2 Copyright (c) 2006-2008, John Hurst
5 Redistribution and use in source and binary forms, with or without
6 modification, are permitted provided that the following conditions
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9 notice, this list of conditions and the following disclaimer.
10 2. Redistributions in binary form must reproduce the above copyright
11 notice, this list of conditions and the following disclaimer in the
12 documentation and/or other materials provided with the distribution.
13 3. The name of the author may not be used to endorse or promote products
14 derived from this software without specific prior written permission.
16 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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18 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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29 \brief abstraction for byte-oriented conversion of integers and objects
35 #include <KM_platform.h>
46 KM_NO_COPY_CONSTRUCT(MemIOWriter);
55 MemIOWriter(byte_t* p, ui32_t c) : m_p(p), m_capacity(c), m_size(0) {
56 assert(m_p); assert(m_capacity);
59 MemIOWriter(ByteString* Buf);
62 inline void Reset() { m_size = 0; }
63 inline byte_t* Data() { return m_p; }
64 inline byte_t* CurrentData() { return m_p + m_size; }
65 inline ui32_t Length() { return m_size; }
66 inline ui32_t Remainder() { return m_capacity - m_size; }
68 inline bool AddOffset(ui32_t offset) {
69 if ( ( m_size + offset ) > m_capacity )
77 inline bool WriteRaw(const byte_t* p, ui32_t buf_len) {
78 if ( ( m_size + buf_len ) > m_capacity )
81 memcpy(m_p + m_size, p, buf_len);
86 bool WriteBER(ui64_t i, ui32_t ber_len);
88 inline bool WriteUi8(ui8_t i) {
89 if ( ( m_size + 1 ) > m_capacity )
97 inline bool WriteUi16BE(ui16_t i) {
98 if ( ( m_size + sizeof(ui16_t) ) > m_capacity )
101 i2p<ui16_t>(KM_i16_BE(i), m_p + m_size);
102 m_size += sizeof(ui16_t);
106 inline bool WriteUi32BE(ui32_t i) {
107 if ( ( m_size + sizeof(ui32_t) ) > m_capacity )
110 i2p<ui32_t>(KM_i32_BE(i), m_p + m_size);
111 m_size += sizeof(ui32_t);
115 inline bool WriteUi64BE(ui64_t i) {
116 if ( ( m_size + sizeof(ui64_t) ) > m_capacity )
119 i2p<ui64_t>(KM_i64_BE(i), m_p + m_size);
120 m_size += sizeof(ui64_t);
128 KM_NO_COPY_CONSTRUCT(MemIOReader);
134 ui32_t m_size; // this is sort of a misnomer, when we are reading it measures offset
137 MemIOReader(const byte_t* p, ui32_t c) :
138 m_p(p), m_capacity(c), m_size(0) {
139 assert(m_p); assert(m_capacity);
142 MemIOReader(const ByteString* Buf);
145 inline void Reset() { m_size = 0; }
146 inline const byte_t* Data() { return m_p; }
147 inline const byte_t* CurrentData() { return m_p + m_size; }
148 inline ui32_t Offset() { return m_size; }
149 inline ui32_t Remainder() { return m_capacity - m_size; }
151 inline bool SkipOffset(ui32_t offset) {
152 if ( ( m_size + offset ) > m_capacity )
159 inline bool ReadRaw(byte_t* p, ui32_t buf_len) {
160 if ( ( m_size + buf_len ) > m_capacity )
163 memcpy(p, m_p + m_size, buf_len);
168 bool ReadBER(ui64_t* i, ui32_t* ber_len);
170 inline bool ReadUi8(ui8_t* i) {
172 if ( ( m_size + 1 ) > m_capacity )
175 *i = *(m_p + m_size);
180 inline bool ReadUi16BE(ui16_t* i) {
182 if ( ( m_size + sizeof(ui16_t) ) > m_capacity )
185 *i = KM_i16_BE(cp2i<ui16_t>(m_p + m_size));
186 m_size += sizeof(ui16_t);
190 inline bool ReadUi32BE(ui32_t* i) {
192 if ( ( m_size + sizeof(ui32_t) ) > m_capacity )
195 *i = KM_i32_BE(cp2i<ui32_t>(m_p + m_size));
196 m_size += sizeof(ui32_t);
200 inline bool ReadUi64BE(ui64_t* i) {
202 if ( ( m_size + sizeof(ui64_t) ) > m_capacity )
205 *i = KM_i64_BE(cp2i<ui64_t>(m_p + m_size));
206 m_size += sizeof(ui64_t);
213 UnarchiveString(MemIOReader& Reader, std::string& str)
216 if ( ! Reader.ReadUi32BE(&str_length) ) return false;
217 str.assign((const char*)Reader.CurrentData(), str_length);
218 if ( ! Reader.SkipOffset(str_length) ) return false;
224 ArchiveString(MemIOWriter& Writer, const std::string& str)
226 if ( ! Writer.WriteUi32BE(str.length()) ) return false;
227 if ( ! Writer.WriteRaw((const byte_t*)str.c_str(), str.length()) ) return false;
233 #endif // _KM_MEMIO_H_