Function v8::icu::set_common_data_71

pub fn set_common_data_71(data: &'static [u8]) -> Result<(), 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:

      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.