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kernel32: Replace magic numbers with descriptive defines.

This commit is contained in:
James Hawkins 2006-11-17 18:13:03 -08:00 committed by Alexandre Julliard
parent a07dceb002
commit 15fd7a028f
1 changed files with 23 additions and 17 deletions
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40
dlls/kernel32/lzexpand.c
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@ -58,14 +58,19 @@ WINE_DEFAULT_DEBUG_CHANNEL(file);
*/ */
#define GETLEN 2048 #define GETLEN 2048
#define LZ_MAGIC_LEN 8
#define LZ_HEADER_LEN 14
/* Format of first 14 byte of LZ compressed file */ /* Format of first 14 byte of LZ compressed file */
struct lzfileheader { struct lzfileheader {
BYTE magic[8]; BYTE magic[LZ_MAGIC_LEN];
BYTE compressiontype; BYTE compressiontype;
CHAR lastchar; CHAR lastchar;
DWORD reallength; DWORD reallength;
}; };
static BYTE LZMagic[8]={'S','Z','D','D',0x88,0xf0,0x27,0x33}; static BYTE LZMagic[LZ_MAGIC_LEN]={'S','Z','D','D',0x88,0xf0,0x27,0x33};
#define LZ_TABLE_SIZE 0x1000
struct lzstate { struct lzstate {
HFILE realfd; /* the real filedescriptor */ HFILE realfd; /* the real filedescriptor */
@ -75,7 +80,7 @@ struct lzstate {
DWORD realcurrent; /* the position the decompressor currently is */ DWORD realcurrent; /* the position the decompressor currently is */
DWORD realwanted; /* the position the user wants to read from */ DWORD realwanted; /* the position the user wants to read from */
BYTE table[0x1000]; /* the rotating LZ table */ BYTE table[LZ_TABLE_SIZE]; /* the rotating LZ table */
UINT curtabent; /* CURrent TABle ENTry */ UINT curtabent; /* CURrent TABle ENTry */
BYTE stringlen; /* length and position of current string */ BYTE stringlen; /* length and position of current string */
@ -92,8 +97,9 @@ struct lzstate {
#define MAX_LZSTATES 16 #define MAX_LZSTATES 16
static struct lzstate *lzstates[MAX_LZSTATES]; static struct lzstate *lzstates[MAX_LZSTATES];
#define IS_LZ_HANDLE(h) (((h) >= 0x400) && ((h) < 0x400+MAX_LZSTATES)) #define LZ_MIN_HANDLE 0x400
#define GET_LZ_STATE(h) (IS_LZ_HANDLE(h) ? lzstates[(h)-0x400] : NULL) #define IS_LZ_HANDLE(h) (((h) >= LZ_MIN_HANDLE) && ((h) < LZ_MIN_HANDLE+MAX_LZSTATES))
#define GET_LZ_STATE(h) (IS_LZ_HANDLE(h) ? lzstates[(h)-LZ_MIN_HANDLE] : NULL)
/* reads one compressed byte, including buffering */ /* reads one compressed byte, including buffering */
#define GET(lzs,b) _lzget(lzs,&b) #define GET(lzs,b) _lzget(lzs,&b)
@ -124,7 +130,7 @@ _lzget(struct lzstate *lzs,BYTE *b) {
*/ */
static INT read_header(HFILE fd,struct lzfileheader *head) static INT read_header(HFILE fd,struct lzfileheader *head)
{ {
BYTE buf[14]; BYTE buf[LZ_HEADER_LEN];
if (_llseek(fd,0,SEEK_SET)==-1) if (_llseek(fd,0,SEEK_SET)==-1)
return LZERROR_BADINHANDLE; return LZERROR_BADINHANDLE;
@ -132,16 +138,16 @@ static INT read_header(HFILE fd,struct lzfileheader *head)
/* We can't directly read the lzfileheader struct due to /* We can't directly read the lzfileheader struct due to
* structure element alignment * structure element alignment
*/ */
if (_lread(fd,buf,14)<14) if (_lread(fd,buf,LZ_HEADER_LEN)<LZ_HEADER_LEN)
return 0; return 0;
memcpy(head->magic,buf,8); memcpy(head->magic,buf,LZ_MAGIC_LEN);
memcpy(&(head->compressiontype),buf+8,1); memcpy(&(head->compressiontype),buf+LZ_MAGIC_LEN,1);
memcpy(&(head->lastchar),buf+9,1); memcpy(&(head->lastchar),buf+LZ_MAGIC_LEN+1,1);
/* FIXME: consider endianess on non-intel architectures */ /* FIXME: consider endianess on non-intel architectures */
memcpy(&(head->reallength),buf+10,4); memcpy(&(head->reallength),buf+LZ_MAGIC_LEN+2,4);
if (memcmp(head->magic,LZMagic,8)) if (memcmp(head->magic,LZMagic,LZ_MAGIC_LEN))
return 0; return 0;
if (head->compressiontype!='A') if (head->compressiontype!='A')
return LZERROR_UNKNOWNALG; return LZERROR_UNKNOWNALG;
@ -205,10 +211,10 @@ HFILE WINAPI LZInit( HFILE hfSrc )
} }
/* Yes, preinitialize with spaces */ /* Yes, preinitialize with spaces */
memset(lzs->table,' ',0x1000); memset(lzs->table,' ',LZ_TABLE_SIZE);
/* Yes, start 16 byte from the END of the table */ /* Yes, start 16 byte from the END of the table */
lzs->curtabent = 0xff0; lzs->curtabent = 0xff0;
return 0x400 + i; return LZ_MIN_HANDLE + i;
} }
@ -384,12 +390,12 @@ INT WINAPI LZRead( HFILE fd, LPSTR vbuf, INT toread )
*/ */
if (lzs->realcurrent>lzs->realwanted) { if (lzs->realcurrent>lzs->realwanted) {
/* flush decompressor state */ /* flush decompressor state */
_llseek(lzs->realfd,14,SEEK_SET); _llseek(lzs->realfd,LZ_HEADER_LEN,SEEK_SET);
GET_FLUSH(lzs); GET_FLUSH(lzs);
lzs->realcurrent= 0; lzs->realcurrent= 0;
lzs->bytetype = 0; lzs->bytetype = 0;
lzs->stringlen = 0; lzs->stringlen = 0;
memset(lzs->table,' ',0x1000); memset(lzs->table,' ',LZ_TABLE_SIZE);
lzs->curtabent = 0xFF0; lzs->curtabent = 0xFF0;
} }
while (lzs->realcurrent<lzs->realwanted) { while (lzs->realcurrent<lzs->realwanted) {
@ -578,7 +584,7 @@ void WINAPI LZClose( HFILE fd )
{ {
HeapFree( GetProcessHeap(), 0, lzs->get ); HeapFree( GetProcessHeap(), 0, lzs->get );
CloseHandle((HANDLE)lzs->realfd); CloseHandle((HANDLE)lzs->realfd);
lzstates[fd - 0x400] = NULL; lzstates[fd - LZ_MIN_HANDLE] = NULL;
HeapFree( GetProcessHeap(), 0, lzs ); HeapFree( GetProcessHeap(), 0, lzs );
} }
} }