diff options
Diffstat (limited to 'src/backup.c')
| -rw-r--r-- | src/backup.c | 156 |
1 files changed, 0 insertions, 156 deletions
diff --git a/src/backup.c b/src/backup.c deleted file mode 100644 index 0b558b6..0000000 --- a/src/backup.c +++ /dev/null @@ -1,156 +0,0 @@ -/* Copyright 2021 Ján Sučan <jan@jansucan.com> - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are - * met: - * - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -#include "backup.h" - -#include "file.h" -#include "print.h" - -#include <errno.h> -#include <inttypes.h> -#include <stdlib.h> -#include <string.h> - -static int check_files(const options_backup_t *const opts, - const resources_backup_t *const res); -static int write_out_buffer(const char *const buffer, size_t size, - FILE *const file); - -static int -check_files(const options_backup_t *const opts, - const resources_backup_t *const res) -{ - bool in_size_ok = false; - const size_t in_size = file_size(res->in_file, &in_size_ok); - - if (!in_size_ok) { - print_error("cannot get size of input file: %s", strerror(errno)); - return 1; - } - - bool ref_size_ok = false; - const size_t ref_size = file_size(res->ref_file, &ref_size_ok); - - if (!ref_size_ok) { - print_error("cannot get size of reference file: %s", strerror(errno)); - return 1; - } - - /* Check sizes of the input file and the reference file */ - if (in_size != ref_size) { - print_error("input file and reference file differ in size"); - return 1; - } else if ((in_size % opts->sector_size) != 0) { - print_error( - "size of input file and reference file is not multiple of %" PRIu32, - opts->sector_size); - return 1; - } - - return 0; -} - -static int -write_out_buffer(const char *const buffer, size_t size, FILE *const file) -{ - const size_t bytes_written = fwrite(buffer, 1U, size, file); - - if (bytes_written != size) { - print_error("cannot write to output file: %s", strerror(errno)); - return 1; - } - - return 0; -} - -int -backup(const options_backup_t *const opts, const resources_backup_t *const res) -{ - if (check_files(opts, res) != 0) { - return 1; - } - - size_t out_buffer_index = 0; - uint64_t input_file_offset = 0; - - for (;;) { - /* Read the sectors from the input and reference files into the buffers - */ - const size_t in_sectors_read = file_read_sectors( - res->in_file, res->in_buffer, opts->buffer_size, opts->sector_size); - const size_t ref_sectors_read = - file_read_sectors(res->ref_file, res->ref_buffer, opts->buffer_size, - opts->sector_size); - - if ((in_sectors_read == 0) || (ref_sectors_read == 0)) { - break; - } else if (in_sectors_read != ref_sectors_read) { - print_error( - "cannot read equal amount of sectors from the input files"); - return 1; - } - - /* Process the sectors in the buffers */ - for (size_t sector = 0; sector < in_sectors_read; ++sector) { - const size_t buffer_offset = sector * opts->sector_size; - - if (memcmp(res->in_buffer + buffer_offset, - res->ref_buffer + buffer_offset, - opts->sector_size) != 0) { - /* Backup the changed sector */ - if (out_buffer_index >= res->out_buffer_size) { - /* The output buffer is full. Write it to the output file */ - if (write_out_buffer(res->out_buffer, out_buffer_index, - res->out_file) != 0) { - return 1; - } - out_buffer_index = 0; - } - /* Write the next backup record */ - const uint64_t o = htole64(input_file_offset); - memcpy(res->out_buffer + out_buffer_index, (void *)&o, - sizeof(o)); - out_buffer_index += sizeof(o); - - memcpy(res->out_buffer + out_buffer_index, - res->in_buffer + buffer_offset, opts->sector_size); - out_buffer_index += opts->sector_size; - } - - input_file_offset += opts->sector_size; - } - } - - /* Write out the output buffer */ - if (out_buffer_index > 0) { - if (write_out_buffer(res->out_buffer, out_buffer_index, - res->out_file) != 0) { - return 1; - } - } - - return 0; -} |