为什么 memcpy() 随机不复制正确的值

我是学计算机科学的大四学生，以前从未见过如此奇怪的行为.我肯定有一些C语言的复杂性我不理解，但我现在完全不知所措.

我实现了以下功能:

Declaration

void parse_resp(unsigned char *resp, unsigned char *chunk, unsigned int *opcode, unsigned char *opparams, unsigned int *nonce, unsigned char *treasure, int *offset); 

Basically just a function where I pass a punch of pointers to get populated

Definition

void parse_resp(unsigned char *resp, unsigned char *chunk, unsigned int *opcode, unsigned char *opparams, unsigned int *nonce, unsigned char *treasure, int *offset)
{
    int chunklen = resp[0];
    memcpy(&chunk[0], &resp[1], chunklen);
    memcpy(opcode, &resp[chunklen + 1], 1);
    memcpy(&opparams[0], &resp[chunklen + 2], 2);
    memcpy(nonce, &resp[chunklen + 4], 4);
    *nonce = htonl(*nonce);
}

Variable Initialization

unsigned char treasure[1024];
int offset = 0;
unsigned char chunk[127];
unsigned int opcode;
unsigned char opparams[2];
unsigned int nonce;

但这就是奇怪的地方.

Note:我知道这个错误有相当简单的解决方法，但我想先了解一下发生了什么.