blocxx
DataStreams.cpp
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2* Copyright (C) 2005, Vintela, Inc. All rights reserved.
3* Copyright (C) 2006, Novell, Inc. All rights reserved.
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32
33
39#include "blocxx/BLOCXX_config.h"
40#include "blocxx/Types.hpp"
42#include <cstring>
43
44namespace BLOCXX_NAMESPACE
45{
46
48int
50{
51 return (gptr() < egptr()) ? static_cast<unsigned char>(*gptr()) : EOF; // need a static_cast so a -1 doesn't turn into an EOF
52}
53
55std::streambuf::pos_type
56DataIStreamBuf::seekoff(off_type off, std::ios_base::seekdir way, std::ios_base::openmode which)
57{
58 pos_type ret = pos_type(off_type(-1));
59
60 char* begin = eback();
61 char* cur = gptr();
62 char* end = egptr();
63
64 off_type newOff = 0;
65
66 if (way == std::ios_base::cur)
67 {
68 newOff = cur - begin;
69 }
70 else if (way == std::ios_base::end)
71 {
72 newOff = end - begin;
73 }
74
75 if (newOff + off >= 0 && end - begin >= newOff + off)
76 {
77 setg(begin, begin + newOff + off, end);
78 ret = pos_type(newOff);
79 }
80
81 return ret;
82}
83
85std::streambuf::pos_type
86DataIStreamBuf::seekpos(pos_type sp, std::ios_base::openmode which)
87{
88 pos_type ret = pos_type(off_type(-1));
89
90 char* begin = eback();
91 char* end = egptr();
92
93 if (sp <= end - begin)
94 {
95 setg(begin, begin + sp, end);
96 ret = sp;
97 }
98
99 return ret;
100}
101
104 : std::streambuf()
105{
106 m_bfr.reserve(initialSize);
107}
109int
111{
112 m_bfr.push_back(c);
113 return 0;
114}
116std::streamsize
117DataOStreamBuf::xsputn(const char* s, std::streamsize n)
118{
119 m_bfr.insert(m_bfr.end(), s, s+n);
120 return n;
121}
122
123} // end namespace BLOCXX_NAMESPACE
124
virtual pos_type seekpos(pos_type sp, std::ios_base::openmode which)
virtual pos_type seekoff(off_type off, std::ios_base::seekdir way, std::ios_base::openmode which)
std::vector< unsigned char > m_bfr
DataOStreamBuf(size_t initialSize=256)
virtual std::streamsize xsputn(const char *s, std::streamsize n)
Taken from RFC 1321.