zlib解压被压缩的PDF（关键字FlateDecode）

PDF被压缩了，但从网上看这个压缩算法就是zlib的压缩算法，下面的乱码就是压缩导致的乱码，现在需要把这些乱码复原

%PDF-1.7
%溷弦
4 0 obj
<</Length 3 0 R/Filter/FlateDecode>>
stream
x渆QMK聾}&跉MIb郦Q鰳娵R刍??焱zR<
?|3狣B6?颿f?滕,鞃?珈毵辊纡拶迨鷚#Ef? B?]蔑!?腊}?嫖?畴滁！鈠?v僣$貇憮b勴72?
溔%f."@4擫忶睵?舊?犼\銭/'S/鱐篖x!籤&鈾'Q:?肶O鷾p罷琑厹T?(?5-
瞪苑趬nf舣].O跧9n悪v驼寏w?W</僰?溏D_槠{耑`_佄D崣j旮c楣?[?蟒驱 躚7Q
endstream
endobj
3 0 obj
280
endobj

构建一个Win32的应用程序，zlib_test（我用的VS2010）
前面已经编译过zlib了，不知道怎么编译的zlib static lib的可以前面翻翻看看
添加zlib到工程中，就是添加一个静态库，把zlib.lib放到你的工程（*.vcxproj所在d)目录下
工程->属性->配置属性->链接器->输入->附加依赖项->添加 zlib.lib
工程->属性->配置属性->VC++目录->库目录添加$(ProjectDir)
工程->属性->配置属性->VC++目录->包含目录添加$(ProjectDir)\include
在工程目录下创建include，然后把zlib的.h文件都copy过来
不好意思，刚发现zlib中有例子不用创建工程了
直接用解压好的‘解决方案'中的testzlib，SourceFile中有testzlib.c,里面就是个压缩和解压的例子。
代码我贴下，别害怕，这是我在原来代码的基础上改的，真正用的代码很少，看后面

#include <stdio.h>
#include <stdlib.h>
#include <windows.h>#include "zlib.h"void MyDoMinus64(LARGE_INTEGER *R,LARGE_INTEGER A,LARGE_INTEGER B)
{R->HighPart = A.HighPart - B.HighPart;if (A.LowPart >= B.LowPart)R->LowPart = A.LowPart - B.LowPart;else{R->LowPart = A.LowPart - B.LowPart;R->HighPart --;}
}#ifdef _M_X64
// see http://msdn2.microsoft.com/library/twchhe95(en-us,vs.80).aspx for __rdtsc
unsigned __int64 __rdtsc(void);
void BeginCountRdtsc(LARGE_INTEGER * pbeginTime64)
{//   printf("rdtsc = %I64x\n",__rdtsc());pbeginTime64->QuadPart=__rdtsc();
}LARGE_INTEGER GetResRdtsc(LARGE_INTEGER beginTime64,BOOL fComputeTimeQueryPerf)
{LARGE_INTEGER LIres;unsigned _int64 res=__rdtsc()-((unsigned _int64)(beginTime64.QuadPart));LIres.QuadPart=res;// printf("rdtsc = %I64x\n",__rdtsc());return LIres;
}
#else
#ifdef _M_IX86
void myGetRDTSC32(LARGE_INTEGER * pbeginTime64)
{DWORD dwEdx,dwEax;_asm{rdtscmov dwEax,eaxmov dwEdx,edx}pbeginTime64->LowPart=dwEax;pbeginTime64->HighPart=dwEdx;
}void BeginCountRdtsc(LARGE_INTEGER * pbeginTime64)
{myGetRDTSC32(pbeginTime64);
}LARGE_INTEGER GetResRdtsc(LARGE_INTEGER beginTime64,BOOL fComputeTimeQueryPerf)
{LARGE_INTEGER LIres,endTime64;myGetRDTSC32(&endTime64);LIres.LowPart=LIres.HighPart=0;MyDoMinus64(&LIres,endTime64,beginTime64);return LIres;
}
#else
void myGetRDTSC32(LARGE_INTEGER * pbeginTime64)
{
}void BeginCountRdtsc(LARGE_INTEGER * pbeginTime64)
{
}LARGE_INTEGER GetResRdtsc(LARGE_INTEGER beginTime64,BOOL fComputeTimeQueryPerf)
{LARGE_INTEGER lr;lr.QuadPart=0;return lr;
}
#endif
#endifvoid BeginCountPerfCounter(LARGE_INTEGER * pbeginTime64,BOOL fComputeTimeQueryPerf)
{if ((!fComputeTimeQueryPerf) || (!QueryPerformanceCounter(pbeginTime64))){pbeginTime64->LowPart = GetTickCount();pbeginTime64->HighPart = 0;}
}DWORD GetMsecSincePerfCounter(LARGE_INTEGER beginTime64,BOOL fComputeTimeQueryPerf)
{LARGE_INTEGER endTime64,ticksPerSecond,ticks;DWORDLONG ticksShifted,tickSecShifted;DWORD dwLog=16+0;DWORD dwRet;if ((!fComputeTimeQueryPerf) || (!QueryPerformanceCounter(&endTime64)))dwRet = (GetTickCount() - beginTime64.LowPart)*1;else{MyDoMinus64(&ticks,endTime64,beginTime64);QueryPerformanceFrequency(&ticksPerSecond);{ticksShifted = Int64ShrlMod32(*(DWORDLONG*)&ticks,dwLog);tickSecShifted = Int64ShrlMod32(*(DWORDLONG*)&ticksPerSecond,dwLog);}dwRet = (DWORD)((((DWORD)ticksShifted)*1000)/(DWORD)(tickSecShifted));dwRet *=1;}return dwRet;
}int ReadFileMemory(const char* filename,long* plFileSize,unsigned char** pFilePtr)
{FILE* stream;unsigned char* ptr;int retVal=1;printf("filename = %s\n",filename);stream=fopen(filename, "rb");if (stream==NULL){printf("stream == NULL\n");return 0;}fseek(stream,0,SEEK_END);*plFileSize=ftell(stream);printf("*plFileSize = %d\n",*plFileSize);fseek(stream,0,SEEK_SET);ptr=malloc((*plFileSize)+1);if (ptr==NULL)retVal=0;else{if (fread(ptr, 1, *plFileSize,stream) != (*plFileSize))retVal=0;}fclose(stream);*pFilePtr=ptr;return retVal;
}
#if 1int main(int argc, char *argv[])
{const char *uncom_file_name = "uncom.txt";long lFileSize1 = 0;unsigned char * FilePtr = NULL;int err = 0;uLongf uncom_len = 1024;Bytef uncom_buf[1024];memset(uncom_buf,0x00,sizeof(uncom_buf));if(ReadFileMemory(uncom_file_name,&lFileSize1,&FilePtr)==0){printf("error reading %s\n",uncom_file_name);return 1;}else{printf("file %s read ,%d bytes\n",uncom_file_name,lFileSize1);}err = uncompress(uncom_buf,&uncom_len,FilePtr,lFileSize1);printf("uncom_len = %d\n",uncom_len);if (err != Z_OK){printf("err = %d\n",err);return 1;}if(FilePtr != NULL){free(FilePtr);FilePtr = NULL;}printf("uncom_buf = %s\n",uncom_buf);return 0;
}
#else
int main(int argc, char *argv[])
{int BlockSizeCompress=0x8000;int BlockSizeUncompress=0x8000;int cprLevel=Z_DEFAULT_COMPRESSION ;long lFileSize;unsigned char* FilePtr;long lBufferSizeCpr;long lBufferSizeUncpr;long lCompressedSize=0;unsigned char* CprPtr;unsigned char* UncprPtr;long lSizeCpr,lSizeUncpr;DWORD dwGetTick,dwMsecQP;LARGE_INTEGER li_qp,li_rdtsc,dwResRdtsc;if (argc<=1){printf("run TestZlib <File> [BlockSizeCompress] [BlockSizeUncompress] [compres. level]\n");return 0;}if (ReadFileMemory(argv[1],&lFileSize,&FilePtr)==0){printf("error reading %s\n",argv[1]);return 1;}else printf("file %s read, %u bytes\n",argv[1],lFileSize);if (argc>=3)BlockSizeCompress=atol(argv[2]);if (argc>=4)BlockSizeUncompress=atol(argv[3]);if (argc>=5)cprLevel=(int)atol(argv[4]);lBufferSizeCpr = lFileSize + (lFileSize/0x10) + 0x200;lBufferSizeUncpr = lBufferSizeCpr;CprPtr=(unsigned char*)malloc(lBufferSizeCpr + BlockSizeCompress);BeginCountPerfCounter(&li_qp,TRUE);dwGetTick=GetTickCount();BeginCountRdtsc(&li_rdtsc);{z_stream zcpr;int ret=Z_OK;long lOrigToDo = lFileSize;long lOrigDone = 0;int step=0;memset(&zcpr,0,sizeof(z_stream));deflateInit(&zcpr,cprLevel);zcpr.next_in = FilePtr;zcpr.next_out = CprPtr;do{long all_read_before = zcpr.total_in;zcpr.avail_in = min(lOrigToDo,BlockSizeCompress);zcpr.avail_out = BlockSizeCompress;ret=deflate(&zcpr,(zcpr.avail_in==lOrigToDo) ? Z_FINISH : Z_SYNC_FLUSH);lOrigDone += (zcpr.total_in-all_read_before);lOrigToDo -= (zcpr.total_in-all_read_before);step++;} while (ret==Z_OK);lSizeCpr=zcpr.total_out;deflateEnd(&zcpr);dwGetTick=GetTickCount()-dwGetTick;dwMsecQP=GetMsecSincePerfCounter(li_qp,TRUE);dwResRdtsc=GetResRdtsc(li_rdtsc,TRUE);printf("total compress size = %u, in %u step\n",lSizeCpr,step);printf("time = %u msec = %f sec\n",dwGetTick,dwGetTick/(double)1000.);printf("defcpr time QP = %u msec = %f sec\n",dwMsecQP,dwMsecQP/(double)1000.);printf("defcpr result rdtsc = %I64x\n\n",dwResRdtsc.QuadPart);}CprPtr=(unsigned char*)realloc(CprPtr,lSizeCpr);UncprPtr=(unsigned char*)malloc(lBufferSizeUncpr + BlockSizeUncompress);BeginCountPerfCounter(&li_qp,TRUE);dwGetTick=GetTickCount();BeginCountRdtsc(&li_rdtsc);{z_stream zcpr;int ret=Z_OK;long lOrigToDo = lSizeCpr;long lOrigDone = 0;int step=0;memset(&zcpr,0,sizeof(z_stream));inflateInit(&zcpr);zcpr.next_in = CprPtr;zcpr.next_out = UncprPtr;do{long all_read_before = zcpr.total_in;zcpr.avail_in = min(lOrigToDo,BlockSizeUncompress);zcpr.avail_out = BlockSizeUncompress;ret=inflate(&zcpr,Z_SYNC_FLUSH);lOrigDone += (zcpr.total_in-all_read_before);lOrigToDo -= (zcpr.total_in-all_read_before);step++;} while (ret==Z_OK);lSizeUncpr=zcpr.total_out;inflateEnd(&zcpr);dwGetTick=GetTickCount()-dwGetTick;dwMsecQP=GetMsecSincePerfCounter(li_qp,TRUE);dwResRdtsc=GetResRdtsc(li_rdtsc,TRUE);printf("total uncompress size = %u, in %u step\n",lSizeUncpr,step);printf("time = %u msec = %f sec\n",dwGetTick,dwGetTick/(double)1000.);printf("uncpr  time QP = %u msec = %f sec\n",dwMsecQP,dwMsecQP/(double)1000.);printf("uncpr  result rdtsc = %I64x\n\n",dwResRdtsc.QuadPart);}if (lSizeUncpr==lFileSize){if (memcmp(FilePtr,UncprPtr,lFileSize)==0)printf("compare ok\n");}return 0;
}
#endif

这是当前用的代码

#include <stdio.h>
#include <stdlib.h>
#include <windows.h>#include "zlib.h"
int ReadFileMemory(const char* filename,long* plFileSize,unsigned char** pFilePtr)
{FILE* stream;unsigned char* ptr;int retVal=1;stream=fopen(filename, "rb");if (stream==NULL){printf("stream == NULL\n");return 0;}fseek(stream,0,SEEK_END);*plFileSize=ftell(stream);fseek(stream,0,SEEK_SET);ptr=malloc((*plFileSize)+1);if (ptr==NULL)retVal=0;else{if (fread(ptr, 1, *plFileSize,stream) != (*plFileSize))retVal=0;}fclose(stream);*pFilePtr=ptr;return retVal;
}
/*
* 从uncom.txt中读取内容，然后解压缩
*/
int main(int argc, char *argv[])
{const char *uncom_file_name = "uncom.txt";long lFileSize1 = 0;unsigned char * FilePtr = NULL;int err = 0;uLongf uncom_len = 1024;Bytef uncom_buf[1024];memset(uncom_buf,0x00,sizeof(uncom_buf));if(ReadFileMemory(uncom_file_name,&lFileSize1,&FilePtr)==0){printf("error reading %s\n",uncom_file_name);return 1;}else{printf("file %s read ,%d bytes\n",uncom_file_name,lFileSize1);}err = uncompress(uncom_buf,&uncom_len,FilePtr,lFileSize1);printf("uncom_len = %d\n",uncom_len);if (err != Z_OK){printf("err = %d\n",err);return 1;}if(FilePtr != NULL){free(FilePtr);FilePtr = NULL;}printf("uncom_buf = %s\n",uncom_buf);return 0;
}

这里有几种错误，先说第一种 uncompress第二个参数 uncom_len 定义为0，这个参数要大于你解压后的数据，所以你先要估计这这个值的大小，这个定义为0的情况下会报错为 Z_DATA_ERROR
第二种错误，还是第二个参数定义的过小，比如我这里刚开始定义了大小是512，太TM巧了，我的解压缩的数据最后发现是513的大小。。。如果这里定义太小会报错为Z_BUF_ERROR，当然网上说这个变量定义的类型不对也会报这个错误，我没试过
第三种错误，出现运行时候崩溃，看下堆栈信息是报错在inflate_fast中，在汇编中，尝试了这位兄弟的方法zlib uncompress解压数据inflate_fast函数出错的解决办法，是可行的。要注意的是，对应的汇编的函数名字改的话要改全，改完之后还需要手动去删除contrib\masmx86 下的inffas32.lst 和inffas32.obj 点击解决方案，重新生成，
下面是我解压出来的数据

q
1 0 0 1 50 700 cm
BT
/F0 24 Tf
0 0 Td
[(   )20(     )]TJ
ET
Q
q
BT
/F0 24 Tf
0 TL
50 676 Td
(    \n    \r      \r                \r      )Tj
0 -24 Td
(                  \n   \r                 \n          )Tj
0 -24 Td
(       \r \n  \n                  \n        )Tj
0 -24 Td
[( \r               )20(           \n     \r   )]TJ
0 -24 Td
[( \r        \r  )20( \n    )20(        )]TJ
ET
Q

有问题欢迎留言

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