我正在处理一项处理压缩和解压缩的任务。更具体地说，游程编码的变体（9 位块）。我遇到的问题涉及“类型”位的符号。我能够获得所需的位，但是，在该位应该为 1 的情况下，我的 printf 返回 -1。这会让我相信我在移位时没有做正确的事情，但我不知道那可能是什么。
void bitShift(char * mostFreq, unsigned char * byteBuf, int byteCount) {
char type;
int typels = 0;
int typers = 7;
int i = 0;
for(i = 0; i < byteCount - 1; i++) {
type = byteBuf[i];
printf("type before = %d\t", (unsigned int)type);
type = type << typels;
type = type >> typers;
typels++;
printf("type after = %d\n", (unsigned int)type);
}/*End for i*/
for(i = 0; i < byteCount; i++)
byteBuf[i] = 0;
}/*End bitShift*/
void decompressFile(char * mostFreq) {
unsigned char byteBuf[9] = { 0 };
int num, byteCount, i;
num = 0; byteCount = 0; i = 0;
unsigned char buf;
while((num = read(0,&buf, 1)) > 0) {
byteBuf[byteCount] = buf;
byteCount++;
if(byteCount == 9) {/*Flush bytes if buffer is full*/
bitShift(mostFreq, byteBuf, byteCount);
for(i = 0; i < 9; i++) {
byteBuf[i] = 0;
}/*End for i*/
byteCount = 0;
}/*End if*/
}/*End while*/
if(num == 0) {/*If EOF*/
if(byteCount != 0) {/*Bits have not been flushed*/
bitShift(mostFreq, byteBuf, byteCount);
}/*End if*/
} else if(num < 0) {
perror("Read error");
exit(1);
}/*End else if*/
}/*End decompressFile*/