *) input text is UTF-8.
confusables | a pointer to the confusable characters definitions, as found in file confusables.txt from unicode.org. |
confusablesLen | The length of the confusables text, or -1 if the input string is zero terminated. |
confusablesWholeScript | a pointer to the whole script confusables definitions, as found in the file confusablesWholeScript.txt from unicode.org. |
confusablesWholeScriptLen | The length of the whole script confusables text, or -1 if the input string is zero terminated. |
errType | In the event of an error in the input, indicates which of the input files contains the error. The value is one of USPOOF_SINGLE_SCRIPT_CONFUSABLE or USPOOF_WHOLE_SCRIPT_CONFUSABLE, or zero if no errors are found. |
pe | In the event of an error in the input, receives the position in the input text (line, offset) of the error. |
status | an in/out ICU UErrorCode. Among the possible errors is U_PARSE_ERROR, which is used to report syntax errors in the input. |
int32_t uspoof_serialize | ( | USpoofChecker * | sc, |
void * | data, | ||
int32_t | capacity, | ||
UErrorCode * | status | ||
) |
Serialize the data for a spoof detector into a chunk of memory.
The flattened spoof detection tables can later be used to efficiently instantiate a new Spoof Detector.
sc | the Spoof Detector whose data is to be serialized. |
data | a pointer to 32-bit-aligned memory to be filled with the data, can be NULL if capacity==0 |
capacity | the number of bytes available at data, or 0 for preflighting |
status | an in/out ICU UErrorCode; possible errors include:
|
void uspoof_setAllowedChars | ( | USpoofChecker * | sc, |
const USet * | chars, | ||
UErrorCode * | status | ||
) |
Limit the acceptable characters to those specified by a Unicode Set.
Any previously specified character limit is is replaced by the new settings. This includes limits on characters that were set with the uspoof_setAllowedLocales() function.
The USPOOF_CHAR_LIMIT test is automatically enabled for this USpoofChecker by this function.
sc | The USpoofChecker |
chars | A Unicode Set containing the list of characters that are permitted. Ownership of the set remains with the caller. The incoming set is cloned by this function, so there are no restrictions on modifying or deleting the USet after calling this function. |
status | The error code, set if this function encounters a problem. |
void uspoof_setAllowedLocales | ( | USpoofChecker * | sc, |
const char * | localesList, | ||
UErrorCode * | status | ||
) |
Limit characters that are acceptable in identifiers being checked to those normally used with the languages associated with the specified locales.
Any previously specified list of locales is replaced by the new settings.
A set of languages is determined from the locale(s), and from those a set of acceptable Unicode scripts is determined. Characters from this set of scripts, along with characters from the "common" and "inherited" Unicode Script categories will be permitted.
Supplying an empty string removes all restrictions; characters from any script will be allowed.
The USPOOF_CHAR_LIMIT test is automatically enabled for this USpoofChecker when calling this function with a non-empty list of locales.
The Unicode Set of characters that will be allowed is accessible via the uspoof_getAllowedChars() function. uspoof_setAllowedLocales() will replace any previously applied set of allowed characters.
Adjustments, such as additions or deletions of certain classes of characters, can be made to the result of uspoof_setAllowedLocales() by fetching the resulting set with uspoof_getAllowedChars(), manipulating it with the Unicode Set API, then resetting the spoof detectors limits with uspoof_setAllowedChars()
sc | The USpoofChecker |
localesList | A list list of locales, from which the language and associated script are extracted. The locales are comma-separated if there is more than one. White space may not appear within an individual locale, but is ignored otherwise. The locales are syntactically like those from the HTTP Accept-Language header. If the localesList is empty, no restrictions will be placed on the allowed characters. |
status | The error code, set if this function encounters a problem. |
void uspoof_setAllowedUnicodeSet | ( | USpoofChecker * | sc, |
const icu::UnicodeSet * | chars, | ||
UErrorCode * | status | ||
) |
Limit the acceptable characters to those specified by a Unicode Set.
Any previously specified character limit is is replaced by the new settings. This includes limits on characters that were set with the uspoof_setAllowedLocales() function.
The USPOOF_CHAR_LIMIT test is automatically enabled for this USoofChecker by this function.
sc | The USpoofChecker |
chars | A Unicode Set containing the list of characters that are permitted. Ownership of the set remains with the caller. The incoming set is cloned by this function, so there are no restrictions on modifying or deleting the USet after calling this function. |
status | The error code, set if this function encounters a problem. |
void uspoof_setChecks | ( | USpoofChecker * | sc, |
int32_t | checks, | ||
UErrorCode * | status | ||
) |
Specify the set of checks that will be performed by the check functions of this Spoof Checker.
sc | The USpoofChecker |
checks | The set of checks that this spoof checker will perform. The value is a bit set, obtained by OR-ing together values from enum USpoofChecks. |
status | The error code, set if this function encounters a problem. |