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+/*= -*- c-basic-offset: 4; indent-tabs-mode: nil; -*-
+ *
+ * librsync -- library for network deltas
+ * $Id$
+ *
+ * Copyright (C) 2000, 2001 by Martin Pool <mbp@samba.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+ /*
+ | You should never wear your best
+ | trousers when you go out to fight for
+ | freedom and liberty.
+ | -- Henrik Ibsen
+ */
+
+
+/** \file rsync.h
+ *
+ * \brief Main public interface to librsync.
+ * \author Martin Pool <mbp@samba.org>
+ * \version librsync-0.9.1
+ *
+ * $Id$
+ *
+ * See \ref intro for an introduction to use of this library.
+ */
+
+#include <sys/types.h>
+
+extern char const rs_librsync_version[];
+extern char const rs_licence_string[];
+
+
+/**
+ * \brief A long integer type that can handle the largest file
+ * offsets.
+ *
+ * Perhaps this might have to be configured to be 'long long', 'long',
+ * or something else depending on the platform.
+ */
+#if SIZEOF_LONG_LONG
+typedef signed long long rs_long_t;
+#else
+typedef long rs_long_t;
+#endif
+
+
+/**
+ * \brief Log severity levels.
+ *
+ * These are the same as syslog, at least in glibc.
+ *
+ * \sa rs_trace_set_level()
+ */
+typedef enum {
+ RS_LOG_EMERG = 0, /**< System is unusable */
+ RS_LOG_ALERT = 1, /**< Action must be taken immediately */
+ RS_LOG_CRIT = 2, /**< Critical conditions */
+ RS_LOG_ERR = 3, /**< Error conditions */
+ RS_LOG_WARNING = 4, /**< Warning conditions */
+ RS_LOG_NOTICE = 5, /**< Normal but significant condition */
+ RS_LOG_INFO = 6, /**< Informational */
+ RS_LOG_DEBUG = 7 /**< Debug-level messages */
+} rs_loglevel;
+
+
+
+/**
+ * \typedef rs_trace_fn_t
+ * \brief Callback to write out log messages.
+ * \param level a syslog level.
+ * \param msg message to be logged.
+ */
+typedef void rs_trace_fn_t(int level, char const *msg);
+
+void rs_trace_set_level(rs_loglevel level);
+
+/** Set trace callback. */
+void rs_trace_to(rs_trace_fn_t *);
+
+/** Default trace callback that writes to stderr. Implements
+ * ::rs_trace_fn_t, and may be passed to rs_trace_to(). */
+void rs_trace_stderr(int level, char const *msg);
+
+/** Check whether the library was compiled with debugging trace
+ * suport. */
+int rs_supports_trace(void);
+
+
+
+/**
+ * Convert FROM_LEN bytes at FROM_BUF into a hex representation in
+ * TO_BUF, which must be twice as long plus one byte for the null
+ * terminator.
+ */
+void rs_hexify(char *to_buf, void const *from_buf, int from_len);
+
+/**
+ * Decode a base64 buffer in place. \return the number of binary
+ * bytes.
+ */
+size_t rs_unbase64(char *s);
+
+
+/**
+ * Encode a buffer as base64.
+ */
+void rs_base64(unsigned char const *buf, int n, char *out);
+
+
+/**
+ * \brief Return codes from nonblocking rsync operations.
+ */
+typedef enum {
+ RS_DONE = 0, /**< Completed successfully. */
+ RS_BLOCKED = 1, /**< Blocked waiting for more data. */
+ RS_RUNNING = 2, /**< Not yet finished or blocked.
+ * This value should never be returned
+ * to the caller. */
+
+ RS_TEST_SKIPPED = 77, /**< Test neither passed or failed. */
+
+ RS_IO_ERROR = 100, /**< Error in file or network IO. */
+ RS_SYNTAX_ERROR = 101, /**< Command line syntax error. */
+ RS_MEM_ERROR = 102, /**< Out of memory. */
+ RS_INPUT_ENDED = 103, /**< End of input file, possibly
+ unexpected. */
+ RS_BAD_MAGIC = 104, /**< Bad magic number at start of
+ stream. Probably not a librsync
+ file, or possibly the wrong kind of
+ file or from an incompatible
+ library version. */
+ RS_UNIMPLEMENTED = 105, /**< Author is lazy. */
+ RS_CORRUPT = 106, /**< Unbelievable value in stream. */
+ RS_INTERNAL_ERROR = 107, /**< Probably a library bug. */
+ RS_PARAM_ERROR = 108 /**< Bad value passed in to library,
+ * probably an application bug. */
+} rs_result;
+
+
+
+/**
+ * Return an English description of a ::rs_result value.
+ */
+char const *rs_strerror(rs_result r);
+
+
+/**
+ * \brief Performance statistics from a librsync encoding or decoding
+ * operation.
+ *
+ * \sa rs_format_stats(), rs_log_stats()
+ */
+typedef struct rs_stats {
+ char const *op; /**< Human-readable name of current
+ * operation. For example, "delta". */
+ int lit_cmds; /**< Number of literal commands. */
+ rs_long_t lit_bytes; /**< Number of literal bytes. */
+ rs_long_t lit_cmdbytes; /**< Number of bytes used in literal
+ * command headers. */
+
+ rs_long_t copy_cmds, copy_bytes, copy_cmdbytes;
+ rs_long_t sig_cmds, sig_bytes;
+ int false_matches;
+
+ rs_long_t sig_blocks; /**< Number of blocks described by the
+ signature. */
+
+ size_t block_len;
+
+ rs_long_t in_bytes; /**< Total bytes read from input. */
+ rs_long_t out_bytes; /**< Total bytes written to output. */
+} rs_stats_t;
+
+
+/** \typedef struct rs_mdfour rs_mdfour_t
+ *
+ * \brief MD4 message-digest accumulator.
+ *
+ * \sa rs_mdfour(), rs_mdfour_begin(), rs_mdfour_update(),
+ * rs_mdfour_result()
+ */
+typedef struct rs_mdfour {
+ int A, B, C, D;
+ int totalN;
+ int tail_len;
+ unsigned char tail[64];
+} rs_mdfour_t;
+
+#define RS_MD4_LENGTH 16
+
+typedef unsigned int rs_weak_sum_t;
+typedef unsigned char rs_strong_sum_t[RS_MD4_LENGTH];
+
+void rs_mdfour(unsigned char *out, void const *in, size_t);
+void rs_mdfour_begin(/* @out@ */ rs_mdfour_t * md);
+void rs_mdfour_update(rs_mdfour_t * md, void const *,
+ size_t n);
+void rs_mdfour_result(rs_mdfour_t * md, unsigned char *out);
+
+char *rs_format_stats(rs_stats_t const *, char *, size_t);
+
+int rs_log_stats(rs_stats_t const *stats);
+
+
+typedef struct rs_signature rs_signature_t;
+
+void rs_free_sumset(rs_signature_t *);
+void rs_sumset_dump(rs_signature_t const *);
+
+
+/**
+ * Stream through which the calling application feeds data to and from the
+ * library.
+ *
+ * On each call to rs_job_iter, the caller can make available
+ *
+ * - avail_in bytes of input data at next_in
+ * - avail_out bytes of output space at next_out
+ * - some of both
+ *
+ * Buffers must be allocated and passed in by the caller. This
+ * routine never allocates, reallocates or frees buffers.
+ *
+ * Pay attention to the meaning of the returned pointer and length
+ * values. They do \b not indicate the location and amount of
+ * returned data. Rather, if \p *out_ptr was originally set to \p
+ * out_buf, then the output data begins at \p out_buf, and has length
+ * \p *out_ptr - \p out_buf.
+ *
+ * Note also that if \p *avail_in is nonzero on return, then not all of
+ * the input data has been consumed. The caller should either provide
+ * more output buffer space and call rs_work() again passing the same
+ * \p next_in and \p avail_in, or put the remaining input data into some
+ * persistent buffer and call rs_work() with it again when there is
+ * more output space.
+ *
+ * \param next_in References a pointer which on entry should point to
+ * the start of the data to be encoded. Updated to point to the byte
+ * after the last one consumed.
+ *
+ * \param avail_in References the length of available input. Updated to
+ * be the number of unused data bytes, which will be zero if all the
+ * input was consumed. May be zero if there is no new input, but the
+ * caller just wants to drain output.
+ *
+ * \param next_out References a pointer which on entry points to the
+ * start of the output buffer. Updated to point to the byte after the
+ * last one filled.
+ *
+ * \param avail_out References the size of available output buffer.
+ * Updated to the size of unused output buffer.
+ *
+ * \return The ::rs_result that caused iteration to stop.
+ *
+ * \sa rs_buffers_t
+ * \sa \ref api_buffers
+ */
+struct rs_buffers_s {
+ char *next_in; /**< Next input byte */
+ size_t avail_in; /**< Number of bytes available at next_in */
+ int eof_in; /**< True if there is no more data
+ * after this. */
+
+ char *next_out; /**< Next output byte should be put there */
+ size_t avail_out; /**< Remaining free space at next_out */
+};
+
+/**
+ * Stream through which the calling application feeds data to and from the
+ * library.
+ *
+ * \sa struct rs_buffers_s
+ * \sa \ref api_buffers
+ */
+typedef struct rs_buffers_s rs_buffers_t;
+
+/** Default length of strong signatures, in bytes. The MD4 checksum
+ * is truncated to this size. */
+#define RS_DEFAULT_STRONG_LEN 8
+
+/** Default block length, if not determined by any other factors. */
+#define RS_DEFAULT_BLOCK_LEN 2048
+
+
+/** \typedef struct rs_job rs_job_t
+ *
+ * \brief Job of work to be done.
+ *
+ * Created by functions such as rs_sig_begin(), and then iterated
+ * over by rs_job_iter(). */
+typedef struct rs_job rs_job_t;
+
+/**
+ * Bitmask values that may be passed to the options parameter of
+ * rs_work().
+ */
+typedef enum rs_work_options {
+ RS_END = 0x01 /**< End of input file; please finish
+ * up. */
+} rs_work_options;
+
+
+rs_result rs_job_iter(rs_job_t *, rs_buffers_t *);
+
+typedef rs_result rs_driven_cb(rs_job_t *job, rs_buffers_t *buf,
+ void *opaque);
+
+rs_result rs_job_drive(rs_job_t *job, rs_buffers_t *buf,
+ rs_driven_cb in_cb, void *in_opaque,
+ rs_driven_cb out_cb, void *out_opaque);
+
+rs_result rs_job_free(rs_job_t *);
+
+int rs_accum_value(rs_job_t *, char *sum, size_t sum_len);
+
+rs_job_t *rs_sig_begin(size_t new_block_len, size_t strong_sum_len);
+
+rs_job_t *rs_delta_begin(rs_signature_t *);
+
+rs_job_t *rs_loadsig_begin(rs_signature_t **);
+
+/**
+ * \brief Callback used to retrieve parts of the basis file.
+ *
+ * \param pos Position where copying should begin.
+ *
+ * \param len On input, the amount of data that should be retrieved.
+ * Updated to show how much is actually available.
+ *
+ * \param buf On input, a buffer of at least \p *len bytes. May be
+ * updated to point to a buffer allocated by the callback if it
+ * prefers.
+ */
+typedef rs_result rs_copy_cb(void *opaque, off_t pos,
+ size_t *len, void **buf);
+
+
+
+rs_job_t *rs_patch_begin(rs_copy_cb *, void *copy_arg);
+
+
+rs_result rs_build_hash_table(rs_signature_t* sums);
+
+
+
+#ifndef RSYNC_NO_STDIO_INTERFACE
+/**
+ * Buffer sizes for file IO.
+ *
+ * You probably only need to change these in testing.
+ */
+extern int rs_inbuflen, rs_outbuflen;
+
+
+/**
+ * Calculate the MD4 sum of a file.
+ *
+ * \param result Binary (not hex) MD4 of the whole contents of the
+ * file.
+ */
+void rs_mdfour_file(FILE *in_file, char *result);
+
+rs_result rs_sig_file(FILE *old_file, FILE *sig_file,
+ size_t block_len, size_t strong_len, rs_stats_t *);
+
+rs_result rs_loadsig_file(FILE *, rs_signature_t **, rs_stats_t *);
+
+rs_result rs_file_copy_cb(void *arg, off_t pos, size_t *len, void **buf);
+
+rs_result rs_delta_file(rs_signature_t *, FILE *new_file, FILE *delta_file, rs_stats_t *);
+
+rs_result rs_patch_file(FILE *basis_file, FILE *delta_file, FILE *new_file, rs_stats_t *);
+#endif