| 1 | ///////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: mstream.cpp |
| 3 | // Purpose: "Memory stream" classes |
| 4 | // Author: Guilhem Lavaux |
| 5 | // Modified by: |
| 6 | // Created: 04/01/98 |
| 7 | // RCS-ID: $Id$ |
| 8 | // Copyright: (c) Guilhem Lavaux |
| 9 | // Licence: wxWindows license |
| 10 | ///////////////////////////////////////////////////////////////////////////// |
| 11 | |
| 12 | #ifdef __GNUG__ |
| 13 | #pragma implementation "mstream.h" |
| 14 | #endif |
| 15 | |
| 16 | // For compilers that support precompilation, includes "wx.h". |
| 17 | #include "wx/wxprec.h" |
| 18 | #include <stdlib.h> |
| 19 | #include <wx/stream.h> |
| 20 | #include <wx/mstream.h> |
| 21 | |
| 22 | #ifdef __BORLANDC__ |
| 23 | #pragma hdrstop |
| 24 | #endif |
| 25 | |
| 26 | // ---------------------------------------------------------------------------- |
| 27 | // wxMemoryStreamBase |
| 28 | // ---------------------------------------------------------------------------- |
| 29 | wxMemoryStreamBase::wxMemoryStreamBase() |
| 30 | { |
| 31 | m_buffer = NULL; |
| 32 | m_iolimit = 0; |
| 33 | m_persistent = FALSE; |
| 34 | m_length = 0; |
| 35 | } |
| 36 | |
| 37 | wxMemoryStreamBase::~wxMemoryStreamBase() |
| 38 | { |
| 39 | if (!m_persistent && m_buffer) |
| 40 | free(m_buffer); |
| 41 | } |
| 42 | |
| 43 | bool wxMemoryStreamBase::ChangeBufferSize(size_t new_size) |
| 44 | { |
| 45 | if (m_iolimit == 1) |
| 46 | return FALSE; |
| 47 | |
| 48 | m_length = new_size; |
| 49 | if (!m_buffer) |
| 50 | m_buffer = (char *)malloc(m_length); |
| 51 | else |
| 52 | m_buffer = (char *)realloc(m_buffer, m_length); |
| 53 | |
| 54 | return (m_buffer != NULL); |
| 55 | } |
| 56 | |
| 57 | // ---------------------------------------------------------------------------- |
| 58 | // wxMemoryInputStream |
| 59 | // ---------------------------------------------------------------------------- |
| 60 | |
| 61 | wxMemoryInputStream::wxMemoryInputStream(const char *data, size_t len) |
| 62 | { |
| 63 | m_persistent = TRUE; |
| 64 | m_length = len; |
| 65 | m_buffer = (char *)data; // It's bad. |
| 66 | m_position_i = 0; |
| 67 | m_lastread = 0; |
| 68 | m_eof = FALSE; |
| 69 | m_iolimit = 1; |
| 70 | |
| 71 | m_i_streambuf->SetBufferIO(0); |
| 72 | } |
| 73 | |
| 74 | wxMemoryInputStream::~wxMemoryInputStream() |
| 75 | { |
| 76 | } |
| 77 | |
| 78 | char wxMemoryInputStream::Peek() |
| 79 | { |
| 80 | // wxStreamBuffer is disabled so just peek the current character. |
| 81 | |
| 82 | return m_buffer[m_position_i]; |
| 83 | } |
| 84 | |
| 85 | size_t wxMemoryInputStream::DoRead(void *buffer, size_t size) |
| 86 | { |
| 87 | if (m_iolimit == 2) { |
| 88 | m_eof = TRUE; |
| 89 | return 0; |
| 90 | } |
| 91 | if (m_position_i+size > m_length) |
| 92 | size = m_length-m_position_i; |
| 93 | |
| 94 | memcpy((void *)((unsigned long)buffer+m_position_i), m_buffer, size); |
| 95 | m_position_i += size; |
| 96 | |
| 97 | return size; |
| 98 | } |
| 99 | |
| 100 | off_t wxMemoryInputStream::DoSeekInput(off_t pos, wxSeekMode mode) |
| 101 | { |
| 102 | if (m_iolimit == 2) |
| 103 | return 0; |
| 104 | |
| 105 | switch (mode) { |
| 106 | case wxFromStart: |
| 107 | if ((size_t)pos > m_length) |
| 108 | return m_position_i; |
| 109 | return (m_position_i = pos); |
| 110 | |
| 111 | case wxFromCurrent: |
| 112 | if ((size_t)(m_position_i+pos) > m_length) |
| 113 | return m_position_i; |
| 114 | |
| 115 | return (m_position_i += pos); |
| 116 | |
| 117 | case wxFromEnd: |
| 118 | if ((size_t)(m_length-pos) > m_length) |
| 119 | return m_position_i; |
| 120 | |
| 121 | return (m_position_i = m_length-pos); |
| 122 | } |
| 123 | |
| 124 | return m_position_i; |
| 125 | } |
| 126 | |
| 127 | // ---------------------------------------------------------------------------- |
| 128 | // wxMemoryOutputStream |
| 129 | // ---------------------------------------------------------------------------- |
| 130 | |
| 131 | wxMemoryOutputStream::wxMemoryOutputStream(char *data, size_t len) |
| 132 | { |
| 133 | m_persistent = FALSE; |
| 134 | m_buffer = data; |
| 135 | m_length = len; |
| 136 | m_position_o = 0; |
| 137 | m_lastwrite = 0; |
| 138 | m_bad = FALSE; |
| 139 | m_iolimit = 2; |
| 140 | |
| 141 | m_o_streambuf->SetBufferIO(0); |
| 142 | } |
| 143 | |
| 144 | wxMemoryOutputStream::~wxMemoryOutputStream() |
| 145 | { |
| 146 | Sync(); |
| 147 | } |
| 148 | |
| 149 | size_t wxMemoryOutputStream::DoWrite(const void *buffer, size_t size) |
| 150 | { |
| 151 | if (m_iolimit == 1) { |
| 152 | m_bad = TRUE; |
| 153 | return 0; |
| 154 | } |
| 155 | |
| 156 | if (m_position_o+size > m_length) |
| 157 | if (!ChangeBufferSize(m_position_o+size)) { |
| 158 | m_bad = TRUE; |
| 159 | return 0; |
| 160 | } |
| 161 | |
| 162 | memcpy(m_buffer+m_position_o, buffer, size); |
| 163 | m_position_o += size; |
| 164 | |
| 165 | return size; |
| 166 | } |
| 167 | |
| 168 | off_t wxMemoryOutputStream::DoSeekOutput(off_t pos, wxSeekMode mode) |
| 169 | { |
| 170 | if (m_iolimit == 1) |
| 171 | return 0; |
| 172 | |
| 173 | switch (mode) { |
| 174 | case wxFromStart: |
| 175 | if ((size_t)pos > m_length) |
| 176 | return m_position_o; |
| 177 | return (m_position_o = pos); |
| 178 | |
| 179 | case wxFromCurrent: |
| 180 | if ((size_t)(m_position_o+pos) > m_length) |
| 181 | return m_position_o; |
| 182 | |
| 183 | return (m_position_o += pos); |
| 184 | |
| 185 | case wxFromEnd: |
| 186 | if ((size_t)(m_length-pos) > m_length) |
| 187 | return m_position_o; |
| 188 | |
| 189 | return (m_position_o = m_length-pos); |
| 190 | } |
| 191 | |
| 192 | return m_position_o; |
| 193 | } |
| 194 | |
| 195 | // ---------------------------------------------------------------------------- |
| 196 | // wxMemoryStream |
| 197 | // ---------------------------------------------------------------------------- |
| 198 | |
| 199 | wxMemoryStream::wxMemoryStream(char *data, size_t len) |
| 200 | : wxMemoryInputStream(NULL, 0), wxMemoryOutputStream(NULL, 0) |
| 201 | { |
| 202 | m_persistent = FALSE; |
| 203 | m_buffer = data; |
| 204 | m_length = len; |
| 205 | m_iolimit = 0; |
| 206 | } |
| 207 | |
| 208 | wxMemoryStream::~wxMemoryStream() |
| 209 | { |
| 210 | } |