/* trees.c -- output deflated data using Huffman coding
- * Copyright (C) 1995-1998 Jean-loup Gailly
+ * Copyright (C) 1995-2002 Jean-loup Gailly
* For conditions of distribution and use, see copyright notice in zlib.h
*/
#endif /* DEBUG */
-#define MAX(a,b) (a >= b ? a : b)
+#ifndef MAX
+#define MAX(a,b) ((a) >= (b) ? (a) : (b))
+#endif
/* the arguments must not have side effects */
/* ===========================================================================
if (static_init_done) return;
+ /* For some embedded targets, global variables are not initialized: */
+ static_l_desc.static_tree = static_ltree;
+ static_l_desc.extra_bits = extra_lbits;
+ static_d_desc.static_tree = static_dtree;
+ static_d_desc.extra_bits = extra_dbits;
+ static_bl_desc.extra_bits = extra_blbits;
+
/* Initialize the mapping length (0..255) -> length code (0..28) */
length = 0;
for (code = 0; code < LENGTH_CODES-1; code++) {
{
tr_static_init();
- s->compressed_len = 0L;
-
s->l_desc.dyn_tree = s->dyn_ltree;
s->l_desc.stat_desc = &static_l_desc;
s->bi_valid = 0;
s->last_eob_len = 8; /* enough lookahead for inflate */
#ifdef DEBUG
+ s->compressed_len = 0L;
s->bits_sent = 0L;
#endif
int bits; /* bit length */
int xbits; /* extra bits */
ush f; /* frequency */
- int overflow = 0; /* number of elements with bit length too large */
+ int Overflow = 0; /* number of elements with bit length too large */
for (bits = 0; bits <= MAX_BITS; bits++) s->bl_count[bits] = 0;
for (h = s->heap_max+1; h < HEAP_SIZE; h++) {
n = s->heap[h];
bits = tree[tree[n].Dad].Len + 1;
- if (bits > max_length) bits = max_length, overflow++;
+ if (bits > max_length) bits = max_length, Overflow++;
tree[n].Len = (ush)bits;
/* We overwrite tree[n].Dad which is no longer needed */
s->opt_len += (ulg)f * (bits + xbits);
if (stree) s->static_len += (ulg)f * (stree[n].Len + xbits);
}
- if (overflow == 0) return;
+ if (Overflow == 0) return;
Trace((stderr,"\nbit length overflow\n"));
/* This happens for example on obj2 and pic of the Calgary corpus */
/* The brother of the overflow item also moves one step up,
* but this does not affect bl_count[max_length]
*/
- overflow -= 2;
- } while (overflow > 0);
+ Overflow -= 2;
+ } while (Overflow > 0);
/* Now recompute all bit lengths, scanning in increasing frequency.
* h is still equal to HEAP_SIZE. (It is simpler to reconstruct all
int eof; /* true if this is the last block for a file */
{
send_bits(s, (STORED_BLOCK<<1)+eof, 3); /* send block type */
+#ifdef DEBUG
s->compressed_len = (s->compressed_len + 3 + 7) & (ulg)~7L;
s->compressed_len += (stored_len + 4) << 3;
-
+#endif
copy_block(s, buf, (unsigned)stored_len, 1); /* with header */
}
{
send_bits(s, STATIC_TREES<<1, 3);
send_code(s, END_BLOCK, static_ltree);
+#ifdef DEBUG
s->compressed_len += 10L; /* 3 for block type, 7 for EOB */
+#endif
bi_flush(s);
/* Of the 10 bits for the empty block, we have already sent
* (10 - bi_valid) bits. The lookahead for the last real code (before
if (1 + s->last_eob_len + 10 - s->bi_valid < 9) {
send_bits(s, STATIC_TREES<<1, 3);
send_code(s, END_BLOCK, static_ltree);
+#ifdef DEBUG
s->compressed_len += 10L;
+#endif
bi_flush(s);
}
s->last_eob_len = 7;
/* ===========================================================================
* Determine the best encoding for the current block: dynamic trees, static
- * trees or store, and output the encoded block to the zip file. This function
- * returns the total compressed length for the file so far.
+ * trees or store, and output the encoded block to the zip file.
*/
-ulg _tr_flush_block(s, buf, stored_len, eof)
+void _tr_flush_block(s, buf, stored_len, eof)
deflate_state *s;
charf *buf; /* input block, or NULL if too old */
ulg stored_len; /* length of input block */
opt_lenb = static_lenb = stored_len + 5; /* force a stored block */
}
- /* If compression failed and this is the first and last block,
- * and if the .zip file can be seeked (to rewrite the local header),
- * the whole file is transformed into a stored file:
- */
-#ifdef STORED_FILE_OK
-# ifdef FORCE_STORED_FILE
- if (eof && s->compressed_len == 0L) { /* force stored file */
-# else
- if (stored_len <= opt_lenb && eof && s->compressed_len==0L && seekable()) {
-# endif
- /* Since LIT_BUFSIZE <= 2*WSIZE, the input data must be there: */
- if (buf == (charf*)0) error ("block vanished");
-
- copy_block(buf, (unsigned)stored_len, 0); /* without header */
- s->compressed_len = stored_len << 3;
- s->method = STORED;
- } else
-#endif /* STORED_FILE_OK */
-
#ifdef FORCE_STORED
if (buf != (char*)0) { /* force stored block */
#else
#endif
send_bits(s, (STATIC_TREES<<1)+eof, 3);
compress_block(s, (ct_data *)static_ltree, (ct_data *)static_dtree);
+#ifdef DEBUG
s->compressed_len += 3 + s->static_len;
+#endif
} else {
send_bits(s, (DYN_TREES<<1)+eof, 3);
send_all_trees(s, s->l_desc.max_code+1, s->d_desc.max_code+1,
max_blindex+1);
compress_block(s, (ct_data *)s->dyn_ltree, (ct_data *)s->dyn_dtree);
+#ifdef DEBUG
s->compressed_len += 3 + s->opt_len;
+#endif
}
Assert (s->compressed_len == s->bits_sent, "bad compressed size");
+ /* The above check is made mod 2^32, for files larger than 512 MB
+ * and uLong implemented on 32 bits.
+ */
init_block(s);
if (eof) {
bi_windup(s);
+#ifdef DEBUG
s->compressed_len += 7; /* align on byte boundary */
+#endif
}
Tracev((stderr,"\ncomprlen %lu(%lu) ", s->compressed_len>>3,
s->compressed_len-7*eof));
-
- return s->compressed_len >> 3;
}
/* ===========================================================================
Matt McCutchen's Web Site / rsync / rsync.git / blobdiff