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668 lines
17 KiB
C
668 lines
17 KiB
C
/*
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* LZ Decompression functions
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*
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* Copyright 1996 Marcus Meissner
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*/
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/*
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* FIXME: return values might be wrong
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*/
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#include "config.h"
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#include <string.h>
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#include <ctype.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "winbase.h"
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#include "lzexpand.h"
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#include "wine/unicode.h"
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#include "wine/winbase16.h"
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#include "debugtools.h"
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DEFAULT_DEBUG_CHANNEL(file);
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/* The readahead length of the decompressor. Reading single bytes
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* using _lread() would be SLOW.
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*/
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#define GETLEN 2048
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/* Format of first 14 byte of LZ compressed file */
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struct lzfileheader {
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BYTE magic[8];
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BYTE compressiontype;
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CHAR lastchar;
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DWORD reallength;
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};
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static BYTE LZMagic[8]={'S','Z','D','D',0x88,0xf0,0x27,0x33};
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struct lzstate {
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HFILE realfd; /* the real filedescriptor */
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CHAR lastchar; /* the last char of the filename */
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DWORD reallength; /* the decompressed length of the file */
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DWORD realcurrent; /* the position the decompressor currently is */
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DWORD realwanted; /* the position the user wants to read from */
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BYTE table[0x1000]; /* the rotating LZ table */
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UINT curtabent; /* CURrent TABle ENTry */
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BYTE stringlen; /* length and position of current string */
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DWORD stringpos; /* from stringtable */
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WORD bytetype; /* bitmask within blocks */
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BYTE *get; /* GETLEN bytes */
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DWORD getcur; /* current read */
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DWORD getlen; /* length last got */
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};
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#define MAX_LZSTATES 16
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static struct lzstate *lzstates[MAX_LZSTATES];
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#define IS_LZ_HANDLE(h) (((h) >= 0x400) && ((h) < 0x400+MAX_LZSTATES))
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#define GET_LZ_STATE(h) (IS_LZ_HANDLE(h) ? lzstates[(h)-0x400] : NULL)
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/* reads one compressed byte, including buffering */
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#define GET(lzs,b) _lzget(lzs,&b)
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#define GET_FLUSH(lzs) lzs->getcur=lzs->getlen;
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static int
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_lzget(struct lzstate *lzs,BYTE *b) {
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if (lzs->getcur<lzs->getlen) {
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*b = lzs->get[lzs->getcur++];
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return 1;
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} else {
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int ret = _lread(lzs->realfd,lzs->get,GETLEN);
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if (ret==HFILE_ERROR)
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return HFILE_ERROR;
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if (ret==0)
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return 0;
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lzs->getlen = ret;
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lzs->getcur = 1;
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*b = *(lzs->get);
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return 1;
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}
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}
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/* internal function, reads lzheader
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* returns BADINHANDLE for non filedescriptors
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* return 0 for file not compressed using LZ
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* return UNKNOWNALG for unknown algorithm
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* returns lzfileheader in *head
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*/
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static INT read_header(HFILE fd,struct lzfileheader *head)
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{
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BYTE buf[14];
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if (_llseek(fd,0,SEEK_SET)==-1)
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return LZERROR_BADINHANDLE;
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/* We can't directly read the lzfileheader struct due to
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* structure element alignment
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*/
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if (_lread(fd,buf,14)<14)
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return 0;
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memcpy(head->magic,buf,8);
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memcpy(&(head->compressiontype),buf+8,1);
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memcpy(&(head->lastchar),buf+9,1);
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/* FIXME: consider endianess on non-intel architectures */
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memcpy(&(head->reallength),buf+10,4);
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if (memcmp(head->magic,LZMagic,8))
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return 0;
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if (head->compressiontype!='A')
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return LZERROR_UNKNOWNALG;
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return 1;
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}
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/***********************************************************************
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* LZStart (LZEXPAND.7)
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*/
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INT16 WINAPI LZStart16(void)
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{
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TRACE("(void)\n");
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return 1;
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}
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/***********************************************************************
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* LZStart (LZ32.@)
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*/
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INT WINAPI LZStart(void)
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{
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TRACE("(void)\n");
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return 1;
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}
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/***********************************************************************
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* LZInit (LZEXPAND.3)
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*/
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HFILE16 WINAPI LZInit16( HFILE16 hfSrc )
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{
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HFILE ret = LZInit( DosFileHandleToWin32Handle(hfSrc) );
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if (IS_LZ_HANDLE(ret)) return ret;
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if ((INT)ret <= 0) return ret;
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return hfSrc;
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}
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/***********************************************************************
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* LZInit (LZ32.@)
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*
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* initializes internal decompression buffers, returns lzfiledescriptor.
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* (return value the same as hfSrc, if hfSrc is not compressed)
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* on failure, returns error code <0
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* lzfiledescriptors range from 0x400 to 0x410 (only 16 open files per process)
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*
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* since _llseek uses the same types as libc.lseek, we just use the macros of
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* libc
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*/
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HFILE WINAPI LZInit( HFILE hfSrc )
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{
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struct lzfileheader head;
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struct lzstate *lzs;
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DWORD ret;
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int i;
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TRACE("(%d)\n",hfSrc);
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ret=read_header(hfSrc,&head);
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if (ret<=0) {
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_llseek(hfSrc,0,SEEK_SET);
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return ret?ret:hfSrc;
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}
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for (i = 0; i < MAX_LZSTATES; i++) if (!lzstates[i]) break;
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if (i == MAX_LZSTATES) return LZERROR_GLOBALLOC;
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lzstates[i] = lzs = HeapAlloc( GetProcessHeap(), 0, sizeof(struct lzstate) );
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if(lzs == NULL) return LZERROR_GLOBALLOC;
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memset(lzs,'\0',sizeof(*lzs));
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lzs->realfd = hfSrc;
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lzs->lastchar = head.lastchar;
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lzs->reallength = head.reallength;
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lzs->get = HeapAlloc( GetProcessHeap(), 0, GETLEN );
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lzs->getlen = 0;
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lzs->getcur = 0;
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if(lzs->get == NULL) {
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HeapFree(GetProcessHeap(), 0, lzs);
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lzstates[i] = NULL;
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return LZERROR_GLOBALLOC;
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}
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/* Yes, preinitialize with spaces */
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memset(lzs->table,' ',0x1000);
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/* Yes, start 16 byte from the END of the table */
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lzs->curtabent = 0xff0;
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return 0x400 + i;
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}
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/***********************************************************************
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* LZDone (LZEXPAND.9)
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* LZDone (LZ32.@)
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*/
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void WINAPI LZDone(void)
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{
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TRACE("(void)\n");
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}
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/***********************************************************************
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* GetExpandedName (LZEXPAND.10)
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*/
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INT16 WINAPI GetExpandedName16( LPCSTR in, LPSTR out )
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{
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return (INT16)GetExpandedNameA( in, out );
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}
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/***********************************************************************
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* GetExpandedNameA (LZ32.@)
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*
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* gets the full filename of the compressed file 'in' by opening it
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* and reading the header
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*
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* "file." is being translated to "file"
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* "file.bl_" (with lastchar 'a') is being translated to "file.bla"
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* "FILE.BL_" (with lastchar 'a') is being translated to "FILE.BLA"
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*/
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INT WINAPI GetExpandedNameA( LPCSTR in, LPSTR out )
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{
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struct lzfileheader head;
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HFILE fd;
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OFSTRUCT ofs;
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INT fnislowercased,ret,len;
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LPSTR s,t;
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TRACE("(%s)\n",in);
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fd=OpenFile(in,&ofs,OF_READ);
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if (fd==HFILE_ERROR)
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return (INT)(INT16)LZERROR_BADINHANDLE;
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strcpy(out,in);
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ret=read_header(fd,&head);
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if (ret<=0) {
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/* not a LZ compressed file, so the expanded name is the same
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* as the input name */
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_lclose(fd);
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return 1;
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}
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/* look for directory prefix and skip it. */
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s=out;
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while (NULL!=(t=strpbrk(s,"/\\:")))
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s=t+1;
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/* now mangle the basename */
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if (!*s) {
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/* FIXME: hmm. shouldn't happen? */
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WARN("Specified a directory or what? (%s)\n",in);
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_lclose(fd);
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return 1;
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}
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/* see if we should use lowercase or uppercase on the last char */
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fnislowercased=1;
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t=s+strlen(s)-1;
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while (t>=out) {
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if (!isalpha(*t)) {
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t--;
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continue;
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}
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fnislowercased=islower(*t);
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break;
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}
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if (isalpha(head.lastchar)) {
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if (fnislowercased)
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head.lastchar=tolower(head.lastchar);
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else
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head.lastchar=toupper(head.lastchar);
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}
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/* now look where to replace the last character */
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if (NULL!=(t=strchr(s,'.'))) {
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if (t[1]=='\0') {
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t[0]='\0';
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} else {
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len=strlen(t)-1;
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if (t[len]=='_')
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t[len]=head.lastchar;
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}
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} /* else no modification necessary */
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_lclose(fd);
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return 1;
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}
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/***********************************************************************
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* GetExpandedNameW (LZ32.@)
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*/
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INT WINAPI GetExpandedNameW( LPCWSTR in, LPWSTR out )
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{
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INT ret;
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DWORD len = WideCharToMultiByte( CP_ACP, 0, in, -1, NULL, 0, NULL, NULL );
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char *xin = HeapAlloc( GetProcessHeap(), 0, len );
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char *xout = HeapAlloc( GetProcessHeap(), 0, len+3 );
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WideCharToMultiByte( CP_ACP, 0, in, -1, xin, len, NULL, NULL );
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if ((ret = GetExpandedNameA( xin, xout )) > 0)
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MultiByteToWideChar( CP_ACP, 0, xout, -1, out, strlenW(in)+4 );
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HeapFree( GetProcessHeap(), 0, xin );
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HeapFree( GetProcessHeap(), 0, xout );
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return ret;
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}
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/***********************************************************************
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* LZRead (LZEXPAND.5)
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*/
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INT16 WINAPI LZRead16( HFILE16 fd, LPVOID buf, UINT16 toread )
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{
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if (IS_LZ_HANDLE(fd)) return LZRead( fd, buf, toread );
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return _lread( DosFileHandleToWin32Handle(fd), buf, toread );
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}
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/***********************************************************************
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* LZRead (LZ32.@)
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*/
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INT WINAPI LZRead( HFILE fd, LPVOID vbuf, UINT toread )
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{
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int howmuch;
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BYTE b,*buf;
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struct lzstate *lzs;
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buf=(LPBYTE)vbuf;
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TRACE("(%d,%p,%d)\n",fd,buf,toread);
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howmuch=toread;
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if (!(lzs = GET_LZ_STATE(fd))) return _lread(fd,buf,toread);
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/* The decompressor itself is in a define, cause we need it twice
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* in this function. (the decompressed byte will be in b)
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*/
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#define DECOMPRESS_ONE_BYTE \
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if (lzs->stringlen) { \
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b = lzs->table[lzs->stringpos]; \
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lzs->stringpos = (lzs->stringpos+1)&0xFFF; \
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lzs->stringlen--; \
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} else { \
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if (!(lzs->bytetype&0x100)) { \
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if (1!=GET(lzs,b)) \
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return toread-howmuch; \
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lzs->bytetype = b|0xFF00; \
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} \
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if (lzs->bytetype & 1) { \
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if (1!=GET(lzs,b)) \
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return toread-howmuch; \
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} else { \
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BYTE b1,b2; \
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\
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if (1!=GET(lzs,b1)) \
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return toread-howmuch; \
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if (1!=GET(lzs,b2)) \
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return toread-howmuch; \
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/* Format: \
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* b1 b2 \
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* AB CD \
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* where CAB is the stringoffset in the table\
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* and D+3 is the len of the string \
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*/ \
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lzs->stringpos = b1|((b2&0xf0)<<4); \
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lzs->stringlen = (b2&0xf)+2; \
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/* 3, but we use a byte already below ... */\
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b = lzs->table[lzs->stringpos];\
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lzs->stringpos = (lzs->stringpos+1)&0xFFF;\
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} \
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lzs->bytetype>>=1; \
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} \
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/* store b in table */ \
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lzs->table[lzs->curtabent++]= b; \
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lzs->curtabent &= 0xFFF; \
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lzs->realcurrent++;
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/* if someone has seeked, we have to bring the decompressor
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* to that position
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*/
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if (lzs->realcurrent!=lzs->realwanted) {
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/* if the wanted position is before the current position
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* I see no easy way to unroll ... We have to restart at
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* the beginning. *sigh*
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*/
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if (lzs->realcurrent>lzs->realwanted) {
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/* flush decompressor state */
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_llseek(lzs->realfd,14,SEEK_SET);
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GET_FLUSH(lzs);
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lzs->realcurrent= 0;
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lzs->bytetype = 0;
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lzs->stringlen = 0;
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memset(lzs->table,' ',0x1000);
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lzs->curtabent = 0xFF0;
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}
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while (lzs->realcurrent<lzs->realwanted) {
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DECOMPRESS_ONE_BYTE;
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}
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}
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while (howmuch) {
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DECOMPRESS_ONE_BYTE;
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lzs->realwanted++;
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*buf++ = b;
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howmuch--;
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}
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return toread;
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#undef DECOMPRESS_ONE_BYTE
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}
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/***********************************************************************
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* LZSeek (LZEXPAND.4)
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*/
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LONG WINAPI LZSeek16( HFILE16 fd, LONG off, INT16 type )
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{
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if (IS_LZ_HANDLE(fd)) return LZSeek( fd, off, type );
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return _llseek( DosFileHandleToWin32Handle(fd), off, type );
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}
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/***********************************************************************
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* LZSeek (LZ32.@)
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*/
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LONG WINAPI LZSeek( HFILE fd, LONG off, INT type )
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{
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struct lzstate *lzs;
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LONG newwanted;
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TRACE("(%d,%ld,%d)\n",fd,off,type);
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/* not compressed? just use normal _llseek() */
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if (!(lzs = GET_LZ_STATE(fd))) return _llseek(fd,off,type);
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newwanted = lzs->realwanted;
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switch (type) {
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case 1: /* SEEK_CUR */
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newwanted += off;
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break;
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case 2: /* SEEK_END */
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newwanted = lzs->reallength-off;
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break;
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default:/* SEEK_SET */
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newwanted = off;
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break;
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}
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if (newwanted>lzs->reallength)
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return LZERROR_BADVALUE;
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if (newwanted<0)
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return LZERROR_BADVALUE;
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lzs->realwanted = newwanted;
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return newwanted;
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}
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/***********************************************************************
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* LZCopy (LZEXPAND.1)
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*
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*/
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LONG WINAPI LZCopy16( HFILE16 src, HFILE16 dest )
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{
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/* already a LZ handle? */
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if (IS_LZ_HANDLE(src)) return LZCopy( src, DosFileHandleToWin32Handle(dest) );
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/* no, try to open one */
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src = LZInit16(src);
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if ((INT16)src <= 0) return 0;
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if (IS_LZ_HANDLE(src))
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{
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LONG ret = LZCopy( src, DosFileHandleToWin32Handle(dest) );
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LZClose( src );
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return ret;
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}
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/* it was not a compressed file */
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return LZCopy( DosFileHandleToWin32Handle(src), DosFileHandleToWin32Handle(dest) );
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}
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/***********************************************************************
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* LZCopy (LZ32.@)
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*
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* Copies everything from src to dest
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* if src is a LZ compressed file, it will be uncompressed.
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* will return the number of bytes written to dest or errors.
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*/
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LONG WINAPI LZCopy( HFILE src, HFILE dest )
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{
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int usedlzinit=0,ret,wret;
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LONG len;
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HFILE oldsrc = src;
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#define BUFLEN 1000
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BYTE buf[BUFLEN];
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/* we need that weird typedef, for i can't seem to get function pointer
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* casts right. (Or they probably just do not like WINAPI in general)
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*/
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typedef UINT (WINAPI *_readfun)(HFILE,LPVOID,UINT);
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_readfun xread;
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TRACE("(%d,%d)\n",src,dest);
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if (!IS_LZ_HANDLE(src)) {
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src = LZInit(src);
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if ((INT)src <= 0) return 0;
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if (src != oldsrc) usedlzinit=1;
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}
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/* not compressed? just copy */
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if (!IS_LZ_HANDLE(src))
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xread=_lread;
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else
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xread=(_readfun)LZRead;
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len=0;
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while (1) {
|
|
ret=xread(src,buf,BUFLEN);
|
|
if (ret<=0) {
|
|
if (ret==0)
|
|
break;
|
|
if (ret==-1)
|
|
return LZERROR_READ;
|
|
return ret;
|
|
}
|
|
len += ret;
|
|
wret = _lwrite(dest,buf,ret);
|
|
if (wret!=ret)
|
|
return LZERROR_WRITE;
|
|
}
|
|
if (usedlzinit)
|
|
LZClose(src);
|
|
return len;
|
|
#undef BUFLEN
|
|
}
|
|
|
|
/* reverses GetExpandedPathname */
|
|
static LPSTR LZEXPAND_MangleName( LPCSTR fn )
|
|
{
|
|
char *p;
|
|
char *mfn = (char *)HeapAlloc( GetProcessHeap(), 0,
|
|
strlen(fn) + 3 ); /* "._" and \0 */
|
|
if(mfn == NULL) return NULL;
|
|
strcpy( mfn, fn );
|
|
if (!(p = strrchr( mfn, '\\' ))) p = mfn;
|
|
if ((p = strchr( p, '.' )))
|
|
{
|
|
p++;
|
|
if (strlen(p) < 3) strcat( p, "_" ); /* append '_' */
|
|
else p[strlen(p)-1] = '_'; /* replace last character */
|
|
}
|
|
else strcat( mfn, "._" ); /* append "._" */
|
|
return mfn;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* LZOpenFile (LZEXPAND.2)
|
|
*/
|
|
HFILE16 WINAPI LZOpenFile16( LPCSTR fn, LPOFSTRUCT ofs, UINT16 mode )
|
|
{
|
|
HFILE hfret = LZOpenFileA( fn, ofs, mode );
|
|
/* return errors and LZ handles unmodified */
|
|
if ((INT)hfret <= 0) return hfret;
|
|
if (IS_LZ_HANDLE(hfret)) return hfret;
|
|
/* but allocate a dos handle for 'normal' files */
|
|
return Win32HandleToDosFileHandle(hfret);
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* LZOpenFileA (LZ32.@)
|
|
*
|
|
* Opens a file. If not compressed, open it as a normal file.
|
|
*/
|
|
HFILE WINAPI LZOpenFileA( LPCSTR fn, LPOFSTRUCT ofs, UINT mode )
|
|
{
|
|
HFILE fd,cfd;
|
|
|
|
TRACE("(%s,%p,%d)\n",fn,ofs,mode);
|
|
/* 0x70 represents all OF_SHARE_* flags, ignore them for the check */
|
|
fd=OpenFile(fn,ofs,mode);
|
|
if (fd==HFILE_ERROR)
|
|
{
|
|
LPSTR mfn = LZEXPAND_MangleName(fn);
|
|
fd = OpenFile(mfn,ofs,mode);
|
|
HeapFree( GetProcessHeap(), 0, mfn );
|
|
}
|
|
if ((mode&~0x70)!=OF_READ)
|
|
return fd;
|
|
if (fd==HFILE_ERROR)
|
|
return HFILE_ERROR;
|
|
cfd=LZInit(fd);
|
|
if ((INT)cfd <= 0) return fd;
|
|
return cfd;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* LZOpenFileW (LZ32.@)
|
|
*/
|
|
HFILE WINAPI LZOpenFileW( LPCWSTR fn, LPOFSTRUCT ofs, UINT mode )
|
|
{
|
|
HFILE ret;
|
|
DWORD len = WideCharToMultiByte( CP_ACP, 0, fn, -1, NULL, 0, NULL, NULL );
|
|
LPSTR xfn = HeapAlloc( GetProcessHeap(), 0, len );
|
|
WideCharToMultiByte( CP_ACP, 0, fn, -1, xfn, len, NULL, NULL );
|
|
ret = LZOpenFileA(xfn,ofs,mode);
|
|
HeapFree( GetProcessHeap(), 0, xfn );
|
|
return ret;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* LZClose (LZEXPAND.6)
|
|
*/
|
|
void WINAPI LZClose16( HFILE16 fd )
|
|
{
|
|
if (IS_LZ_HANDLE(fd)) LZClose( fd );
|
|
else DisposeLZ32Handle( DosFileHandleToWin32Handle(fd) );
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* LZClose (LZ32.@)
|
|
*/
|
|
void WINAPI LZClose( HFILE fd )
|
|
{
|
|
struct lzstate *lzs;
|
|
|
|
TRACE("(%d)\n",fd);
|
|
if (!(lzs = GET_LZ_STATE(fd))) _lclose(fd);
|
|
else
|
|
{
|
|
if (lzs->get) HeapFree( GetProcessHeap(), 0, lzs->get );
|
|
CloseHandle(lzs->realfd);
|
|
lzstates[fd - 0x400] = NULL;
|
|
HeapFree( GetProcessHeap(), 0, lzs );
|
|
}
|
|
}
|
|
|
|
/***********************************************************************
|
|
* CopyLZFile (LZEXPAND.8)
|
|
*/
|
|
LONG WINAPI CopyLZFile16( HFILE16 src, HFILE16 dest )
|
|
{
|
|
TRACE("(%d,%d)\n",src,dest);
|
|
return LZCopy16(src,dest);
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* CopyLZFile (LZ32.@)
|
|
*
|
|
* Copy src to dest (including uncompressing src).
|
|
* NOTE: Yes. This is exactly the same function as LZCopy.
|
|
*/
|
|
LONG WINAPI CopyLZFile( HFILE src, HFILE dest )
|
|
{
|
|
TRACE("(%d,%d)\n",src,dest);
|
|
return LZCopy(src,dest);
|
|
}
|