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===============================================================================
assorted - Assorted functions 2006-02-25
DESCRIPTION
Some functions have been taken out of libHX because they are largely unused
in code I write. Since there are currently not too many users of libHX that
seem to need these functions, they currently remain out.
SYNOPSIS
size_t HX_pack(char *fmt, size_t len, ...);
int HX_tofrac(size_t *num, size_t *denom, double arg);
HX_pack()
Mimics perl's pack function. FMT can contain:
A Pascal-style string: a uint8_t length specifier and a string
with up to 255 chars
a (same)
C encode as uint8_t
c encode as int8_t
H encode as uint16_t
h encode as int16_t
L encode as uint32_t
l encode as int32_t
S Like A, but with a uint16_t length specifier and a string
with up to 64K chars
s (same)
V fixed-size string; first argument is string, second is length
Example:
HX_pack(dest, sizeof(dest), "LLSV", 1337, 2006, "64k test string",
"fixed test", 5);
will produce this byte sequence on x86:
39 05 00 00 1337
D6 07 00 00 2006
0E 00 15
36 34 6B 20 74 65 "64k test string" (length=15)
73 74 20 73 74 72
69 6E 67
66 69 78 65 64 "fixed"
HX_tofrac()
Calculates a readable fraction (i.e. 1/3) from arg and puts the
*numerator into num, the denominator into *denom. Since the fraction
is found out by an iterative loop, you can specify the minimum value
of the denominator in *num and the maximum value of the denominator
into *denom before calling the function.
If a suitable fraction has been found (within the range of the
minimum / maximum denominator, *num and *denom will be overwritten
with the results and 1 is returned; 0 for no success.
You need to re-put your min/max denom values into *num and *denom
then.
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