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/*
Copyright (c) 2014, 2025, Oracle and/or its affiliates.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is designed to work with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have either included with
the program or referenced in the documentation.
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 General Public License, version 2.0, for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <zlib.h>
#include "client/client_priv.h"
#include "my_sys.h"
#include "print_version.h"
#include "welcome_copyright_notice.h"
static void usage() {
print_version();
puts(ORACLE_WELCOME_COPYRIGHT_NOTICE("2015"));
puts(
"Decompress data compressed by mysqlpump using zlib compression "
"algorithm by reading from input file and writing uncompressed "
"data to output file");
printf("Usage: %s input_file output_file\n", "zlib_decompress");
}
static const int INPUT_BUFFER_SIZE = 1024 * 1024;
static const int OUTPUT_BUFFER_SIZE = 1024 * 1024;
int main(int argc, char **argv) {
CLIENT_WARN_DEPRECATED_NO_REPLACEMENT("zlib_decompress");
MY_INIT(argv[0]);
if (argc != 3) {
usage();
exit(1);
}
FILE *input_file = fopen(argv[1], "rb");
FILE *output_file = fopen(argv[2], "wb");
if (input_file == nullptr) {
fprintf(stderr,
"zlib_decompress: [Error] Cannot open input file for reading.\n");
exit(1);
}
if (output_file == nullptr) {
fprintf(stderr, "zlib_decompress: [Error] Cannot create output file.\n");
exit(1);
}
z_stream decompression_context;
memset(&decompression_context, 0, sizeof(decompression_context));
inflateInit(&decompression_context);
char *input_buffer = new char[INPUT_BUFFER_SIZE];
char *output_buffer = new char[OUTPUT_BUFFER_SIZE];
bool is_eof = false;
while (!is_eof) {
int bytes_read = fread(input_buffer, 1, INPUT_BUFFER_SIZE, input_file);
if (bytes_read < INPUT_BUFFER_SIZE) {
is_eof = feof(input_file);
if (!is_eof) {
fprintf(stderr,
"zlib_decompress: [Error] Encountered problem during reading "
"input.\n");
exit(1);
}
}
decompression_context.avail_in = bytes_read;
decompression_context.next_in = (Bytef *)input_buffer;
do {
decompression_context.avail_out = OUTPUT_BUFFER_SIZE;
decompression_context.next_out = (Bytef *)output_buffer;
int res = inflate(&decompression_context, Z_NO_FLUSH);
if (res == Z_STREAM_ERROR) {
fprintf(stderr,
"zlib_decompress: [Error] Encountered problem during "
"decompression.\n");
exit(1);
}
size_t bytes_to_write =
OUTPUT_BUFFER_SIZE - decompression_context.avail_out;
if (fwrite(output_buffer, 1, bytes_to_write, output_file) !=
bytes_to_write) {
fprintf(stderr,
"zlib_decompress: [Error] Encountered problem during "
"file write.\n");
exit(1);
}
} while (decompression_context.avail_out == 0);
}
inflateEnd(&decompression_context);
delete[] input_buffer;
delete[] output_buffer;
fclose(input_file);
fclose(output_file);
my_end(0);
exit(0);
}
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