2 Copyright (c) 2006-2009, 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.
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11 notice, this list of conditions and the following disclaimer in the
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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.
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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 const byte_t* RoData() const { return m_p; }
65 inline byte_t* CurrentData() { return m_p + m_size; }
66 inline ui32_t Length() const { return m_size; }
67 inline ui32_t Remainder() const { return m_capacity - m_size; }
69 inline bool AddOffset(ui32_t offset) {
70 if ( ( m_size + offset ) > m_capacity )
78 inline bool WriteRaw(const byte_t* p, ui32_t buf_len) {
79 if ( ( m_size + buf_len ) > m_capacity )
82 memcpy(m_p + m_size, p, buf_len);
87 bool WriteBER(ui64_t i, ui32_t ber_len);
89 inline bool WriteUi8(ui8_t i) {
90 if ( ( m_size + 1 ) > m_capacity )
98 inline bool WriteUi16BE(ui16_t i) {
99 if ( ( m_size + sizeof(ui16_t) ) > m_capacity )
102 i2p<ui16_t>(KM_i16_BE(i), m_p + m_size);
103 m_size += sizeof(ui16_t);
107 inline bool WriteUi32BE(ui32_t i) {
108 if ( ( m_size + sizeof(ui32_t) ) > m_capacity )
111 i2p<ui32_t>(KM_i32_BE(i), m_p + m_size);
112 m_size += sizeof(ui32_t);
116 inline bool WriteUi64BE(ui64_t i) {
117 if ( ( m_size + sizeof(ui64_t) ) > m_capacity )
120 i2p<ui64_t>(KM_i64_BE(i), m_p + m_size);
121 m_size += sizeof(ui64_t);
129 KM_NO_COPY_CONSTRUCT(MemIOReader);
135 ui32_t m_size; // this is sort of a misnomer, when we are reading it measures offset
138 MemIOReader(const byte_t* p, ui32_t c) :
139 m_p(p), m_capacity(c), m_size(0) {
140 assert(m_p); assert(m_capacity);
143 MemIOReader(const ByteString* Buf);
146 inline void Reset() { m_size = 0; }
147 inline const byte_t* Data() const { return m_p; }
148 inline const byte_t* CurrentData() const { return m_p + m_size; }
149 inline ui32_t Offset() const { return m_size; }
150 inline ui32_t Remainder() const { return m_capacity - m_size; }
152 inline bool SkipOffset(ui32_t offset) {
153 if ( ( m_size + offset ) > m_capacity )
160 inline bool ReadRaw(byte_t* p, ui32_t buf_len) {
161 if ( ( m_size + buf_len ) > m_capacity )
164 memcpy(p, m_p + m_size, buf_len);
169 bool ReadBER(ui64_t* i, ui32_t* ber_len);
171 inline bool ReadUi8(ui8_t* i) {
173 if ( ( m_size + 1 ) > m_capacity )
176 *i = *(m_p + m_size);
181 inline bool ReadUi16BE(ui16_t* i) {
183 if ( ( m_size + sizeof(ui16_t) ) > m_capacity )
186 *i = KM_i16_BE(cp2i<ui16_t>(m_p + m_size));
187 m_size += sizeof(ui16_t);
191 inline bool ReadUi32BE(ui32_t* i) {
193 if ( ( m_size + sizeof(ui32_t) ) > m_capacity )
196 *i = KM_i32_BE(cp2i<ui32_t>(m_p + m_size));
197 m_size += sizeof(ui32_t);
201 inline bool ReadUi64BE(ui64_t* i) {
203 if ( ( m_size + sizeof(ui64_t) ) > m_capacity )
206 *i = KM_i64_BE(cp2i<ui64_t>(m_p + m_size));
207 m_size += sizeof(ui64_t);
214 UnarchiveString(MemIOReader& Reader, std::string& str)
217 if ( ! Reader.ReadUi32BE(&str_length) ) return false;
218 str.assign((const char*)Reader.CurrentData(), str_length);
219 if ( ! Reader.SkipOffset(str_length) ) return false;
225 ArchiveString(MemIOWriter& Writer, const std::string& str)
227 if ( ! Writer.WriteUi32BE(str.length()) ) return false;
228 if ( ! Writer.WriteRaw((const byte_t*)str.c_str(), str.length()) ) return false;
234 #endif // _KM_MEMIO_H_