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/*---------------------------------------------------------------------------
file_io.c
This file contains routines for doing direct input/output, file-related
sorts of things. Most of the system-specific code for unzip is contained
here, including the non-echoing password code for decryption (bottom).
Modified: 24 Jun 92 - HAJK
Fix VMS support
---------------------------------------------------------------------------*/
#include "zunzip.h"
#if 0
/****************************/
/* Function FillBitBuffer() */
/****************************/
int FillBitBuffer()
{
/*
* Fill bitbuf, which is 32 bits. This function is only used by the
* READBIT and PEEKBIT macros (which are used by all of the uncompression
* routines).
*/
UWORD temp;
zipeof = 1;
while (bits_left < 25 && ReadByte(&temp) == 8)
{
bitbuf |= (ULONG)temp << bits_left;
bits_left += 8;
zipeof = 0;
}
return 0;
}
/***********************/
/* Function ReadByte() */
/***********************/
int ReadByte(x)
UWORD *x;
{
/*
* read a byte; return 8 if byte available, 0 if not
*/
if (csize-- <= 0)
return 0;
if (incnt == 0) {
if ((incnt = read(zipfd, (char *) inbuf, INBUFSIZ)) <= 0)
return 0;
/* buffer ALWAYS starts on a block boundary: */
inptr = inbuf;
}
*x = *inptr++;
--incnt;
return 8;
}
#else
/*
* This function is used only by the NEEDBYTE macro in inflate.c.
* It fills the buffer and resets the count and pointers for the
* macro to resume processing. The count is set to the number of bytes
* read in minus one, while the pointer is set to the beginning of the
* buffer. This is all to make the macro more efficient.
*
* In exceptional circumstances, zinflate can read a byte or two past the
* end of input, so we allow this for a little bit before returning
* an error. zinflate doesn't actually use the bytes, so the value
* is irrelevant.
*
* Returns 0 on success, non-zero on error.
*/
int FillInBuf()
{
static int eofonce = 0;
incnt = read(zipfd, (char *)inbuf, INBUFSIZ);
if (incnt > 0) { /* Read went okay */
inptr = inbuf;
--incnt;
return 0;
} else if (incnt == 0 && !eofonce) { /* Special fudge case */
eofonce++;
incnt = 2;
inptr = inbuf;
return 0;
} else { /* Error */
return 1;
}
}
#endif
/**************************/
/* Function FlushOutput() */
/**************************/
int FlushOutput()
{
/*
* flush contents of output buffer; return PK-type error code
*/
int len;
if (outcnt) {
len = outcnt;
if (write(outfd, (char *) outout, len) != len)
#ifdef MINIX
if (errno == EFBIG)
if (write(fd, outout, len/2) != len/2 ||
write(fd, outout+len/2, len/2) != len/2)
#endif /* MINIX */
{
return 50; /* 50: disk full */
}
outpos += outcnt;
outcnt = 0;
outptr = outbuf;
}
return (0); /* 0: no error */
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.