mirror of
https://github.com/fadden/nulib2.git
synced 2024-11-19 14:33:47 +00:00
421 lines
9.3 KiB
C
421 lines
9.3 KiB
C
/*
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* NuFX archive manipulation library
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* Copyright (C) 2000 by Andy McFadden, All Rights Reserved.
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* This is free software; you can redistribute it and/or modify it under the
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* terms of the GNU Library General Public License, see the file COPYING.LIB.
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*
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* Functions for reading from and writing to the archive. These are
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* specialized functions that deal with byte ordering and CRC computation.
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* The functions associated with reading from an archive work equally well
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* with streaming archives.
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*/
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#include "NufxLibPriv.h"
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/*
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* ===========================================================================
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* Read and write
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* ===========================================================================
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*/
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/*
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* Read one little-endian bytes, optionally computing a CRC.
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*/
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uchar
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Nu_ReadOneC(NuArchive* pArchive, FILE* fp, ushort* pCrc)
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{
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int ic;
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Assert(pArchive != nil);
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Assert(fp != nil);
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Assert(pCrc != nil);
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ic = getc(fp);
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*pCrc = Nu_UpdateCRC16((uchar)ic, *pCrc);
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return ic;
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}
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uchar
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Nu_ReadOne(NuArchive* pArchive, FILE* fp)
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{
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ushort dummyCrc /*= 0*/;
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return Nu_ReadOneC(pArchive, fp, &dummyCrc);
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}
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/*
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* Write one byte, optionally computing a CRC.
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*/
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void
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Nu_WriteOneC(NuArchive* pArchive, FILE* fp, uchar val, ushort* pCrc)
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{
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Assert(pArchive != nil);
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Assert(fp != nil);
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Assert(pCrc != nil);
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putc(val, fp);
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}
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void
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Nu_WriteOne(NuArchive* pArchive, FILE* fp, uchar val)
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{
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ushort dummyCrc /*= 0*/;
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Nu_WriteOneC(pArchive, fp, val, &dummyCrc);
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}
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/*
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* Read two little-endian bytes, optionally computing a CRC.
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*/
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ushort
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Nu_ReadTwoC(NuArchive* pArchive, FILE* fp, ushort* pCrc)
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{
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int ic1, ic2;
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Assert(pArchive != nil);
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Assert(fp != nil);
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Assert(pCrc != nil);
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ic1 = getc(fp);
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*pCrc = Nu_UpdateCRC16((uchar)ic1, *pCrc);
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ic2 = getc(fp);
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*pCrc = Nu_UpdateCRC16((uchar)ic2, *pCrc);
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return ic1 | ic2 << 8;
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}
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ushort
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Nu_ReadTwo(NuArchive* pArchive, FILE* fp)
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{
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ushort dummyCrc /*= 0*/;
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return Nu_ReadTwoC(pArchive, fp, &dummyCrc);
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}
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/*
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* Write two little-endian bytes, optionally computing a CRC.
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*/
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void
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Nu_WriteTwoC(NuArchive* pArchive, FILE* fp, ushort val, ushort* pCrc)
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{
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int ic1, ic2;
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Assert(pArchive != nil);
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Assert(fp != nil);
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Assert(pCrc != nil);
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ic1 = val & 0xff;
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*pCrc = Nu_UpdateCRC16((uchar)ic1, *pCrc);
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ic2 = val >> 8;
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*pCrc = Nu_UpdateCRC16((uchar)ic2, *pCrc);
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putc(ic1, fp);
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putc(ic2, fp);
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}
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void
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Nu_WriteTwo(NuArchive* pArchive, FILE* fp, ushort val)
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{
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ushort dummyCrc /*= 0*/;
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Nu_WriteTwoC(pArchive, fp, val, &dummyCrc);
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}
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/*
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* Read four little-endian bytes, optionally computing a CRC.
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*/
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ulong
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Nu_ReadFourC(NuArchive* pArchive, FILE* fp, ushort* pCrc)
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{
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int ic1, ic2, ic3, ic4;
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Assert(pArchive != nil);
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Assert(fp != nil);
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Assert(pCrc != nil);
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ic1 = getc(fp);
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*pCrc = Nu_UpdateCRC16((uchar)ic1, *pCrc);
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ic2 = getc(fp);
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*pCrc = Nu_UpdateCRC16((uchar)ic2, *pCrc);
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ic3 = getc(fp);
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*pCrc = Nu_UpdateCRC16((uchar)ic3, *pCrc);
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ic4 = getc(fp);
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*pCrc = Nu_UpdateCRC16((uchar)ic4, *pCrc);
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return ic1 | ic2 << 8 | (ulong)ic3 << 16 | (ulong)ic4 << 24;
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}
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ulong
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Nu_ReadFour(NuArchive* pArchive, FILE* fp)
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{
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ushort dummyCrc /*= 0*/;
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return Nu_ReadFourC(pArchive, fp, &dummyCrc);
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}
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/*
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* Write four little-endian bytes, optionally computing a CRC.
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*/
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void
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Nu_WriteFourC(NuArchive* pArchive, FILE* fp, ulong val, ushort* pCrc)
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{
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int ic1, ic2, ic3, ic4;
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Assert(pArchive != nil);
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Assert(fp != nil);
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Assert(pCrc != nil);
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ic1 = val & 0xff;
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*pCrc = Nu_UpdateCRC16((uchar)ic1, *pCrc);
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ic2 = (val >> 8) & 0xff;
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*pCrc = Nu_UpdateCRC16((uchar)ic2, *pCrc);
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ic3 = (val >> 16) & 0xff;
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*pCrc = Nu_UpdateCRC16((uchar)ic3, *pCrc);
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ic4 = val >> 24;
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*pCrc = Nu_UpdateCRC16((uchar)ic4, *pCrc);
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putc(ic1, fp);
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putc(ic2, fp);
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putc(ic3, fp);
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putc(ic4, fp);
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}
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void
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Nu_WriteFour(NuArchive* pArchive, FILE* fp, ulong val)
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{
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ushort dummyCrc /*=0*/;
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Nu_WriteFourC(pArchive, fp, val, &dummyCrc);
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}
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/*
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* Read an 8-byte NuFX Date/Time structure.
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*
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* I've chosen *not* to filter away the Y2K differences between P8 ShrinkIt
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* and GS/ShrinkIt. It's easy enough to deal with, and I figure the less
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* messing-with, the better.
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*/
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NuDateTime
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Nu_ReadDateTimeC(NuArchive* pArchive, FILE* fp, ushort* pCrc)
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{
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NuDateTime temp;
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int ic;
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Assert(pArchive != nil);
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Assert(fp != nil);
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Assert(pCrc != nil);
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ic = getc(fp);
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*pCrc = Nu_UpdateCRC16((uchar)ic, *pCrc);
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temp.second = ic;
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ic = getc(fp);
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*pCrc = Nu_UpdateCRC16((uchar)ic, *pCrc);
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temp.minute = ic;
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ic = getc(fp);
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*pCrc = Nu_UpdateCRC16((uchar)ic, *pCrc);
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temp.hour = ic;
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ic = getc(fp);
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*pCrc = Nu_UpdateCRC16((uchar)ic, *pCrc);
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temp.year = ic;
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ic = getc(fp);
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*pCrc = Nu_UpdateCRC16((uchar)ic, *pCrc);
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temp.day = ic;
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ic = getc(fp);
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*pCrc = Nu_UpdateCRC16((uchar)ic, *pCrc);
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temp.month = ic;
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ic = getc(fp);
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*pCrc = Nu_UpdateCRC16((uchar)ic, *pCrc);
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temp.extra = ic;
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ic = getc(fp);
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*pCrc = Nu_UpdateCRC16((uchar)ic, *pCrc);
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temp.weekDay = ic;
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return temp;
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}
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NuDateTime
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Nu_ReadDateTime(NuArchive* pArchive, FILE* fp, ushort* pCrc)
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{
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ushort dummyCrc /*= 0*/;
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return Nu_ReadDateTimeC(pArchive, fp, &dummyCrc);
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}
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/*
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* Write an 8-byte NuFX Date/Time structure.
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*/
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void
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Nu_WriteDateTimeC(NuArchive* pArchive, FILE* fp, NuDateTime dateTime,
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ushort* pCrc)
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{
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int ic;
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Assert(pArchive != nil);
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Assert(fp != nil);
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Assert(pCrc != nil);
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ic = dateTime.second;
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*pCrc = Nu_UpdateCRC16((uchar)ic, *pCrc);
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putc(ic, fp);
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ic = dateTime.minute;
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*pCrc = Nu_UpdateCRC16((uchar)ic, *pCrc);
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putc(ic, fp);
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ic = dateTime.hour;
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*pCrc = Nu_UpdateCRC16((uchar)ic, *pCrc);
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putc(ic, fp);
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ic = dateTime.year;
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*pCrc = Nu_UpdateCRC16((uchar)ic, *pCrc);
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putc(ic, fp);
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ic = dateTime.day;
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*pCrc = Nu_UpdateCRC16((uchar)ic, *pCrc);
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putc(ic, fp);
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ic = dateTime.month;
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*pCrc = Nu_UpdateCRC16((uchar)ic, *pCrc);
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putc(ic, fp);
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ic = dateTime.extra;
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*pCrc = Nu_UpdateCRC16((uchar)ic, *pCrc);
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putc(ic, fp);
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ic = dateTime.weekDay;
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*pCrc = Nu_UpdateCRC16((uchar)ic, *pCrc);
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putc(ic, fp);
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}
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void
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Nu_WriteDateTime(NuArchive* pArchive, FILE* fp, NuDateTime dateTime)
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{
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ushort dummyCrc /*= 0*/;
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Nu_WriteDateTimeC(pArchive, fp, dateTime, &dummyCrc);
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}
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/*
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* Read N bytes from the stream, optionally computing a CRC.
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*/
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void
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Nu_ReadBytesC(NuArchive* pArchive, FILE* fp, void* vbuffer, long count,
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ushort* pCrc)
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{
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uchar* buffer = vbuffer;
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int ic;
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Assert(pArchive != nil);
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Assert(fp != nil);
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Assert(pCrc != nil);
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Assert(buffer != nil);
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Assert(count > 0);
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while (count--) {
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ic = getc(fp);
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*pCrc = Nu_UpdateCRC16((uchar)ic, *pCrc);
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*buffer++ = ic;
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}
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}
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void
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Nu_ReadBytes(NuArchive* pArchive, FILE* fp, void* vbuffer, long count)
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{
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ushort dummyCrc /*= 0*/;
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Nu_ReadBytesC(pArchive, fp, vbuffer, count, &dummyCrc);
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}
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/*
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* Write N bytes to the stream, optionally computing a CRC.
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*/
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void
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Nu_WriteBytesC(NuArchive* pArchive, FILE* fp, const void* vbuffer, long count,
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ushort* pCrc)
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{
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const uchar* buffer = vbuffer;
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int ic;
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Assert(pArchive != nil);
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Assert(fp != nil);
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Assert(pCrc != nil);
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Assert(buffer != nil);
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Assert(count > 0);
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while (count--) {
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ic = *buffer++;
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*pCrc = Nu_UpdateCRC16((uchar)ic, *pCrc);
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putc(ic, fp);
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}
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}
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void
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Nu_WriteBytes(NuArchive* pArchive, FILE* fp, const void* vbuffer, long count)
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{
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ushort dummyCrc /*= 0*/;
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Nu_WriteBytesC(pArchive, fp, vbuffer, count, &dummyCrc);
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}
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/*
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* ===========================================================================
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* General
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* ===========================================================================
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*/
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/*
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* Determine whether the stream completed the last set of operations
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* successfully.
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*/
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NuError
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Nu_HeaderIOFailed(NuArchive* pArchive, FILE* fp)
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{
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if (feof(fp) || ferror(fp))
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return kNuErrFile;
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else
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return kNuErrNone;
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}
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/*
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* Seek around in an archive file. If this is a streaming-mode archive,
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* we only allow forward relative seeks, which are emulated with read calls.
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*
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* The values for "ptrname" are the same as for fseek().
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*/
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NuError
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Nu_SeekArchive(NuArchive* pArchive, FILE* fp, long offset, int ptrname)
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{
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if (Nu_IsStreaming(pArchive)) {
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Assert(ptrname == SEEK_CUR);
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Assert(offset > 0);
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/* might be faster to fread a chunk at a time */
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while (offset--)
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(void) getc(fp);
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if (ferror(fp) || feof(fp))
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return kNuErrFileSeek;
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} else {
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if (fseek(fp, offset, ptrname) < 0)
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return kNuErrFileSeek;
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}
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return kNuErrNone;
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}
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/*
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* Rewind an archive to the start of NuFX record data.
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*
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* Note that rewind(3S) resets the error indication, but this doesn't.
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*/
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NuError
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Nu_RewindArchive(NuArchive* pArchive)
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{
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Assert(pArchive != nil);
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Assert(!Nu_IsStreaming(pArchive));
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if (Nu_SeekArchive(pArchive, pArchive->archiveFp,
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pArchive->headerOffset + kNuMasterHeaderSize, SEEK_SET) != 0)
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return kNuErrFileSeek;
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pArchive->currentOffset = pArchive->headerOffset + kNuMasterHeaderSize;
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return kNuErrNone;
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}
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