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lz4/programs/lz4cli.c
Yann Collet c5decf7562 minor refactoring
2014-12-06 17:10:54 +01:00

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/*
LZ4cli - LZ4 Command Line Interface
Copyright (C) Yann Collet 2011-2014
GPL v2 License
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 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 General Public License 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
You can contact the author at :
- LZ4 source repository : http://code.google.com/p/lz4/
- LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c
*/
/*
Note : this is stand-alone program.
It is not part of LZ4 compression library, it is a user program of the LZ4 library.
The license of LZ4 library is BSD.
The license of xxHash library is BSD.
The license of this compression CLI program is GPLv2.
*/
//**************************************
// Tuning parameters
//**************************************
// ENABLE_LZ4C_LEGACY_OPTIONS :
// Control the availability of -c0, -c1 and -hc legacy arguments
// Default : Legacy options are disabled
// #define ENABLE_LZ4C_LEGACY_OPTIONS
//**************************************
// Compiler Options
//**************************************
// Disable some Visual warning messages
#ifdef _MSC_VER // Visual Studio
# define _CRT_SECURE_NO_WARNINGS
# define _CRT_SECURE_NO_DEPRECATE // VS2005
# pragma warning(disable : 4127) // disable: C4127: conditional expression is constant
#endif
#define _POSIX_SOURCE 1 // for fileno() within <stdio.h> on unix
//****************************
// Includes
//****************************
#include <stdio.h> // fprintf, fopen, fread, _fileno, stdin, stdout
#include <stdlib.h> // exit, calloc, free
#include <string.h> // strcmp, strlen
#include "bench.h" // BMK_benchFile, BMK_SetNbIterations, BMK_SetBlocksize, BMK_SetPause
#include "lz4io.h"
//****************************
// OS-specific Includes
//****************************
#if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(_WIN32) || defined(__CYGWIN__)
# include <fcntl.h> // _O_BINARY
# include <io.h> // _setmode, _isatty
# ifdef __MINGW32__
int _fileno(FILE *stream); // MINGW somehow forgets to include this windows declaration into <stdio.h>
# endif
# define SET_BINARY_MODE(file) _setmode(_fileno(file), _O_BINARY)
# define IS_CONSOLE(stdStream) _isatty(_fileno(stdStream))
#else
# include <unistd.h> // isatty
# define SET_BINARY_MODE(file)
# define IS_CONSOLE(stdStream) isatty(fileno(stdStream))
#endif
//****************************
// Constants
//****************************
#define COMPRESSOR_NAME "LZ4 command line interface"
#ifndef LZ4_VERSION
# define LZ4_VERSION "r125"
#endif
#define AUTHOR "Yann Collet"
#define WELCOME_MESSAGE "*** %s %i-bits %s, by %s (%s) ***\n", COMPRESSOR_NAME, (int)(sizeof(void*)*8), LZ4_VERSION, AUTHOR, __DATE__
#define LZ4_EXTENSION ".lz4"
#define LZ4_CAT "lz4cat"
#define KB *(1U<<10)
#define MB *(1U<<20)
#define GB *(1U<<30)
#define LZ4_BLOCKSIZEID_DEFAULT 7
//**************************************
// Macros
//**************************************
#define DISPLAY(...) fprintf(stderr, __VA_ARGS__)
#define DISPLAYLEVEL(l, ...) if (displayLevel>=l) { DISPLAY(__VA_ARGS__); }
static unsigned displayLevel = 2; // 0 : no display // 1: errors // 2 : + result + interaction + warnings ; // 3 : + progression; // 4 : + information
//**************************************
// Local Variables
//**************************************
static char* programName;
//**************************************
// Exceptions
//**************************************
#define DEBUG 0
#define DEBUGOUTPUT(...) if (DEBUG) DISPLAY(__VA_ARGS__);
#define EXM_THROW(error, ...) \
{ \
DEBUGOUTPUT("Error defined at %s, line %i : \n", __FILE__, __LINE__); \
DISPLAYLEVEL(1, "Error %i : ", error); \
DISPLAYLEVEL(1, __VA_ARGS__); \
DISPLAYLEVEL(1, "\n"); \
exit(error); \
}
//**************************************
// Version modifiers
//**************************************
#define EXTENDED_ARGUMENTS
#define EXTENDED_HELP
#define EXTENDED_FORMAT
#define DEFAULT_COMPRESSOR LZ4IO_compressFilename
#define DEFAULT_DECOMPRESSOR LZ4IO_decompressFilename
int LZ4IO_compressFilename_Legacy(char* input_filename, char* output_filename, int compressionlevel);
//****************************
// Functions
//****************************
int usage(void)
{
DISPLAY( "Usage :\n");
DISPLAY( " %s [arg] [input] [output]\n", programName);
DISPLAY( "\n");
DISPLAY( "input : a filename\n");
DISPLAY( " with no FILE, or when FILE is - or %s, read standard input\n", stdinmark);
DISPLAY( "Arguments :\n");
DISPLAY( " -1 : Fast compression (default) \n");
DISPLAY( " -9 : High compression \n");
DISPLAY( " -d : decompression (default for %s extension)\n", LZ4_EXTENSION);
DISPLAY( " -z : force compression\n");
DISPLAY( " -f : overwrite output without prompting \n");
DISPLAY( " -h/-H : display help/long help and exit\n");
return 0;
}
int usage_advanced(void)
{
DISPLAY(WELCOME_MESSAGE);
usage();
DISPLAY( "\n");
DISPLAY( "Advanced arguments :\n");
DISPLAY( " -V : display Version number and exit\n");
DISPLAY( " -v : verbose mode\n");
DISPLAY( " -q : suppress warnings; specify twice to suppress errors too\n");
DISPLAY( " -c : force write to standard output, even if it is the console\n");
DISPLAY( " -t : test compressed file integrity\n");
DISPLAY( " -l : compress using Legacy format (Linux kernel compression)\n");
DISPLAY( " -B# : Block size [4-7](default : 7)\n");
DISPLAY( " -BD : Block dependency (improve compression ratio)\n");
//DISPLAY( " -BX : enable block checksum (default:disabled)\n"); // Option currently inactive
DISPLAY( " -Sx : disable stream checksum (default:enabled)\n");
DISPLAY( "Benchmark arguments :\n");
DISPLAY( " -b : benchmark file(s)\n");
DISPLAY( " -i# : iteration loops [1-9](default : 3), benchmark mode only\n");
#if defined(ENABLE_LZ4C_LEGACY_OPTIONS)
DISPLAY( "Legacy arguments :\n");
DISPLAY( " -c0 : fast compression\n");
DISPLAY( " -c1 : high compression\n");
DISPLAY( " -hc : high compression\n");
DISPLAY( " -y : overwrite output without prompting \n");
DISPLAY( " -s : suppress warnings \n");
#endif // ENABLE_LZ4C_LEGACY_OPTIONS
EXTENDED_HELP;
return 0;
}
int usage_longhelp(void)
{
DISPLAY( "\n");
DISPLAY( "Which values can get [output] ? \n");
DISPLAY( "[output] : a filename\n");
DISPLAY( " '%s', or '-' for standard output (pipe mode)\n", stdoutmark);
DISPLAY( " '%s' to discard output (test mode)\n", NULL_OUTPUT);
DISPLAY( "[output] can be left empty. In this case, it receives the following value : \n");
DISPLAY( " - if stdout is not the console, then [output] = stdout \n");
DISPLAY( " - if stdout is console : \n");
DISPLAY( " + if compression selected, output to filename%s \n", LZ4_EXTENSION);
DISPLAY( " + if decompression selected, output to filename without '%s'\n", LZ4_EXTENSION);
DISPLAY( " > if input filename has no '%s' extension : error\n", LZ4_EXTENSION);
DISPLAY( "\n");
DISPLAY( "Compression levels : \n");
DISPLAY( "There are technically 2 accessible compression levels.\n");
DISPLAY( "-0 ... -2 => Fast compression\n");
DISPLAY( "-3 ... -9 => High compression\n");
DISPLAY( "\n");
DISPLAY( "stdin, stdout and the console : \n");
DISPLAY( "To protect the console from binary flooding (bad argument mistake)\n");
DISPLAY( "%s will refuse to read from console, or write to console \n", programName);
DISPLAY( "except if '-c' command is specified, to force output to console \n");
DISPLAY( "\n");
DISPLAY( "Simple example :\n");
DISPLAY( "1 : compress 'filename' fast, using default output name 'filename.lz4'\n");
DISPLAY( " %s filename\n", programName);
DISPLAY( "\n");
DISPLAY( "Arguments can be appended together, or provided independently. For example :\n");
DISPLAY( "2 : compress 'filename' in high compression mode, overwrite output if exists\n");
DISPLAY( " %s -f9 filename \n", programName);
DISPLAY( " is equivalent to :\n");
DISPLAY( " %s -f -9 filename \n", programName);
DISPLAY( "\n");
DISPLAY( "%s can be used in 'pure pipe mode', for example :\n", programName);
DISPLAY( "3 : compress data stream from 'generator', send result to 'consumer'\n");
DISPLAY( " generator | %s | consumer \n", programName);
#if defined(ENABLE_LZ4C_LEGACY_OPTIONS)
DISPLAY( "\n");
DISPLAY( "Warning :\n");
DISPLAY( "Legacy arguments take precedence. Therefore : \n");
DISPLAY( " %s -hc filename\n", programName);
DISPLAY( "means 'compress filename in high compression mode'\n");
DISPLAY( "It is not equivalent to :\n");
DISPLAY( " %s -h -c filename\n", programName);
DISPLAY( "which would display help text and exit\n");
#endif // ENABLE_LZ4C_LEGACY_OPTIONS
return 0;
}
int badusage(void)
{
DISPLAYLEVEL(1, "Incorrect parameters\n");
if (displayLevel >= 1) usage();
exit(1);
}
void waitEnter(void)
{
DISPLAY("Press enter to continue...\n");
getchar();
}
int main(int argc, char** argv)
{
int i,
cLevel=0,
decode=0,
bench=0,
filenamesStart=2,
legacy_format=0,
forceStdout=0,
forceCompress=0,
main_pause=0;
char* input_filename=0;
char* output_filename=0;
char* dynNameSpace=0;
char nullOutput[] = NULL_OUTPUT;
char extension[] = LZ4_EXTENSION;
int blockSize;
// Init
programName = argv[0];
LZ4IO_setOverwrite(0);
blockSize = LZ4IO_setBlockSizeID(LZ4_BLOCKSIZEID_DEFAULT);
// lz4cat behavior
if (!strcmp(programName, LZ4_CAT)) { decode=1; forceStdout=1; output_filename=stdoutmark; displayLevel=1; }
// command switches
for(i=1; i<argc; i++)
{
char* argument = argv[i];
if(!argument) continue; // Protection if argument empty
// Decode command (note : aggregated commands are allowed)
if (argument[0]=='-')
{
// '-' means stdin/stdout
if (argument[1]==0)
{
if (!input_filename) input_filename=stdinmark;
else output_filename=stdoutmark;
}
while (argument[1]!=0)
{
argument ++;
#if defined(ENABLE_LZ4C_LEGACY_OPTIONS)
// Legacy options (-c0, -c1, -hc, -y, -s)
if ((argument[0]=='c') && (argument[1]=='0')) { cLevel=0; argument++; continue; } // -c0 (fast compression)
if ((argument[0]=='c') && (argument[1]=='1')) { cLevel=9; argument++; continue; } // -c1 (high compression)
if ((argument[0]=='h') && (argument[1]=='c')) { cLevel=9; argument++; continue; } // -hc (high compression)
if (*argument=='y') { LZ4IO_setOverwrite(1); continue; } // -y (answer 'yes' to overwrite permission)
if (*argument=='s') { displayLevel=1; continue; } // -s (silent mode)
#endif // ENABLE_LZ4C_LEGACY_OPTIONS
if ((*argument>='0') && (*argument<='9'))
{
cLevel = 0;
while ((*argument >= '0') && (*argument <= '9'))
{
cLevel *= 10;
cLevel += *argument - '0';
argument++;
}
argument--;
continue;
}
switch(argument[0])
{
// Display help
case 'V': DISPLAY(WELCOME_MESSAGE); return 0; // Version
case 'h': usage_advanced(); return 0;
case 'H': usage_advanced(); usage_longhelp(); return 0;
// Compression (default)
case 'z': forceCompress = 1; break;
// Use Legacy format (for Linux kernel compression)
case 'l': legacy_format=1; break;
// Decoding
case 'd': decode=1; break;
// Force stdout, even if stdout==console
case 'c': forceStdout=1; output_filename=stdoutmark; displayLevel=1; break;
// Test
case 't': decode=1; LZ4IO_setOverwrite(1); output_filename=nulmark; break;
// Overwrite
case 'f': LZ4IO_setOverwrite(1); break;
// Verbose mode
case 'v': displayLevel=4; break;
// Quiet mode
case 'q': displayLevel--; break;
// keep source file (default anyway, so useless) (for xz/lzma compatibility)
case 'k': break;
// Modify Block Properties
case 'B':
while (argument[1]!=0)
{
int exitBlockProperties=0;
switch(argument[1])
{
case '4':
case '5':
case '6':
case '7':
{
int B = argument[1] - '0';
blockSize = LZ4IO_setBlockSizeID(B);
BMK_SetBlocksize(blockSize);
argument++;
break;
}
case 'D': LZ4IO_setBlockMode(LZ4IO_blockLinked); argument++; break;
case 'X': LZ4IO_setBlockChecksumMode(1); argument ++; break;
default : exitBlockProperties=1;
}
if (exitBlockProperties) break;
}
break;
// Modify Stream properties
case 'S': if (argument[1]=='x') { LZ4IO_setStreamChecksumMode(0); argument++; break; } else { badusage(); }
// Benchmark
case 'b': bench=1; break;
// Modify Nb Iterations (benchmark only)
case 'i':
if ((argument[1] >='1') && (argument[1] <='9'))
{
int iters = argument[1] - '0';
BMK_SetNbIterations(iters);
argument++;
}
break;
// Pause at the end (hidden option)
case 'p': main_pause=1; BMK_SetPause(); break;
EXTENDED_ARGUMENTS;
// Unrecognised command
default : badusage();
}
}
continue;
}
// first provided filename is input
if (!input_filename) { input_filename=argument; filenamesStart=i; continue; }
// second provided filename is output
if (!output_filename)
{
output_filename=argument;
if (!strcmp (output_filename, nullOutput)) output_filename = nulmark;
continue;
}
}
DISPLAYLEVEL(3, WELCOME_MESSAGE);
if (!decode) DISPLAYLEVEL(4, "Blocks size : %i KB\n", blockSize>>10);
// No input filename ==> use stdin
if(!input_filename) { input_filename=stdinmark; }
// Check if input or output are defined as console; trigger an error in this case
if (!strcmp(input_filename, stdinmark) && IS_CONSOLE(stdin) ) badusage();
// Check if benchmark is selected
if (bench) return BMK_benchFile(argv+filenamesStart, argc-filenamesStart, cLevel);
// No output filename ==> try to select one automatically (when possible)
while (!output_filename)
{
if (!IS_CONSOLE(stdout)) { output_filename=stdoutmark; break; } // Default to stdout whenever possible (i.e. not a console)
if ((!decode) && !(forceCompress)) // auto-determine compression or decompression, based on file extension
{
size_t l = strlen(input_filename);
if (!strcmp(input_filename+(l-4), LZ4_EXTENSION)) decode=1;
}
if (!decode) // compression to file
{
size_t l = strlen(input_filename);
dynNameSpace = (char*)calloc(1,l+5);
output_filename = dynNameSpace;
strcpy(output_filename, input_filename);
strcpy(output_filename+l, LZ4_EXTENSION);
DISPLAYLEVEL(2, "Compressed filename will be : %s \n", output_filename);
break;
}
// decompression to file (automatic name will work only if input filename has correct format extension)
{
size_t outl;
size_t inl = strlen(input_filename);
dynNameSpace = (char*)calloc(1,inl+1);
output_filename = dynNameSpace;
strcpy(output_filename, input_filename);
outl = inl;
if (inl>4)
while ((outl >= inl-4) && (input_filename[outl] == extension[outl-inl+4])) output_filename[outl--]=0;
if (outl != inl-5) { DISPLAYLEVEL(1, "Cannot determine an output filename\n"); badusage(); }
DISPLAYLEVEL(2, "Decoding file %s \n", output_filename);
}
}
// No warning message in pure pipe mode (stdin + stdout)
if (!strcmp(input_filename, stdinmark) && !strcmp(output_filename,stdoutmark) && (displayLevel==2)) displayLevel=1;
// Check if input or output are defined as console; trigger an error in this case
if (!strcmp(input_filename, stdinmark) && IS_CONSOLE(stdin) ) badusage();
if (!strcmp(output_filename,stdoutmark) && IS_CONSOLE(stdout) && !forceStdout) badusage();
// IO Stream/File
LZ4IO_setNotificationLevel(displayLevel);
if (decode) DEFAULT_DECOMPRESSOR(input_filename, output_filename);
else
// compression is default action
{
if (legacy_format)
{
DISPLAYLEVEL(3, "! Generating compressed LZ4 using Legacy format (deprecated) ! \n");
LZ4IO_compressFilename_Legacy(input_filename, output_filename, cLevel);
}
else
{
DEFAULT_COMPRESSOR(input_filename, output_filename, cLevel);
}
}
if (main_pause) waitEnter();
free(dynNameSpace);
return 0;
}
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