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extern "C" { fn udata_setCommonData_68(this: *const u8, error_code: *mut i32); } /// This function bypasses the normal ICU data loading process and allows you to force ICU's system /// data to come out of a user-specified area in memory. /// /// ICU data must be at least 8-aligned, and should be 16-aligned. See /// https://unicode-org.github.io/icu/userguide/icudata /// /// The format of this data is that of the icu common data file, as is generated by the pkgdata /// tool with mode=common or mode=dll. You can read in a whole common mode file and pass the /// address to the start of the data, or (with the appropriate link options) pass in the pointer to /// the data that has been loaded from a dll by the operating system, as shown in this code: /// /// ```c++ /// extern const char U_IMPORT U_ICUDATA_ENTRY_POINT []; /// // U_ICUDATA_ENTRY_POINT is same as entry point specified to pkgdata tool /// UErrorCode status = U_ZERO_ERROR; /// /// udata_setCommonData(&U_ICUDATA_ENTRY_POINT, &status); /// ``` /// /// It is important that the declaration be as above. The entry point must not be declared as an /// extern void*. /// /// Starting with ICU 4.4, it is possible to set several data packages, one per call to this /// function. udata_open() will look for data in the multiple data packages in the order in which /// they were set. The position of the linked-in or default-name ICU .data package in the search /// list depends on when the first data item is loaded that is not contained in the already /// explicitly set packages. If data was loaded implicitly before the first call to this function /// (for example, via opening a converter, constructing a UnicodeString from default-codepage data, /// using formatting or collation APIs, etc.), then the default data will be first in the list. /// /// This function has no effect on application (non ICU) data. See udata_setAppData() for similar /// functionality for application data. // TODO(ry) Map error code to something useful. pub fn set_common_data(data: &'static [u8]) -> Result<(), i32> { let mut error_code = 0i32; unsafe { udata_setCommonData_68(data.as_ptr(), &mut error_code); } if error_code == 0 { Ok(()) } else { Err(error_code) } }