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https://github.com/RfidResearchGroup/proxmark3.git
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47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
#include "bucketsort.h"
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extern void bucket_sort_intersect(uint32_t* const estart, uint32_t* const estop,
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uint32_t* const ostart, uint32_t* const ostop,
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bucket_info_t *bucket_info, bucket_array_t bucket)
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{
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uint32_t *p1, *p2;
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uint32_t *start[2];
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uint32_t *stop[2];
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start[0] = estart;
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stop[0] = estop;
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start[1] = ostart;
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stop[1] = ostop;
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// init buckets to be empty
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for (uint32_t i = 0; i < 2; i++) {
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for (uint32_t j = 0x00; j <= 0xff; j++) {
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bucket[i][j].bp = bucket[i][j].head;
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}
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}
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// sort the lists into the buckets based on the MSB (contribution bits)
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for (uint32_t i = 0; i < 2; i++) {
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for (p1 = start[i]; p1 <= stop[i]; p1++) {
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uint32_t bucket_index = (*p1 & 0xff000000) >> 24;
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*(bucket[i][bucket_index].bp++) = *p1;
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}
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}
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// write back intersecting buckets as sorted list.
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// fill in bucket_info with head and tail of the bucket contents in the list and number of non-empty buckets.
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uint32_t nonempty_bucket;
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for (uint32_t i = 0; i < 2; i++) {
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p1 = start[i];
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nonempty_bucket = 0;
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for (uint32_t j = 0x00; j <= 0xff; j++) {
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if (bucket[0][j].bp != bucket[0][j].head && bucket[1][j].bp != bucket[1][j].head) { // non-empty intersecting buckets only
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bucket_info->bucket_info[i][nonempty_bucket].head = p1;
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for (p2 = bucket[i][j].head; p2 < bucket[i][j].bp; *p1++ = *p2++);
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bucket_info->bucket_info[i][nonempty_bucket].tail = p1 - 1;
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nonempty_bucket++;
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}
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}
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bucket_info->numbuckets = nonempty_bucket;
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}
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}
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