*/
#include "rsync.h"
+#include "lib/zlib.h"
extern int do_compression;
/* non-compressing recv token */
static int simple_recv_token(int f,char **data)
{
- static int residue = 0;
- static char *buf = NULL;
+ static int residue;
+ static char *buf;
int n;
if (!buf) {
}
+/* Memory allocation/freeing routines, called by zlib stuff. */
+static void *
+z_alloc(void *opaque, uInt items, uInt size)
+{
+ return malloc(items * size);
+}
+
+static void
+z_free(void *opaque, void *adrs, uInt nbytes)
+{
+ free(adrs);
+}
+
+/* Flag bytes in compressed stream are encoded as follows: */
+#define END_FLAG 0 /* that's all folks */
+#define TOKEN_LONG 0x20 /* followed by 32-bit token number */
+#define TOKENRUN_LONG 0x21 /* ditto with 16-bit run count */
+#define DEFLATED_DATA 0x40 /* + 6-bit high len, then low len byte */
+#define TOKEN_REL 0x80 /* + 6-bit relative token number */
+#define TOKENRUN_REL 0xc0 /* ditto with 16-bit run count */
+
+#define MAX_DATA_COUNT 16383 /* fit 14 bit count into 2 bytes with flags */
+
+/* For coding runs of tokens */
+static int last_token = -1;
+static int run_start;
+static int last_run_end;
+
+/* Deflation state */
+static z_stream tx_strm;
+
+/* Output buffer */
+static char *obuf;
+
+/* Send a deflated token */
+static void
+send_deflated_token(int f, int token,
+ struct map_struct *buf, int offset, int nb, int toklen)
+{
+ int n, r;
+ static int init_done;
+
+ if (last_token == -1) {
+ /* initialization */
+ if (!init_done) {
+ tx_strm.next_in = NULL;
+ tx_strm.zalloc = z_alloc;
+ tx_strm.zfree = z_free;
+ if (deflateInit2(&tx_strm, Z_DEFAULT_COMPRESSION, 8,
+ -15, 8, Z_DEFAULT_STRATEGY) != Z_OK) {
+ rprintf(FERROR, "compression init failed\n");
+ exit_cleanup(1);
+ }
+ if ((obuf = malloc(MAX_DATA_COUNT+2)) == NULL)
+ out_of_memory("send_deflated_token");
+ init_done = 1;
+ } else
+ deflateReset(&tx_strm);
+ run_start = token;
+ last_run_end = 0;
+
+ } else if (nb != 0 || token != last_token + 1
+ || token >= run_start + 65536) {
+ /* output previous run */
+ r = run_start - last_run_end;
+ n = last_token - run_start;
+ if (r >= 0 && r <= 63) {
+ write_byte(f, (n==0? TOKEN_REL: TOKENRUN_REL) + r);
+ } else {
+ write_byte(f, (n==0? TOKEN_LONG: TOKENRUN_LONG));
+ write_int(f, run_start);
+ }
+ if (n != 0) {
+ write_byte(f, n);
+ write_byte(f, n >> 8);
+ }
+ last_run_end = last_token;
+ run_start = token;
+ }
+
+ last_token = token;
+
+ if (nb != 0) {
+ /* deflate the data starting at offset */
+ tx_strm.avail_in = 0;
+ tx_strm.avail_out = 0;
+ do {
+ if (tx_strm.avail_in == 0 && nb != 0) {
+ /* give it some more input */
+ n = MIN(nb, CHUNK_SIZE);
+ tx_strm.next_in = (Bytef *)map_ptr(buf, offset, n);
+ tx_strm.avail_in = n;
+ nb -= n;
+ offset += n;
+ }
+ if (tx_strm.avail_out == 0) {
+ tx_strm.next_out = (Bytef *)(obuf + 2);
+ tx_strm.avail_out = MAX_DATA_COUNT;
+ }
+ r = deflate(&tx_strm, nb? Z_NO_FLUSH: Z_PACKET_FLUSH);
+ if (r != Z_OK) {
+ rprintf(FERROR, "deflate returned %d\n", r);
+ exit_cleanup(1);
+ }
+ if (nb == 0 || tx_strm.avail_out == 0) {
+ n = MAX_DATA_COUNT - tx_strm.avail_out;
+ if (n > 0) {
+ obuf[0] = DEFLATED_DATA + (n >> 8);
+ obuf[1] = n;
+ write_buf(f, obuf, n+2);
+ }
+ }
+ } while (nb != 0 || tx_strm.avail_out == 0);
+ }
+
+ if (token != -1) {
+ /* add the data in the current block to the compressor's
+ history and hash table */
+ tx_strm.next_in = (Bytef *)map_ptr(buf, offset, toklen);
+ tx_strm.avail_in = toklen;
+ tx_strm.next_out = NULL;
+ tx_strm.avail_out = 2 * toklen;
+ r = deflate(&tx_strm, Z_INSERT_ONLY);
+ if (r != Z_OK || tx_strm.avail_in != 0) {
+ rprintf(FERROR, "deflate on token returned %d (%d bytes left)\n",
+ r, tx_strm.avail_in);
+ exit_cleanup(1);
+ }
+
+ } else {
+ /* end of file - clean up */
+ write_byte(f, END_FLAG);
+ }
+}
+
+/* tells us what the receiver is in the middle of doing */
+static enum { r_init, r_idle, r_running, r_inflating, r_inflated } recv_state;
+
+/* for inflating stuff */
+static z_stream rx_strm;
+static char *cbuf;
+static char *dbuf;
+
+/* for decoding runs of tokens */
+static int rx_token;
+static int rx_run;
+
+/* Receive a deflated token and inflate it */
+static int
+recv_deflated_token(int f, char **data)
+{
+ int n, r, flag;
+ static int init_done;
+ static int saved_flag;
+
+ for (;;) {
+ switch (recv_state) {
+ case r_init:
+ if (!init_done) {
+ rx_strm.next_out = NULL;
+ rx_strm.zalloc = z_alloc;
+ rx_strm.zfree = z_free;
+ if (inflateInit2(&rx_strm, -15) != Z_OK) {
+ rprintf(FERROR, "inflate init failed\n");
+ exit_cleanup(1);
+ }
+ if ((cbuf = malloc(MAX_DATA_COUNT)) == NULL
+ || (dbuf = malloc(CHUNK_SIZE)) == NULL)
+ out_of_memory("recv_deflated_token");
+ init_done = 1;
+ } else {
+ inflateReset(&rx_strm);
+ }
+ recv_state = r_idle;
+ rx_token = 0;
+ break;
+
+ case r_idle:
+ case r_inflated:
+ if (saved_flag) {
+ flag = saved_flag & 0xff;
+ saved_flag = 0;
+ } else
+ flag = read_byte(f);
+ if ((flag & 0xC0) == DEFLATED_DATA) {
+ n = ((flag & 0x3f) << 8) + read_byte(f);
+ read_buf(f, cbuf, n);
+ rx_strm.next_in = (Bytef *)cbuf;
+ rx_strm.avail_in = n;
+ recv_state = r_inflating;
+ break;
+ }
+ if (recv_state == r_inflated) {
+ /* check previous inflated stuff ended correctly */
+ rx_strm.avail_in = 0;
+ rx_strm.next_out = (Bytef *)dbuf;
+ rx_strm.avail_out = CHUNK_SIZE;
+ r = inflate(&rx_strm, Z_PACKET_FLUSH);
+ n = CHUNK_SIZE - rx_strm.avail_out;
+ if (r != Z_OK) {
+ rprintf(FERROR, "inflate flush returned %d (%d bytes)\n",
+ r, n);
+ exit_cleanup(1);
+ }
+ if (n != 0) {
+ /* have to return some more data and
+ save the flag for later. */
+ saved_flag = flag + 0x10000;
+ if (rx_strm.avail_out != 0)
+ recv_state = r_idle;
+ *data = dbuf;
+ return n;
+ }
+ recv_state = r_idle;
+ }
+ if (flag == END_FLAG) {
+ /* that's all folks */
+ recv_state = r_init;
+ return 0;
+ }
+
+ /* here we have a token of some kind */
+ if (flag & TOKEN_REL) {
+ rx_token += flag & 0x3f;
+ flag >>= 6;
+ } else
+ rx_token = read_int(f);
+ if (flag & 1) {
+ rx_run = read_byte(f);
+ rx_run += read_byte(f) << 8;
+ recv_state = r_running;
+ }
+ return -1 - rx_token;
+
+ case r_inflating:
+ rx_strm.next_out = (Bytef *)dbuf;
+ rx_strm.avail_out = CHUNK_SIZE;
+ r = inflate(&rx_strm, Z_NO_FLUSH);
+ n = CHUNK_SIZE - rx_strm.avail_out;
+ if (r != Z_OK) {
+ rprintf(FERROR, "inflate returned %d (%d bytes)\n", r, n);
+ exit_cleanup(1);
+ }
+ if (rx_strm.avail_in == 0)
+ recv_state = r_inflated;
+ if (n != 0) {
+ *data = dbuf;
+ return n;
+ }
+ break;
+
+ case r_running:
+ ++rx_token;
+ if (--rx_run == 0)
+ recv_state = r_idle;
+ return -1 - rx_token;
+ }
+ }
+}
+
+/*
+ * put the data corresponding to a token that we've just returned
+ * from recv_deflated_token into the decompressor's history buffer.
+ */
+void
+see_deflate_token(char *buf, int len)
+{
+ int r;
+
+ rx_strm.next_in = (Bytef *)buf;
+ rx_strm.avail_in = len;
+ r = inflateIncomp(&rx_strm);
+ if (r != Z_OK) {
+ rprintf(FERROR, "inflateIncomp returned %d\n", r);
+ exit_cleanup(1);
+ }
+}
/*
* transmit a verbatim buffer of length n followed by a token
{
if (!do_compression) {
simple_send_token(f,token,buf,offset,n);
- return;
+ } else {
+ send_deflated_token(f, token, buf, offset, n, toklen);
}
-
- /* compressed transmit here */
}
*/
int recv_token(int f,char **data)
{
+ int tok;
+
if (!do_compression) {
- return simple_recv_token(f,data);
+ tok = simple_recv_token(f,data);
+ } else {
+ tok = recv_deflated_token(f, data);
}
+ return tok;
+}
- /* compressed receive here */
- return 0;
+/*
+ * 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);
}
Matt McCutchen's Web Site / rsync / rsync.git / blobdiff