gzip.c.svn-base

realtek的8186芯片ADSL路由AP源代码

#define EOF 0
#ifndef	NULL
#define	NULL	0
#endif	//NULL
#include "tailor.h"
#include "gzip.h"

	/* global buffers */
/*
	flush_window() :
			Do memory copy, from window to unzipDest
			
	unzipSource	:
			point to source data (zip formate)
			
	unzipDest	:
			point to dest data ( decompress formate )
			
	inbuf :	
			to sotre temp data will been decompress.
			(data copy from unzipSource)
			
	outbuf:
			
	window:
			store decompress block data
*/	
DECLARE(uch, inbuf,  INBUFSIZ);
//DECLARE(uch, outbuf, OUTBUFSIZ);
DECLARE(uch, window, WSIZE);


		/* local variables */
unsigned long unzipSource;
unsigned long unzipDest;
long unzipLength;
unsigned long unzipTotalSZ;

int	method; 				/* compression method */
int	exit_code;				/* program exit code */
long bytes_in;             /* number of input bytes */
long bytes_out;            /* number of output bytes */
unsigned insize;           /* valid bytes in inbuf */
unsigned inptr;            /* index of next byte to be processed in inbuf */
unsigned outcnt;           /* bytes in output buffer */

/* ========================================================================
 * Table of CRC-32's of all single-byte values (made by makecrc.c)
 */
ulg crc_32_tab[] = {
  0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
  0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
  0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
  0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
  0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
  0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
  0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
  0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
  0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
  0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
  0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
  0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
  0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
  0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
  0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
  0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
  0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
  0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
  0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
  0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
  0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
  0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
  0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
  0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
  0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
  0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
  0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
  0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
  0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
  0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
  0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
  0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
  0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
  0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
  0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
  0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
  0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
  0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
  0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
  0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
  0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
  0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
  0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
  0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
  0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
  0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
  0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
  0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
  0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
  0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
  0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
  0x2d02ef8dL
};


/* ===========================================================================
 * Run a set of bytes through the crc shift register.  If s is a NULL
 * pointer, then initialize the crc shift register contents instead.
 * Return the current crc in either case.
 */
ulg updcrc(s, n)
    uch GZIP_FAR *s;                 /* pointer to bytes to pump through */
    unsigned n;             /* number of bytes in s[] */
{
    register ulg c;         /* temporary variable */
    static ulg crc = (ulg)0xffffffffL; /* shift register contents */

    if (s == NULL) {	
	c = 0xffffffffL;
   } else {
	c = crc;
        if (n) do {
            c = crc_32_tab[((int)c ^ (*s++)) & 0xff] ^ (c >> 8);
        } while (--n);
    }
    crc = c;
    return c ^ 0xffffffffL;       /* (instead of ~c for 64-bit machines) */
}

/* ===========================================================================
 * Clear input and output buffers
 */
void clear_bufs()
{
    outcnt = 0;
    insize = inptr = 0;
    bytes_in = bytes_out = 0L;
}

/* ===========================================================================
 * Fill the input buffer. This is called only when the buffer is empty.
 */
int fill_inbuf(eof_ok)
    int eof_ok;          /* set if EOF acceptable as a result */
{
	//_fmemcpy((char GZIP_FAR *)inbuf, LinToSeg(unzipSource), INBUFSIZ);
	memcpy((char GZIP_FAR *)inbuf,(char GZIP_FAR *)unzipSource,INBUFSIZ);
	insize = INBUFSIZ;
//	_FP_SEG(unzipSrcP)++;
	unzipSource += (unsigned long)INBUFSIZ;

    bytes_in += (ulg)insize;
    inptr = 1;
    return inbuf[0];
}


/* ===========================================================================
 * Write the output window window[0..outcnt-1] and update crc and bytes_out.
 * (Used for the decompressed data only.)
 */
void flush_window()
{
    if (outcnt == 0) return;
    updcrc(window, outcnt);

	write_buf((char GZIP_FAR *)window, outcnt);
    bytes_out += (ulg)outcnt;
    outcnt = 0;
}


/* ===========================================================================
 * kwrite decompressed file to RAM
 */
unsigned kwrite(void GZIP_FAR *buffer, unsigned int count)
{
 	//_fmemcpy(LinToSeg(unzipDest), buffer, count);
 	unzipTotalSZ += count;
 	
 	//if (unzipDest == NULL)	return count; /* DO NOT memory copy */
 	memcpy((char *)unzipDest,(char *)buffer,count);
 	
 	
	unzipDest += (unsigned long)count;	
	
	return count;
}


/* ===========================================================================
 * Does the same as write(), but also handles partial pipe writes and checks
 * for error return.
 */
void write_buf(buf, cnt)
    void GZIP_FAR *buf;
    unsigned  cnt;
{
    unsigned  n;
    while ((n = kwrite(buf, cnt)) != cnt) {
		if (n == (unsigned)(-1)) {
//			printf("\r\nwrite error!");
//		    write_error();
		}
		cnt -= n;
		buf = (void GZIP_FAR *)((char GZIP_FAR *)buf+n);
    }
}

/* ========================================================================
 * Put string s in lower case, return s.
 */
/* 
char *strlwr(s)
    char *s;
{
    char *t;
    for (t = s; *t; t++) *t = tolower(*t);
    return s;
}
*/
/* ========================================================================
 * Error handlers.
 */
void error(m)
    char *m;
{
//    printf("\n\r: %s\n\r", m);
//    abort_gzip();
}

void warn(a, b)
    char *a, *b;            /* message strings juxtaposed in output */
{
    //WARN(("warning: %s%s\n\r", a, b));
}

/* PKZIP header definitions */
#define LOCSIG 0x04034b50L      /* four-byte lead-in (lsb first) */
#define LOCFLG 6                /* offset of bit flag */
#define  CRPFLG 1               /*  bit for encrypted entry */
#define  EXTFLG 8               /*  bit for extended local header */
#define LOCHOW 8                /* offset of compression method */
#define LOCTIM 10               /* file mod time (for decryption) */
#define LOCCRC 14               /* offset of crc */
#define LOCSIZ 18               /* offset of compressed size */
#define LOCLEN 22               /* offset of uncompressed length */
#define LOCFIL 26               /* offset of file name field length */
#define LOCEXT 28               /* offset of extra field length */
#define LOCHDR 30               /* size of local header, including sig */
#define EXTHDR 16               /* size of extended local header, inc sig */


/* for splite file */
local ulg crc;       /* crc on uncompressed file data */
///////////////////

/* ===========================================================================
 * Unzip in to out.  This routine works on both gzip and pkzip files.
 *
 * IN assertions: the buffer inbuf contains already the beginning of
 *   the compressed data, from offsets inptr to insize-1 included.
 *   The magic header has already been checked. The output buffer is cleared.
 */
int unzip(void)
{
    ulg orig_crc = 0;       /* original crc */
    ulg orig_len = 0;       /* original uncompressed length */
	ulg new_crc = 0;
    int n;
    uch buf[EXTHDR];        /* extended local header */

    //updcrc(NULL, 0);           /* initialize crc */
    updcrc(0, 0);           /* initialize crc */

	orig_crc = LG(inbuf + LOCCRC);
	orig_len = LG(inbuf + LOCLEN);

    /* Decompress */
    if (method == DEFLATED)  {
	int res = inflate();
		if (res == 3) {
		    error("out of memory");
			return GZIP_ERROR;
		} else if (res != 0) {
	    	error("invalid compressed data--format violated");
			return GZIP_ERROR;
		}
	} else {
		error("internal error, invalid method");
		return GZIP_ERROR;
    }

    /* Get the crc and original length */
	for (n = 0; n < 8; n++) {
	    buf[n] = (uch)get_byte(); /* may cause an error if EOF */
	}
	orig_crc = LG(buf);
	orig_len = LG(buf+4);


    /* Validate decompression */
	new_crc = updcrc(window, 0);
    if (orig_crc != new_crc) {
		error("invalid compressed data--crc error");
		return GZIP_ERROR;
    }
    if (orig_len != (ulg)bytes_out) {
		error("invalid compressed data--length error");
		return GZIP_ERROR;
    }
    return GZIP_OK;
}






/* local functions */
local void do_exit      OF((int exitcode));
#define strequ(s1, s2) (strcmp((s1),(s2)) == 0)

/* ========================================================================
 * Deompress the given file
 */
unsigned int decompress_file(Source, Dest, Length)
	unsigned long Source;
	unsigned long Dest;
	unsigned long Length;
{
    uch flags;     /* compression flags */
    char magic[2]; /* magic header */
    uch dummy;

	method = DEFLATED;		/* compression method */
	exit_code = GZIP_OK;   	/* program exit code */

	unzipSource = Source;
	unzipDest   = Dest;
	unzipLength = Length;
	unzipTotalSZ = 0;
    clear_bufs(); /* clear input and output buffers */

	magic[0] = (char)get_byte();
	magic[1] = (char)get_byte();

    if (memcmp(magic, GZIP_MAGIC, 2) == 0
      || memcmp(magic, OLD_GZIP_MAGIC, 2) == 0) {
		method = (int)get_byte();
		if (method != DEFLATED) {
	    	//printf(":unknown method %d\n\r", method);
	    	exit_code = GZIP_ERROR;
	    	return GZIP_ERROR;
		}
		flags = (int)get_byte();
		if ((flags & (ENCRYPTED|CONTINUATION|RESERVED)) != 0) {
	    	exit_code = GZIP_ERROR;
	    	return GZIP_ERROR;
		}

		/* ignore time stamp */
		dummy = get_byte();
		dummy = get_byte();
		dummy = get_byte();
		dummy = get_byte();

		dummy = get_byte();  /* Ignore extra flags for the moment */
		dummy = get_byte();  /* Ignore OS type for the moment */

		if ((flags & EXTRA_FIELD) != 0) {
		    unsigned len = (unsigned)get_byte();
	    	len |= ((unsigned)get_byte())<<8;
		    while (len--) (void)get_byte();
		}

		/* Get original file name if it was truncated */
		if ((flags & ORIG_NAME) != 0) {
		char c; /* dummy used for NeXTstep 3.0 cc optimizer bug */
		do {c=get_byte();} while (c != 0);
		} /* ORIG_NAME */

		/* Discard file comment if any */
		if ((flags & COMMENT) != 0) {
	    	while (get_char() != 0) /* null */ ;
		}
		
	} else {
		//printf("\r\nwrong magic");
		return GZIP_ERROR;
	}

    /* Actually do the compression/decompression. Loop over zipped members.
     */
		if (unzip() != GZIP_OK) {
		    method = -1; /* force cleanup */
			return GZIP_ERROR;
		}
//		if (inptr == insize) break;
		/* end of file */

		bytes_out = 0;            /* required for length check */
	return GZIP_OK;
}



/* ========================================================================
 * Free all dynamically allocated variables and exit with the given code.
 */
local void do_exit(exitcode)
    int exitcode;
{
//    static int in_exit = 0;

//    if (in_exit) exit(exitcode);
//    in_exit = 1;
//    FREE(inbuf);
//    FREE(outbuf);
//    FREE(d_buf);
//    FREE(window);
	//printf("\r\nERROR: %x", exitcode);
}


#define slide window


/* Huffman code lookup table entry--this entry is four bytes for machines
   that have 16-bit pointers (e.g. PC's in the small or medium model).