654 lines
19 KiB
C++
654 lines
19 KiB
C++
/**
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* =========================================================================
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* File : archive_zip.cpp
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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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#include "precompiled.h"
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#include "archive_zip.h"
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#include <time.h>
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#include <limits>
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#include "lib/bits.h"
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#include "lib/byte_order.h"
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#include "lib/fat_time.h"
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#include "lib/path_util.h"
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#include "lib/allocators/pool.h"
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#include "lib/sysdep/cpu.h" // cpu_memcpy
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#include "archive.h"
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#include "codec_zlib.h"
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#include "stream.h"
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#include "lib/file/file.h"
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#include "lib/file/file_system_posix.h"
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#include "lib/file/io/io.h"
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#include "lib/file/io/io_align.h" // BLOCK_SIZE
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#include "lib/file/io/write_buffer.h"
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static FileSystem_Posix s_fileSystemPosix;
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//-----------------------------------------------------------------------------
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// Zip archive definitions
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//-----------------------------------------------------------------------------
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static const u32 cdfh_magic = FOURCC_LE('P','K','\1','\2');
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static const u32 lfh_magic = FOURCC_LE('P','K','\3','\4');
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static const u32 ecdr_magic = FOURCC_LE('P','K','\5','\6');
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enum ZipMethod
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{
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ZIP_METHOD_NONE = 0,
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ZIP_METHOD_DEFLATE = 8
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};
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#pragma pack(push, 1)
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class LFH
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{
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public:
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void Init(const FileInfo& fileInfo, off_t csize, ZipMethod method, u32 checksum, const VfsPath& pathname_)
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{
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const std::string& pathnameString = pathname_.string();
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m_magic = lfh_magic;
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m_x1 = to_le16(0);
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m_flags = to_le16(0);
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m_method = to_le16(u16_from_larger(method));
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m_fat_mtime = to_le32(FAT_from_time_t(fileInfo.MTime()));
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m_crc = to_le32(checksum);
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m_csize = to_le32(u32_from_larger(csize));
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m_usize = to_le32(u32_from_larger(fileInfo.Size()));
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m_fn_len = to_le16(u16_from_larger(pathnameString.length()));
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m_e_len = to_le16(0);
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cpu_memcpy((char*)this + sizeof(LFH), pathnameString.c_str(), pathnameString.length());
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}
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size_t Size() const
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{
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debug_assert(m_magic == lfh_magic);
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size_t size = sizeof(LFH);
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size += read_le16(&m_fn_len);
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size += read_le16(&m_e_len);
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// note: LFH doesn't have a comment field!
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return size;
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}
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private:
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u32 m_magic;
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u16 m_x1; // version needed
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u16 m_flags;
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u16 m_method;
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u32 m_fat_mtime; // last modified time (DOS FAT format)
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u32 m_crc;
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u32 m_csize;
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u32 m_usize;
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u16 m_fn_len;
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u16 m_e_len;
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};
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cassert(sizeof(LFH) == 30);
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class CDFH
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{
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public:
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void Init(const FileInfo& fileInfo, off_t ofs, off_t csize, ZipMethod method, u32 checksum, const VfsPath& pathname_, size_t slack)
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{
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const std::string& pathnameString = pathname_.string();
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m_magic = cdfh_magic;
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m_x1 = to_le32(0);
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m_flags = to_le16(0);
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m_method = to_le16(u16_from_larger(method));
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m_fat_mtime = to_le32(FAT_from_time_t(fileInfo.MTime()));
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m_crc = to_le32(checksum);
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m_csize = to_le32(u32_from_larger(csize));
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m_usize = to_le32(u32_from_larger(fileInfo.Size()));
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m_fn_len = to_le16(u16_from_larger(pathnameString.length()));
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m_e_len = to_le16(0);
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m_c_len = to_le16(u16_from_larger((size_t)slack));
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m_x2 = to_le32(0);
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m_x3 = to_le32(0);
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m_lfh_ofs = to_le32(ofs);
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cpu_memcpy((char*)this + sizeof(CDFH), pathnameString.c_str(), pathnameString.length());
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}
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void GetPathname(std::string& pathname) const
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{
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const size_t length = (size_t)read_le16(&m_fn_len);
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const char* fn = (const char*)this + sizeof(CDFH); // not 0-terminated!
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pathname = std::string(fn, length);
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}
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off_t HeaderOffset() const
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{
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return read_le32(&m_lfh_ofs);
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}
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off_t USize() const
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{
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return (off_t)read_le32(&m_usize);
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}
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off_t CSize() const
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{
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return (off_t)read_le32(&m_csize);
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}
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ZipMethod Method() const
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{
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return (ZipMethod)read_le16(&m_method);
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}
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u32 Checksum() const
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{
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return read_le32(&m_crc);
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}
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time_t MTime() const
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{
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const u32 fat_mtime = read_le32(&m_fat_mtime);
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return time_t_from_FAT(fat_mtime);
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}
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size_t Size() const
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{
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size_t size = sizeof(CDFH);
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size += read_le16(&m_fn_len);
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size += read_le16(&m_e_len);
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size += read_le16(&m_c_len);
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return size;
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}
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private:
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u32 m_magic;
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u32 m_x1; // versions
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u16 m_flags;
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u16 m_method;
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u32 m_fat_mtime; // last modified time (DOS FAT format)
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u32 m_crc;
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u32 m_csize;
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u32 m_usize;
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u16 m_fn_len;
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u16 m_e_len;
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u16 m_c_len;
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u32 m_x2; // spanning
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u32 m_x3; // attributes
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u32 m_lfh_ofs;
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};
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cassert(sizeof(CDFH) == 46);
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class ECDR
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{
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public:
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void Init(size_t cd_numEntries, off_t cd_ofs, off_t cd_size)
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{
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m_magic = ecdr_magic;
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m_diskNum = to_le16(0);
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m_cd_diskNum = to_le16(0);
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m_cd_numEntriesOnDisk = to_le16(u16_from_larger(cd_numEntries));
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m_cd_numEntries = m_cd_numEntriesOnDisk;
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m_cd_size = to_le32(u32_from_larger(cd_size));
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m_cd_ofs = to_le32(u32_from_larger(cd_ofs));
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m_comment_len = to_le16(0);
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}
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void Decompose(size_t& cd_numEntries, off_t& cd_ofs, off_t& cd_size) const
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{
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cd_numEntries = (size_t)read_le16(&m_cd_numEntries);
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cd_ofs = (off_t)read_le32(&m_cd_ofs);
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cd_size = (off_t)read_le32(&m_cd_size);
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}
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private:
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u32 m_magic;
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u16 m_diskNum;
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u16 m_cd_diskNum;
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u16 m_cd_numEntriesOnDisk;
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u16 m_cd_numEntries;
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u32 m_cd_size;
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u32 m_cd_ofs;
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u16 m_comment_len;
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};
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cassert(sizeof(ECDR) == 22);
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#pragma pack(pop)
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//-----------------------------------------------------------------------------
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// ArchiveFile_Zip
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//-----------------------------------------------------------------------------
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class ArchiveFile_Zip : public IArchiveFile
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{
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public:
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ArchiveFile_Zip(const PIFile& file, off_t ofs, off_t csize, u32 checksum, ZipMethod method)
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: m_file(file), m_ofs(ofs)
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, m_csize(csize), m_checksum(checksum), m_method((u16)method)
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, m_flags(NeedsFixup)
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{
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}
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virtual size_t Precedence() const
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{
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return 2u;
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}
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virtual char LocationCode() const
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{
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return 'A';
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}
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virtual LibError Load(const std::string& UNUSED(name), const shared_ptr<u8>& buf, size_t size) const
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{
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AdjustOffset();
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PICodec codec;
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switch(m_method)
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{
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case ZIP_METHOD_NONE:
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codec = CreateCodec_ZLibNone();
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break;
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case ZIP_METHOD_DEFLATE:
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codec = CreateDecompressor_ZLibDeflate();
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break;
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default:
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WARN_RETURN(ERR::ARCHIVE_UNKNOWN_METHOD);
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}
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Stream stream(codec);
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stream.SetOutputBuffer(buf.get(), size);
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RETURN_ERR(io_Scan(m_file, m_ofs, m_csize, FeedStream, (uintptr_t)&stream));
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RETURN_ERR(stream.Finish());
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#if CODEC_COMPUTE_CHECKSUM
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debug_assert(m_checksum == stream.Checksum());
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#endif
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return INFO::OK;
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}
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private:
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enum Flags
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{
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// indicates m_ofs points to a "local file header" instead of
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// the file data. a fixup routine is called when reading the file;
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// it skips past the LFH and clears this flag.
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// this is somewhat of a hack, but vital to archive open performance.
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// without it, we'd have to scan through the entire archive file,
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// which can take *seconds*.
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// (we cannot use the information in CDFH, because its 'extra' field
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// has been observed to differ from that of the LFH)
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// since we read the LFH right before the rest of the file, the block
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// cache will absorb the IO cost.
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NeedsFixup = 1
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};
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struct LFH_Copier
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{
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u8* lfh_dst;
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size_t lfh_bytes_remaining;
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};
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// this code grabs an LFH struct from file block(s) that are
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// passed to the callback. usually, one call copies the whole thing,
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// but the LFH may straddle a block boundary.
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//
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// rationale: this allows using temp buffers for zip_fixup_lfh,
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// which avoids involving the file buffer manager and thus
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// avoids cluttering the trace and cache contents.
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static LibError lfh_copier_cb(uintptr_t cbData, const u8* block, size_t size)
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{
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LFH_Copier* p = (LFH_Copier*)cbData;
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debug_assert(size <= p->lfh_bytes_remaining);
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cpu_memcpy(p->lfh_dst, block, size);
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p->lfh_dst += size;
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p->lfh_bytes_remaining -= size;
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return INFO::CB_CONTINUE;
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}
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/**
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* fix up m_ofs (adjust it to point to cdata instead of the LFH).
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*
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* note: we cannot use CDFH filename and extra field lengths to skip
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* 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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**/
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void AdjustOffset() const
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{
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if(!(m_flags & NeedsFixup))
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return;
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m_flags &= ~NeedsFixup;
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// performance note: this ends up reading one file block, which is
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// only in the block cache if the file starts in the same block as a
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// previously read file (i.e. both are small).
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LFH lfh;
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LFH_Copier params = { (u8*)&lfh, sizeof(LFH) };
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if(io_Scan(m_file, m_ofs, sizeof(LFH), lfh_copier_cb, (uintptr_t)¶ms) == INFO::OK)
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m_ofs += (off_t)lfh.Size();
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}
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PIFile m_file;
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// all relevant LFH/CDFH fields not covered by FileInfo
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mutable off_t m_ofs;
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off_t m_csize;
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u32 m_checksum;
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u16 m_method;
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mutable u16 m_flags;
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};
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//-----------------------------------------------------------------------------
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// ArchiveReader_Zip
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//-----------------------------------------------------------------------------
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class ArchiveReader_Zip : public IArchiveReader
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{
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public:
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ArchiveReader_Zip(const Path& pathname)
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: m_file(CreateFile_Posix())
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{
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m_file->Open(pathname, 'r');
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FileInfo fileInfo;
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s_fileSystemPosix.GetFileInfo(pathname, &fileInfo);
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m_fileSize = fileInfo.Size();
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const size_t minFileSize = sizeof(LFH)+sizeof(CDFH)+sizeof(ECDR);
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debug_assert(m_fileSize >= off_t(minFileSize));
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}
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virtual LibError ReadEntries(ArchiveEntryCallback cb, uintptr_t cbData)
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{
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// locate and read Central Directory
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off_t cd_ofs; size_t cd_numEntries; off_t cd_size;
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RETURN_ERR(LocateCentralDirectory(m_file, m_fileSize, cd_ofs, cd_numEntries, cd_size));
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shared_ptr<u8> buf = io_Allocate(cd_size, cd_ofs);
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u8* cd;
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RETURN_ERR(io_Read(m_file, cd_ofs, buf.get(), cd_size, cd));
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// iterate over Central Directory
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const u8* pos = cd;
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for(size_t i = 0; i < cd_numEntries; i++)
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{
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// scan for next CDFH
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CDFH* cdfh = (CDFH*)FindRecord(cd, cd_size, pos, cdfh_magic, sizeof(CDFH));
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if(!cdfh)
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WARN_RETURN(ERR::CORRUPTED);
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std::string zipPathname;
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cdfh->GetPathname(zipPathname);
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const size_t lastSlashOfs = zipPathname.find_last_of('/');
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const size_t nameOfs = (lastSlashOfs == std::string::npos)? 0 : lastSlashOfs+1;
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if(nameOfs != zipPathname.length()) // ignore paths ending in slash (i.e. representing a directory)
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{
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const std::string name = zipPathname.substr(nameOfs, zipPathname.length()-nameOfs);
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FileInfo fileInfo(name, cdfh->USize(), cdfh->MTime());
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shared_ptr<ArchiveFile_Zip> archiveFile(new ArchiveFile_Zip(m_file, cdfh->HeaderOffset(), cdfh->CSize(), cdfh->Checksum(), cdfh->Method()));
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cb(zipPathname, fileInfo, archiveFile, cbData);
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}
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pos += cdfh->Size();
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}
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return INFO::OK;
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}
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private:
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/**
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* scan buffer for a Zip file record.
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*
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* @param start position within buffer
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* @param magic signature of record
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* @param recordSize size of record (including signature)
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* @return pointer to record within buffer or 0 if not found.
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**/
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static const u8* FindRecord(const u8* buf, size_t size, const u8* start, u32 magic, size_t recordSize)
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{
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// (don't use <start> as the counter - otherwise we can't tell if
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// scanning within the buffer was necessary.)
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for(const u8* p = start; p <= buf+size-recordSize; p++)
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{
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// found it
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if(*(u32*)p == magic)
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{
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debug_assert(p == start); // otherwise, the archive is a bit broken
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return p;
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}
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}
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// passed EOF, didn't find it.
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// note: do not warn - this happens in the initial ECDR search at
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// EOF if the archive contains a comment field.
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return 0;
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}
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// search for ECDR in the last <maxScanSize> bytes of the file.
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// if found, fill <dst_ecdr> with a copy of the (little-endian) ECDR and
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// return INFO::OK, otherwise IO error or ERR::CORRUPTED.
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static LibError ScanForEcdr(const PIFile& file, off_t fileSize, u8* buf, off_t maxScanSize, size_t& cd_numEntries, off_t& cd_ofs, off_t& cd_size)
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{
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// don't scan more than the entire file
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const off_t scanSize = std::min(maxScanSize, fileSize);
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// read desired chunk of file into memory
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const off_t ofs = fileSize - scanSize;
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u8* data;
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RETURN_ERR(io_Read(file, ofs, buf, scanSize, data));
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// look for ECDR in buffer
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const ECDR* ecdr = (const ECDR*)FindRecord(data, scanSize, data, ecdr_magic, sizeof(ECDR));
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if(!ecdr)
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return INFO::CANNOT_HANDLE;
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ecdr->Decompose(cd_numEntries, cd_ofs, cd_size);
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return INFO::OK;
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}
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static LibError LocateCentralDirectory(const PIFile& file, off_t fileSize, off_t& cd_ofs, size_t& cd_numEntries, off_t& cd_size)
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{
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const off_t maxScanSize = 66000u; // see below
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shared_ptr<u8> buf = io_Allocate(maxScanSize, BLOCK_SIZE-1); // assume worst-case for alignment
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// expected case: ECDR at EOF; no file comment
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LibError ret = ScanForEcdr(file, fileSize, const_cast<u8*>(buf.get()), sizeof(ECDR), cd_numEntries, cd_ofs, cd_size);
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if(ret == INFO::OK)
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return INFO::OK;
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// worst case: ECDR precedes 64 KiB of file comment
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ret = ScanForEcdr(file, fileSize, const_cast<u8*>(buf.get()), maxScanSize, cd_numEntries, cd_ofs, cd_size);
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if(ret == INFO::OK)
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return INFO::OK;
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// both ECDR scans failed - this is not a valid Zip file.
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RETURN_ERR(io_ReadAligned(file, 0, const_cast<u8*>(buf.get()), sizeof(LFH)));
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// the Zip file has an LFH but lacks an ECDR. this can happen if
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// the user hard-exits while an archive is being written.
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// notes:
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// - return ERR::CORRUPTED so VFS will not include this file.
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// - we could work around this by scanning all LFHs, but won't bother
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// because it'd be slow.
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// - do not warn - the corrupt archive will be deleted on next
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// successful archive builder run anyway.
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if(FindRecord(buf.get(), sizeof(LFH), buf.get(), lfh_magic, sizeof(LFH)))
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return ERR::CORRUPTED; // NOWARN
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// totally bogus
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else
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|
WARN_RETURN(ERR::ARCHIVE_UNKNOWN_FORMAT);
|
|
}
|
|
|
|
PIFile m_file;
|
|
off_t m_fileSize;
|
|
};
|
|
|
|
PIArchiveReader CreateArchiveReader_Zip(const Path& archivePathname)
|
|
{
|
|
return PIArchiveReader(new ArchiveReader_Zip(archivePathname));
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// ArchiveWriter_Zip
|
|
//-----------------------------------------------------------------------------
|
|
|
|
class ArchiveWriter_Zip : public IArchiveWriter
|
|
{
|
|
public:
|
|
ArchiveWriter_Zip(const Path& archivePathname)
|
|
: m_file(CreateFile_Posix()), m_fileSize(0)
|
|
, m_unalignedWriter(new UnalignedWriter(m_file, 0))
|
|
, m_numEntries(0)
|
|
{
|
|
THROW_ERR(m_file->Open(archivePathname, 'w'));
|
|
THROW_ERR(pool_create(&m_cdfhPool, 10*MiB, 0));
|
|
}
|
|
|
|
~ArchiveWriter_Zip()
|
|
{
|
|
// append an ECDR to the CDFH list (this allows us to
|
|
// write out both to the archive file in one burst)
|
|
const off_t cd_size = (off_t)m_cdfhPool.da.pos;
|
|
ECDR* ecdr = (ECDR*)pool_alloc(&m_cdfhPool, sizeof(ECDR));
|
|
if(!ecdr)
|
|
throw std::bad_alloc();
|
|
const off_t cd_ofs = m_fileSize;
|
|
ecdr->Init(m_numEntries, cd_ofs, cd_size);
|
|
|
|
m_unalignedWriter->Append(m_cdfhPool.da.base, cd_size+sizeof(ECDR));
|
|
m_unalignedWriter->Flush();
|
|
m_unalignedWriter.reset();
|
|
|
|
(void)pool_destroy(&m_cdfhPool);
|
|
|
|
const Path pathname = m_file->Pathname();
|
|
m_file.reset();
|
|
|
|
m_fileSize += cd_size+sizeof(ECDR);
|
|
truncate(pathname.external_directory_string().c_str(), m_fileSize);
|
|
}
|
|
|
|
LibError AddFile(const Path& pathname)
|
|
{
|
|
FileInfo fileInfo;
|
|
RETURN_ERR(s_fileSystemPosix.GetFileInfo(pathname, &fileInfo));
|
|
const off_t usize = fileInfo.Size();
|
|
// skip 0-length files.
|
|
// rationale: zip.cpp needs to determine whether a CDFH entry is
|
|
// a file or directory (the latter are written by some programs but
|
|
// not needed - they'd only pollute the file table).
|
|
// it looks like checking for usize=csize=0 is the safest way -
|
|
// relying on file attributes (which are system-dependent!) is
|
|
// even less safe.
|
|
// we thus skip 0-length files to avoid confusing them with directories.
|
|
if(!usize)
|
|
return INFO::SKIPPED;
|
|
|
|
PIFile file = CreateFile_Posix();
|
|
RETURN_ERR(file->Open(pathname, 'r'));
|
|
|
|
const size_t pathnameLength = pathname.string().length();
|
|
const VfsPath vfsPathname(pathname.string());
|
|
|
|
// choose method and the corresponding codec
|
|
ZipMethod method;
|
|
PICodec codec;
|
|
if(IsFileTypeIncompressible(pathname))
|
|
{
|
|
method = ZIP_METHOD_NONE;
|
|
codec = CreateCodec_ZLibNone();
|
|
}
|
|
else
|
|
{
|
|
method = ZIP_METHOD_DEFLATE;
|
|
codec = CreateCompressor_ZLibDeflate();
|
|
}
|
|
|
|
// allocate memory
|
|
const size_t csizeMax = codec->MaxOutputSize(usize);
|
|
shared_ptr<u8> buf = io_Allocate(sizeof(LFH) + pathnameLength + csizeMax);
|
|
|
|
// read and compress file contents
|
|
size_t csize; u32 checksum;
|
|
{
|
|
u8* cdata = (u8*)buf.get() + sizeof(LFH) + pathnameLength;
|
|
Stream stream(codec);
|
|
stream.SetOutputBuffer(cdata, csizeMax);
|
|
RETURN_ERR(io_Scan(file, 0, usize, FeedStream, (uintptr_t)&stream));
|
|
RETURN_ERR(stream.Finish());
|
|
csize = stream.OutSize();
|
|
checksum = stream.Checksum();
|
|
}
|
|
|
|
// build LFH
|
|
{
|
|
LFH* lfh = (LFH*)buf.get();
|
|
lfh->Init(fileInfo, (off_t)csize, method, checksum, vfsPathname);
|
|
}
|
|
|
|
// append a CDFH to the central directory (in memory)
|
|
const off_t ofs = m_fileSize;
|
|
const size_t prev_pos = m_cdfhPool.da.pos; // (required to determine padding size)
|
|
const size_t cdfhSize = sizeof(CDFH) + pathnameLength;
|
|
CDFH* cdfh = (CDFH*)pool_alloc(&m_cdfhPool, cdfhSize);
|
|
if(!cdfh)
|
|
WARN_RETURN(ERR::NO_MEM);
|
|
const size_t slack = m_cdfhPool.da.pos - prev_pos - cdfhSize;
|
|
cdfh->Init(fileInfo, ofs, (off_t)csize, method, checksum, vfsPathname, slack);
|
|
m_numEntries++;
|
|
|
|
// write LFH, pathname and cdata to file
|
|
const size_t packageSize = sizeof(LFH) + pathnameLength + csize;
|
|
RETURN_ERR(m_unalignedWriter->Append(buf.get(), (off_t)packageSize));
|
|
m_fileSize += (off_t)packageSize;
|
|
|
|
return INFO::OK;
|
|
}
|
|
|
|
private:
|
|
static bool IsFileTypeIncompressible(const Path& pathname)
|
|
{
|
|
const char* extension = path_extension(pathname.string().c_str());
|
|
|
|
// file extensions that we don't want to compress
|
|
static const char* incompressibleExtensions[] =
|
|
{
|
|
"zip", "rar",
|
|
"jpg", "jpeg", "png",
|
|
"ogg", "mp3"
|
|
};
|
|
|
|
for(size_t i = 0; i < ARRAY_SIZE(incompressibleExtensions); i++)
|
|
{
|
|
if(!strcasecmp(extension, incompressibleExtensions[i]))
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
PIFile m_file;
|
|
off_t m_fileSize;
|
|
PUnalignedWriter m_unalignedWriter;
|
|
|
|
Pool m_cdfhPool;
|
|
size_t m_numEntries;
|
|
};
|
|
|
|
PIArchiveWriter CreateArchiveWriter_Zip(const Path& archivePathname)
|
|
{
|
|
return PIArchiveWriter(new ArchiveWriter_Zip(archivePathname));
|
|
}
|