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71 lines
2.8 KiB
Rust
71 lines
2.8 KiB
Rust
use crate::support::char;
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use std::ffi::CString;
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extern "C" {
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fn icu_get_default_locale(output: *mut char, output_len: usize) -> usize;
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fn icu_set_default_locale(locale: *const char);
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fn udata_setCommonData_73(this: *const u8, error_code: *mut i32);
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}
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/// This function bypasses the normal ICU data loading process and allows you to force ICU's system
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/// data to come out of a user-specified area in memory.
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///
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/// ICU data must be at least 8-aligned, and should be 16-aligned. See
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/// https://unicode-org.github.io/icu/userguide/icudata
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///
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/// The format of this data is that of the icu common data file, as is generated by the pkgdata
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/// tool with mode=common or mode=dll. You can read in a whole common mode file and pass the
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/// address to the start of the data, or (with the appropriate link options) pass in the pointer to
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/// the data that has been loaded from a dll by the operating system, as shown in this code:
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///
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/// ```c++
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/// extern const char U_IMPORT U_ICUDATA_ENTRY_POINT [];
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/// // U_ICUDATA_ENTRY_POINT is same as entry point specified to pkgdata tool
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/// UErrorCode status = U_ZERO_ERROR;
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///
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/// udata_setCommonData(&U_ICUDATA_ENTRY_POINT, &status);
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/// ```
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///
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/// It is important that the declaration be as above. The entry point must not be declared as an
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/// extern void*.
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///
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/// Starting with ICU 4.4, it is possible to set several data packages, one per call to this
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/// function. udata_open() will look for data in the multiple data packages in the order in which
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/// they were set. The position of the linked-in or default-name ICU .data package in the search
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/// list depends on when the first data item is loaded that is not contained in the already
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/// explicitly set packages. If data was loaded implicitly before the first call to this function
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/// (for example, via opening a converter, constructing a UnicodeString from default-codepage data,
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/// using formatting or collation APIs, etc.), then the default data will be first in the list.
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///
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/// This function has no effect on application (non ICU) data. See udata_setAppData() for similar
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/// functionality for application data.
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// TODO(ry) Map error code to something useful.
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#[inline(always)]
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pub fn set_common_data_73(data: &'static [u8]) -> Result<(), i32> {
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let mut error_code = 0i32;
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unsafe {
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udata_setCommonData_73(data.as_ptr(), &mut error_code);
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}
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if error_code == 0 {
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Ok(())
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} else {
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Err(error_code)
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}
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}
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/// Returns BCP47 language tag.
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pub fn get_language_tag() -> String {
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let mut output = [0u8; 1024];
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let len = unsafe {
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icu_get_default_locale(output.as_mut_ptr() as *mut char, output.len())
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};
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std::str::from_utf8(&output[..len]).unwrap().to_owned()
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}
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pub fn set_default_locale(locale: &str) {
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unsafe {
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let c_str = CString::new(locale).expect("Invalid locale");
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icu_set_default_locale(c_str.as_ptr());
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}
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}
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