zlib和gzip生成不同的数据

2 回答

• 0

  我能够使用zlib 1.2.8和 inflateInit2 函数解码您提供的数据，其中windowBits为32 . 我根据zlib文档中的这些信息使用了32：

  windowBits也可以为零，以请求膨胀使用压缩流的zlib头中的窗口大小 .

  和

  向windowBits添加32以使用自动标头检测启用zlib和gzip解码

  这里's the full code. I stripped out error checking since I don'具有 zerr 函数 . 它没有使用Visual C，因此您需要删除 #pragma 以避免警告 .

  #include <iostream>
  #include <iomanip>
  #include <cstdint>
  #include <cctype>
  #include "zlib.h"
  
  #pragma comment(lib, "zdll.lib")
  
  const size_t block_size = 16;
  
  void printLine(unsigned char* data, size_t offset, size_t n)
  {
      if(n)
      {
          std::cout << std::setw(8) << std::setfill('0') << std::right << offset << " ";
          for(size_t x = 0; x < block_size; ++x)
          {
              if(x % (block_size/2) == 0) std::cout << " ";
              uint16_t d = x < n ? data[x] : 0;
              std::cout << std::hex << std::setw(2) << d << " ";
          }
          std::cout << "|";
          for(size_t x = 0; x < block_size; ++x)
          {
              int c = (x < n && isalnum(data[x])) ? data[x] : '.';
              std::cout << static_cast<char>(c);
          }
          std::cout << "|\n";
      }
  }
  
  void printHex(unsigned char* data, size_t n)
  {
      const size_t blocks = n / block_size;
      const size_t remainder = n % block_size;
      for(size_t i = 0; i < blocks; i++)
      {
          size_t offset = i * block_size;
          printLine(&data[offset], offset, block_size);
      }
      size_t offset = blocks * block_size;
      printLine(&data[offset], offset, remainder);
      std::cout << "\n";
  }
  
  int inflateZlib(unsigned char* data, uint32_t length, unsigned char* decompressed, uint32_t maxDecompressed)
  {
      z_stream infstream;
      infstream.zalloc = Z_NULL;
      infstream.zfree = Z_NULL;
      infstream.opaque = Z_NULL;
      infstream.avail_in = length;
      infstream.next_in = data;
      infstream.avail_out = maxDecompressed;
      infstream.next_out = decompressed;
      inflateInit2(&infstream, 32);
      inflate(&infstream, Z_FINISH);
      inflateEnd(&infstream);
      return infstream.total_out;
  }
  
  int main()
  {
      unsigned char dataChunk[] = 
          "\x1f\x8b\x08\x00\x00\x00\x00\x00\x78\x9c\xbd\x58\x4b\x88\x23\x45"
          "\x18\xee\x3c\x67\xe3\x24\x93\xcc\xae\x8a\xf8\x42\x10\xc4\xcb\x1a"
          "\x33\xa3\x7b\xf0\x60\xe6\xe0\xe6\xe0\x49\x90\xbd\x29\x4d\x4d\x77"
          "\x25\xdd\x99\xee\xea\xde\xaa\xee\x4c\x32\x82\x2c\xe8\xc1\x93\xac"
          "\x47\xc5\x45\xf\x82\x8\x5e\x16\xf\xba\x78\x18\x45\xd0\x83\x7\x95"
          "\x15\x5c\xd0\xc3\xaa\xb0\xb2\xee\x65\x5c\xf0\xe4\xc5\xbf\xaa\x1f"
          "\xa9\xea\x74\xcf\x64\x07\x31\xc3\x24\x9d\xfa\xfe\xbf\xea\xab\xff"
          "\x59\x15\xab\x62\x6a\xb5\x5d\x9b\x8c\x18\x2a\x5b\x15\x47\xd3\xb4"
          "\x92\x55\x35\xb5\xba\xb7\x3d\xc6\x46\xb0\xa3\x35\x03\x1c\x50\x64"
          "\x61\x93\x7a\xa4\x67\xd5\x00\xe1\xc2\xd8\xe4\x92\x75\xfe\x56\xb3"
          "\xca\xa6\x76\xc2\xf0\x1c\x8f";
      unsigned char decompressed[1000] = {};
  
      printHex(dataChunk, sizeof(dataChunk));
      uint32_t len = inflateZlib(dataChunk, sizeof(dataChunk), decompressed, sizeof(decompressed));
      printHex(decompressed, len);
      return 0;
  }
  

  回复于 2024-05-03T22:06:39+08:00
• 1

  我想你可能想要以不同的方式定义 decompressed ：

  unsigned char decompressed[1000];
  

  回复于 2024-05-03T22:06:39+08:00