| 1 | ///////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: zipstream.cpp |
| 3 | // Purpose: input stream for ZIP archive access |
| 4 | // Author: Vaclav Slavik |
| 5 | // Copyright: (c) 1999 Vaclav Slavik |
| 6 | // Licence: wxWindows Licence |
| 7 | ///////////////////////////////////////////////////////////////////////////// |
| 8 | |
| 9 | #ifdef __GNUG__ |
| 10 | #pragma implementation "zipstrm.h" |
| 11 | #endif |
| 12 | |
| 13 | // For compilers that support precompilation, includes "wx.h". |
| 14 | #include "wx/wxprec.h" |
| 15 | |
| 16 | #ifdef __BORLANDC__ |
| 17 | #pragma hdrstop |
| 18 | #endif |
| 19 | |
| 20 | #if wxUSE_STREAMS && wxUSE_ZIPSTREAM && wxUSE_ZLIB |
| 21 | |
| 22 | #include "wx/log.h" |
| 23 | #include "wx/intl.h" |
| 24 | #include "wx/stream.h" |
| 25 | #include "wx/wfstream.h" |
| 26 | #include "wx/zipstrm.h" |
| 27 | #include "wx/utils.h" |
| 28 | |
| 29 | /* Not the right solution (paths in makefiles) but... */ |
| 30 | #ifdef __BORLANDC__ |
| 31 | #include "../common/unzip.h" |
| 32 | #else |
| 33 | #include "unzip.h" |
| 34 | #endif |
| 35 | |
| 36 | |
| 37 | wxZipInputStream::wxZipInputStream(const wxString& archive, const wxString& file) : wxInputStream() |
| 38 | { |
| 39 | unz_file_info zinfo; |
| 40 | |
| 41 | m_Pos = 0; |
| 42 | m_Size = 0; |
| 43 | m_Archive = (void*) unzOpen(archive.mb_str()); |
| 44 | if (m_Archive == NULL) |
| 45 | { |
| 46 | m_lasterror = wxStream_READ_ERR; |
| 47 | return; |
| 48 | } |
| 49 | if (unzLocateFile((unzFile)m_Archive, file.mb_str(), 0) != UNZ_OK) |
| 50 | { |
| 51 | m_lasterror = wxStream_READ_ERR; |
| 52 | return; |
| 53 | } |
| 54 | |
| 55 | unzGetCurrentFileInfo((unzFile)m_Archive, &zinfo, (char*) NULL, 0, (void*) NULL, 0, (char*) NULL, 0); |
| 56 | |
| 57 | if (unzOpenCurrentFile((unzFile)m_Archive) != UNZ_OK) |
| 58 | { |
| 59 | m_lasterror = wxStream_READ_ERR; |
| 60 | return; |
| 61 | } |
| 62 | m_Size = (size_t)zinfo.uncompressed_size; |
| 63 | } |
| 64 | |
| 65 | |
| 66 | |
| 67 | wxZipInputStream::~wxZipInputStream() |
| 68 | { |
| 69 | if (m_Archive) |
| 70 | { |
| 71 | if (m_Size != 0) |
| 72 | unzCloseCurrentFile((unzFile)m_Archive); |
| 73 | unzClose((unzFile)m_Archive); |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | bool wxZipInputStream::Eof() const |
| 78 | { |
| 79 | wxASSERT_MSG( m_Pos <= (off_t)m_Size, |
| 80 | _T("wxZipInputStream: invalid current position") ); |
| 81 | |
| 82 | return m_Pos >= (off_t)m_Size; |
| 83 | } |
| 84 | |
| 85 | |
| 86 | size_t wxZipInputStream::OnSysRead(void *buffer, size_t bufsize) |
| 87 | { |
| 88 | wxASSERT_MSG( m_Pos <= (off_t)m_Size, |
| 89 | _T("wxZipInputStream: invalid current position") ); |
| 90 | |
| 91 | if ( m_Pos >= (off_t)m_Size ) |
| 92 | { |
| 93 | m_lasterror = wxStream_EOF; |
| 94 | return 0; |
| 95 | } |
| 96 | |
| 97 | if (m_Pos + bufsize > m_Size) |
| 98 | bufsize = m_Size - m_Pos; |
| 99 | |
| 100 | unzReadCurrentFile((unzFile)m_Archive, buffer, bufsize); |
| 101 | m_Pos += bufsize; |
| 102 | |
| 103 | return bufsize; |
| 104 | } |
| 105 | |
| 106 | |
| 107 | |
| 108 | off_t wxZipInputStream::OnSysSeek(off_t seek, wxSeekMode mode) |
| 109 | { |
| 110 | // NB: since ZIP files don't natively support seeking, we have to |
| 111 | // implement a brute force workaround -- reading all the data |
| 112 | // between current and the new position (or between beginning of |
| 113 | // the file and new position...) |
| 114 | |
| 115 | off_t nextpos; |
| 116 | |
| 117 | switch ( mode ) |
| 118 | { |
| 119 | case wxFromCurrent : nextpos = seek + m_Pos; break; |
| 120 | case wxFromStart : nextpos = seek; break; |
| 121 | case wxFromEnd : nextpos = m_Size - 1 + seek; break; |
| 122 | default : nextpos = m_Pos; break; /* just to fool compiler, never happens */ |
| 123 | } |
| 124 | |
| 125 | size_t toskip = 0; |
| 126 | if ( nextpos > m_Pos ) |
| 127 | { |
| 128 | toskip = nextpos - m_Pos; |
| 129 | } |
| 130 | else |
| 131 | { |
| 132 | unzCloseCurrentFile((unzFile)m_Archive); |
| 133 | if (unzOpenCurrentFile((unzFile)m_Archive) != UNZ_OK) |
| 134 | { |
| 135 | m_lasterror = wxStream_READ_ERR; |
| 136 | return m_Pos; |
| 137 | } |
| 138 | toskip = nextpos; |
| 139 | } |
| 140 | |
| 141 | if ( toskip > 0 ) |
| 142 | { |
| 143 | const size_t BUFSIZE = 4096; |
| 144 | size_t sz; |
| 145 | char buffer[BUFSIZE]; |
| 146 | while ( toskip > 0 ) |
| 147 | { |
| 148 | sz = wxMin(toskip, BUFSIZE); |
| 149 | unzReadCurrentFile((unzFile)m_Archive, buffer, sz); |
| 150 | toskip -= sz; |
| 151 | } |
| 152 | } |
| 153 | |
| 154 | m_Pos = nextpos; |
| 155 | return m_Pos; |
| 156 | } |
| 157 | |
| 158 | #endif |
| 159 | // wxUSE_STREAMS && wxUSE_ZIPSTREAM && wxUSE_ZLIB |