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Huffman Compression

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Hizenberg
2024-04-15 16:58:02 +05:30
parent b55c5a4192
commit cfa0cc7462
11 changed files with 381 additions and 1 deletions
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5
clib/CMakeLists.txt Normal file
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@@ -0,0 +1,5 @@
add_library(${CLIBRARY} STATIC
"bitio.c"
"errhand.c")
target_include_directories(${CLIBRARY} PUBLIC "../include")

29
clib/bitio.h
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@@ -1,29 +0,0 @@
#ifndef _BITIO_H
#define _BITIO_H
#include <stdio.h>
typedef struct bit_file {
FILE* file;
unsigned char mask;
int rack;
int pacifier_counter;
} BIT_FILE;
BIT_FILE* OpenInputBitFile(char* name);
BIT_FILE* OpenOutputBitFile(char* name);
void OutputBit(BIT_FILE* bit_file, int bit);
void OutputBits(BIT_FILE* bit_file, unsigned long code, int count);
int InputBit(BIT_FILE* bit_file);
unsigned long InputBits(BIT_FILE* bit_file, int bit_count);
void CloseInputBitFile(BIT_FILE* bit_file);
void CloseOutputBitFile(BIT_FILE* bit_file);
void FilePrintBinary(FILE* file, unsigned int code, int bits);
#endif /* _BITIO_H */

6
clib/errhand.h
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@@ -1,6 +0,0 @@
#ifndef _ERRHAND_H
#define _ERRHAND_H
void fatal_error(char* fmt, ...);
#endif /* _ERRHAND_H */

121
clib/main-c.c
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@@ -1,121 +0,0 @@
#ifdef _MSC_VER
#define _CRT_SECURE_NO_WARNINGS
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "bitio.h"
#include "errhand.h"
#include "main.h"
void usage_exit(char* prog_name);
void print_ratios(char* input, char* output);
long file_size(char* name);
/* main function to compress file (any file) */
int main(int argc, char* argv[]) {
BIT_FILE* output;
FILE* input;
/* Function to set buffer for standard output (i.e. console)*/
/* setbuf(FILE*, char*) */
setbuf(stdout, NULL);
/* Here, it currently don't have any buffer to cache data. (bcoze of NULL) */
if (argc < 3)
usage_exit(argv[0]);
input = fopen(argv[1], "rb");
if (input == NULL)
fatal_error("Error opening %s for input\n", argv[1]);
output = OpenOutputBitFile(argv[2]);
if (output == NULL)
fatal_error("Error opening %s for output\n", argv[2]);
printf("\nCompressing %s to %s\n", argv[1], argv[2]);
printf("Using %s\n", CompressionName);
CompressFile(input, output, argc - 3, argv + 3);
CloseOutputBitFile(output);
fclose(input);
print_ratios(argv[1], argv[2]);
return 0;
}
/* main function to compress file (any file) */
void usage_exit(char* prog_name) {
char* short_name;
char* extension;
short_name = strrchr(prog_name, '\\');
if (short_name == NULL)
short_name = strrchr(prog_name, '/');
if (short_name == NULL)
short_name = strrchr(prog_name, ':');
if (short_name != NULL)
short_name++;
else
short_name = prog_name;
extension = strrchr(short_name, '.');
if (extension != NULL)
*extension = '\0';
printf("\nUsage: %s %s\n", short_name, Usage);
exit(EXIT_SUCCESS);
}
#ifndef SEEK_END
#define SEEK_END 2
#endif
long file_size(char* name) {
long eof_ftell;
FILE* file;
file = fopen(name, "r");
if (file == NULL)
return 0L;
fseek(file, 0L, SEEK_END);
eof_ftell = ftell(file);
fclose(file);
return eof_ftell;
}
void print_ratios(char* input, char* output) {
long input_size;
long output_size;
int ratio;
input_size = file_size(input);
if (input_size == 0)
input_size = 1;
output_size = file_size(output);
ratio = 100 - (int)(output_size * 100L / input_size);
printf("\nInput bytes: %ld\n", input_size);
printf("Output bytes: %ld\n", output_size);
if (output_size == 0)
output_size = 1;
printf("Compression ratio: %d\n", ratio);
}

74
clib/main-e.c
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@@ -1,74 +0,0 @@
#ifdef _MSC_VER
#define _CRT_SECURE_NO_WARNINGS
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "bitio.h"
#include "errhand.h"
#include "main.h"
void usage_exit(char* prog_name);
/*main function for expansion of file (any file) */
int main(int argc, char* argv[]) {
FILE* output;
BIT_FILE* input;
setbuf(stdout, NULL);
if (argc < 3)
usage_exit(argv[0]);
input = OpenInputBitFile(argv[1]);
if (input == NULL)
fatal_error("Error opening %s for input\n", argv[1]);
output = fopen(argv[2], "wb");
if (output == NULL)
fatal_error("Error opening %s for output\n", argv[2]);
printf("\nExpanding %s to %s\n", argv[1], argv[2]);
printf("Using %s\n", CompressionName);
argc -= 3;
argv += 3;
ExpandFile(input, output, argc, argv);
CloseInputBitFile(input);
fclose(output);
putc('\n', stdout);
return 0;
}
/* main function for expansion of file (any file) */
void usage_exit(char* prog_name) {
char* short_name;
char* extension;
short_name = strrchr(prog_name, '\\');
if (short_name == NULL)
short_name = strrchr(prog_name, '/');
if (short_name == NULL)
short_name = strrchr(prog_name, ':');
if (short_name != NULL)
short_name++;
else
short_name = prog_name;
extension = strrchr(short_name, '.');
if (extension != NULL)
*extension = '\0';
printf("\nUsage: %s %s\n", short_name, Usage);
exit(EXIT_SUCCESS);
}

11
clib/main.h
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@@ -1,11 +0,0 @@
#ifndef _MAIN_H
#define _MAIN_H
void CompressFile(FILE* input, BIT_FILE* output, int argc, char* argv[]);
void ExpandFile(BIT_FILE* input, FILE* output, int argc, char* argv[]);
extern char* Usage;
extern char* CompressionName;
#endif /* _MAIN_H */