我在 NSData 上写了一个简短的类别,它使用 libSnappy 进行压缩。它在压缩过程中就像一个魅力,但是解压缩代码导致SNAPPY_INVALID_INPUT
. 有趣的是,尽管操作码无效,但 snappy 仍然result
用未压缩的数据填充 my 的缓冲区。有人知道为什么 snappy 把这个扔给我吗?
- (NSData*)dataBySnappyUncompression {
NSMutableData *result = nil;
if (self.bytes != NULL) {
size_t uncompress_result = 0;
snappy_status opCode = snappy_uncompressed_length(self.bytes, self.length, &uncompress_result);
if (opCode == SNAPPY_OK) {
result = [NSMutableData dataWithLength:uncompress_result];
opCode = snappy_uncompress(self.bytes, self.length, [result mutableBytes], &uncompress_result);
if (opCode == SNAPPY_OK) {
[result setLength:uncompress_result];
return result;
}
}
}
LEPLog(@"Failed snappy de-compress: tried to de-compress %lu bytes", self.length);
NSAssert(nil, @"Failed Snappy de-compress");
result = nil;
return result;
}
我应该注意,正在压缩/解压缩的数据是NSKeyedArchiver
调用的结果。