C zlib压缩和解压缩用法
我正在尝试使用C zlib压缩和解压缩用法,c,zlib,compression,C,Zlib,Compression,我正在尝试使用compress()和uncompress()函数用zlib压缩和解压随机生成的字符串的最简单方法。但是在执行uncompress()函数之后,我得到了一个Z_DATA_错误(-3)。有人知道我的错误在哪里吗 代码如下: int main(int argc __attribute ((unused)),char **argv __attribute ((unused))) { unsigned char* cara_in; unsigned char* cara_i
compress()
和uncompress()
函数用zlib压缩和解压随机生成的字符串的最简单方法。但是在执行uncompress()
函数之后,我得到了一个Z_DATA_错误(-3)
。有人知道我的错误在哪里吗
代码如下:
int
main(int argc __attribute ((unused)),char **argv __attribute ((unused)))
{
unsigned char* cara_in;
unsigned char* cara_inter;
unsigned char* cara_out;
size_t i;
size_t len = 1024*50; //50 KBytes
int ret;
cara_in = (unsigned char*)malloc(sizeof(unsigned char*)*len);
cara_inter = (unsigned char*)malloc(sizeof(unsigned char*)*len);
cara_out = (unsigned char*)malloc(sizeof(unsigned char*)*len);
uLongf size_cara_inter;
uLongf size_cara_out;
srand(time (NULL));
/* Generating */
for(i=0; i < len-1;i++)
{
cara_in[i] = (int)(rand() %24 +65);
}
size_cara_inter = 2*len;
ret = compress(
cara_inter,
&size_cara_inter,
cara_in,
(uLongf)strlen((const char*)cara_in)
);
if(ret != Z_OK)
{
/* error */
return EXIT_FAILURE;
}
size_cara_out = 2*len;
ret = uncompress(
cara_out,
&size_cara_out,
cara_inter,
(uLongf)strlen((const char*)cara_inter)
);
if(ret != Z_OK)
{
/* error */
return EXIT_FAILURE;
}
/* compare */
ret = strcmp((const char*)cara_in, (const char*)cara_out);
if(ret != 0){
/*problem*/
fprintf(stderr, "\nOuups! :(\nResult of cmp is %d", ret);
fflush(stderr);
fprintf(
stderr,
"\ncara_in length : %d, cara_out length : %d\n",
(unsigned)strlen((const char*)cara_in), (unsigned)strlen((const char*)cara_out)
);
fflush(stderr);
}
return EXIT_SUCCESS;
}
int
main(int-argc\uu属性((未使用)),char**argv\uu属性((未使用)))
{
未签名字符*cara_in;
未签名字符*cara_inter;
未签名字符*cara_out;
尺寸i;
大小\u t len=1024*50;//50千字节
int ret;
cara_in=(无符号字符*)malloc(sizeof(无符号字符*)*len);
cara_inter=(无符号字符*)malloc(sizeof(无符号字符*)*len);
cara_out=(无符号字符*)malloc(sizeof(无符号字符*)*len);
uLongf size_cara_inter;
uLongf尺寸为0.5克拉;
srand(时间(空));
/*产生*/
对于(i=0;i
多亏了Francis,下面是正确的源代码:
int
main(int argc __attribute ((unused)),char **argv __attribute ((unused)))
{
unsigned char* cara_in;
unsigned char* cara_inter;
unsigned char* cara_out;
size_t i;
size_t len = 1024*50; //50 KBytes
int ret;
cara_in = (unsigned char*)malloc(sizeof(unsigned char*)*len);
cara_inter = (unsigned char*)malloc(sizeof(unsigned char*)*len);
cara_out = (unsigned char*)malloc(sizeof(unsigned char*)*len);
uLongf size_cara_inter;
uLongf size_cara_out;
srand(time (NULL));
/* Generating */
for(i=0; i < len-1;i++)
{
cara_in[i] = (int)(rand() %24 +65);
}
cara_in[len] = '\0';
size_cara_inter = 2*len;
ret = compress(
cara_inter,
&size_cara_inter,
cara_in,
(uLongf)strlen((const char*)cara_in)
);
if(ret != Z_OK)
{
/* error */
return EXIT_FAILURE;
}
size_cara_out = 2*len;
ret = uncompress(
cara_out,
&size_cara_out,
cara_inter,
size_cara_inter
);
if(ret != Z_OK)
{
/* error */
return EXIT_FAILURE;
}
/* compare */
ret = strcmp((const char*)cara_in, (const char*)cara_out);
if(ret != 0){
/*problem*/
fprintf(stderr, "\nOuups! :(\nResult of cmp is %d", ret);
fflush(stderr);
fprintf(
stderr,
"\ncara_in length : %d, cara_out length : %d\n",
(unsigned)strlen((const char*)cara_in), (unsigned)strlen((const char*)cara_out)
);
fflush(stderr);
}
return EXIT_SUCCESS;
}
int
main(int-argc\uu属性((未使用)),char**argv\uu属性((未使用)))
{
未签名字符*cara_in;
未签名字符*cara_inter;
未签名字符*cara_out;
尺寸i;
大小\u t len=1024*50;//50千字节
int ret;
cara_in=(无符号字符*)malloc(sizeof(无符号字符*)*len);
cara_inter=(无符号字符*)malloc(sizeof(无符号字符*)*len);
cara_out=(无符号字符*)malloc(sizeof(无符号字符*)*len);
uLongf size_cara_inter;
uLongf尺寸为0.5克拉;
srand(时间(空));
/*产生*/
对于(i=0;i
多亏了Francis,下面是正确的源代码:
int
main(int argc __attribute ((unused)),char **argv __attribute ((unused)))
{
unsigned char* cara_in;
unsigned char* cara_inter;
unsigned char* cara_out;
size_t i;
size_t len = 1024*50; //50 KBytes
int ret;
cara_in = (unsigned char*)malloc(sizeof(unsigned char*)*len);
cara_inter = (unsigned char*)malloc(sizeof(unsigned char*)*len);
cara_out = (unsigned char*)malloc(sizeof(unsigned char*)*len);
uLongf size_cara_inter;
uLongf size_cara_out;
srand(time (NULL));
/* Generating */
for(i=0; i < len-1;i++)
{
cara_in[i] = (int)(rand() %24 +65);
}
cara_in[len] = '\0';
size_cara_inter = 2*len;
ret = compress(
cara_inter,
&size_cara_inter,
cara_in,
(uLongf)strlen((const char*)cara_in)
);
if(ret != Z_OK)
{
/* error */
return EXIT_FAILURE;
}
size_cara_out = 2*len;
ret = uncompress(
cara_out,
&size_cara_out,
cara_inter,
size_cara_inter
);
if(ret != Z_OK)
{
/* error */
return EXIT_FAILURE;
}
/* compare */
ret = strcmp((const char*)cara_in, (const char*)cara_out);
if(ret != 0){
/*problem*/
fprintf(stderr, "\nOuups! :(\nResult of cmp is %d", ret);
fflush(stderr);
fprintf(
stderr,
"\ncara_in length : %d, cara_out length : %d\n",
(unsigned)strlen((const char*)cara_in), (unsigned)strlen((const char*)cara_out)
);
fflush(stderr);
}
return EXIT_SUCCESS;
}
int
main(int-argc\uu属性((未使用)),char**argv\uu属性((未使用)))
{
未签名字符*cara_in;
未签名字符*cara_inter;
未签名字符*cara_out;
尺寸i;
大小\u t len=1024*50;//50千字节
int ret;
cara_in=(无符号字符*)malloc(sizeof(无符号字符*)*len);
cara_inter=(无符号字符*)malloc(sizeof(无符号字符*)*len);
cara_out=(无符号字符*)malloc(sizeof(无符号字符*)*len);
uLongf size_cara_inter;
uLongf尺寸为0.5克拉;
srand(时间(空));
/*产生*/
对于(i=0;i
编译器是否不知何故没有告诉您compress()和decompress()中的参数类型不匹配
calls?在这种情况下,将警告级别调高。如果它告诉您,那么您不认为编译警告可能与运行时故障有关吗?是的,我已经更正了警告,但仍然存在