diff options
Diffstat (limited to 'libavutil/common.h')
| -rw-r--r-- | libavutil/common.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/libavutil/common.h b/libavutil/common.h index 0797a79ac0..a6303d9872 100644 --- a/libavutil/common.h +++ b/libavutil/common.h @@ -266,6 +266,30 @@ static inline av_const int av_ceil_log2(int x) } /*! + * \def GET_UTF16(val, GET_16BIT, ERROR) + * Converts a UTF-16 character (2 or 4 bytes) to its 32-bit UCS-4 encoded form + * \param val is the output and should be of type uint32_t. It holds the converted + * UCS-4 character and should be a left value. + * \param GET_16BIT gets two bytes of UTF-16 encoded data converted to native endianness. + * It can be a function or a statement whose return value or evaluated value is of type + * uint16_t. It will be executed up to 2 times. + * \param ERROR action that should be taken when an invalid UTF-16 surrogate is + * returned from GET_BYTE. It should be a statement that jumps out of the macro, + * like exit(), goto, return, break, or continue. + */ +#define GET_UTF16(val, GET_16BIT, ERROR)\ + val = GET_16BIT;\ + {\ + unsigned int hi = val - 0xD800;\ + if (hi < 0x800) {\ + val = GET_16BIT - 0xDC00;\ + if (val > 0x3FFU || hi > 0x3FFU)\ + ERROR\ + val += (hi<<10) + 0x10000;\ + }\ + }\ + +/*! * \def PUT_UTF8(val, tmp, PUT_BYTE) * Converts a 32-bit Unicode character to its UTF-8 encoded form (up to 4 bytes long). * \param val is an input-only argument and should be of type uint32_t. It holds |