/* inftrees.c -- generate Huffman trees for efficient decoding * Copyright (C) 1995-2013 Mark Adler * For conditions of distribution and use, see copyright notice in zlib.h */ #include "zutil.h" #include "inftrees.h" #define MAXBITS 15 constcharinflate_copyright[] = " inflate 1.2.8 Copyright 1995-2013 Mark Adler "; /* If you use the zlib library in a product, an acknowledgment is welcome in the documentation of your product. If for some reason you cannot include such an acknowledgment, I would appreciate that you keep this copyright string in the executable of your product. */ /* Build a set of tables to decode the provided canonical Huffman code. The code lengths are lens[0..codes-1]. The result starts at *table, whose indices are 0..2^bits-1. work is a writable array of at least lens shorts, which is used as a work area. type is the type of code to be generated, CODES, LENS, or DISTS. On return, zero is success, -1 is an invalid code, and +1 means that ENOUGH isn't enough. table on return points to the next available entry's address. bits is the requested root table index bits, and on return it is the actual root table index bits. It will differ if the request is greater than the longest code or if it is less than the shortest code. */intZLIB_INTERNALinflate_table(type, lens, codes, table, bits, work) codetype type;unsignedshortFAR *lens;unsignedcodes; code FAR * FAR *table;unsignedFAR *bits;unsignedshortFAR *work;{unsignedlen; /* a code's length in bits */unsignedsym; /* index of code symbols */unsignedmin, max; /* minimum and maximum code lengths */unsignedroot; /* number of index bits for root table */unsignedcurr; /* number of index bits for current table */unsigneddrop; /* code bits to drop for sub-table */intleft; /* number of prefix codes available */unsignedused; /* code entries in table used */unsignedhuff; /* Huffman code */unsignedincr; /* for incrementing code, index */unsignedfill; /* index for replicating entries */unsignedlow; /* low bits for current root entry */unsignedmask; /* mask for low root bits */ code here; /* table entry for duplication */ code FAR *next; /* next available space in table */ constunsignedshortFAR *base; /* base value table to use */ constunsignedshortFAR *extra; /* extra bits table to use */intend; /* use base and extra for symbol > end */unsignedshortcount[MAXBITS+1]; /* number of codes of each length */unsignedshortoffs[MAXBITS+1]; /* offsets in table for each length */ static constunsignedshortlbase[31] ={/* Length codes 257..285 base */ 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31, 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0}; static constunsignedshortlext[31] ={/* Length codes 257..285 extra */ 16, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 18, 18, 18, 18, 19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 16, 72, 78}; static constunsignedshortdbase[32] ={/* Distance codes 0..29 base */ 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193, 257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577, 0, 0}; static constunsignedshortdext[32] ={/* Distance codes 0..29 extra */ 16, 16, 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 23, 24, 24, 25, 25, 26, 26, 27, 27, 28, 28, 29, 29, 64, 64}; /* Process a set of code lengths to create a canonical Huffman code. The code lengths are lens[0..codes-1]. Each length corresponds to the symbols 0..codes-1. The Huffman code is generated by first sorting the symbols by length from short to long, and retaining the symbol order for codes with equal lengths. Then the code starts with all zero bits for the first code of the shortest length, and the codes are integer increments for the same length, and zeros are appended as the length increases. For the deflate format, these bits are stored backwards from their more natural integer increment ordering, and so when the decoding tables are built in the large loop below, the integer codes are incremented backwards. This routine assumes, but does not check, that all of the entries in lens[] are in the range 0..MAXBITS. The caller must assure this. 1..MAXBITS is interpreted as that code length. zero means that that symbol does not occur in this code. The codes are sorted by computing a count of codes for each length, creating from that a table of starting indices for each length in the sorted table, and then entering the symbols in order in the sorted table. The sorted table is work[], with that space being provided by the caller. The length counts are used for other purposes as well, i.e. finding the minimum and maximum length codes, determining if there are any codes at all, checking for a valid set of lengths, and looking ahead at length counts to determine sub-table sizes when building the decoding tables. */ /* accumulate lengths for codes (assumes lens[] all in 0..MAXBITS) */ for (len = 0; len <= MAXBITS; len++) count[len] = 0; for (sym = 0; sym < codes; sym++) count[lens[sym]]++; /* bound code lengths, force root to be within code lengths */ root = *bits; for (max = MAXBITS; max >= 1; max--) if (count[max] != 0) break; if (root > max) root = max; if (max == 0){/* no symbols to code at all */ here.op = (unsignedchar)64; /* invalid code marker */ here.bits = (unsignedchar)1; here.val = (unsignedshort)0; *(*table)++ = here; /* make a table to force an error */ *(*table)++ = here; *bits = 1; return 0; /* no symbols, but wait for decoding to report error */}for (min = 1; min < max; min++) if (count[min] != 0) break; if (root < min) root = min; /* check for an over-subscribed or incomplete set of lengths */ left = 1; for (len = 1; len <= MAXBITS; len++){left <<= 1; left -= count[len]; if (left < 0) return -1; /* over-subscribed */}if (left > 0 && (type == CODES || max != 1)) return -1; /* incomplete set */ /* generate offsets into symbol table for each length for sorting */ offs[1] = 0; for (len = 1; len < MAXBITS; len++) offs[len + 1] = offs[len] + count[len]; /* sort symbols by length, by symbol order within each length */ for (sym = 0; sym < codes; sym++) if (lens[sym] != 0) work[offs[lens[sym]]++] = (unsignedshort)sym; /* Create and fill in decoding tables. In this loop, the table being filled is at next and has curr index bits. The code being used is huff with length len. That code is converted to an index by dropping drop bits off of the bottom. For codes where len is less than drop + curr, those top drop + curr - len bits are incremented through all values to fill the table with replicated entries. root is the number of index bits for the root table. When len exceeds root, sub-tables are created pointed to by the root entry with an index of the low root bits of huff. This is saved in low to check for when a new sub-table should be started. drop is zero when the root table is being filled, and drop is root when sub-tables are being filled. When a new sub-table is needed, it is necessary to look ahead in the code lengths to determine what size sub-table is needed. The length counts are used for this, and so count[] is decremented as codes are entered in the tables. used keeps track of how many table entries have been allocated from the provided *table space. It is checked for LENS and DIST tables against the constants ENOUGH_LENS and ENOUGH_DISTS to guard against changes in the initial root table size constants. See the comments in inftrees.h for more information. sym increments through all symbols, and the loop terminates when all codes of length max, i.e. all codes, have been processed. This routine permits incomplete codes, so another loop after this one fills in the rest of the decoding tables with invalid code markers. */ /* set up for code type */ switch (type){case CODES: base = extra = work; /* dummy value--not used */ end = 19; break; case LENS: base = lbase; base -= 257; extra = lext; extra -= 257; end = 256; break; default: /* DISTS */ base = dbase; extra = dext; end = -1;}/* initialize state for loop */ huff = 0; /* starting code */ sym = 0; /* starting code symbol */ len = min; /* starting code length */ next = *table; /* current table to fill in */ curr = root; /* current table index bits */ drop = 0; /* current bits to drop from code for index */ low = (unsigned)(-1); /* trigger new sub-table when len > root */ used = 1U << root; /* use root table entries */ mask = used - 1; /* mask for comparing low */ /* check available table space */ if ((type == LENS && used > ENOUGH_LENS) || (type == DISTS && used > ENOUGH_DISTS)) return 1; /* process all codes and make table entries */ for (;;){/* create table entry */ here.bits = (unsignedchar)(len - drop); if ((int)(work[sym]) < end){here.op = (unsignedchar)0; here.val = work[sym];}else if ((int)(work[sym]) > end){here.op = (unsignedchar)(extra[work[sym]]); here.val = base[work[sym]];}else{here.op = (unsignedchar)(32 + 64); /* end of block */ here.val = 0;}/* replicate for those indices with low len bits equal to huff */ incr = 1U << (len - drop); fill = 1U << curr; min = fill; /* save offset to next table */ do{fill -= incr; next[(huff >> drop) + fill] = here;}while (fill != 0); /* backwards increment the len-bit code huff */ incr = 1U << (len - 1); while (huff & incr) incr >>= 1; if (incr != 0){huff &= incr - 1; huff += incr;}else huff = 0; /* go to next symbol, update count, len */ sym++; if (--(count[len]) == 0){if (len == max) break; len = lens[work[sym]];}/* create new sub-table if needed */ if (len > root && (huff & mask) != low){/* if first time, transition to sub-tables */ if (drop == 0) drop = root; /* increment past last table */ next += min; /* here min is 1 << curr */ /* determine length of next table */ curr = len - drop; left = (int)(1 << curr); while (curr + drop < max){left -= count[curr + drop]; if (left <= 0) break; curr++; left <<= 1;}/* check for enough space */ used += 1U << curr; if ((type == LENS && used > ENOUGH_LENS) || (type == DISTS && used > ENOUGH_DISTS)) return 1; /* point entry in root table to sub-table */ low = huff & mask; (*table)[low].op = (unsignedchar)curr; (*table)[low].bits = (unsignedchar)root; (*table)[low].val = (unsignedshort)(next - *table);}}/* fill in remaining table entry if code is incomplete (guaranteed to have at most one remaining entry, since if the code is incomplete, the maximum code length that was allowed to get this far is one bit) */ if (huff != 0){here.op = (unsignedchar)64; /* invalid code marker */ here.bits = (unsignedchar)(len - drop); here.val = (unsignedshort)0; next[huff] = here;}/* set return parameters */ *table += used; *bits = root; return 0;}