--- a/misc/libphysfs/lzma/C/Compress/Huffman/HuffmanEncode.c Thu Oct 11 23:43:31 2018 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,146 +0,0 @@
-/* Compress/HuffmanEncode.c */
-
-#include "HuffmanEncode.h"
-#include "../../Sort.h"
-
-#define kMaxLen 16
-#define NUM_BITS 10
-#define MASK ((1 << NUM_BITS) - 1)
-
-#define NUM_COUNTERS 64
-
-/* use BLOCK_SORT_EXTERNAL_FLAGS if blockSize > 1M */
-#define HUFFMAN_SPEED_OPT
-
-void Huffman_Generate(const UInt32 *freqs, UInt32 *p, Byte *lens, UInt32 numSymbols, UInt32 maxLen)
-{
- UInt32 num = 0;
- /* if (maxLen > 10) maxLen = 10; */
- {
- UInt32 i;
-
- #ifdef HUFFMAN_SPEED_OPT
-
- UInt32 counters[NUM_COUNTERS];
- for (i = 0; i < NUM_COUNTERS; i++)
- counters[i] = 0;
- for (i = 0; i < numSymbols; i++)
- {
- UInt32 freq = freqs[i];
- counters[(freq < NUM_COUNTERS - 1) ? freq : NUM_COUNTERS - 1]++;
- }
-
- for (i = 1; i < NUM_COUNTERS; i++)
- {
- UInt32 temp = counters[i];
- counters[i] = num;
- num += temp;
- }
-
- for (i = 0; i < numSymbols; i++)
- {
- UInt32 freq = freqs[i];
- if (freq == 0)
- lens[i] = 0;
- else
- p[counters[((freq < NUM_COUNTERS - 1) ? freq : NUM_COUNTERS - 1)]++] = i | (freq << NUM_BITS);
- }
- counters[0] = 0;
- HeapSort(p + counters[NUM_COUNTERS - 2], counters[NUM_COUNTERS - 1] - counters[NUM_COUNTERS - 2]);
-
- #else
-
- for (i = 0; i < numSymbols; i++)
- {
- UInt32 freq = freqs[i];
- if (freq == 0)
- lens[i] = 0;
- else
- p[num++] = i | (freq << NUM_BITS);
- }
- HeapSort(p, num);
-
- #endif
- }
-
- if (num < 2)
- {
- int minCode = 0;
- int maxCode = 1;
- if (num == 1)
- {
- maxCode = p[0] & MASK;
- if (maxCode == 0)
- maxCode++;
- }
- p[minCode] = 0;
- p[maxCode] = 1;
- lens[minCode] = lens[maxCode] = 1;
- return;
- }
-
- {
- UInt32 b, e, i;
-
- i = b = e = 0;
- do
- {
- UInt32 n, m, freq;
- n = (i != num && (b == e || (p[i] >> NUM_BITS) <= (p[b] >> NUM_BITS))) ? i++ : b++;
- freq = (p[n] & ~MASK);
- p[n] = (p[n] & MASK) | (e << NUM_BITS);
- m = (i != num && (b == e || (p[i] >> NUM_BITS) <= (p[b] >> NUM_BITS))) ? i++ : b++;
- freq += (p[m] & ~MASK);
- p[m] = (p[m] & MASK) | (e << NUM_BITS);
- p[e] = (p[e] & MASK) | freq;
- e++;
- }
- while (num - e > 1);
-
- {
- UInt32 lenCounters[kMaxLen + 1];
- for (i = 0; i <= kMaxLen; i++)
- lenCounters[i] = 0;
-
- p[--e] &= MASK;
- lenCounters[1] = 2;
- while (e > 0)
- {
- UInt32 len = (p[p[--e] >> NUM_BITS] >> NUM_BITS) + 1;
- p[e] = (p[e] & MASK) | (len << NUM_BITS);
- if (len >= maxLen)
- for (len = maxLen - 1; lenCounters[len] == 0; len--);
- lenCounters[len]--;
- lenCounters[len + 1] += 2;
- }
-
- {
- UInt32 len;
- i = 0;
- for (len = maxLen; len != 0; len--)
- {
- UInt32 num;
- for (num = lenCounters[len]; num != 0; num--)
- lens[p[i++] & MASK] = (Byte)len;
- }
- }
-
- {
- UInt32 nextCodes[kMaxLen + 1];
- {
- UInt32 code = 0;
- UInt32 len;
- for (len = 1; len <= kMaxLen; len++)
- nextCodes[len] = code = (code + lenCounters[len - 1]) << 1;
- }
- /* if (code + lenCounters[kMaxLen] - 1 != (1 << kMaxLen) - 1) throw 1; */
-
- {
- UInt32 i;
- for (i = 0; i < numSymbols; i++)
- p[i] = nextCodes[lens[i]]++;
- }
- }
- }
- }
-}