Huffman Compression

app/CMakeLists.txt

@@ -0,0 +1,11 @@
+if(COMPILE_COMPRESSOR)
+    add_executable(${COMPRESSOR} "main-c.c")
+    target_link_libraries(${COMPRESSOR} PUBLIC ${CLIBRARY} ${HUFFMAN_LIBRARY})
+    target_include_directories(${COMPRESSOR} PUBLIC "../include")
+endif()
+
+if(COMPILE_EXTRACTOR)
+    add_executable(${EXTRACTOR} "main-e.c")
+    target_link_libraries(${EXTRACTOR} PUBLIC ${CLIBRARY} ${HUFFMAN_LIBRARY})
+    target_include_directories(${EXTRACTOR} PUBLIC "../include")
+endif()

app/main-c.c

@@ -0,0 +1,121 @@
+#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);
+}

app/main-e.c

@@ -0,0 +1,74 @@
+#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);
+}