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janwas
68 lines
2.3 KiB
C
68 lines
2.3 KiB
C
/**
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* =========================================================================
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* File : zip.h
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* Project : 0 A.D.
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* Description : archive backend for Zip files.
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* =========================================================================
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*/
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// license: GPL; see lib/license.txt
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#ifndef INCLUDED_ZIP
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#define INCLUDED_ZIP
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struct File;
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struct Archive;
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struct ArchiveEntry;
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// analyse an opened Zip file; call back into archive.cpp to
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// populate the Archive object with a list of the files it contains.
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// returns INFO::OK on success, ERR::CORRUPTED if file is recognizable as
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// a Zip file but invalid, otherwise ERR::RES_UNKNOWN_FORMAT or IO error.
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//
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// fairly slow - must read Central Directory from disk
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// (size ~= 60 bytes*num_files); observed time ~= 80ms.
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extern LibError zip_populate_archive(File* f, Archive* a);
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// ensures <ent.ofs> points to the actual file contents; it is initially
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// the offset of the LFH. we cannot use CDFH filename and extra field
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// lengths to skip past LFH since that may not mirror CDFH (has happened).
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//
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// this is called at file-open time instead of while mounting to
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// reduce seeks: since reading the file will typically follow, the
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// block cache entirely absorbs the IO cost.
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extern void zip_fixup_lfh(File* f, ArchiveEntry* ent);
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//
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// archive builder backend
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//
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struct ZipArchive; // opaque
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// create a new Zip archive and return a pointer for use in subsequent
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// zip_archive_add_file calls. previous archive file is overwritten.
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extern LibError zip_archive_create(const char* zip_filename, ZipArchive** pza);
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// add a file (described by ArchiveEntry) to the archive. file_contents
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// is the actual file data; its compression method is given in ae->method and
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// can be CM_NONE.
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// IO cost: writes out <file_contents> to disk (we don't currently attempt
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// any sort of write-buffering).
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extern LibError zip_archive_add_file(ZipArchive* za, const ArchiveEntry* ae, void* file_contents);
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// write out the archive to disk; only hereafter is it valid.
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// frees the ZipArchive instance.
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// IO cost: writes out Central Directory to disk (about 70 bytes per file).
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extern LibError zip_archive_finish(ZipArchive* za);
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// for self-test
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extern time_t time_t_from_FAT(u32 fat_timedate);
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extern u32 FAT_from_time_t(time_t time);
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#endif // #ifndef INCLUDED_ZIP
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