| 1 | ////////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: zstream.cpp |
| 3 | // Purpose: Compressed stream classes |
| 4 | // Author: Guilhem Lavaux |
| 5 | // Modified by: Mike Wetherell |
| 6 | // Created: 11/07/98 |
| 7 | // RCS-ID: $Id$ |
| 8 | // Copyright: (c) Guilhem Lavaux |
| 9 | // Licence: wxWindows licence |
| 10 | ///////////////////////////////////////////////////////////////////////////// |
| 11 | |
| 12 | #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA) |
| 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 | // normally, the compiler options should contain -I../zlib, but it is |
| 31 | // apparently not the case for all MSW makefiles and so, unless we use |
| 32 | // configure (which defines __WX_SETUP_H__) or it is explicitly overridden by |
| 33 | // the user (who can define wxUSE_ZLIB_H_IN_PATH), we hardcode the path here |
| 34 | #if defined(__WXMSW__) && !defined(__WX_SETUP_H__) && !defined(wxUSE_ZLIB_H_IN_PATH) |
| 35 | #include "../zlib/zlib.h" |
| 36 | #else |
| 37 | #include "zlib.h" |
| 38 | #endif |
| 39 | |
| 40 | enum { |
| 41 | #ifdef __WIN16__ |
| 42 | ZSTREAM_BUFFER_SIZE = 4096 |
| 43 | #else |
| 44 | ZSTREAM_BUFFER_SIZE = 16384 |
| 45 | #endif |
| 46 | }; |
| 47 | |
| 48 | ////////////////////// |
| 49 | // wxZlibInputStream |
| 50 | ////////////////////// |
| 51 | |
| 52 | wxZlibInputStream::wxZlibInputStream(wxInputStream& stream, int flags) |
| 53 | : wxFilterInputStream(stream) |
| 54 | { |
| 55 | m_inflate = NULL; |
| 56 | m_z_buffer = new unsigned char[ZSTREAM_BUFFER_SIZE]; |
| 57 | m_z_size = ZSTREAM_BUFFER_SIZE; |
| 58 | m_pos = 0; |
| 59 | |
| 60 | if (m_z_buffer) { |
| 61 | m_inflate = new z_stream_s; |
| 62 | |
| 63 | if (m_inflate) { |
| 64 | m_inflate->zalloc = (alloc_func)0; |
| 65 | m_inflate->zfree = (free_func)0; |
| 66 | m_inflate->opaque = (voidpf)0; |
| 67 | m_inflate->avail_in = 0; |
| 68 | m_inflate->next_in = NULL; |
| 69 | m_inflate->next_out = NULL; |
| 70 | |
| 71 | int bits = (flags & wxZLIB_NO_HEADER) ? -MAX_WBITS : MAX_WBITS; |
| 72 | |
| 73 | if (inflateInit2(m_inflate, bits) == Z_OK) |
| 74 | return; |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | wxLogError(_("Can't initialize zlib inflate stream.")); |
| 79 | m_lasterror = wxSTREAM_READ_ERROR; |
| 80 | } |
| 81 | |
| 82 | wxZlibInputStream::~wxZlibInputStream() |
| 83 | { |
| 84 | inflateEnd(m_inflate); |
| 85 | delete m_inflate; |
| 86 | |
| 87 | delete [] m_z_buffer; |
| 88 | } |
| 89 | |
| 90 | size_t wxZlibInputStream::OnSysRead(void *buffer, size_t size) |
| 91 | { |
| 92 | wxASSERT_MSG(m_inflate && m_z_buffer, wxT("Inflate stream not open")); |
| 93 | |
| 94 | if (!m_inflate || !m_z_buffer) |
| 95 | m_lasterror = wxSTREAM_READ_ERROR; |
| 96 | if (!IsOk() || !size) |
| 97 | return 0; |
| 98 | |
| 99 | int err = Z_OK; |
| 100 | m_inflate->next_out = (unsigned char *)buffer; |
| 101 | m_inflate->avail_out = size; |
| 102 | |
| 103 | while (err == Z_OK && m_inflate->avail_out > 0) { |
| 104 | if (m_inflate->avail_in == 0) { |
| 105 | m_parent_i_stream->Read(m_z_buffer, m_z_size); |
| 106 | m_inflate->next_in = m_z_buffer; |
| 107 | m_inflate->avail_in = m_parent_i_stream->LastRead(); |
| 108 | |
| 109 | if (m_inflate->avail_in == 0) { |
| 110 | if (m_parent_i_stream->Eof()) |
| 111 | wxLogError(_("Can't read inflate stream: unexpected EOF in underlying stream.")); |
| 112 | m_lasterror = wxSTREAM_READ_ERROR; |
| 113 | break; |
| 114 | } |
| 115 | } |
| 116 | err = inflate(m_inflate, Z_NO_FLUSH); |
| 117 | } |
| 118 | |
| 119 | if (err == Z_STREAM_END) { |
| 120 | // Unread any data taken from past the end of the deflate stream, so that |
| 121 | // any additional data can be read from the underlying stream (the crc |
| 122 | // in a gzip for example) |
| 123 | if (m_inflate->avail_in) { |
| 124 | m_parent_i_stream->Ungetch(m_inflate->next_in, m_inflate->avail_in); |
| 125 | m_inflate->avail_in = 0; |
| 126 | } |
| 127 | m_lasterror = wxSTREAM_EOF; |
| 128 | } else if (err != Z_OK) { |
| 129 | wxLogError(_("Can't read from inflate stream (zlib error %d)."), err); |
| 130 | m_lasterror = wxSTREAM_READ_ERROR; |
| 131 | } |
| 132 | |
| 133 | size -= m_inflate->avail_out; |
| 134 | m_pos += size; |
| 135 | return size; |
| 136 | } |
| 137 | |
| 138 | ////////////////////// |
| 139 | // wxZlibOutputStream |
| 140 | ////////////////////// |
| 141 | |
| 142 | wxZlibOutputStream::wxZlibOutputStream(wxOutputStream& stream, |
| 143 | int level, |
| 144 | int flags) |
| 145 | : wxFilterOutputStream(stream) |
| 146 | { |
| 147 | m_deflate = NULL; |
| 148 | m_z_buffer = new unsigned char[ZSTREAM_BUFFER_SIZE]; |
| 149 | m_z_size = ZSTREAM_BUFFER_SIZE; |
| 150 | m_pos = 0; |
| 151 | |
| 152 | if ( level == -1 ) |
| 153 | { |
| 154 | level = Z_DEFAULT_COMPRESSION; |
| 155 | } |
| 156 | else |
| 157 | { |
| 158 | wxASSERT_MSG(level >= 0 && level <= 9, wxT("wxZlibOutputStream compression level must be between 0 and 9!")); |
| 159 | } |
| 160 | |
| 161 | if (m_z_buffer) { |
| 162 | m_deflate = new z_stream_s; |
| 163 | |
| 164 | if (m_deflate) { |
| 165 | m_deflate->zalloc = (alloc_func)0; |
| 166 | m_deflate->zfree = (free_func)0; |
| 167 | m_deflate->opaque = (voidpf)0; |
| 168 | m_deflate->avail_in = 0; |
| 169 | m_deflate->next_out = m_z_buffer; |
| 170 | m_deflate->avail_out = m_z_size; |
| 171 | |
| 172 | int bits = (flags & wxZLIB_NO_HEADER) ? -MAX_WBITS : MAX_WBITS; |
| 173 | |
| 174 | if (deflateInit2(m_deflate, level, Z_DEFLATED, bits, |
| 175 | 8, Z_DEFAULT_STRATEGY) == Z_OK) |
| 176 | return; |
| 177 | } |
| 178 | } |
| 179 | |
| 180 | wxLogError(_("Can't initialize zlib deflate stream.")); |
| 181 | m_lasterror = wxSTREAM_WRITE_ERROR; |
| 182 | } |
| 183 | |
| 184 | wxZlibOutputStream::~wxZlibOutputStream() |
| 185 | { |
| 186 | if (m_deflate && m_z_buffer) |
| 187 | DoFlush(true); |
| 188 | deflateEnd(m_deflate); |
| 189 | delete m_deflate; |
| 190 | |
| 191 | delete[] m_z_buffer; |
| 192 | } |
| 193 | |
| 194 | void wxZlibOutputStream::DoFlush(bool final) |
| 195 | { |
| 196 | wxASSERT_MSG(m_deflate && m_z_buffer, wxT("Deflate stream not open")); |
| 197 | |
| 198 | if (!m_deflate || !m_z_buffer) |
| 199 | m_lasterror = wxSTREAM_WRITE_ERROR; |
| 200 | if (!IsOk()) |
| 201 | return; |
| 202 | |
| 203 | int err = Z_OK; |
| 204 | bool done = false; |
| 205 | |
| 206 | while (err == Z_OK || err == Z_STREAM_END) { |
| 207 | size_t len = m_z_size - m_deflate->avail_out; |
| 208 | if (len) { |
| 209 | if (m_parent_o_stream->Write(m_z_buffer, len).LastWrite() != len) { |
| 210 | m_lasterror = wxSTREAM_WRITE_ERROR; |
| 211 | wxLogDebug(wxT("wxZlibOutputStream: Error writing to underlying stream")); |
| 212 | break; |
| 213 | } |
| 214 | m_deflate->next_out = m_z_buffer; |
| 215 | m_deflate->avail_out = m_z_size; |
| 216 | } |
| 217 | |
| 218 | if (done) |
| 219 | break; |
| 220 | err = deflate(m_deflate, final ? Z_FINISH : Z_FULL_FLUSH); |
| 221 | done = m_deflate->avail_out != 0 || err == Z_STREAM_END; |
| 222 | } |
| 223 | } |
| 224 | |
| 225 | size_t wxZlibOutputStream::OnSysWrite(const void *buffer, size_t size) |
| 226 | { |
| 227 | wxASSERT_MSG(m_deflate && m_z_buffer, wxT("Deflate stream not open")); |
| 228 | |
| 229 | if (!m_deflate || !m_z_buffer) |
| 230 | m_lasterror = wxSTREAM_WRITE_ERROR; |
| 231 | if (!IsOk() || !size) |
| 232 | return 0; |
| 233 | |
| 234 | int err = Z_OK; |
| 235 | m_deflate->next_in = (unsigned char *)buffer; |
| 236 | m_deflate->avail_in = size; |
| 237 | |
| 238 | while (err == Z_OK && m_deflate->avail_in > 0) { |
| 239 | if (m_deflate->avail_out == 0) { |
| 240 | m_parent_o_stream->Write(m_z_buffer, m_z_size); |
| 241 | if (m_parent_o_stream->LastWrite() != m_z_size) { |
| 242 | m_lasterror = wxSTREAM_WRITE_ERROR; |
| 243 | wxLogDebug(wxT("wxZlibOutputStream: Error writing to underlying stream")); |
| 244 | break; |
| 245 | } |
| 246 | |
| 247 | m_deflate->next_out = m_z_buffer; |
| 248 | m_deflate->avail_out = m_z_size; |
| 249 | } |
| 250 | |
| 251 | err = deflate(m_deflate, Z_NO_FLUSH); |
| 252 | } |
| 253 | |
| 254 | if (err != Z_OK) { |
| 255 | m_lasterror = wxSTREAM_WRITE_ERROR; |
| 256 | wxLogError(_("Can't write to deflate stream (zlib error %d)."), err); |
| 257 | } |
| 258 | |
| 259 | size -= m_deflate->avail_in; |
| 260 | m_pos += size; |
| 261 | return size; |
| 262 | } |
| 263 | |
| 264 | #endif |
| 265 | // wxUSE_ZLIB && wxUSE_STREAMS |
| 266 | |