FreeCalypso > hg > freecalypso-tools
changeset 330:d29b45c4c8db
uptools/libcoding: 7-bit decoding implemented
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Sat, 03 Feb 2018 22:21:15 +0000 |
| parents | 18c692984549 |
| children | 110fffa1f001 |
| files | uptools/libcoding/Makefile uptools/libcoding/gsm7_unpack.c |
| diffstat | 2 files changed, 24 insertions(+), 2 deletions(-) [+] |
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--- a/uptools/libcoding/Makefile Sat Feb 03 20:37:14 2018 +0000 +++ b/uptools/libcoding/Makefile Sat Feb 03 22:21:15 2018 +0000 @@ -1,7 +1,7 @@ CC= gcc CFLAGS= -O2 -OBJS= decode_helpers.o gsm7_decode.o gsm7_decode_tables.o hexdecode.o \ - ucs2_decode.o +OBJS= decode_helpers.o gsm7_decode.o gsm7_decode_tables.o gsm7_unpack.o \ + hexdecode.o ucs2_decode.o LIB= libcoding.a all: ${LIB}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/uptools/libcoding/gsm7_unpack.c Sat Feb 03 22:21:15 2018 +0000 @@ -0,0 +1,22 @@ +/* + * This library module implements unpacking of GSM 7-bit data + * from packed octets. + */ + +#include <sys/types.h> + +static u_char shift[8] = {0, 7, 6, 5, 4, 3, 2, 1}; + +gsm7_unpack(inbuf, outbuf, nseptets) + u_char *inbuf, *outbuf; + unsigned nseptets; +{ + u_char *inp = inbuf, *outp = outbuf; + unsigned n; + + for (n = 0; n < nseptets; n++) { + *outp++ = (((inp[1] << 8) | inp[0]) >> shift[n&7]) & 0x7F; + if (n & 7) + inp++; + } +}