From 5c18e26bc291766b0de22223abcf340bc48e3157 Mon Sep 17 00:00:00 2001 From: Max Date: Fri, 5 Feb 2016 13:55:38 +0100 Subject: Add T4 bit map compression routines Add bit map encoder and decoder functions: decoder is fully functional while encoder is good enough for testing - no backtracking to find the best possible compression is implemented. If somebody is willing to implement MS side of EDGE than this has to be expanded. Add corresponding tests. N. B: the encoding is implemented according to ETSI TS 44.060 which is slightly different from T4 used for fax according to CCITT G31D (RFC 804). Ticket: OW#2407 Sponsored-by: On-Waves ehf Signed-off-by: Max --- tests/bits/bitcomp_test.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++ tests/bits/bitcomp_test.ok | 29 ++++++++++++++++++++ 2 files changed, 95 insertions(+) create mode 100644 tests/bits/bitcomp_test.c create mode 100644 tests/bits/bitcomp_test.ok (limited to 'tests/bits') diff --git a/tests/bits/bitcomp_test.c b/tests/bits/bitcomp_test.c new file mode 100644 index 00000000..f6895cf9 --- /dev/null +++ b/tests/bits/bitcomp_test.c @@ -0,0 +1,66 @@ +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +static char lol[1024]; // for pretty-printing + +int main(int argc, char **argv) +{ + srand(time(NULL)); + + struct bitvec bv, out; + uint8_t i = 20, test[i], data[i]; + + bv.data_len = i; + bv.data = test; + out.data_len = i; + out.data = data; + bitvec_zero(&bv); + bitvec_zero(&out); + + printf("\nrunning static tests...\n"); + + printf("\nTEST1:\n 00110111 01000111 10000001 1111\n"); + bitvec_zero(&bv); + bitvec_set_uint(&bv, 0x374781F, 28); bitvec_to_string_r(&bv, lol); printf("%s", lol); + + printf("\nEncoded:\n%d", osmo_t4_encode(&bv)); bitvec_to_string_r(&bv, lol); printf("%s", lol); + printf(" [%d]\nExpected:\n0 11011110 10001000 01110101 01100101 100 [35]\n", bv.cur_bit); + + bitvec_zero(&bv); + bitvec_set_uint(&bv, 0xDE887565, 32); + bitvec_set_uint(&bv, 4, 3); + bitvec_to_string_r(&bv, lol); + printf(" %s [%d]\n", lol, bv.cur_bit); + int d = osmo_t4_decode(&bv, 0, &out); + printf("\nDecoded:\n%d", d); + bitvec_to_string_r(&out, lol); + printf("%s [%d]\n", lol, out.cur_bit); + printf("Expected:\n 00110111 01000111 10000001 1111 \n"); + + printf("\nTEST2:\n 11111111 11111111 11111111 11111111 11111111 11111111 11111111 11111111 11111111 11111111 00000000 00\n"); + bitvec_zero(&bv); + bitvec_set_uint(&bv, 0xFFFFFFFF, 32); + bitvec_set_uint(&bv, 0xFFFFFFFF, 32); + bitvec_set_uint(&bv, 0xFFFFFC00, 26); bitvec_to_string_r(&bv, lol); printf("%s", lol); + printf("\nEncoded:\n%d", osmo_t4_encode(&bv)); bitvec_to_string_r(&bv, lol); printf("%s", lol); + printf(" [%d]\nExpected:\n1 11011101 01000001 00 [18]\n", bv.cur_bit); + + bitvec_zero(&out); + d = osmo_t4_decode(&bv, 1, &out); + printf("\nDecoded:\n%d", d); + bitvec_to_string_r(&out, lol); + printf("%s [%d]\n", lol, out.cur_bit); + printf("Expected:\n 11111111 11111111 11111111 11111111 11111111 11111111 11111111 11111111 11111111 11111111 00000000 00\n"); + + return 0; +} diff --git a/tests/bits/bitcomp_test.ok b/tests/bits/bitcomp_test.ok new file mode 100644 index 00000000..238f3c47 --- /dev/null +++ b/tests/bits/bitcomp_test.ok @@ -0,0 +1,29 @@ + +running static tests... + +TEST1: + 00110111 01000111 10000001 1111 + 00110111 01000111 10000001 1111 +Encoded: +-1 00110111 01000111 10000001 1111 [28] +Expected: +0 11011110 10001000 01110101 01100101 100 [35] + 11011110 10001000 01110101 01100101 100 [35] + +Decoded: +0 00110111 01000111 10000001 1111 [28] +Expected: + 00110111 01000111 10000001 1111 + +TEST2: + 11111111 11111111 11111111 11111111 11111111 11111111 11111111 11111111 11111111 11111111 00000000 00 + 11111111 11111111 11111111 11111111 11111111 11111111 11111111 11111111 11111111 11111111 00000000 00 +Encoded: +1 11011101 01000001 00 [18] +Expected: +1 11011101 01000001 00 [18] + +Decoded: +0 11111111 11111111 11111111 11111111 11111111 11111111 11111111 11111111 11111111 11111111 00000000 00 [90] +Expected: + 11111111 11111111 11111111 11111111 11111111 11111111 11111111 11111111 11111111 11111111 00000000 00 -- cgit v1.2.3