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unicode: Unify check for UTF-16 BOM

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Adds utf16_has_bom function

Change-Id: I67ea474c9cf6ca6e6684351c2f54131164b7903c
This commit is contained in:
Roman Artiukhin 2024-12-11 16:00:55 +02:00
parent 11fbbc7826
commit a23002cd5e
4 changed files with 43 additions and 33 deletions
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22
firmware/common/unicode.c
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@ -437,6 +437,28 @@ unsigned char* utf16BEdecode(const unsigned char *utf16, unsigned char *utf8,
return utf8;
}
bool utf16_has_bom(const unsigned char *utf16, bool *le)
{
unsigned long ucs = utf16[0] << 8 | utf16[1];
if (ucs == 0xFEFF) /* Check for BOM */
{
*le = false;
return true;
}
if (ucs == 0xFFFE)
{
*le = true;
return true;
}
/* If there is no BOM let's try to guess it. If one of the bytes is 0x00, it is
probably the most significant one. */
*le = utf16[1] == 0;
return false;
}
#if 0 /* currently unused */
/* Recode any UTF-16 string to UTF-8 */
unsigned char* utf16decode(const unsigned char *utf16, unsigned char *utf8,