Update sk1/compressor.c

sk1/compressor.c

@@ -2,7 +2,7 @@
 #include <stdlib.h>
 #define WSIZE 250
 #define BSIZE 50
-
+///----------------------------LZ77-------------
 typedef struct {
     unsigned char pos;
     unsigned char n;
@@ -134,6 +134,110 @@ int decompress_1(const char* input_file, const char* output_file)
     fclose(input);
     fclose(output);
 
+
+    return compr_size;
+}//-------------------------------------RLE--------------------
+int compress_2(const char* input_file, const char* output_file) {
+    int ch, nchar;
+    unsigned char count = 1; 
+    int compr_size = 0; 
+
+    FILE* in = fopen(input_file, "rb");
+    FILE* out = fopen(output_file, "wb");
+
+    if (!in || !out) {
+        if (in) fclose(in);
+        if (out) fclose(out);
+        return -1; 
+    }
+
+    ch = fgetc(in);
+    while (ch != EOF) {
+        nchar = fgetc(in);
+
+        if (nchar == ch) {
+            
+            count++;
+            if (count == 127) {  
+                fputc(count, out);
+                fputc(ch, out);
+                compr_size += 2; 
+                count = 1;
+                ch = fgetc(in);
+            }
+        }
+        else {
+            if (count > 1) {                
+                fputc(count, out);
+                fputc(ch, out);
+                compr_size += 2; 
+            }
+            else {                
+                int rizn = 1;
+                char buffer[127]; 
+                buffer[0] = ch;
+
+                while (nchar != EOF && nchar != ch && rizn < 127) {
+                    buffer[rizn] = nchar;
+                    rizn++;
+                    ch = nchar;
+                    nchar = fgetc(in);
+                }
+                
+                fputc(0x80 | rizn, out);
+                compr_size += 1; 
+                for (int i = 0; i < rizn; i++) {
+                    fputc(buffer[i], out);
+                    compr_size += 1; 
+                }
+            }
+            count = 1;
+            ch = nchar;
+        }
+    }
+
+    fclose(in);
+    fclose(out);
+    return compr_size; 
+}
+
+int decompress_2(const char* input_file, const char* output_file) {
+    int byte;
+    int compr_size = 0; 
+
+    FILE* in = fopen(input_file, "rb");
+    FILE* out = fopen(output_file, "wb");
+
+    if (!in || !out) {
+        if (in) fclose(in);
+        if (out) fclose(out);
+        return -1; 
+    }
+
+    while ((byte = fgetc(in)) != EOF) {
+        if (byte & 0x80) {
+            
+            int count = byte & 0x7F;
+            for (int i = 0; i < count; i++) {
+                int ch = fgetc(in);
+                if (ch == EOF) break;
+                fputc(ch, out);
+                compr_size += 1; 
+            }
+        }
+        else {
+            
+            int count = byte;
+            int ch = fgetc(in);
+            for (int i = 0; i < count; i++) {
+                fputc(ch, out);
+                compr_size += 1; 
+            }
+        }
+    }
+
+    fclose(in);
+    fclose(out);
     return compr_size; 
 }