105 lines
2.1 KiB
C
105 lines
2.1 KiB
C
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#include<stdio.h>
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#include<stdlib.h>
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#include<string.h>
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#include<ctype.h>
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#define LINE_SIZE 150
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#define MAX_RLEN 50
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char* read_line();
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char* runLengthCod(char* line);
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char* encode(char* src);
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char* decode(char* line);
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int main(){
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char* line = read_line();
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//char* compressedline = runLengthCod(line);
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char* compressedline = encode(line);
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char* decompressedline = decode(compressedline);
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printf("line = %s\n", line);
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printf("encoded line = %s\n", compressedline);
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printf("decoded line = %s\n", decompressedline);
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free(line); free(compressedline);
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free(decompressedline);
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return 1;
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}
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char* encode(char* src)
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{
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int rLen;
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char count[MAX_RLEN];
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int len = strlen(src);
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char* dest = (char*)malloc(sizeof(char) * (len * 2 + 1));
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int i, j = 0, k;
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char ch;
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for (i = 0; i < len; i++) {
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//dest[j++] = src[i];
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ch = src[i];
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rLen = 1;
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while (i + 1 < len && src[i] == src[i + 1]) {
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rLen++;
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i++;
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}
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sprintf(count, "%d", rLen);
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for (k = 0; *(count + k); k++, j++) {
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dest[j] = count[k];
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}
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dest[j++]=ch;
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}
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dest[j] = '\0';
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return dest;
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}
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char* decode(char* line){
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char* result = (char*)malloc(LINE_SIZE);
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memset(result,0,LINE_SIZE);
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int enlen = strlen(line);
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int count=0;
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int j=0;
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for(int i=0; i<enlen; i++){
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if(isdigit(line[i])){
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count = count*10 + line[i]-'0';
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}else{
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while(count > 0){
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result[j] = line[i];
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j++;
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count--;
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}
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}
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}
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return result;
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}
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char* read_line(){
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char* line=(char*)malloc(LINE_SIZE);
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memset(line,0,LINE_SIZE);
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char* r = fgets(line,LINE_SIZE,stdin);
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if(r==NULL||strlen(line)==1){
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free(line);
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return 0;
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}
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else if (strlen(line)==LINE_SIZE-1 && line[LINE_SIZE]!='\n')
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{
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printf("string is too long\n");
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}
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else{
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int len = strlen(line);
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line[len-1] = '\0';
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return line;
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}
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}
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