mirror of
https://github.com/kevinbentley/Descent3.git
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150 lines
4.0 KiB
C++
150 lines
4.0 KiB
C++
/*
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* Descent 3
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* Copyright (C) 2024 Parallax Software
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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--- HISTORICAL COMMENTS FOLLOW ---
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* $Logfile: /DescentIII/Main/Lib/unzip.h $
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* $Revision: 3 $
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* $Date: 8/15/99 8:07p $
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* $Author: Jeff $
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*
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* Unzip class
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*
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* $Log: /DescentIII/Main/Lib/unzip.h $
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*
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* 3 8/15/99 8:07p Jeff
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* handle disk write errors when extracting
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*
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* 2 8/13/99 8:01p Jeff
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* initial creation of zip class
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*
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* $NoKeywords: $
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*/
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#ifndef UNZIP_H
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#define UNZIP_H
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#include <cstdint>
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#include <cstdio>
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struct zipentry {
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uint32_t cent_file_header_sig;
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uint8_t version_made_by;
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uint8_t host_os;
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uint8_t version_needed_to_extract;
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uint8_t os_needed_to_extract;
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uint16_t general_purpose_bit_flag;
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uint16_t compression_method;
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uint16_t last_mod_file_time;
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uint16_t last_mod_file_date;
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uint32_t crc32;
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uint32_t compressed_size;
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uint32_t uncompressed_size;
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uint16_t filename_length;
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uint16_t extra_field_length;
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uint16_t file_comment_length;
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uint16_t disk_number_start;
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uint16_t internal_file_attrib;
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uint32_t external_file_attrib;
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uint32_t offset_lcl_hdr_frm_frst_disk;
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char *name;
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};
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class ZIP {
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public:
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// constructor/destructor
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ZIP();
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~ZIP();
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public:
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// opens a zip file for reading
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// returns true on success
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bool OpenZip(const char *path);
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// closes an open zip file
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void CloseZip();
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// Reads the current zip entry from the zip file (and moves
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// to the next entry). Returns NULL if there are no more entries
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zipentry *ReadNextZipEntry();
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// Resets a ZIP file to the first entry
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void Rewind();
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// Reads a file from the given zip entry into a buffer in memory
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// -1 : no ZIP file open
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// -2 : corrupt file
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// -3 : Version too new
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// -4 : OS not supported
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// -5 : No Disk Spanning
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// -6 : Error inflating
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// -7 : Compression Type Not Supported
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int ReadFile(zipentry *ent, char *data);
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// Extracts a file from the given zip entry into another file
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// -1 : no ZIP file open
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// -2 : corrupt file
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// -3 : Version too new
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// -4 : OS not supported
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// -5 : No Disk Spanning
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// -6 : Error inflating
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// -7 : Compression Type Not Supported
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// -8 : Unable to open output
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// -9 : Error writing to file
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int ExtractFile(zipentry *ent, const char *filename);
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private:
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bool FindECDSignature(char *buffer, int buflen, int *offset);
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int ReadECD();
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int ReadZipData(zipentry *ent, char *data);
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int ReadZipDataToFile(zipentry *ent, FILE *file);
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int SeekToCompressedData(zipentry *ent);
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int InflateFile(FILE *in_file, unsigned in_size, uint8_t *out_data, unsigned out_size);
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int InflateFileToFile(FILE *in_file, unsigned in_size, FILE *file, unsigned out_size);
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private:
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bool m_open;
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char *m_zip; // zip name
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FILE *m_fp; // zip handler
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int32_t m_length; // length of zip file
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char *m_ecd; // end_of_cent_dir data
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unsigned m_ecd_length; // end_of_cent_dir length
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char *m_cd; // cent_dir data
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unsigned m_cd_pos; // position in cent_dir
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zipentry m_ent; // buffer for readzip
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// end_of_cent_dir
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uint32_t m_end_of_cent_dir_sig;
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uint16_t m_number_of_this_disk;
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uint16_t m_number_of_disk_start_cent_dir;
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uint16_t m_total_entries_cent_dir_this_disk;
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uint16_t m_total_entries_cent_dir;
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uint32_t m_size_of_cent_dir;
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uint32_t m_offset_to_start_of_cent_dir;
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uint16_t m_zipfile_comment_length;
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char *m_zipfile_comment; // pointer in ecd
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};
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// Compare two filename without using directory
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int CompareZipFileName(const char *zipfile, const char *file);
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#endif
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