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/*---------------------------------------------------------------------------
unzip.c
Highly butchered minimum unzip code for inflate.c
---------------------------------------------------------------------------*/
#include "zunzip.h" /* includes, defines, and macros */
#define VERSION "v4.20p BETA of 2-18-92"
/**********************/
/* Global Variables */
/**********************/
longint csize; /* used by list_files(), ReadByte(): must be signed */
static longint ucsize; /* used by list_files(), unReduce(), unImplode() */
ULONG mask_bits[] =
{0x00000000L,
0x00000001L, 0x00000003L, 0x00000007L, 0x0000000fL,
0x0000001fL, 0x0000003fL, 0x0000007fL, 0x000000ffL,
0x000001ffL, 0x000003ffL, 0x000007ffL, 0x00000fffL,
0x00001fffL, 0x00003fffL, 0x00007fffL, 0x0000ffffL,
0x0001ffffL, 0x0003ffffL, 0x0007ffffL, 0x000fffffL,
0x001fffffL, 0x003fffffL, 0x007fffffL, 0x00ffffffL,
0x01ffffffL, 0x03ffffffL, 0x07ffffffL, 0x0fffffffL,
0x1fffffffL, 0x3fffffffL, 0x7fffffffL, 0xffffffffL};
/*---------------------------------------------------------------------------
Input file variables:
---------------------------------------------------------------------------*/
byte *inbuf = NULL, *inptr; /* input buffer (any size is legal) and pointer */
int incnt;
ULONG bitbuf;
int bits_left;
boolean zipeof;
int zipfd; /* zipfile file handle */
/*---------------------------------------------------------------------------
Output stream variables:
---------------------------------------------------------------------------*/
byte *outbuf; /* buffer for rle look-back */
byte *outptr;
byte *outout; /* scratch pad for ASCII-native trans */
longint outpos; /* absolute position in outfile */
int outcnt; /* current position in outbuf */
int outfd;
/*---------------------------------------------------------------------------
unzip.c static global variables (visible only within this file):
---------------------------------------------------------------------------*/
static byte *hold;
/*******************/
/* Main unzip code */
/*******************/
int unzip( FILE *inFile, FILE *outFile ) /* return PK-type error code (except under VMS) */
{
int status = 0;
outfd = fileno( outFile );
zipfd = fileno( inFile );
inbuf = (byte *) (malloc(INBUFSIZ + 4)); /* 4 extra for hold[] (below) */
outbuf = (byte *) (malloc(OUTBUFSIZ + 1)); /* 1 extra for string termin. */
outout = outbuf; /* else just point to outbuf */
if ((inbuf == NULL) || (outbuf == NULL) || (outout == NULL)) {
fprintf(stderr, "error: can't allocate unzip buffers\n");
RETURN(4); /* 4-8: insufficient memory */
}
hold = &inbuf[INBUFSIZ]; /* to check for boundary-spanning signatures */
bits_left = 0;
bitbuf = 0;
outpos = 0L;
outcnt = 0;
outptr = outbuf;
zipeof = 0;
/* Set output buffer to initial value */
memset(outbuf, 0, OUTBUFSIZ);
/* Go from high- to low-level I/O */
lseek( zipfd, ftell(inFile), SEEK_SET );
if ((incnt = read(zipfd, (char *) inbuf,INBUFSIZ)) <= 0) {
fprintf(stderr, "error: unexpected end if input");
status = -1; /* can still do next file */
}
inptr = inbuf;
/* Read in implode information */
csize = 1000L; /* Dummy size just to get input bits */
/* Get compressed, uncompressed file sizes */
csize = ucsize = 1000000000L; /* Make sure we can read in anything */
if (status == 0)
inflate(); /* Ftoomschk! */
/* Flush output buffer before returning */
if (status == 0 && FlushOutput())
status = -1;
free(inbuf);
free(outbuf);
inbuf = outbuf = outout = NULL;
return(status);
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.