使用c++解压超过2mb的gzip字节字符串,只解压了部分结果
时间: 2023-12-05 09:03:49 浏览: 218
zip文件解压(C++)
解压超过2MB的gzip字节字符串,需要使用较大的缓冲区来存储解压后的数据。以下是一个使用zlib库解压gzip字节字符串的示例代码:
```c++
#include <zlib.h>
#define CHUNK_SIZE 16384
int ungzip(char *src, int srcLen, char *dst, int dstLen)
{
int ret;
z_stream strm;
unsigned char in[CHUNK_SIZE];
unsigned char out[CHUNK_SIZE];
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
strm.avail_in = 0;
strm.next_in = Z_NULL;
ret = inflateInit2(&strm, MAX_WBITS + 16);
if (ret != Z_OK) {
return -1;
}
strm.avail_in = srcLen;
strm.next_in = (unsigned char *)src;
do {
strm.avail_out = CHUNK_SIZE;
strm.next_out = out;
ret = inflate(&strm, Z_NO_FLUSH);
switch (ret) {
case Z_NEED_DICT:
case Z_DATA_ERROR:
case Z_MEM_ERROR:
inflateEnd(&strm);
return -1;
}
int have = CHUNK_SIZE - strm.avail_out;
if (have > dstLen) {
inflateEnd(&strm);
return -1;
}
memcpy(dst, out, have);
dst += have;
dstLen -= have;
} while (strm.avail_out == 0);
inflateEnd(&strm);
return dstLen;
}
```
在调用该函数时,将待解压的gzip字节字符串传入src和srcLen参数,解压后的数据将存储在dst缓冲区中。如果解压成功,则返回剩余dst缓冲区的可用空间大小,如果解压失败,则返回-1。您可以根据需要修改缓冲区大小(CHUNK_SIZE)。
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