linux开发---28.【C】用libz库压缩与解压缩的测试

3560阅读　0评论2017-02-28　wangcong02345
分类：LINUX

1.测试压缩与解压缩的demo

2. 代码如下
test.cpp
  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4. #include <errno.h>
  5. #include <zlib.h>
  6. #define dbmsg(fmt, args ...) printf("%s:%s[%d]: "fmt"\n", __FILE__,__FUNCTION__, __LINE__,##args)

  8. /* Compress gzip data */
  9. int gzcompress(Bytef *data, uLong ndata,
  10.     Bytef *zdata, uLong *nzdata)
  11. {
  12.     z_stream c_stream;
  13.     int err = 0;

  15.     if(data && ndata > 0)
  16.     {
  17.         c_stream.zalloc = (alloc_func)0;
  18.         c_stream.zfree = (free_func)0;
  19.         c_stream.opaque = (voidpf)0;
  20.         if(deflateInit2(&c_stream, Z_DEFAULT_COMPRESSION, Z_DEFLATED,
  21.                     -MAX_WBITS, 8, Z_DEFAULT_STRATEGY) != Z_OK) return -1;
  22.         c_stream.next_in = data;
  23.         c_stream.avail_in = ndata;
  24.         c_stream.next_out = zdata;
  25.         c_stream.avail_out = *nzdata;
  26.         while (c_stream.avail_in != 0 && c_stream.total_out < *nzdata)
  27.         {
  28.             if(deflate(&c_stream, Z_NO_FLUSH) != Z_OK) return -1;
  29.         }
  30.         if(c_stream.avail_in != 0) return c_stream.avail_in;
  31.         for (;;) {
  32.             if((err = deflate(&c_stream, Z_FINISH)) == Z_STREAM_END) break;
  33.             if(err != Z_OK) return -1;
  34.         }
  35.         if(deflateEnd(&c_stream) != Z_OK) return -1;
  36.         *nzdata = c_stream.total_out;
  37.         return 0;
  38.     }
  39.     return -1;
  40. }

  42. /* Uncompress gzip data */
  43. int gzdecompress(Byte *zdata, uLong nzdata,
  44.         Byte *data, uLong *ndata)
  45. {
  46.     int err = 0;
  47.     z_stream d_stream = {0}; /* decompression stream */
  48.     static char dummy_head[2] =
  49.     {
  50.         0x8 + 0x7 * 0x10,
  51.         (((0x8 + 0x7 * 0x10) * 0x100 + 30) / 31 * 31) & 0xFF,
  52.     };
  53.     d_stream.zalloc = (alloc_func)0;
  54.     d_stream.zfree = (free_func)0;
  55.     d_stream.opaque = (voidpf)0;
  56.     d_stream.next_in = zdata;
  57.     d_stream.avail_in = 0;
  58.     d_stream.next_out = data;
  59.     if(inflateInit2(&d_stream, -MAX_WBITS) != Z_OK) return -1;
  60.     //if(inflateInit2(&d_stream, 47) != Z_OK) return -1;
  61.     while (d_stream.total_out < *ndata && d_stream.total_in < nzdata) {
  62.         d_stream.avail_in = d_stream.avail_out = 1; /* force small buffers */
  63.         if((err = inflate(&d_stream, Z_NO_FLUSH)) == Z_STREAM_END) break;
  64.         if(err != Z_OK )
  65.         {
  66.             if(err == Z_DATA_ERROR)
  67.             {
  68.                 d_stream.next_in = (Bytef*) dummy_head;
  69.                 d_stream.avail_in = sizeof(dummy_head);
  70.                 if((err = inflate(&d_stream, Z_NO_FLUSH)) != Z_OK)
  71.                 {
  72.                     return -1;
  73.                 }
  74.             }
  75.             else return -1;
  76.         }
  77.     }
  78.     if(inflateEnd(&d_stream) != Z_OK) return -1;
  79.     *ndata = d_stream.total_out;
  80.     return 0;
  81. }

  83. int file_read(char** pData)
  84. {
  85.     char *pchBuf = NULL;
  86.     int nLen = 0;
  87.     FILE *pF = fopen("siminfo_ok.xml", "r"); //打开文件
  88.     if(NULL== pF)
  89.     {
  90.         dbmsg("file open error=%s",strerror(errno));
  91.         return -2;
  92.     }

  94.     fseek(pF, 0, SEEK_END); //文件指针移到文件尾
  95.     nLen = ftell(pF); //得到当前指针位置, 即是文件的长度
  96.     rewind(pF); //文件指针恢复到文件头位置

  98.     //动态申请空间, 为保存字符串结尾标志\0, 多申请一个字符的空间
  99.     pchBuf = (char*) malloc(sizeof(char)*nLen+1);
  100.     if(!pchBuf)
  101.     {
  102.         perror("内存不够!\n");
  103.         exit(0);
  104.     }

  106.     //读取文件内容//读取的长度和源文件长度有可能有出入，这里自动调整 nLen
  107.     nLen = fread(pchBuf, sizeof(char), nLen, pF);

  109.     pchBuf[nLen] = '\0'; //添加字符串结尾标志

  111.     //printf("%s\n", pchBuf); //把读取的内容输出到屏幕看看

  113.     fclose(pF); //关闭文件
  114.     *pData = pchBuf;
  115. // free(pchBuf); //释放空间

  117.     return nLen;
  118. }

  120. #define BUF_SIZE 65535
  121. int main()
  122. {
  123.     //char *data = "kjdalkfjdflkjdlkfjdklfjdlkfjlkdjflkdjflddajfkdjfkdfaskf;ldsfk;ldakf;ldskfl;dskf;ld";    
  124.     //uLong ndata = strlen(data);    
  125.     char * data;
  126.     uLong ndata = file_read(&data);
  127.     Bytef zdata[BUF_SIZE];
  128.     uLong nzdata = BUF_SIZE;
  129.     Bytef odata[BUF_SIZE];
  130.     uLong nodata = BUF_SIZE;
  131.     
  132.     memset(zdata, 0, BUF_SIZE);
  133.     
  134.     if(gzcompress((Bytef *)data, ndata, zdata, &nzdata) == 0)
  135.     {
  136.         fprintf(stdout, "nzdata:%d %s\n", nzdata, zdata);
  137. #if 1
  138.     printf("orgin_len=%d, compressed_len=%d\n", ndata, nzdata);
  139.     for(int i=0; i<nzdata; i++)
  140.     {
  141.         //printf("%d=0x%x ", i,(unsigned char)base_info[i]);
  142.         printf("0x%x ", zdata[i]);
  143.         if((i+1)%10==0)
  144.             printf("\n");
  145.     }
  146.     printf("\n");
  147. #endif
  148.         memset(odata, 0, BUF_SIZE);
  149.         //if(gzdecompress(zdata, ndata, odata, &nodata) == 0) //ok
  150.         if(gzdecompress(zdata, ndata, odata, &nodata) == 0) //ok
  151.         {
  152.             //fprintf(stdout, "%d %s\n", nodata, odata);
  153.         }
  154.     }
  155. }




Makefile
  1. ####################################################
  2. # Generic makefile - 万能Makefile
  3. # for compiling and linking C++ projects on Linux
  4. # Author: George Foot Modified:Jackie Lee
  5. ####################################################
  6. ### Customising
  7. #
  8. # Adjust the following if necessary; EXECUTABLE is the target
  9. # executable's filename, and LIBS is a list of libraries to link in
  10. # (e.g. alleg, stdcx, iostr, etc). You can override these on make's
  11. # command line of course, if you prefer to do it that way.
  12. #
  13. #
  14. EXECUTABLE := test
  15. INCLUDES:=../../include ./
  16. SRCDIR:=
  17. #
  18. # # Now alter any implicit rules' variables if you like, e.g.:

  20. CC:=g++
  21. CFLAGS := -g -Wall -O3
  22. CPPFLAGS := $(CFLAGS)
  23. CPPFLAGS += $(addprefix -I,$(INCLUDES))
  24. CPPFLAGS += -MMD
  25. LDFLAGS = -Wl,-Bstatic -L../lib/ -lz -Wl,-Bdynamic -pthread -Wl,-Bdynamic
  26. #
  27. # # The next bit checks to see whether rm is in your djgpp bin
  28. # # directory; if not it uses del instead, but this can cause (harmless)
  29. # # `File not found' error messages. If you are not using DOS at all,
  30. # # set the variable to something which will unquestioningly remove
  31. # # files.
  32. #

  34. RM-F := rm -f


  37. # # You shouldn't need to change anything below this point.
  38. #
  39. SRCS := $(wildcard *.cpp) $(wildcard $(addsuffix /*.cpp, $(SRCDIR)))
  40. OBJS := $(patsubst %.cpp,%.o,$(SRCS))
  41. DEPS := $(patsubst %.o,%.d,$(OBJS))
  42. MISSING_DEPS := $(filter-out $(wildcard $(DEPS)),$(DEPS))
  43. MISSING_DEPS_SOURCES := $(wildcard $(patsubst %.d,%.cpp,$(MISSING_DEPS)))


  46. .PHONY : all deps objs clean veryclean rebuild info

  48. all: $(EXECUTABLE)

  50. deps : $(DEPS)

  52. objs : $(OBJS)

  54. clean :
  55.     @$(RM-F) *.o
  56.     @$(RM-F) *.d
  57.     @$(RM-F) $(EXECUTABLE)

  59. rebuild: veryclean all
  60. ifneq ($(MISSING_DEPS),)
  61. $(MISSING_DEPS) :
  62.     @$(RM-F) $(patsubst %.d,%.o,$@)
  63. endif
  64. -include $(DEPS)
  65. $(EXECUTABLE) : $(OBJS)
  66.     $(CC) -o $(EXECUTABLE) $(OBJS) $(LDFLAGS)

  68. info:
  69.     @echo $(SRCS)
  70.     @echo $(OBJS)
  71.     @echo $(DEPS)
  72.     @echo $(MISSING_DEPS)
  73.     @echo $(MISSING_DEPS_SOURCES)

3. 代码下载
gzip.rar(下载后改名为gzip.tar.gz)
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