WIP: a bit working
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bafafe8194
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1272db6744
3 changed files with 167 additions and 44 deletions
142
examples/ex_4.c
142
examples/ex_4.c
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@ -62,6 +62,92 @@ shuffle(rnd_ctx_t *prng, int *array, size_t n)
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}
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}
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int
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compare_ints(const void *a, const void *b)
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{
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return *(const int *)a - *(const int *)b;
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}
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void
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print_array(int *array, size_t l)
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{
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int a[l];
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memcpy(a, array, sizeof(int) * l);
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qsort(a, l, sizeof(int), compare_ints);
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printf("int a[] = {");
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for (int i = 0; i < l; i++) {
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printf("%d", a[i]);
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if (i != l) {
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printf(", ");
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}
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}
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printf("};\n");
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}
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bool
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has_span(int *array, size_t n, int x, int l)
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{
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if (n == 0 || l <= 0) {
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return false;
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}
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int a[n];
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memcpy(a, array, sizeof(int) * n);
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qsort(a, n, sizeof(int), compare_ints);
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// Iterate through the array to find a span starting at x of length l
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for (size_t i = 0; i < n; i++) {
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if (a[i] == x) {
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// Check if the span can fit in the array
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if (i + l - 1 < n && a[i + l - 1] == x + l - 1) {
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return true; // Found the span
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}
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}
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}
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return false; // Span not found
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}
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void
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print_spans(int *array, size_t n)
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{
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int a[n];
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size_t start = 0;
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size_t end = 0;
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if (n == 0) {
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printf("Array is empty\n");
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return;
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}
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memcpy(a, array, sizeof(int) * n);
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qsort(a, n, sizeof(int), compare_ints);
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for (size_t i = 1; i < n; i++) {
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if (a[i] == a[i - 1] + 1) {
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end = i; // Extend the span
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} else {
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// Print the current span
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if (start == end) {
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printf("[%d] ", a[start]);
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} else {
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printf("[%d, %d] ", a[start], a[end]);
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}
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// Move to the next span
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start = i;
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end = i;
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}
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}
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// Print the last span if needed
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if (start == end) {
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printf("[%d]\n", a[start]);
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} else {
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printf("[%d, %d]\n", a[start], a[end]);
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}
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}
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bool
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was_set(size_t bit, const int array[])
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{
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@ -84,13 +170,18 @@ main(void)
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int array[TEST_ARRAY_SIZE];
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// disable buffering
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setbuf(stdout, 0);
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setbuf(stderr, 0);
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// int foo[] = {1, 2, 3, 5, 7, 8 ,9, 10, 21};
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// print_spans(foo, sizeof(foo) / sizeof(foo[0]));
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// exit(0);
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// start with a 1KiB buffer, TEST_ARRAY_SIZE bits
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uint8_t *buf = calloc(TEST_ARRAY_SIZE, sizeof(uint8_t));
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uint8_t *buf = calloc(TEST_ARRAY_SIZE * 1, sizeof(uint8_t));
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// create the sparse bitmap
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sparsemap_t *map = sparsemap(buf, sizeof(uint8_t) * TEST_ARRAY_SIZE, 0);
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sparsemap_t *map = sparsemap(buf, sizeof(uint8_t) * 1024 * 1, 0);
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#if 0
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for (i = 0; i < 8; i++) sparsemap_set(map, i, true);
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@ -117,9 +208,9 @@ main(void)
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__diag("rank was %lu between [0, 10]\n", rank);
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assert(rank == 5);
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sparsemap_clear(map);
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#endif
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for (i = 2049; i < 2057; i++) sparsemap_set(map, i, true);
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for (i = 2049; i < 2057; i++)
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sparsemap_set(map, i, true);
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rank = sparsemap_rank(map, 2049, 2058);
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__diag("rank was %lu at offset 108\n", rank);
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assert(rank == 8);
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@ -134,9 +225,10 @@ main(void)
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__diag("and %d was %s", i, sparsemap_is_set(map, i + 1) ? "set" : "not set");
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rank = sparsemap_rank(map, 2048, 2060);
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__diag("rank was %lu at offset 109\n", rank);
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//rank = sparsemap_span(map, 2048, 8);
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// rank = sparsemap_span(map, 2048, 8);
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//__diag("span was found at %lu\n", rank);
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sparsemap_clear(map);
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#endif
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// seed the PRNG
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#ifdef SEED
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@ -146,13 +238,26 @@ main(void)
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#endif
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for (i = 0; i < TEST_ARRAY_SIZE; i++) {
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array[i] = (int)__random(&prng) % TEST_ARRAY_SIZE + 1;
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uint32_t r = __random(&prng);
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array[i] = (int)r % (4 * TEST_ARRAY_SIZE);
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if (array[i] < 0) {
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i--;
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}
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for (int j = 0; j < i; j++) {
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if (array[j] == array[i]) {
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i--;
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}
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}
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}
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// create a span of at least 8 for testing between 141 and 153
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int j = 143;
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for (i = 0; i < 8; i++) {
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uint32_t r = __random(&prng) % TEST_ARRAY_SIZE;
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array[r] = j++;
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}
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// randomize setting the bits on
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shuffle(&prng, array, TEST_ARRAY_SIZE);
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print_spans(array, TEST_ARRAY_SIZE);
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// set all the bits on in a random order
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for (i = 0; i < TEST_ARRAY_SIZE; i++) {
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@ -161,16 +266,21 @@ main(void)
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assert(sparsemap_is_set(map, array[i]) == true);
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}
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size_t len = 6;
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size_t l = sparsemap_span(map, 0, len);
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__diag("found span of %d at %lu starting from 0\n", len, l);
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for (i = (int)l; i < l + len; i++) {
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bool set = sparsemap_is_set(map, i);
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if (set) {
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__diag("verified %lu was set\n", i);
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} else {
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__diag("darn, %lu was not really set, %s\n", i,
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was_set(i, array) ? "but we thought it was" : "because it wasn't");
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// for (size_t len = 1; len < TEST_ARRAY_SIZE; len++) {
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for (size_t len = 2; len <= 2; len++) {
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__diag("================> %lu\n", len);
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size_t l = sparsemap_span(map, 0, len);
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__diag("found span of %lu at %lu\n", len, l);
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__diag("is_span(%lu, %lu) == %s\n", l, len,
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has_span(array, TEST_ARRAY_SIZE, l, len) ? "yes" : "no");
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for (i = (int)l; i < l + len; i++) {
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bool set = sparsemap_is_set(map, i);
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if (set) {
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__diag("verified %d was set\n", i);
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} else {
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__diag("darn, %d was not really set, %s\n", i,
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was_set(i, array) ? "but we thought it was" : "because it wasn't");
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}
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}
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}
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BIN
main
BIN
main
Binary file not shown.
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@ -384,7 +384,7 @@ __sm_chunk_map_set(__sm_chunk_t *map, size_t idx, bool value, size_t *pos,
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* n'th bit was found in this __sm_chunk_t, or to the new, reduced value of |n|
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*/
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static size_t
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__sm_chunk_map_select(__sm_chunk_t *map, ssize_t n, ssize_t *pnew_n)
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__sm_chunk_map_select(__sm_chunk_t *map, size_t n, ssize_t *pnew_n)
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{
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size_t ret = 0;
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register uint8_t *p;
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@ -432,7 +432,7 @@ __sm_chunk_map_select(__sm_chunk_t *map, ssize_t n, ssize_t *pnew_n)
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}
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}
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*pnew_n = n;
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*pnew_n = (ssize_t)n;
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return (ret);
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}
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@ -440,7 +440,7 @@ __sm_chunk_map_select(__sm_chunk_t *map, ssize_t n, ssize_t *pnew_n)
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* Counts the set bits in the range [start, idx].
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*/
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static size_t
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__sm_chunk_map_rank(__sm_chunk_t *map, size_t start, size_t idx)
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__sm_chunk_map_rank(__sm_chunk_t *map, size_t *loc, size_t idx)
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{
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size_t ret = 0;
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@ -453,46 +453,56 @@ __sm_chunk_map_rank(__sm_chunk_t *map, size_t start, size_t idx)
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}
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if (flags == SM_PAYLOAD_ZEROS) {
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if (idx > SM_BITS_PER_VECTOR) {
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if (start > SM_BITS_PER_VECTOR) {
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start -= SM_BITS_PER_VECTOR;
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if (*loc > SM_BITS_PER_VECTOR) {
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*loc = *loc - SM_BITS_PER_VECTOR;
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} else {
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idx -= SM_BITS_PER_VECTOR - start;
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start = 0;
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idx -= SM_BITS_PER_VECTOR - *loc;
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*loc = 0;
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}
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} else {
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return (ret);
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}
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} else if (flags == SM_PAYLOAD_ONES) {
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if (idx > SM_BITS_PER_VECTOR) {
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if (start > SM_BITS_PER_VECTOR) {
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start -= SM_BITS_PER_VECTOR;
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if (*loc > SM_BITS_PER_VECTOR) {
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*loc = *loc - SM_BITS_PER_VECTOR;
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} else {
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idx -= SM_BITS_PER_VECTOR - start;
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if (start == 0) {
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idx -= SM_BITS_PER_VECTOR - *loc;
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if (*loc == 0) {
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ret += SM_BITS_PER_VECTOR;
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}
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start = 0;
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*loc = 0;
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}
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} else {
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return (ret + idx);
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}
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} else if (flags == SM_PAYLOAD_MIXED) {
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if (idx > SM_BITS_PER_VECTOR) {
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if (start > SM_BITS_PER_VECTOR) {
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start -= SM_BITS_PER_VECTOR;
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if (*loc > SM_BITS_PER_VECTOR) {
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*loc = *loc - SM_BITS_PER_VECTOR;
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} else {
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idx -= SM_BITS_PER_VECTOR - start;
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if (start == 0) {
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idx -= SM_BITS_PER_VECTOR - *loc;
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if (*loc == 0) {
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ret += popcountll((uint64_t)map->m_data[1 +
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__sm_chunk_map_get_position(map,
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i * SM_FLAGS_PER_INDEX_BYTE + j)]);
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}
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start = 0;
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*loc = 0;
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}
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} else {
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sm_bitvec_t w = map->m_data[1 +
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__sm_chunk_map_get_position(map, i * SM_FLAGS_PER_INDEX_BYTE + j)];
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for (size_t k = 0; k < idx; k++) {
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size_t ks = 0;
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if (*loc > 0) {
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if (*loc > idx) {
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ks = idx;
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*loc = *loc - idx;
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} else {
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ks += *loc;
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*loc = 0;
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}
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}
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for (size_t k = ks; k < idx; k++) {
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if (w & ((sm_bitvec_t)1 << k)) {
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ret++;
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}
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@ -1149,7 +1159,6 @@ sparsemap_select(sparsemap_t *map, size_t n)
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assert(sparsemap_get_size(map) >= SM_SIZEOF_OVERHEAD);
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size_t result = 0;
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size_t count = __sm_get_chunk_map_count(map);
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uint8_t *p = __sm_get_chunk_map_data(map, 0);
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for (size_t i = 0; i < count; i++) {
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@ -1158,7 +1167,7 @@ sparsemap_select(sparsemap_t *map, size_t n)
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__sm_chunk_t chunk;
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__sm_chunk_map_init(&chunk, p);
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ssize_t new_n = n;
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ssize_t new_n = (ssize_t)n;
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size_t index = __sm_chunk_map_select(&chunk, n, &new_n);
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if (new_n == -1) {
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return (result + index);
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@ -1200,7 +1209,7 @@ sparsemap_rank(sparsemap_t *map, size_t loc, size_t idx)
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continue;
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}
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result += __sm_chunk_map_rank(&chunk, loc, idx - start);
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result += __sm_chunk_map_rank(&chunk, &loc, idx - start);
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p += __sm_chunk_map_get_size(&chunk);
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}
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return (result);
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@ -1214,17 +1223,21 @@ sparsemap_rank(sparsemap_t *map, size_t loc, size_t idx)
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size_t
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sparsemap_span(sparsemap_t *map, size_t loc, size_t len)
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{
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size_t nth, count, size = 1024;
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size_t offset, nth = 0, count = 0;
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offset = sparsemap_select(map, 0);
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do {
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nth = sparsemap_select(map, nth);
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count = sparsemap_rank(map, nth, nth + len);
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count = sparsemap_rank(map, offset, offset + len);
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if (count == len) {
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return nth;
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return offset;
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} else {
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nth += count;
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count = len;
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while(--count && sparsemap_is_set(map, offset)) {
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nth++;
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}
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}
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} while (1); // TODO... ? until what?
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offset = sparsemap_select(map, nth);
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} while (1); // TODO...until what?
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return size;
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return 0;
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}
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