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file_for_patch.h
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file_for_patch.h
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//file_for_patch.h
// patch demo file tool
//
/*
This is the HDiffPatch copyright.
Copyright (c) 2012-2017 HouSisong All Rights Reserved.
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:
The above copyright notice and this permission notice shall be
included in all copies of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef HPatch_file_for_patch_h
#define HPatch_file_for_patch_h
#include <stdio.h>
#include <stdlib.h> // malloc free
#include "libHDiffPatch/HPatch/patch_types.h"
typedef unsigned char TByte;
#define kFileIOBestMaxSize (1024*1024)
typedef FILE* hpatch_FileHandle;
static hpatch_BOOL fileTell64(hpatch_FileHandle file,hpatch_StreamPos_t* out_pos){
#ifdef _MSC_VER
__int64 fpos=_ftelli64(file);
#else
off_t fpos=ftello(file);
#endif
hpatch_BOOL result=(fpos>=0);
if (result) *out_pos=fpos;
return result;
}
static hpatch_BOOL fileSeek64(hpatch_FileHandle file,hpatch_StreamPos_t seekPos,int whence){
#ifdef _MSC_VER
int ret=_fseeki64(file,seekPos,whence);
#else
off_t fpos=seekPos;
if ((fpos<0)||((hpatch_StreamPos_t)fpos!=seekPos)) return hpatch_FALSE;
int ret=fseeko(file,fpos,whence);
#endif
return (ret==0);
}
static hpatch_BOOL fileClose(hpatch_FileHandle* pfile){
hpatch_FileHandle file=*pfile;
if (file){
*pfile=0;
if (0!=fclose(file))
return hpatch_FALSE;
}
return hpatch_TRUE;
}
static hpatch_BOOL fileRead(hpatch_FileHandle file,TByte* buf,TByte* buf_end){
while (buf<buf_end) {
size_t readLen=(size_t)(buf_end-buf);
if (readLen>kFileIOBestMaxSize) readLen=kFileIOBestMaxSize;
if (readLen!=fread(buf,1,readLen,file)) return hpatch_FALSE;
buf+=readLen;
}
return buf==buf_end;
}
static hpatch_BOOL fileWrite(hpatch_FileHandle file,const TByte* data,const TByte* data_end){
while (data<data_end) {
size_t writeLen=(size_t)(data_end-data);
if (writeLen>kFileIOBestMaxSize) writeLen=kFileIOBestMaxSize;
if (writeLen!=fwrite(data,1,writeLen,file)) return hpatch_FALSE;
data+=writeLen;
}
return data==data_end;
}
#define _file_error(fileHandle){ \
if (fileHandle) fileClose(&fileHandle); \
return hpatch_FALSE; \
}
#if defined(_MSC_VER)&&(_MSC_VER>=1400) //VC2005
# define _fileOpenByMode(ppFile,fileName,mode) { \
errno_t err=fopen_s(ppFile,fileName,mode); \
if (err!=0) *(ppFile)=0; }
#else
# define _fileOpenByMode(ppFile,fileName,mode) { \
*(ppFile)=fopen(fileName,mode); }
#endif
hpatch_inline static
hpatch_BOOL fileOpenForRead(const char* fileName,hpatch_FileHandle* out_fileHandle,
hpatch_StreamPos_t* out_fileLength){
hpatch_FileHandle file=0;
assert(out_fileHandle!=0);
if (out_fileHandle==0) _file_error(file);
_fileOpenByMode(&file,fileName,"rb");
if (file==0) _file_error(file);
if (out_fileLength!=0){
hpatch_StreamPos_t file_length=0;
if (!fileSeek64(file,0,SEEK_END)) _file_error(file);
if (!fileTell64(file,&file_length)) _file_error(file);
if (!fileSeek64(file,0,SEEK_SET)) _file_error(file);
*out_fileLength=file_length;
}
*out_fileHandle=file;
return hpatch_TRUE;
}
hpatch_inline static
hpatch_BOOL fileOpenForCreateOrReWrite(const char* fileName,hpatch_FileHandle* out_fileHandle){
hpatch_FileHandle file=0;
assert(out_fileHandle!=0);
if (out_fileHandle==0) _file_error(file);
_fileOpenByMode(&file,fileName,"wb");
if (file==0) _file_error(file);
*out_fileHandle=file;
return hpatch_TRUE;
}
typedef struct TFileStreamInput{
hpatch_TStreamInput base;
hpatch_FileHandle m_file;
hpatch_StreamPos_t m_fpos;
size_t m_offset;
hpatch_BOOL fileError;
} TFileStreamInput;
hpatch_inline
static void TFileStreamInput_init(TFileStreamInput* self){
memset(self,0,sizeof(TFileStreamInput));
}
#define _fileError_return { self->fileError=hpatch_TRUE; return hpatch_FALSE; }
static hpatch_BOOL _read_file(const hpatch_TStreamInput* stream,hpatch_StreamPos_t readFromPos,
TByte* out_data,TByte* out_data_end){
size_t readLen;
TFileStreamInput* self=(TFileStreamInput*)stream->streamImport;
assert(out_data<=out_data_end);
readLen=(size_t)(out_data_end-out_data);
if (readLen==0) return hpatch_TRUE;
if ((readLen>self->base.streamSize)
||(readFromPos>self->base.streamSize-readLen)) _fileError_return;
if (self->m_fpos!=readFromPos+self->m_offset){
if (!fileSeek64(self->m_file,readFromPos+self->m_offset,SEEK_SET)) _fileError_return;
}
if (!fileRead(self->m_file,out_data,out_data+readLen)) _fileError_return;
self->m_fpos=readFromPos+self->m_offset+readLen;
return hpatch_TRUE;
}
hpatch_inline static
hpatch_BOOL TFileStreamInput_open(TFileStreamInput* self,const char* fileName){
assert(self->m_file==0);
if (self->m_file) return hpatch_FALSE;
if (!fileOpenForRead(fileName,&self->m_file,&self->base.streamSize)) return hpatch_FALSE;
self->base.streamImport=self;
self->base.read=_read_file;
self->m_fpos=0;
self->m_offset=0;
self->fileError=hpatch_FALSE;
return hpatch_TRUE;
}
hpatch_inline static
void TFileStreamInput_setOffset(TFileStreamInput* self,size_t offset){
assert(self->m_offset==0);
assert(self->base.streamSize>=offset);
self->m_offset=offset;
self->base.streamSize-=offset;
}
hpatch_inline
static hpatch_BOOL TFileStreamInput_close(TFileStreamInput* self){
return fileClose(&self->m_file);
}
typedef struct TFileStreamOutput{
hpatch_TStreamOutput base;
hpatch_FileHandle m_file;
hpatch_StreamPos_t out_pos;
hpatch_StreamPos_t out_length;
hpatch_BOOL fileError;
hpatch_BOOL is_random_out;
} TFileStreamOutput;
hpatch_inline
static void TFileStreamOutput_init(TFileStreamOutput* self){
memset(self,0,sizeof(TFileStreamOutput));
}
static hpatch_BOOL _write_file(const hpatch_TStreamOutput* stream,hpatch_StreamPos_t writeToPos,
const TByte* data,const TByte* data_end){
size_t writeLen;
TFileStreamOutput* self=(TFileStreamOutput*)stream->streamImport;
assert(data<=data_end);
writeLen=(size_t)(data_end-data);
if (writeLen==0) return hpatch_TRUE;
if ((writeLen>self->base.streamSize)
||(writeToPos>self->base.streamSize-writeLen)) _fileError_return;
if (writeToPos!=self->out_pos){
if (self->is_random_out){
if (!fileSeek64(self->m_file,writeToPos,SEEK_SET)) _fileError_return;
self->out_pos=writeToPos;
}else{
_fileError_return;
}
}
if (!fileWrite(self->m_file,data,data+writeLen)) _fileError_return;
self->out_pos=writeToPos+writeLen;
self->out_length=(self->out_length>=self->out_pos)?self->out_length:self->out_pos;
return hpatch_TRUE;
}
hpatch_inline static
hpatch_BOOL TFileStreamOutput_open(TFileStreamOutput* self,const char* fileName,
hpatch_StreamPos_t max_file_length){
assert(self->m_file==0);
if (self->m_file) return hpatch_FALSE;
if (!fileOpenForCreateOrReWrite(fileName,&self->m_file)) return hpatch_FALSE;
self->base.streamImport=self;
self->base.streamSize=max_file_length;
self->base.write=_write_file;
self->out_pos=0;
self->out_length=0;
self->is_random_out=hpatch_FALSE;
self->fileError=hpatch_FALSE;
return hpatch_TRUE;
}
hpatch_inline static
void TFileStreamOutput_setRandomOut(TFileStreamOutput* self,hpatch_BOOL is_random_out){
self->is_random_out=is_random_out;
}
hpatch_inline static
hpatch_BOOL TFileStreamOutput_flush(TFileStreamOutput* self){
return (0!=fflush(self->m_file));
}
hpatch_inline static
hpatch_BOOL TFileStreamOutput_close(TFileStreamOutput* self){
return fileClose(&self->m_file);
}
#endif