mirror of
https://github.com/fadden/ciderpress.git
synced 2024-11-27 08:49:20 +00:00
84706d7ea4
This integrates the latest NufxLib sources, and updates CiderPress to work with the API changes.
404 lines
9.6 KiB
C
404 lines
9.6 KiB
C
/*
|
|
* NuFX archive manipulation library
|
|
* Copyright (C) 2000-2007 by Andy McFadden, All Rights Reserved.
|
|
* This is free software; you can redistribute it and/or modify it under the
|
|
* terms of the BSD License, see the file COPYING-LIB.
|
|
*
|
|
* Functions for reading from and writing to the archive. These are
|
|
* specialized functions that deal with byte ordering and CRC computation.
|
|
* The functions associated with reading from an archive work equally well
|
|
* with streaming archives.
|
|
*/
|
|
#include "NufxLibPriv.h"
|
|
|
|
|
|
/* this makes valgrind and purify happy, at some tiny cost in speed */
|
|
#define CLEAN_INIT =0
|
|
/*#define CLEAN_INIT */
|
|
|
|
|
|
/*
|
|
* ===========================================================================
|
|
* Read and write
|
|
* ===========================================================================
|
|
*/
|
|
|
|
/*
|
|
* Read one byte, optionally computing a CRC.
|
|
*/
|
|
uint8_t Nu_ReadOneC(NuArchive* pArchive, FILE* fp, uint16_t* pCrc)
|
|
{
|
|
int ic;
|
|
|
|
Assert(pArchive != NULL);
|
|
Assert(fp != NULL);
|
|
Assert(pCrc != NULL);
|
|
|
|
ic = getc(fp);
|
|
*pCrc = Nu_UpdateCRC16((uint8_t)ic, *pCrc);
|
|
|
|
return (uint8_t) ic;
|
|
}
|
|
|
|
uint8_t Nu_ReadOne(NuArchive* pArchive, FILE* fp)
|
|
{
|
|
uint16_t dummyCrc CLEAN_INIT;
|
|
return Nu_ReadOneC(pArchive, fp, &dummyCrc);
|
|
}
|
|
|
|
/*
|
|
* Write one byte, optionally computing a CRC.
|
|
*/
|
|
void Nu_WriteOneC(NuArchive* pArchive, FILE* fp, uint8_t val, uint16_t* pCrc)
|
|
{
|
|
Assert(pArchive != NULL);
|
|
Assert(fp != NULL);
|
|
Assert(pCrc != NULL);
|
|
|
|
putc(val, fp);
|
|
}
|
|
|
|
void Nu_WriteOne(NuArchive* pArchive, FILE* fp, uint8_t val)
|
|
{
|
|
uint16_t dummyCrc CLEAN_INIT;
|
|
Nu_WriteOneC(pArchive, fp, val, &dummyCrc);
|
|
}
|
|
|
|
|
|
/*
|
|
* Read two little-endian bytes, optionally computing a CRC.
|
|
*/
|
|
uint16_t Nu_ReadTwoC(NuArchive* pArchive, FILE* fp, uint16_t* pCrc)
|
|
{
|
|
int ic1, ic2;
|
|
|
|
Assert(pArchive != NULL);
|
|
Assert(fp != NULL);
|
|
Assert(pCrc != NULL);
|
|
|
|
ic1 = getc(fp);
|
|
*pCrc = Nu_UpdateCRC16((uint8_t)ic1, *pCrc);
|
|
ic2 = getc(fp);
|
|
*pCrc = Nu_UpdateCRC16((uint8_t)ic2, *pCrc);
|
|
|
|
return ic1 | ic2 << 8;
|
|
}
|
|
|
|
uint16_t Nu_ReadTwo(NuArchive* pArchive, FILE* fp)
|
|
{
|
|
uint16_t dummyCrc CLEAN_INIT;
|
|
return Nu_ReadTwoC(pArchive, fp, &dummyCrc);
|
|
}
|
|
|
|
|
|
/*
|
|
* Write two little-endian bytes, optionally computing a CRC.
|
|
*/
|
|
void Nu_WriteTwoC(NuArchive* pArchive, FILE* fp, uint16_t val, uint16_t* pCrc)
|
|
{
|
|
int ic1, ic2;
|
|
|
|
Assert(pArchive != NULL);
|
|
Assert(fp != NULL);
|
|
Assert(pCrc != NULL);
|
|
|
|
ic1 = val & 0xff;
|
|
*pCrc = Nu_UpdateCRC16((uint8_t)ic1, *pCrc);
|
|
ic2 = val >> 8;
|
|
*pCrc = Nu_UpdateCRC16((uint8_t)ic2, *pCrc);
|
|
|
|
putc(ic1, fp);
|
|
putc(ic2, fp);
|
|
}
|
|
|
|
void Nu_WriteTwo(NuArchive* pArchive, FILE* fp, uint16_t val)
|
|
{
|
|
uint16_t dummyCrc CLEAN_INIT;
|
|
Nu_WriteTwoC(pArchive, fp, val, &dummyCrc);
|
|
}
|
|
|
|
|
|
/*
|
|
* Read four little-endian bytes, optionally computing a CRC.
|
|
*/
|
|
uint32_t Nu_ReadFourC(NuArchive* pArchive, FILE* fp, uint16_t* pCrc)
|
|
{
|
|
int ic1, ic2, ic3, ic4;
|
|
|
|
Assert(pArchive != NULL);
|
|
Assert(fp != NULL);
|
|
Assert(pCrc != NULL);
|
|
|
|
ic1 = getc(fp);
|
|
*pCrc = Nu_UpdateCRC16((uint8_t)ic1, *pCrc);
|
|
ic2 = getc(fp);
|
|
*pCrc = Nu_UpdateCRC16((uint8_t)ic2, *pCrc);
|
|
ic3 = getc(fp);
|
|
*pCrc = Nu_UpdateCRC16((uint8_t)ic3, *pCrc);
|
|
ic4 = getc(fp);
|
|
*pCrc = Nu_UpdateCRC16((uint8_t)ic4, *pCrc);
|
|
|
|
return ic1 | ic2 << 8 | (uint32_t)ic3 << 16 | (uint32_t)ic4 << 24;
|
|
}
|
|
|
|
uint32_t Nu_ReadFour(NuArchive* pArchive, FILE* fp)
|
|
{
|
|
uint16_t dummyCrc CLEAN_INIT;
|
|
return Nu_ReadFourC(pArchive, fp, &dummyCrc);
|
|
}
|
|
|
|
|
|
/*
|
|
* Write four little-endian bytes, optionally computing a CRC.
|
|
*/
|
|
void Nu_WriteFourC(NuArchive* pArchive, FILE* fp, uint32_t val, uint16_t* pCrc)
|
|
{
|
|
int ic1, ic2, ic3, ic4;
|
|
|
|
Assert(pArchive != NULL);
|
|
Assert(fp != NULL);
|
|
Assert(pCrc != NULL);
|
|
|
|
ic1 = val & 0xff;
|
|
*pCrc = Nu_UpdateCRC16((uint8_t)ic1, *pCrc);
|
|
ic2 = (val >> 8) & 0xff;
|
|
*pCrc = Nu_UpdateCRC16((uint8_t)ic2, *pCrc);
|
|
ic3 = (val >> 16) & 0xff;
|
|
*pCrc = Nu_UpdateCRC16((uint8_t)ic3, *pCrc);
|
|
ic4 = val >> 24;
|
|
*pCrc = Nu_UpdateCRC16((uint8_t)ic4, *pCrc);
|
|
|
|
putc(ic1, fp);
|
|
putc(ic2, fp);
|
|
putc(ic3, fp);
|
|
putc(ic4, fp);
|
|
}
|
|
|
|
void Nu_WriteFour(NuArchive* pArchive, FILE* fp, uint32_t val)
|
|
{
|
|
uint16_t dummyCrc CLEAN_INIT;
|
|
Nu_WriteFourC(pArchive, fp, val, &dummyCrc);
|
|
}
|
|
|
|
|
|
/*
|
|
* Read an 8-byte NuFX Date/Time structure.
|
|
*
|
|
* I've chosen *not* to filter away the Y2K differences between P8 ShrinkIt
|
|
* and GS/ShrinkIt. It's easy enough to deal with, and I figure the less
|
|
* messing-with, the better.
|
|
*/
|
|
NuDateTime Nu_ReadDateTimeC(NuArchive* pArchive, FILE* fp, uint16_t* pCrc)
|
|
{
|
|
NuDateTime temp;
|
|
int ic;
|
|
|
|
Assert(pArchive != NULL);
|
|
Assert(fp != NULL);
|
|
Assert(pCrc != NULL);
|
|
|
|
ic = getc(fp);
|
|
*pCrc = Nu_UpdateCRC16((uint8_t)ic, *pCrc);
|
|
temp.second = ic;
|
|
ic = getc(fp);
|
|
*pCrc = Nu_UpdateCRC16((uint8_t)ic, *pCrc);
|
|
temp.minute = ic;
|
|
ic = getc(fp);
|
|
*pCrc = Nu_UpdateCRC16((uint8_t)ic, *pCrc);
|
|
temp.hour = ic;
|
|
ic = getc(fp);
|
|
*pCrc = Nu_UpdateCRC16((uint8_t)ic, *pCrc);
|
|
temp.year = ic;
|
|
ic = getc(fp);
|
|
*pCrc = Nu_UpdateCRC16((uint8_t)ic, *pCrc);
|
|
temp.day = ic;
|
|
ic = getc(fp);
|
|
*pCrc = Nu_UpdateCRC16((uint8_t)ic, *pCrc);
|
|
temp.month = ic;
|
|
ic = getc(fp);
|
|
*pCrc = Nu_UpdateCRC16((uint8_t)ic, *pCrc);
|
|
temp.extra = ic;
|
|
ic = getc(fp);
|
|
*pCrc = Nu_UpdateCRC16((uint8_t)ic, *pCrc);
|
|
temp.weekDay = ic;
|
|
|
|
return temp;
|
|
}
|
|
|
|
NuDateTime Nu_ReadDateTime(NuArchive* pArchive, FILE* fp, uint16_t* pCrc)
|
|
{
|
|
uint16_t dummyCrc CLEAN_INIT;
|
|
return Nu_ReadDateTimeC(pArchive, fp, &dummyCrc);
|
|
}
|
|
|
|
|
|
/*
|
|
* Write an 8-byte NuFX Date/Time structure.
|
|
*/
|
|
void Nu_WriteDateTimeC(NuArchive* pArchive, FILE* fp, NuDateTime dateTime,
|
|
uint16_t* pCrc)
|
|
{
|
|
int ic;
|
|
|
|
Assert(pArchive != NULL);
|
|
Assert(fp != NULL);
|
|
Assert(pCrc != NULL);
|
|
|
|
ic = dateTime.second;
|
|
*pCrc = Nu_UpdateCRC16((uint8_t)ic, *pCrc);
|
|
putc(ic, fp);
|
|
ic = dateTime.minute;
|
|
*pCrc = Nu_UpdateCRC16((uint8_t)ic, *pCrc);
|
|
putc(ic, fp);
|
|
ic = dateTime.hour;
|
|
*pCrc = Nu_UpdateCRC16((uint8_t)ic, *pCrc);
|
|
putc(ic, fp);
|
|
ic = dateTime.year;
|
|
*pCrc = Nu_UpdateCRC16((uint8_t)ic, *pCrc);
|
|
putc(ic, fp);
|
|
ic = dateTime.day;
|
|
*pCrc = Nu_UpdateCRC16((uint8_t)ic, *pCrc);
|
|
putc(ic, fp);
|
|
ic = dateTime.month;
|
|
*pCrc = Nu_UpdateCRC16((uint8_t)ic, *pCrc);
|
|
putc(ic, fp);
|
|
ic = dateTime.extra;
|
|
*pCrc = Nu_UpdateCRC16((uint8_t)ic, *pCrc);
|
|
putc(ic, fp);
|
|
ic = dateTime.weekDay;
|
|
*pCrc = Nu_UpdateCRC16((uint8_t)ic, *pCrc);
|
|
putc(ic, fp);
|
|
}
|
|
|
|
void Nu_WriteDateTime(NuArchive* pArchive, FILE* fp, NuDateTime dateTime)
|
|
{
|
|
uint16_t dummyCrc CLEAN_INIT;
|
|
Nu_WriteDateTimeC(pArchive, fp, dateTime, &dummyCrc);
|
|
}
|
|
|
|
|
|
/*
|
|
* Read N bytes from the stream, optionally computing a CRC.
|
|
*/
|
|
void Nu_ReadBytesC(NuArchive* pArchive, FILE* fp, void* vbuffer, long count,
|
|
uint16_t* pCrc)
|
|
{
|
|
uint8_t* buffer = vbuffer;
|
|
int ic;
|
|
|
|
Assert(pArchive != NULL);
|
|
Assert(fp != NULL);
|
|
Assert(pCrc != NULL);
|
|
Assert(buffer != NULL);
|
|
Assert(count > 0);
|
|
|
|
while (count--) {
|
|
ic = getc(fp);
|
|
*pCrc = Nu_UpdateCRC16((uint8_t)ic, *pCrc);
|
|
*buffer++ = ic;
|
|
}
|
|
}
|
|
|
|
void Nu_ReadBytes(NuArchive* pArchive, FILE* fp, void* vbuffer, long count)
|
|
{
|
|
uint16_t dummyCrc CLEAN_INIT;
|
|
Nu_ReadBytesC(pArchive, fp, vbuffer, count, &dummyCrc);
|
|
}
|
|
|
|
|
|
/*
|
|
* Write N bytes to the stream, optionally computing a CRC.
|
|
*/
|
|
void Nu_WriteBytesC(NuArchive* pArchive, FILE* fp, const void* vbuffer,
|
|
long count, uint16_t* pCrc)
|
|
{
|
|
const uint8_t* buffer = vbuffer;
|
|
int ic;
|
|
|
|
Assert(pArchive != NULL);
|
|
Assert(fp != NULL);
|
|
Assert(pCrc != NULL);
|
|
Assert(buffer != NULL);
|
|
Assert(count > 0);
|
|
|
|
while (count--) {
|
|
ic = *buffer++;
|
|
*pCrc = Nu_UpdateCRC16((uint8_t)ic, *pCrc);
|
|
putc(ic, fp);
|
|
}
|
|
}
|
|
|
|
void Nu_WriteBytes(NuArchive* pArchive, FILE* fp, const void* vbuffer,
|
|
long count)
|
|
{
|
|
uint16_t dummyCrc CLEAN_INIT;
|
|
Nu_WriteBytesC(pArchive, fp, vbuffer, count, &dummyCrc);
|
|
}
|
|
|
|
|
|
/*
|
|
* ===========================================================================
|
|
* General
|
|
* ===========================================================================
|
|
*/
|
|
|
|
/*
|
|
* Determine whether the stream completed the last set of operations
|
|
* successfully.
|
|
*/
|
|
NuError Nu_HeaderIOFailed(NuArchive* pArchive, FILE* fp)
|
|
{
|
|
if (feof(fp) || ferror(fp))
|
|
return kNuErrFile;
|
|
else
|
|
return kNuErrNone;
|
|
}
|
|
|
|
|
|
/*
|
|
* Seek around in an archive file. If this is a streaming-mode archive,
|
|
* we only allow forward relative seeks, which are emulated with read calls.
|
|
*
|
|
* The values for "ptrname" are the same as for fseek().
|
|
*/
|
|
NuError Nu_SeekArchive(NuArchive* pArchive, FILE* fp, long offset, int ptrname)
|
|
{
|
|
if (Nu_IsStreaming(pArchive)) {
|
|
Assert(ptrname == SEEK_CUR);
|
|
Assert(offset >= 0);
|
|
|
|
/* OPT: might be faster to fread a chunk at a time */
|
|
while (offset--)
|
|
(void) getc(fp);
|
|
|
|
if (ferror(fp) || feof(fp))
|
|
return kNuErrFileSeek;
|
|
} else {
|
|
if (fseek(fp, offset, ptrname) < 0)
|
|
return kNuErrFileSeek;
|
|
}
|
|
|
|
return kNuErrNone;
|
|
}
|
|
|
|
|
|
/*
|
|
* Rewind an archive to the start of NuFX record data.
|
|
*
|
|
* Note that rewind(3S) resets the error indication, but this doesn't.
|
|
*/
|
|
NuError Nu_RewindArchive(NuArchive* pArchive)
|
|
{
|
|
Assert(pArchive != NULL);
|
|
Assert(!Nu_IsStreaming(pArchive));
|
|
|
|
if (Nu_SeekArchive(pArchive, pArchive->archiveFp,
|
|
pArchive->headerOffset + kNuMasterHeaderSize, SEEK_SET) != 0)
|
|
return kNuErrFileSeek;
|
|
|
|
pArchive->currentOffset = pArchive->headerOffset + kNuMasterHeaderSize;
|
|
|
|
return kNuErrNone;
|
|
}
|
|
|