| 1 | ///////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: zstream.cpp |
| 3 | // Purpose: Compressed stream classes |
| 4 | // Author: Guilhem Lavaux |
| 5 | // Modified by: |
| 6 | // Created: 11/07/98 |
| 7 | // RCS-ID: $Id$ |
| 8 | // Copyright: (c) Guilhem Lavaux |
| 9 | // Licence: wxWindows licence |
| 10 | ///////////////////////////////////////////////////////////////////////////// |
| 11 | |
| 12 | #ifdef __GNUG__ |
| 13 | #pragma implementation "zstream.h" |
| 14 | #endif |
| 15 | |
| 16 | // For compilers that support precompilation, includes "wx.h". |
| 17 | #include "wx/wxprec.h" |
| 18 | |
| 19 | #ifdef __BORLANDC__ |
| 20 | #pragma hdrstop |
| 21 | #endif |
| 22 | |
| 23 | #if wxUSE_ZLIB && wxUSE_STREAMS |
| 24 | |
| 25 | #include "wx/zstream.h" |
| 26 | #include "wx/utils.h" |
| 27 | #include "wx/intl.h" |
| 28 | #include "wx/log.h" |
| 29 | |
| 30 | // When using configure, the path must be "zlib.h" I don't know |
| 31 | // what other ports (wxMac, wxMotif without configure) need here. |
| 32 | // If we are building with configure (defines __WX_SETUP_H__), |
| 33 | // we trust the zlib path is given as a -I option. |
| 34 | #if defined(__WXMSW__) && !defined(__WX_SETUP_H__) |
| 35 | #include "..\zlib\zlib.h" |
| 36 | #else |
| 37 | #include "zlib.h" |
| 38 | #endif |
| 39 | |
| 40 | #define ZSTREAM_BUFFER_SIZE 1024 |
| 41 | |
| 42 | ////////////////////// |
| 43 | // wxZlibInputStream |
| 44 | ////////////////////// |
| 45 | |
| 46 | wxZlibInputStream::wxZlibInputStream(wxInputStream& stream) |
| 47 | : wxFilterInputStream(stream) |
| 48 | { |
| 49 | int err; |
| 50 | |
| 51 | // I need a private stream buffer. |
| 52 | m_inflate = new z_stream_s; |
| 53 | |
| 54 | m_inflate->zalloc = (alloc_func)0; |
| 55 | m_inflate->zfree = (free_func)0; |
| 56 | m_inflate->opaque = (voidpf)0; |
| 57 | |
| 58 | err = inflateInit(m_inflate); |
| 59 | if (err != Z_OK) { |
| 60 | inflateEnd(m_inflate); |
| 61 | delete m_inflate; |
| 62 | return; |
| 63 | } |
| 64 | |
| 65 | m_z_buffer = new unsigned char[ZSTREAM_BUFFER_SIZE]; |
| 66 | m_z_size = ZSTREAM_BUFFER_SIZE; |
| 67 | |
| 68 | m_inflate->avail_in = 0; |
| 69 | m_inflate->next_in = NULL; |
| 70 | } |
| 71 | |
| 72 | wxZlibInputStream::~wxZlibInputStream() |
| 73 | { |
| 74 | inflateEnd(m_inflate); |
| 75 | delete m_inflate; |
| 76 | } |
| 77 | |
| 78 | size_t wxZlibInputStream::OnSysRead(void *buffer, size_t size) |
| 79 | { |
| 80 | int err; |
| 81 | |
| 82 | m_inflate->next_out = (unsigned char *)buffer; |
| 83 | m_inflate->avail_out = size; |
| 84 | |
| 85 | while (m_inflate->avail_out > 0) { |
| 86 | if (m_inflate->avail_in == 0) { |
| 87 | |
| 88 | m_parent_i_stream->Read(m_z_buffer, m_z_size); |
| 89 | m_inflate->next_in = m_z_buffer; |
| 90 | m_inflate->avail_in = m_parent_i_stream->LastRead(); |
| 91 | |
| 92 | if (m_parent_i_stream->LastError() != wxStream_NOERROR) |
| 93 | return (size - m_inflate->avail_in); |
| 94 | } |
| 95 | err = inflate(m_inflate, Z_FINISH); |
| 96 | if (err == Z_STREAM_END) |
| 97 | return (size - m_inflate->avail_in); |
| 98 | } |
| 99 | |
| 100 | return size-m_inflate->avail_in; |
| 101 | } |
| 102 | |
| 103 | ////////////////////// |
| 104 | // wxZlibOutputStream |
| 105 | ////////////////////// |
| 106 | |
| 107 | wxZlibOutputStream::wxZlibOutputStream(wxOutputStream& stream) |
| 108 | : wxFilterOutputStream(stream) |
| 109 | { |
| 110 | int err; |
| 111 | |
| 112 | m_deflate = new z_stream_s; |
| 113 | |
| 114 | m_deflate->zalloc = (alloc_func)0; |
| 115 | m_deflate->zfree = (free_func)0; |
| 116 | m_deflate->opaque = (voidpf)0; |
| 117 | |
| 118 | err = deflateInit(m_deflate, Z_DEFAULT_COMPRESSION); |
| 119 | if (err != Z_OK) { |
| 120 | deflateEnd(m_deflate); |
| 121 | return; |
| 122 | } |
| 123 | |
| 124 | m_z_buffer = new unsigned char[ZSTREAM_BUFFER_SIZE]; |
| 125 | m_z_size = ZSTREAM_BUFFER_SIZE; |
| 126 | |
| 127 | m_deflate->avail_in = 0; |
| 128 | m_deflate->next_out = m_z_buffer; |
| 129 | m_deflate->avail_out = m_z_size; |
| 130 | } |
| 131 | |
| 132 | wxZlibOutputStream::~wxZlibOutputStream() |
| 133 | { |
| 134 | int err; |
| 135 | |
| 136 | Sync(); |
| 137 | |
| 138 | err = deflate(m_deflate, Z_FINISH); |
| 139 | if (err != Z_STREAM_END) |
| 140 | { |
| 141 | wxLogDebug( wxT("wxZlibOutputStream: an error occured while closing the stream.\n") ); |
| 142 | return; |
| 143 | } |
| 144 | |
| 145 | deflateEnd(m_deflate); |
| 146 | |
| 147 | delete[] m_z_buffer; |
| 148 | } |
| 149 | |
| 150 | void wxZlibOutputStream::Sync() |
| 151 | { |
| 152 | int err; |
| 153 | |
| 154 | m_parent_o_stream->Write(m_z_buffer, m_z_size-m_deflate->avail_out); |
| 155 | m_deflate->next_out = m_z_buffer; |
| 156 | m_deflate->avail_out = m_z_size; |
| 157 | |
| 158 | err = deflate(m_deflate, Z_FULL_FLUSH); |
| 159 | if (err != Z_OK) { |
| 160 | return; |
| 161 | } |
| 162 | |
| 163 | // Fixed by "Stefan Csomor" <csomor@advancedconcepts.ch> |
| 164 | while( m_deflate->avail_out == 0 ) |
| 165 | { |
| 166 | m_parent_o_stream->Write(m_z_buffer, m_z_size ); |
| 167 | m_deflate->next_out = m_z_buffer; |
| 168 | m_deflate->avail_out = m_z_size; |
| 169 | err = deflate(m_deflate, Z_FULL_FLUSH); |
| 170 | if (err != Z_OK) { |
| 171 | return; |
| 172 | } |
| 173 | } |
| 174 | // End |
| 175 | |
| 176 | m_parent_o_stream->Write(m_z_buffer, m_z_size-m_deflate->avail_out); |
| 177 | m_deflate->next_out = m_z_buffer; |
| 178 | m_deflate->avail_out = m_z_size; |
| 179 | } |
| 180 | |
| 181 | size_t wxZlibOutputStream::OnSysWrite(const void *buffer, size_t size) |
| 182 | { |
| 183 | int err; |
| 184 | |
| 185 | m_deflate->next_in = (unsigned char *)buffer; |
| 186 | m_deflate->avail_in = size; |
| 187 | |
| 188 | while (m_deflate->avail_in > 0) { |
| 189 | |
| 190 | if (m_deflate->avail_out == 0) { |
| 191 | m_parent_o_stream->Write(m_z_buffer, m_z_size); |
| 192 | if (m_parent_o_stream->LastError() != wxStream_NOERROR) |
| 193 | return (size - m_deflate->avail_in); |
| 194 | |
| 195 | m_deflate->next_out = m_z_buffer; |
| 196 | m_deflate->avail_out = m_z_size; |
| 197 | } |
| 198 | |
| 199 | err = deflate(m_deflate, Z_NO_FLUSH); |
| 200 | if (err != Z_OK) |
| 201 | return (size - m_deflate->avail_in); |
| 202 | } |
| 203 | return size; |
| 204 | } |
| 205 | |
| 206 | #endif |
| 207 | // wxUSE_ZLIB && wxUSE_STREAMS |
| 208 | |