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snes9x
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Correct stream revert behavior (closes #353)

This commit is contained in:
OV2 2018-11-06 22:05:38 +01:00
parent 6c9bd1a580
commit 9f795150fc
2 changed files with 35 additions and 13 deletions
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35
stream.cpp
View File

@ -253,6 +253,24 @@ std::string Stream::getline (bool &eof)
return (ret);
}
size_t Stream::pos_from_origin_offset(uint8 origin, int32 offset)
{
size_t position = 0;
switch (origin)
{
case SEEK_SET:
position = offset;
break;
case SEEK_END:
position = size() + offset;
break;
case SEEK_CUR:
position = pos() + offset;
break;
}
return position;
}
// snes9x.h FSTREAM Stream
fStream::fStream (FSTREAM f)
@ -299,9 +317,9 @@ size_t fStream::size (void)
return sz;
}
int fStream::revert (size_t from, size_t offset)
int fStream::revert (uint8 origin, int32 offset)
{
return (REVERT_FSTREAM(fp, offset, from));
return (REVERT_FSTREAM(fp, offset, origin));
}
void fStream::closeStream()
@ -428,9 +446,9 @@ size_t unzStream::size (void)
return info.uncompressed_size;
}
int unzStream::revert (size_t from, size_t offset)
int unzStream::revert (uint8 origin, int32 offset)
{
size_t target_pos = from + offset;
size_t target_pos = pos_from_origin_offset(origin, offset);
// new pos inside buffered data
if (target_pos >= buf_pos_in_unzipped && target_pos < buf_pos_in_unzipped + bytes_in_buf)
@ -547,9 +565,9 @@ size_t memStream::size (void)
return msize;
}
int memStream::revert (size_t from, size_t offset)
int memStream::revert (uint8 origin, int32 offset)
{
size_t pos = from + offset;
size_t pos = pos_from_origin_offset(origin, offset);
if(pos > msize)
return -1;
@ -610,9 +628,10 @@ size_t nulStream::size (void)
return bytes_written;
}
int nulStream::revert (size_t from, size_t offset)
int nulStream::revert (uint8 origin, int32 offset)
{
bytes_written = from + offset;
size_t target_pos = pos_from_origin_offset(origin, offset);
bytes_written = target_pos;
return 0;
}

13
stream.h
View File

@ -208,8 +208,11 @@ class Stream
virtual size_t write (void *, size_t) = 0;
virtual size_t pos (void) = 0;
virtual size_t size (void) = 0;
virtual int revert (size_t from, size_t offset) = 0;
virtual int revert (uint8 origin, int32 offset) = 0;
virtual void closeStream() = 0;
protected:
size_t pos_from_origin_offset(uint8 origin, int32 offset);
};
class fStream : public Stream
@ -223,7 +226,7 @@ class fStream : public Stream
virtual size_t write (void *, size_t);
virtual size_t pos (void);
virtual size_t size (void);
virtual int revert (size_t from, size_t offset);
virtual int revert (uint8 origin, int32 offset);
virtual void closeStream();
private:
@ -250,7 +253,7 @@ class unzStream : public Stream
virtual size_t write (void *, size_t);
virtual size_t pos (void);
virtual size_t size (void);
virtual int revert (size_t from, size_t offset);
virtual int revert (uint8 origin, int32 offset);
virtual void closeStream();
private:
@ -279,7 +282,7 @@ class memStream : public Stream
virtual size_t write (void *, size_t);
virtual size_t pos (void);
virtual size_t size (void);
virtual int revert (size_t from, size_t offset);
virtual int revert (uint8 origin, int32 offset);
virtual void closeStream();
private:
@ -304,7 +307,7 @@ class nulStream : public Stream
virtual size_t write (void *, size_t);
virtual size_t pos (void);
virtual size_t size (void);
virtual int revert (size_t from, size_t offset);
virtual int revert (uint8 origin, int32 offset);
virtual void closeStream();
private: