519 lines
13 KiB
C
519 lines
13 KiB
C
/*
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Copyright (C) Andrew Tridgell 1996
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Copyright (C) Paul Mackerras 1996
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "rsync.h"
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#include "zlib/zlib.h"
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extern int do_compression;
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static int compression_level = Z_DEFAULT_COMPRESSION;
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/* determine the compression level based on a wildcard filename list */
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void set_compression(char *fname)
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{
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extern int module_id;
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char *dont;
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char *tok;
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if (!do_compression) return;
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compression_level = Z_DEFAULT_COMPRESSION;
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dont = lp_dont_compress(module_id);
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if (!dont || !*dont) return;
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if ((dont[0] == '*') && (!dont[1])) {
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/* an optimization to skip the rest of this routine */
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compression_level = 0;
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return;
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}
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dont = strdup(dont);
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fname = strdup(fname);
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if (!dont || !fname) return;
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strlower(dont);
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strlower(fname);
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for (tok=strtok(dont," ");tok;tok=strtok(NULL," ")) {
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if (fnmatch(tok, fname, 0) == 0) {
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compression_level = 0;
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break;
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}
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}
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free(dont);
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free(fname);
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}
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/* non-compressing recv token */
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static int simple_recv_token(int f,char **data)
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{
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static int residue;
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static char *buf;
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int n;
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if (!buf) {
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buf = (char *)malloc(CHUNK_SIZE);
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if (!buf) out_of_memory("simple_recv_token");
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}
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if (residue == 0) {
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int i = read_int(f);
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if (i <= 0) return i;
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residue = i;
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}
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*data = buf;
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n = MIN(CHUNK_SIZE,residue);
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residue -= n;
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read_buf(f,buf,n);
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return n;
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}
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/* non-compressing send token */
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static void simple_send_token(int f,int token,
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struct map_struct *buf,OFF_T offset,int n)
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{
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extern int write_batch; /* dw */
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int hold_int; /* dw */
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if (n > 0) {
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int l = 0;
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while (l < n) {
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int n1 = MIN(CHUNK_SIZE,n-l);
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write_int(f,n1);
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write_buf(f,map_ptr(buf,offset+l,n1),n1);
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if (write_batch) {
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write_batch_delta_file( (char *) &n1, sizeof(int) );
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write_batch_delta_file(map_ptr(buf,offset+l,n1),n1);
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}
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l += n1;
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}
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}
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/* a -2 token means to send data only and no token */
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if (token != -2) {
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write_int(f,-(token+1));
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if (write_batch) {
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hold_int = -(token+1);
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write_batch_delta_file( (char *) &hold_int, sizeof(int) );
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}
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}
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}
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/* Flag bytes in compressed stream are encoded as follows: */
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#define END_FLAG 0 /* that's all folks */
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#define TOKEN_LONG 0x20 /* followed by 32-bit token number */
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#define TOKENRUN_LONG 0x21 /* ditto with 16-bit run count */
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#define DEFLATED_DATA 0x40 /* + 6-bit high len, then low len byte */
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#define TOKEN_REL 0x80 /* + 6-bit relative token number */
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#define TOKENRUN_REL 0xc0 /* ditto with 16-bit run count */
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#define MAX_DATA_COUNT 16383 /* fit 14 bit count into 2 bytes with flags */
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/* For coding runs of tokens */
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static int last_token = -1;
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static int run_start;
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static int last_run_end;
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/* Deflation state */
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static z_stream tx_strm;
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/* Output buffer */
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static char *obuf;
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/* Send a deflated token */
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static void
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send_deflated_token(int f, int token,
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struct map_struct *buf, OFF_T offset, int nb, int toklen)
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{
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int n, r;
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static int init_done, flush_pending;
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extern int write_batch; /* dw */
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char temp_byte; /* dw */
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if (last_token == -1) {
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/* initialization */
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if (!init_done) {
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tx_strm.next_in = NULL;
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tx_strm.zalloc = NULL;
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tx_strm.zfree = NULL;
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if (deflateInit2(&tx_strm, compression_level,
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Z_DEFLATED, -15, 8,
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Z_DEFAULT_STRATEGY) != Z_OK) {
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rprintf(FERROR, "compression init failed\n");
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exit_cleanup(RERR_STREAMIO);
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}
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if ((obuf = malloc(MAX_DATA_COUNT+2)) == NULL)
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out_of_memory("send_deflated_token");
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init_done = 1;
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} else
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deflateReset(&tx_strm);
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last_run_end = 0;
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run_start = token;
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flush_pending = 0;
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} else if (last_token == -2) {
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run_start = token;
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} else if (nb != 0 || token != last_token + 1
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|| token >= run_start + 65536) {
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/* output previous run */
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r = run_start - last_run_end;
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n = last_token - run_start;
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if (r >= 0 && r <= 63) {
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write_byte(f, (n==0? TOKEN_REL: TOKENRUN_REL) + r);
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if (write_batch) { /* dw */
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temp_byte = (char)( (n==0? TOKEN_REL: TOKENRUN_REL) + r);
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write_batch_delta_file(&temp_byte,sizeof(char));
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}
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} else {
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write_byte(f, (n==0? TOKEN_LONG: TOKENRUN_LONG));
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write_int(f, run_start);
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if (write_batch) { /* dw */
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temp_byte = (char)(n==0? TOKEN_LONG: TOKENRUN_LONG);
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write_batch_delta_file(&temp_byte,sizeof(temp_byte));
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write_batch_delta_file((char *)&run_start,sizeof(run_start));
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}
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}
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if (n != 0) {
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write_byte(f, n);
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write_byte(f, n >> 8);
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if (write_batch) { /* dw */
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write_batch_delta_file((char *)&n,sizeof(char));
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temp_byte = (char) n >> 8;
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write_batch_delta_file(&temp_byte,sizeof(temp_byte));
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}
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}
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last_run_end = last_token;
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run_start = token;
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}
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last_token = token;
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if (nb != 0 || flush_pending) {
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/* deflate the data starting at offset */
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int flush = Z_NO_FLUSH;
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tx_strm.avail_in = 0;
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tx_strm.avail_out = 0;
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do {
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if (tx_strm.avail_in == 0 && nb != 0) {
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/* give it some more input */
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n = MIN(nb, CHUNK_SIZE);
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tx_strm.next_in = (Bytef *)
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map_ptr(buf, offset, n);
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tx_strm.avail_in = n;
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nb -= n;
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offset += n;
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}
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if (tx_strm.avail_out == 0) {
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tx_strm.next_out = (Bytef *)(obuf + 2);
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tx_strm.avail_out = MAX_DATA_COUNT;
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if (flush != Z_NO_FLUSH) {
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/*
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* We left the last 4 bytes in the
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* buffer, in case they are the
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* last 4. Move them to the front.
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*/
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memcpy(tx_strm.next_out,
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obuf+MAX_DATA_COUNT-2, 4);
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tx_strm.next_out += 4;
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tx_strm.avail_out -= 4;
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}
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}
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if (nb == 0 && token != -2)
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flush = Z_SYNC_FLUSH;
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r = deflate(&tx_strm, flush);
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if (r != Z_OK) {
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rprintf(FERROR, "deflate returned %d\n", r);
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exit_cleanup(RERR_STREAMIO);
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}
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if (nb == 0 || tx_strm.avail_out == 0) {
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n = MAX_DATA_COUNT - tx_strm.avail_out;
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if (flush != Z_NO_FLUSH) {
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/*
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* We have to trim off the last 4
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* bytes of output when flushing
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* (they are just 0, 0, ff, ff).
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*/
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n -= 4;
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}
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if (n > 0) {
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obuf[0] = DEFLATED_DATA + (n >> 8);
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obuf[1] = n;
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write_buf(f, obuf, n+2);
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if (write_batch) /* dw */
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write_batch_delta_file(obuf,n+2);
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}
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}
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} while (nb != 0 || tx_strm.avail_out == 0);
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flush_pending = token == -2;
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}
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if (token == -1) {
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/* end of file - clean up */
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write_byte(f, END_FLAG);
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if (write_batch) { /* dw */
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temp_byte = END_FLAG;
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write_batch_delta_file((char *)&temp_byte,sizeof(temp_byte));
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}
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} else if (token != -2) {
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/* add the data in the current block to the compressor's
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history and hash table */
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tx_strm.next_in = (Bytef *) map_ptr(buf, offset, toklen);
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tx_strm.avail_in = toklen;
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tx_strm.next_out = (Bytef *) obuf;
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tx_strm.avail_out = MAX_DATA_COUNT;
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r = deflate(&tx_strm, Z_INSERT_ONLY);
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if (r != Z_OK || tx_strm.avail_in != 0) {
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rprintf(FERROR, "deflate on token returned %d (%d bytes left)\n",
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r, tx_strm.avail_in);
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exit_cleanup(RERR_STREAMIO);
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}
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}
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}
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/* tells us what the receiver is in the middle of doing */
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static enum { r_init, r_idle, r_running, r_inflating, r_inflated } recv_state;
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/* for inflating stuff */
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static z_stream rx_strm;
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static char *cbuf;
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static char *dbuf;
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/* for decoding runs of tokens */
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static int rx_token;
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static int rx_run;
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/* Receive a deflated token and inflate it */
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static int
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recv_deflated_token(int f, char **data)
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{
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int n, r, flag;
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static int init_done;
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static int saved_flag;
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for (;;) {
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switch (recv_state) {
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case r_init:
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if (!init_done) {
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rx_strm.next_out = NULL;
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rx_strm.zalloc = NULL;
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rx_strm.zfree = NULL;
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if (inflateInit2(&rx_strm, -15) != Z_OK) {
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rprintf(FERROR, "inflate init failed\n");
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exit_cleanup(RERR_STREAMIO);
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}
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if ((cbuf = malloc(MAX_DATA_COUNT)) == NULL
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|| (dbuf = malloc(CHUNK_SIZE)) == NULL)
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out_of_memory("recv_deflated_token");
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init_done = 1;
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} else {
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inflateReset(&rx_strm);
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}
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recv_state = r_idle;
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rx_token = 0;
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break;
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case r_idle:
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case r_inflated:
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if (saved_flag) {
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flag = saved_flag & 0xff;
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saved_flag = 0;
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} else
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flag = read_byte(f);
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if ((flag & 0xC0) == DEFLATED_DATA) {
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n = ((flag & 0x3f) << 8) + read_byte(f);
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read_buf(f, cbuf, n);
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rx_strm.next_in = (Bytef *)cbuf;
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rx_strm.avail_in = n;
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recv_state = r_inflating;
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break;
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}
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if (recv_state == r_inflated) {
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/* check previous inflated stuff ended correctly */
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rx_strm.avail_in = 0;
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rx_strm.next_out = (Bytef *)dbuf;
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rx_strm.avail_out = CHUNK_SIZE;
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r = inflate(&rx_strm, Z_SYNC_FLUSH);
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n = CHUNK_SIZE - rx_strm.avail_out;
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/*
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* Z_BUF_ERROR just means no progress was
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* made, i.e. the decompressor didn't have
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* any pending output for us.
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*/
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if (r != Z_OK && r != Z_BUF_ERROR) {
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rprintf(FERROR, "inflate flush returned %d (%d bytes)\n",
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r, n);
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exit_cleanup(RERR_STREAMIO);
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}
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if (n != 0 && r != Z_BUF_ERROR) {
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/* have to return some more data and
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save the flag for later. */
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saved_flag = flag + 0x10000;
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*data = dbuf;
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return n;
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}
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/*
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* At this point the decompressor should
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* be expecting to see the 0, 0, ff, ff bytes.
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*/
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if (!inflateSyncPoint(&rx_strm)) {
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rprintf(FERROR, "decompressor lost sync!\n");
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exit_cleanup(RERR_STREAMIO);
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}
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rx_strm.avail_in = 4;
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rx_strm.next_in = (Bytef *)cbuf;
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cbuf[0] = cbuf[1] = 0;
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cbuf[2] = cbuf[3] = 0xff;
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inflate(&rx_strm, Z_SYNC_FLUSH);
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recv_state = r_idle;
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}
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if (flag == END_FLAG) {
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/* that's all folks */
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recv_state = r_init;
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return 0;
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}
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/* here we have a token of some kind */
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if (flag & TOKEN_REL) {
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rx_token += flag & 0x3f;
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flag >>= 6;
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} else
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rx_token = read_int(f);
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if (flag & 1) {
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rx_run = read_byte(f);
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rx_run += read_byte(f) << 8;
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recv_state = r_running;
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}
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return -1 - rx_token;
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case r_inflating:
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rx_strm.next_out = (Bytef *)dbuf;
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rx_strm.avail_out = CHUNK_SIZE;
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r = inflate(&rx_strm, Z_NO_FLUSH);
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n = CHUNK_SIZE - rx_strm.avail_out;
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if (r != Z_OK) {
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rprintf(FERROR, "inflate returned %d (%d bytes)\n", r, n);
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exit_cleanup(RERR_STREAMIO);
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}
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if (rx_strm.avail_in == 0)
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recv_state = r_inflated;
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if (n != 0) {
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*data = dbuf;
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return n;
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}
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break;
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case r_running:
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++rx_token;
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if (--rx_run == 0)
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recv_state = r_idle;
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return -1 - rx_token;
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}
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}
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}
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/*
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* put the data corresponding to a token that we've just returned
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* from recv_deflated_token into the decompressor's history buffer.
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*/
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static void see_deflate_token(char *buf, int len)
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{
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int r, blklen;
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unsigned char hdr[5];
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rx_strm.avail_in = 0;
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blklen = 0;
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hdr[0] = 0;
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do {
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if (rx_strm.avail_in == 0 && len != 0) {
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if (blklen == 0) {
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/* Give it a fake stored-block header. */
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rx_strm.next_in = (Bytef *)hdr;
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rx_strm.avail_in = 5;
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blklen = len;
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if (blklen > 0xffff)
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blklen = 0xffff;
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hdr[1] = blklen;
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hdr[2] = blklen >> 8;
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hdr[3] = ~hdr[1];
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hdr[4] = ~hdr[2];
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} else {
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rx_strm.next_in = (Bytef *)buf;
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rx_strm.avail_in = blklen;
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len -= blklen;
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blklen = 0;
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}
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}
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rx_strm.next_out = (Bytef *)dbuf;
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rx_strm.avail_out = CHUNK_SIZE;
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r = inflate(&rx_strm, Z_SYNC_FLUSH);
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if (r != Z_OK) {
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rprintf(FERROR, "inflate (token) returned %d\n", r);
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exit_cleanup(RERR_STREAMIO);
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}
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} while (len || rx_strm.avail_out == 0);
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}
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/**
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* Transmit a verbatim buffer of length @p n followed by a token.
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* If token == -1 then we have reached EOF
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* If n == 0 then don't send a buffer
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*/
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void send_token(int f,int token,struct map_struct *buf,OFF_T offset,
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int n,int toklen)
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{
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if (!do_compression) {
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simple_send_token(f,token,buf,offset,n);
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} else {
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send_deflated_token(f, token, buf, offset, n, toklen);
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}
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}
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/*
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* receive a token or buffer from the other end. If the reurn value is >0 then
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* it is a data buffer of that length, and *data will point at the data.
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* if the return value is -i then it represents token i-1
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* if the return value is 0 then the end has been reached
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*/
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int recv_token(int f,char **data)
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{
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int tok;
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if (!do_compression) {
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tok = simple_recv_token(f,data);
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} else {
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tok = recv_deflated_token(f, data);
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}
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return tok;
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}
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|
|
|
/*
|
|
* look at the data corresponding to a token, if necessary
|
|
*/
|
|
void see_token(char *data, int toklen)
|
|
{
|
|
if (do_compression)
|
|
see_deflate_token(data, toklen);
|
|
}
|