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Issue #11734: Add support for IEEE 754 half-precision floats to the struct module. Original patch by Eli Stevens.

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This commit is contained in:
Mark Dickinson 2016-09-03 17:21:29 +01:00
parent 2500c98278
commit 7c4e409d07
7 changed files with 393 additions and 11 deletions
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10
Include/floatobject.h
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@ -74,9 +74,9 @@ PyAPI_FUNC(double) PyFloat_AsDouble(PyObject *);
* happens in such cases is partly accidental (alas).
*/
/* The pack routines write 4 or 8 bytes, starting at p. le is a bool
/* The pack routines write 2, 4 or 8 bytes, starting at p. le is a bool
* argument, true if you want the string in little-endian format (exponent
* last, at p+3 or p+7), false if you want big-endian format (exponent
* last, at p+1, p+3 or p+7), false if you want big-endian format (exponent
* first, at p).
* Return value: 0 if all is OK, -1 if error (and an exception is
* set, most likely OverflowError).
@ -84,6 +84,7 @@ PyAPI_FUNC(double) PyFloat_AsDouble(PyObject *);
* 1): What this does is undefined if x is a NaN or infinity.
* 2): -0.0 and +0.0 produce the same string.
*/
PyAPI_FUNC(int) _PyFloat_Pack2(double x, unsigned char *p, int le);
PyAPI_FUNC(int) _PyFloat_Pack4(double x, unsigned char *p, int le);
PyAPI_FUNC(int) _PyFloat_Pack8(double x, unsigned char *p, int le);
@ -96,14 +97,15 @@ PyAPI_FUNC(int) _PyFloat_Repr(double x, char *p, size_t len);
PyAPI_FUNC(int) _PyFloat_Digits(char *buf, double v, int *signum);
PyAPI_FUNC(void) _PyFloat_DigitsInit(void);
/* The unpack routines read 4 or 8 bytes, starting at p. le is a bool
/* The unpack routines read 2, 4 or 8 bytes, starting at p. le is a bool
* argument, true if the string is in little-endian format (exponent
* last, at p+3 or p+7), false if big-endian (exponent first, at p).
* last, at p+1, p+3 or p+7), false if big-endian (exponent first, at p).
* Return value: The unpacked double. On error, this is -1.0 and
* PyErr_Occurred() is true (and an exception is set, most likely
* OverflowError). Note that on a non-IEEE platform this will refuse
* to unpack a string that represents a NaN or infinity.
*/
PyAPI_FUNC(double) _PyFloat_Unpack2(const unsigned char *p, int le);
PyAPI_FUNC(double) _PyFloat_Unpack4(const unsigned char *p, int le);
PyAPI_FUNC(double) _PyFloat_Unpack8(const unsigned char *p, int le);