/*= -*- c-basic-offset: 4; indent-tabs-mode: nil; -*- * * librsync -- the library for network deltas * Id: readsums.c,v 1.30 2001/03/18 10:52:25 mbp Exp * * Copyright (C) 1999, 2000, 2001 by Martin Pool * Copyright (C) 1999 by Andrew Tridgell * * 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. */ /* * readsums.c -- Load signatures from a file into an ::rs_signature_t. */ #include #include #include #include #include #include "rsync.h" #include "sumset.h" #include "job.h" #include "trace.h" #include "netint.h" #include "protocol.h" #include "util.h" #include "stream.h" static rs_result rs_loadsig_s_weak(rs_job_t *job); static rs_result rs_loadsig_s_strong(rs_job_t *job); /** * Add a just-read-in checksum pair to the signature block. */ static rs_result rs_loadsig_add_sum(rs_job_t *job, rs_strong_sum_t *strong) { size_t new_size; rs_signature_t *sig = job->signature; rs_block_sig_t *asignature; sig->count++; new_size = sig->count * sizeof(rs_block_sig_t); sig->block_sigs = realloc(sig->block_sigs, new_size); if (sig->block_sigs == NULL) { return RS_MEM_ERROR; } asignature = &(sig->block_sigs[sig->count - 1]); asignature->weak_sum = job->weak_sig; asignature->i = sig->count; memcpy(asignature->strong_sum, strong, sig->strong_sum_len); if (rs_trace_enabled()) { char hexbuf[RS_MD4_LENGTH * 2 + 2]; rs_hexify(hexbuf, strong, sig->strong_sum_len); rs_trace("read in checksum: weak=%#x, strong=%s", asignature->weak_sum, hexbuf); } job->stats.sig_blocks++; return RS_RUNNING; } static rs_result rs_loadsig_s_weak(rs_job_t *job) { int l; rs_result result; result = rs_suck_n4(job, &l); if (result == RS_DONE) ; else if (result == RS_INPUT_ENDED) /* ending here is OK */ return RS_DONE; else return result; job->weak_sig = l; job->statefn = rs_loadsig_s_strong; return RS_RUNNING; } static rs_result rs_loadsig_s_strong(rs_job_t *job) { rs_result result; rs_strong_sum_t *strongsum; result = rs_scoop_read(job, job->signature->strong_sum_len, (void **) &strongsum); if (result != RS_DONE) return result; job->statefn = rs_loadsig_s_weak; return rs_loadsig_add_sum(job, strongsum); } static rs_result rs_loadsig_s_stronglen(rs_job_t *job) { int l; rs_result result; if ((result = rs_suck_n4(job, &l)) != RS_DONE) return result; job->strong_sum_len = l; if (l < 0 || l > RS_MD4_LENGTH) { rs_error("strong sum length %d is implausible", l); return RS_CORRUPT; } job->signature->block_len = job->block_len; job->signature->strong_sum_len = job->strong_sum_len; rs_trace("allocated sigset_t (strong_sum_len=%d, block_len=%d)", (int) job->strong_sum_len, (int) job->block_len); job->statefn = rs_loadsig_s_weak; return RS_RUNNING; } static rs_result rs_loadsig_s_blocklen(rs_job_t *job) { int l; rs_result result; if ((result = rs_suck_n4(job, &l)) != RS_DONE) return result; job->block_len = l; if (job->block_len < 1) { rs_error("block length of %d is bogus", (int) job->block_len); return RS_CORRUPT; } job->statefn = rs_loadsig_s_stronglen; job->stats.block_len = job->block_len; return RS_RUNNING; } static rs_result rs_loadsig_s_magic(rs_job_t *job) { int l; rs_result result; if ((result = rs_suck_n4(job, &l)) != RS_DONE) { return result; } else if (l != RS_SIG_MAGIC) { rs_error("wrong magic number %#10x for signature", l); return RS_BAD_MAGIC; } else { rs_trace("got signature magic %#10x", l); } job->statefn = rs_loadsig_s_blocklen; return RS_RUNNING; } /** * \brief Read a signature from a file into an ::rs_signature_t structure * in memory. * * Once there, it can be used to generate a delta to a newer version of * the file. * * \note After loading the signatures, you must call * rs_build_hash_table() before you can use them. */ rs_job_t *rs_loadsig_begin(rs_signature_t **signature) { rs_job_t *job; job = rs_job_new("loadsig", rs_loadsig_s_magic); *signature = job->signature = rs_alloc_struct(rs_signature_t); job->signature->count = 0; return job; }