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nulib2/nufxlib-0/Archive.c

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/*
* NuFX archive manipulation library
* Copyright (C) 2000 by Andy McFadden, All Rights Reserved.
* This is free software; you can redistribute it and/or modify it under the
* terms of the GNU Library General Public License, see the file COPYING.LIB.
*
* Archive structure creation and manipulation.
*/
#include "NufxLibPriv.h"
#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#endif
#ifndef O_BINARY
# define O_BINARY 0
#endif
/* master header identification */
static const uchar kNuMasterID[kNufileIDLen] =
{ 0x4e, 0xf5, 0x46, 0xe9, 0x6c, 0xe5 };
/* other identification; can be no longer than kNufileIDLen */
static const uchar kNuBinary2ID[] =
{ 0x0a, 0x47, 0x4c };
static const uchar kNuSHKSEAID[] =
{ 0xa2, 0x2e, 0x00 };
/*
* Offsets to some interesting places in the wrappers.
*/
#define kNuBNYFileSizeLo 8 /* file size in 512-byte blocks (2B) */
#define kNuBNYFileSizeHi 114 /* ... (2B) */
#define kNuBNYEOFLo 20 /* file size in bytes (3B) */
#define kNuBNYEOFHi 116 /* ... (1B) */
#define kNuBNYDiskSpace 117 /* total space req'd; equiv FileSize (4B) */
#define kNuBNYFilesToFollow 127 /* (1B) #of files in rest of BNY file */
#define kNuSEAFunkySize 11938 /* length of archive + 68 (4B?) */
#define kNuSEAFunkyAdjust 68 /* ... adjustment to "FunkySize" */
#define kNuSEALength1 11946 /* length of archive (4B?) */
#define kNuSEALength2 12001 /* length of archive (4B?) */
static void Nu_CloseAndFree(NuArchive* pArchive);
/*
* ===========================================================================
* Archive and MasterHeader utility functions
* ===========================================================================
*/
/*
* Allocate and initialize a new NuArchive structure.
*/
static NuError
Nu_NuArchiveNew(NuArchive** ppArchive)
{
Assert(ppArchive != nil);
/* validate some assumptions we make throughout the code */
Assert(sizeof(int) >= 2);
Assert(sizeof(ushort) >= 2);
Assert(sizeof(ulong) >= 4);
Assert(sizeof(void*) >= sizeof(NuArchive*));
*ppArchive = Nu_Calloc(nil, sizeof(**ppArchive));
if (*ppArchive == nil)
return kNuErrMalloc;
(*ppArchive)->structMagic = kNuArchiveStructMagic;
(*ppArchive)->recordIdxSeed = 1000; /* could be a random number */
(*ppArchive)->nextRecordIdx = (*ppArchive)->recordIdxSeed;
/*
* Initialize assorted values to defaults. We don't try to do any
* system-specific values here; it's up to the application to decide
* what is most appropriate for the current system.
*/
(*ppArchive)->valAllowDuplicates = false;
(*ppArchive)->valConvertExtractedEOL = kNuConvertOff;
(*ppArchive)->valDataCompression = kNuCompressLZW2;
(*ppArchive)->valDiscardWrapper = false;
(*ppArchive)->valEOL = kNuEOLLF; /* non-UNIX apps must override */
(*ppArchive)->valHandleExisting = kNuMaybeOverwrite;
(*ppArchive)->valIgnoreCRC = false;
(*ppArchive)->valMimicSHK = false;
(*ppArchive)->valModifyOrig = false;
(*ppArchive)->valOnlyUpdateOlder = false;
return kNuErrNone;
}
/*
* Free up a NuArchive structure and its contents.
*/
static NuError
Nu_NuArchiveFree(NuArchive* pArchive)
{
Assert(pArchive != nil);
Assert(pArchive->structMagic == kNuArchiveStructMagic);
(void) Nu_RecordSet_FreeAllRecords(pArchive, &pArchive->origRecordSet);
pArchive->haveToc = false;
(void) Nu_RecordSet_FreeAllRecords(pArchive, &pArchive->copyRecordSet);
(void) Nu_RecordSet_FreeAllRecords(pArchive, &pArchive->newRecordSet);
Nu_Free(nil, pArchive->archivePathname);
Nu_Free(nil, pArchive->tmpPathname);
Nu_Free(nil, pArchive->compBuf);
Nu_Free(nil, pArchive->lzwCompressState);
Nu_Free(nil, pArchive->lzwExpandState);
/* mark it as deceased to prevent further use, then free it */
pArchive->structMagic = kNuArchiveStructMagic ^ 0xffffffff;
Nu_Free(nil, pArchive);
return kNuErrNone;
}
/*
* Copy a NuMasterHeader struct.
*/
void
Nu_MasterHeaderCopy(NuArchive* pArchive, NuMasterHeader* pDstHeader,
const NuMasterHeader* pSrcHeader)
{
Assert(pArchive != nil);
Assert(pDstHeader != nil);
Assert(pSrcHeader != nil);
*pDstHeader = *pSrcHeader;
}
/*
* Get a pointer to the archive master header (this is an API call).
*/
NuError
Nu_GetMasterHeader(NuArchive* pArchive, const NuMasterHeader** ppMasterHeader)
{
if (ppMasterHeader == nil)
return kNuErrInvalidArg;
*ppMasterHeader = &pArchive->masterHeader;
return kNuErrNone;
}
/*
* Allocate the general-purpose compression buffer, if needed.
*/
NuError
Nu_AllocCompressionBufferIFN(NuArchive* pArchive)
{
Assert(pArchive != nil);
if (pArchive->compBuf != nil)
return kNuErrNone;
pArchive->compBuf = Nu_Malloc(pArchive, kNuGenCompBufSize);
if (pArchive->compBuf == nil)
return kNuErrMalloc;
return kNuErrNone;
}
/*
* Return a unique value.
*/
NuRecordIdx
Nu_GetNextRecordIdx(NuArchive* pArchive)
{
return pArchive->nextRecordIdx++;
}
/*
* Return a unique value.
*/
NuThreadIdx
Nu_GetNextThreadIdx(NuArchive* pArchive)
{
return pArchive->nextRecordIdx++; /* just use the record counter */
}
/*
* ===========================================================================
* Wrapper (SEA, BXY, BSE) functions
* ===========================================================================
*/
/*
* Copy the wrapper from the archive file to the temp file.
*/
NuError
Nu_CopyWrapperToTemp(NuArchive* pArchive)
{
NuError err;
Assert(pArchive->headerOffset); /* no wrapper to copy?? */
err = Nu_FSeek(pArchive->archiveFp, 0, SEEK_SET);
BailError(err);
err = Nu_FSeek(pArchive->tmpFp, 0, SEEK_SET);
BailError(err);
err = Nu_CopyFileSection(pArchive, pArchive->tmpFp,
pArchive->archiveFp, pArchive->headerOffset);
BailError(err);
bail:
return err;
}
/*
* Fix up the wrapper. The SEA and BXY headers have some fields
* set according to file length and archive attributes.
*
* Pass in the file pointer that will be written to. Wrappers are
* assumed to start at offset 0.
*
* Wrappers must appear in this order:
* Binary II
* ShrinkIt SEA (Self-Extracting Archive)
*
* If they didn't, we wouldn't be this far.
*
* I have a Binary II specification, but don't have one for SEA, so I'm
* making educated guesses based on the differences between archives. I'd
* guess some of the SEA weirdness stems from some far-sighted support
* for multiple archives within a single SEA wrapper.
*/
NuError
Nu_UpdateWrapper(NuArchive* pArchive, FILE* fp)
{
NuError err = kNuErrNone;
Boolean hasBinary2, hasSea;
uchar identBuf[kNufileIDLen];
ulong archiveLen, archiveLen512;
Assert(pArchive->newMasterHeader.isValid); /* need new crc and len */
hasBinary2 = hasSea = false;
switch (pArchive->archiveType) {
case kNuArchiveNuFX:
goto bail;
case kNuArchiveNuFXInBNY:
hasBinary2 = true;
break;
case kNuArchiveNuFXSelfEx:
hasSea = true;
break;
case kNuArchiveNuFXSelfExInBNY:
hasBinary2 = hasSea = true;
break;
default:
if (pArchive->headerOffset) {
Nu_ReportError(NU_BLOB, kNuErrNone, "Can't fix the wrapper??");
err = kNuErrInternal;
goto bail;
} else
goto bail;
}
err = Nu_FSeek(fp, 0, SEEK_SET);
BailError(err);
if (hasBinary2) {
/* sanity check - make sure it's Binary II */
Nu_ReadBytes(pArchive, fp, identBuf, kNufileIDLen);
if ((err = Nu_HeaderIOFailed(pArchive, fp)) != kNuErrNone) {
Nu_ReportError(NU_BLOB, err, "Failed reading BNY wrapper");
goto bail;
}
if (memcmp(identBuf, kNuBinary2ID, sizeof(kNuBinary2ID)) != 0) {
err = kNuErrInternal;
Nu_ReportError(NU_BLOB, kNuErrNone,"Didn't find Binary II wrapper");
goto bail;
}
/* archiveLen includes the SEA wrapper, if any */
archiveLen = pArchive->newMasterHeader.mhMasterEOF +
(pArchive->headerOffset - kNuBinary2BlockSize);
archiveLen512 = (archiveLen + 511) / 512;
err = Nu_FSeek(fp, kNuBNYFileSizeLo - kNufileIDLen, SEEK_CUR);
BailError(err);
Nu_WriteTwo(pArchive, fp, (ushort)(archiveLen512 & 0xffff));
err = Nu_FSeek(fp, kNuBNYFileSizeHi - (kNuBNYFileSizeLo+2), SEEK_CUR);
BailError(err);
Nu_WriteTwo(pArchive, fp, (ushort)(archiveLen512 >> 16));
err = Nu_FSeek(fp, kNuBNYEOFLo - (kNuBNYFileSizeHi+2), SEEK_CUR);
BailError(err);
Nu_WriteTwo(pArchive, fp, (ushort)(archiveLen & 0xffff));
Nu_WriteOne(pArchive, fp, (uchar)((archiveLen >> 16) & 0xff));
err = Nu_FSeek(fp, kNuBNYEOFHi - (kNuBNYEOFLo+3), SEEK_CUR);
BailError(err);
Nu_WriteOne(pArchive, fp, (uchar)(archiveLen >> 24));
err = Nu_FSeek(fp, kNuBNYDiskSpace - (kNuBNYEOFHi+1), SEEK_CUR);
BailError(err);
Nu_WriteFour(pArchive, fp, archiveLen512);
/* seek just past end of BNY wrapper */
err = Nu_FSeek(fp, kNuBinary2BlockSize - (kNuBNYDiskSpace+4), SEEK_CUR);
BailError(err);
if ((err = Nu_HeaderIOFailed(pArchive, fp)) != kNuErrNone) {
Nu_ReportError(NU_BLOB, err, "Failed updating Binary II wrapper");
goto bail;
}
}
if (hasSea) {
/* sanity check - make sure it's SEA */
Nu_ReadBytes(pArchive, fp, identBuf, kNufileIDLen);
if ((err = Nu_HeaderIOFailed(pArchive, fp)) != kNuErrNone) {
Nu_ReportError(NU_BLOB, err, "Failed reading SEA wrapper");
goto bail;
}
if (memcmp(identBuf, kNuSHKSEAID, sizeof(kNuSHKSEAID)) != 0) {
err = kNuErrInternal;
Nu_ReportError(NU_BLOB, kNuErrNone, "Didn't find SEA wrapper");
goto bail;
}
archiveLen = pArchive->newMasterHeader.mhMasterEOF;
err = Nu_FSeek(fp, kNuSEAFunkySize - kNufileIDLen, SEEK_CUR);
BailError(err);
Nu_WriteFour(pArchive, fp, archiveLen + kNuSEAFunkyAdjust);
err = Nu_FSeek(fp, kNuSEALength1 - (kNuSEAFunkySize+4), SEEK_CUR);
BailError(err);
Nu_WriteTwo(pArchive, fp, (ushort)archiveLen);
err = Nu_FSeek(fp, kNuSEALength2 - (kNuSEALength1+2), SEEK_CUR);
BailError(err);
Nu_WriteTwo(pArchive, fp, (ushort)archiveLen);
/* seek past end of SEA wrapper */
err = Nu_FSeek(fp, kNuSEAOffset - (kNuSEALength2+2), SEEK_CUR);
BailError(err);
if ((err = Nu_HeaderIOFailed(pArchive, fp)) != kNuErrNone) {
Nu_ReportError(NU_BLOB, err, "Failed updating SEA wrapper");
goto bail;
}
}
bail:
return kNuErrNone;
}
/*
* Adjust wrapper-induced padding on the archive.
*
* GS/ShrinkIt v1.1 does some peculiar things with SEA (Self-Extracting
* Archive) files. For no apparent reason, it always adds one extra 00
* byte to the end. When you combine SEA and BXY to make BSE, it will
* leave that extra byte inside the BXY 128-byte padding area, UNLESS
* the archive itself happens to be exactly 128 bytes, in which case
* it throws the pad byte onto the end -- resulting in an archive that
* isn't an exact multiple of 128.
*
* I've chosen to emulate the 1-byte padding "feature" of GSHK, but I'm
* not going to try to emulate the quirky behavior described above.
*
* The SEA pad byte is added first, and then the 128-byte BXY padding
* is considered. In the odd case described above, the file would be
* 127 bytes larger with nufxlib than it is with GSHK. This shouldn't
* require additional disk space to be used, assuming a filesystem block
* size of at least 128 bytes.
*/
NuError
Nu_AdjustWrapperPadding(NuArchive* pArchive, FILE* fp)
{
NuError err = kNuErrNone;
Boolean hasBinary2, hasSea;
hasBinary2 = hasSea = false;
switch (pArchive->archiveType) {
case kNuArchiveNuFX:
goto bail;
case kNuArchiveNuFXInBNY:
hasBinary2 = true;
break;
case kNuArchiveNuFXSelfEx:
hasSea = true;
break;
case kNuArchiveNuFXSelfExInBNY:
hasBinary2 = hasSea = true;
break;
default:
if (pArchive->headerOffset) {
Nu_ReportError(NU_BLOB, kNuErrNone, "Can't check the padding??");
err = kNuErrInternal;
goto bail;
} else
goto bail;
}
err = Nu_FSeek(fp, 0, SEEK_END);
BailError(err);
if (hasSea && pArchive->valMimicSHK) {
/* throw on a single pad byte, for no apparent reason whatsoever */
Nu_WriteOne(pArchive, fp, 0);
}
if (hasBinary2) {
/* pad out to the next 128-byte boundary */
long curOffset;
err = Nu_FTell(fp, &curOffset);
BailError(err);
if (curOffset & 0x7f) {
int i;
for (i = kNuBinary2BlockSize - (curOffset & 0x7f); i > 0; i--)
Nu_WriteOne(pArchive, fp, 0);
}
}
if ((err = Nu_HeaderIOFailed(pArchive, fp)) != kNuErrNone) {
Nu_ReportError(NU_BLOB, err, "Failed updating wrapper padding");
goto bail;
}
bail:
return err;
}
/*
* ===========================================================================
* Open an archive
* ===========================================================================
*/
/*
* Read the master header from the archive file.
*
* This also handles skipping the first 128 bytes of a .BXY file and the
* front part of a self-extracting GSHK archive.
*
* We try to provide helpful messages about things that aren't archives,
* but try to stay silent about files that are other types of archives.
* That way, if the application is trying a series of libraries to find
* one that will accept the file, we don't generate spurious complaints.
*
* On exit, the stream will be positioned just past the master header.
*/
static NuError
Nu_ReadMasterHeader(NuArchive* pArchive)
{
NuError err;
ushort crc;
FILE* fp;
NuMasterHeader* pHeader;
Boolean isBinary2 = false;
Boolean isSea = false;
Assert(pArchive != nil);
fp = pArchive->archiveFp; /* saves typing */
pHeader = &pArchive->masterHeader;
pArchive->headerOffset = 0;
Nu_ReadBytes(pArchive, fp, pHeader->mhNufileID, kNufileIDLen);
/* may have read fewer than kNufileIDLen; that's okay */
if (memcmp(pHeader->mhNufileID, kNuBinary2ID, sizeof(kNuBinary2ID)) == 0)
{
int count;
/* looks like a Binary II archive, might be BXY or BSE; seek forward */
err = Nu_SeekArchive(pArchive, fp, kNuBNYFilesToFollow - kNufileIDLen,
SEEK_CUR);
if (err != kNuErrNone) {
err = kNuErrNotNuFX;
/* probably too short to be BNY, so go ahead and whine */
Nu_ReportError(NU_BLOB, kNuErrNone,
"Might be Binary II, but it's not NuFX");
goto bail;
}
/*
* Check "files to follow", so we can be sure this isn't a BNY that
* just happened to have a .SHK as the first file. If it is, then
* any updates to the archive will trash the rest of the BNY files.
*/
count = Nu_ReadOne(pArchive, fp);
if (count != 0) {
err = kNuErrNotNuFX;
/*Nu_ReportError(NU_BLOB, kNuErrNone,
"This is a Binary II archive with %d files in it", count+1);*/
DBUG(("This is a Binary II archive with %d files in it\n",count+1));
goto bail;
}
/* that was last item in BNY header, no need to seek */
Assert(kNuBNYFilesToFollow == kNuBinary2BlockSize -1);
isBinary2 = true;
pArchive->headerOffset += kNuBinary2BlockSize;
Nu_ReadBytes(pArchive, fp, pHeader->mhNufileID, kNufileIDLen);
}
if (memcmp(pHeader->mhNufileID, kNuSHKSEAID, sizeof(kNuSHKSEAID)) == 0)
{
/* might be GSHK self-extracting; seek forward */
err = Nu_SeekArchive(pArchive, fp, kNuSEAOffset - kNufileIDLen,
SEEK_CUR);
if (err != kNuErrNone) {
err = kNuErrNotNuFX;
Nu_ReportError(NU_BLOB, kNuErrNone,
"Looks like GS executable, not NuFX");
goto bail;
}
isSea = true;
pArchive->headerOffset += kNuSEAOffset;
Nu_ReadBytes(pArchive, fp, pHeader->mhNufileID, kNufileIDLen);
}
if (memcmp(kNuMasterID, pHeader->mhNufileID, kNufileIDLen) != 0) {
err = kNuErrNotNuFX;
if (isBinary2) {
/*Nu_ReportError(NU_BLOB, kNuErrNone,
"Looks like Binary II, not NuFX");*/
DBUG(("Looks like Binary II, not NuFX\n"));
} else if (isSea)
Nu_ReportError(NU_BLOB, kNuErrNone,
"Looks like GS executable, not NuFX");
else if (Nu_HeaderIOFailed(pArchive, fp) != kNuErrNone)
Nu_ReportError(NU_BLOB, kNuErrNone,
"Couldn't read enough data, not NuFX?");
else
Nu_ReportError(NU_BLOB, kNuErrNone,
"Not a NuFX archive? Got 0x%02x%02x%02x%02x%02x%02x...",
pHeader->mhNufileID[0], pHeader->mhNufileID[1],
pHeader->mhNufileID[2], pHeader->mhNufileID[3],
pHeader->mhNufileID[4], pHeader->mhNufileID[5]);
goto bail;
}
crc = 0;
pHeader->mhMasterCRC = Nu_ReadTwo(pArchive, fp);
pHeader->mhTotalRecords = Nu_ReadFourC(pArchive, fp, &crc);
pHeader->mhArchiveCreateWhen = Nu_ReadDateTimeC(pArchive, fp, &crc);
pHeader->mhArchiveModWhen = Nu_ReadDateTimeC(pArchive, fp, &crc);
pHeader->mhMasterVersion = Nu_ReadTwoC(pArchive, fp, &crc);
Nu_ReadBytesC(pArchive, fp, pHeader->mhReserved1,
kNufileMasterReserved1Len, &crc);
pHeader->mhMasterEOF = Nu_ReadFourC(pArchive, fp, &crc);
Nu_ReadBytesC(pArchive, fp, pHeader->mhReserved2,
kNufileMasterReserved2Len, &crc);
/* check for errors in any of the above reads */
if ((err = Nu_HeaderIOFailed(pArchive, fp)) != kNuErrNone) {
Nu_ReportError(NU_BLOB, err, "Failed reading master header");
goto bail;
}
if (pHeader->mhMasterVersion > kNuMaxMHVersion) {
err = kNuErrBadMHVersion;
Nu_ReportError(NU_BLOB, err, "Bad MH version %u",
pHeader->mhMasterVersion);
goto bail;
}
/* compare the CRC */
if (!pArchive->valIgnoreCRC && crc != pHeader->mhMasterCRC) {
if (!Nu_ShouldIgnoreBadCRC(pArchive, nil, kNuErrBadMHCRC)) {
err = kNuErrBadMHCRC;
Nu_ReportError(NU_BLOB, err, "Stored MH CRC=0x%04x, calc=0x%04x",
pHeader->mhMasterCRC, crc);
goto bail;
}
}
/*
* Check for an unusual condition. GS/ShrinkIt appears to update
* the archive structure in the disk file periodically as it writes,
* so it's possible to get an apparently complete archive (with
* correct CRCs in the master and record headers!) that is actually
* only partially written. I did this by accident when archiving a
* 3.5" disk across a slow AppleTalk network. The only obvious
* indication of brain-damage, until you try to unpack the archive,
* seems to be a bogus MasterEOF==48.
*/
if (pHeader->mhMasterEOF <= kNuMasterHeaderSize) {
err = kNuErrNoRecords;
Nu_ReportError(NU_BLOB, err,
"Master EOF is %ld, archive is probably truncated",
pHeader->mhMasterEOF);
goto bail;
}
/*
* Set up a few things in the archive structure on our way out.
*/
if (isBinary2) {
if (isSea)
pArchive->archiveType = kNuArchiveNuFXSelfExInBNY;
else
pArchive->archiveType = kNuArchiveNuFXInBNY;
} else {
if (isSea)
pArchive->archiveType = kNuArchiveNuFXSelfEx;
else
pArchive->archiveType = kNuArchiveNuFX;
}
if (isSea || isBinary2) {
DBUG(("--- Archive isSea=%d isBinary2=%d type=%d\n",
isSea, isBinary2, pArchive->archiveType));
}
/*pArchive->origNumRecords = pHeader->mhTotalRecords;*/
pArchive->currentOffset = pArchive->headerOffset + kNuMasterHeaderSize;
/*DBUG(("--- GOT: records=%ld, vers=%d, EOF=%ld, type=%d, hdrOffset=%ld\n",
pHeader->mhTotalRecords, pHeader->mhMasterVersion,
pHeader->mhMasterEOF, pArchive->archiveType, pArchive->headerOffset));*/
pHeader->isValid = true;
bail:
return err;
}
/*
* Prepare the NuArchive and NuMasterHeader structures for use with a
* newly-created archive.
*/
static void
Nu_InitNewArchive(NuArchive* pArchive)
{
NuMasterHeader* pHeader;
Assert(pArchive != nil);
pHeader = &pArchive->masterHeader;
memcpy(pHeader->mhNufileID, kNuMasterID, kNufileIDLen);
/*pHeader->mhMasterCRC*/
pHeader->mhTotalRecords = 0;
Nu_SetCurrentDateTime(&pHeader->mhArchiveCreateWhen);
/*pHeader->mhArchiveModWhen*/
pHeader->mhMasterVersion = kNuOurMHVersion;
/*pHeader->mhReserved1*/
pHeader->mhMasterEOF = kNuMasterHeaderSize;
/*pHeader->mhReserved2*/
pHeader->isValid = true;
/* no need to use a temp file for a newly-created archive */
pArchive->valModifyOrig = true;
}
/*
* Open an archive in streaming read-only mode.
*/
NuError
Nu_StreamOpenRO(FILE* infp, NuArchive** ppArchive)
{
NuError err;
NuArchive* pArchive = nil;
Assert(infp != nil);
Assert(ppArchive != nil);
err = Nu_NuArchiveNew(ppArchive);
if (err != kNuErrNone)
goto bail;
pArchive = *ppArchive;
pArchive->openMode = kNuOpenStreamingRO;
pArchive->archiveFp = infp;
pArchive->archivePathname = strdup("(stream)");
err = Nu_ReadMasterHeader(pArchive);
BailError(err);
bail:
if (err != kNuErrNone) {
if (pArchive != nil)
(void) Nu_NuArchiveFree(pArchive);
*ppArchive = nil;
}
return err;
}
/*
* Open an archive in non-streaming read-only mode.
*/
NuError
Nu_OpenRO(const char* archivePathname, NuArchive** ppArchive)
{
NuError err;
NuArchive* pArchive = nil;
FILE* fp = nil;
if (archivePathname == nil || !strlen(archivePathname) || ppArchive == nil)
return kNuErrInvalidArg;
*ppArchive = nil;
fp = fopen(archivePathname, kNuFileOpenReadOnly);
if (fp == nil) {
Nu_ReportError(NU_BLOB, errno, "Unable to open '%s'", archivePathname);
err = kNuErrFileOpen;
goto bail;
}
err = Nu_NuArchiveNew(ppArchive);
if (err != kNuErrNone)
goto bail;
pArchive = *ppArchive;
pArchive->openMode = kNuOpenRO;
pArchive->archiveFp = fp;
fp = nil;
pArchive->archivePathname = strdup(archivePathname);
err = Nu_ReadMasterHeader(pArchive);
BailError(err);
bail:
if (err != kNuErrNone) {
if (pArchive != nil) {
(void) Nu_CloseAndFree(pArchive);
*ppArchive = nil;
}
if (fp != nil)
fclose(fp);
}
return err;
}
/*
* Open a temp file. If "fileName" contains six Xs ("XXXXXX"), it will
* be treated as a mktemp-style template, and modified before use.
*/
static NuError
Nu_OpenTempFile(char* fileName, FILE** pFp)
{
NuArchive* pArchive = nil; /* dummy for NU_BLOB */
NuError err = kNuErrNone;
int len;
/*
* If this is a mktemp-style template, use mktemp or mkstemp to fill in
* the blanks.
*
* BUG: not all implementations of mktemp actually generate a unique
* name. We probably need to do probing here. Some BSD variants like
* to complain about mktemp, since it's generally a bad way to do
* things.
*/
len = strlen(fileName);
if (len > 6 && strcmp(fileName + len - 6, "XXXXXX") == 0) {
#if defined(HAVE_MKSTEMP) && defined(HAVE_FDOPEN)
int fd;
DBUG(("+++ Using mkstemp\n"));
/* this modifies the template *and* opens the file */
fd = mkstemp(fileName);
if (fd < 0) {
err = errno ? errno : kNuErrFileOpen;
Nu_ReportError(NU_BLOB, kNuErrNone, "mkstemp failed on '%s'",
fileName);
goto bail;
}
DBUG(("--- Fd-opening temp file '%s'\n", fileName));
*pFp = fdopen(fd, kNuFileOpenReadWriteCreat);
if (*pFp == nil) {
close(fd);
err = errno ? errno : kNuErrFileOpen;
goto bail;
}
/* file is open, we're done */
goto bail;
#else
char* result;
DBUG(("+++ Using mktemp\n"));
result = mktemp(fileName);
if (result == nil) {
Nu_ReportError(NU_BLOB, kNuErrNone, "mktemp failed on '%s'",
fileName);
err = kNuErrInternal;
goto bail;
}
/* now open the filename as usual */
#endif
}
DBUG(("--- Opening temp file '%s'\n", fileName));
#if defined(HAVE_FDOPEN)
{
int fd;
fd = open(fileName, O_RDWR|O_CREAT|O_EXCL|O_BINARY, 0600);
*pFp = fdopen(fd, kNuFileOpenReadWriteCreat);
if (*pFp == nil) {
close(fd);
err = errno ? errno : kNuErrFileOpen;
goto bail;
}
}
#else
/* (not sure how portable "access" is... I think it's POSIX) */
if (access(fileName, F_OK) == 0) {
err = kNuErrFileExists;
goto bail;
}
*pFp = fopen(fileName, kNuFileOpenReadWriteCreat);
if (*pFp == nil) {
err = errno ? errno : kNuErrFileOpen;
goto bail;
}
#endif
bail:
return err;
}
/*
* Open an archive in read-write mode, optionally creating it if it doesn't
* exist.
*/
NuError
Nu_OpenRW(const char* archivePathname, const char* tmpPathname, ulong flags,
NuArchive** ppArchive)
{
NuError err;
FILE* fp = nil;
FILE* tmpFp = nil;
NuArchive* pArchive = nil;
char* tmpPathDup = nil;
Boolean archiveExists;
Boolean newlyCreated;
if (archivePathname == nil || !strlen(archivePathname) ||
tmpPathname == nil || !strlen(tmpPathname) || ppArchive == nil ||
(flags & ~(kNuOpenCreat|kNuOpenExcl)) != 0)
{
return kNuErrInvalidArg;
}
archiveExists = (access(archivePathname, F_OK) == 0);
/*
* Open or create archive file.
*/
if (archiveExists) {
if ((flags & kNuOpenCreat) && (flags & kNuOpenExcl)) {
err = kNuErrFileExists;
Nu_ReportError(NU_BLOB, err, "File '%s' exists", archivePathname);
goto bail;
}
fp = fopen(archivePathname, kNuFileOpenReadWrite);
newlyCreated = false;
} else {
if (!(flags & kNuOpenCreat)) {
err = kNuErrFileNotFound;
Nu_ReportError(NU_BLOB, err, "File '%s' not found",archivePathname);
goto bail;
}
fp = fopen(archivePathname, kNuFileOpenReadWriteCreat);
newlyCreated = true;
}
if (fp == nil) {
Nu_ReportError(NU_BLOB, errno, "Unable to open '%s'", archivePathname);
err = kNuErrFileOpen;
goto bail;
}
/*
* Treat zero-length files as newly-created archives.
*/
if (archiveExists && !newlyCreated) {
long length;
err = Nu_GetFileLength(nil, fp, &length);
BailError(err);
if (!length) {
DBUG(("--- treating zero-length file as newly created archive\n"));
newlyCreated = true;
}
}
/*
* Create a temp file. We don't need one for a newly-created archive,
* at least not right away. It's possible the caller could add some
* files, flush the changes, and then want to delete them without
* closing and reopening the archive.
*
* So, create a temp file whether we think we need one or not. Won't
* do any harm, and might save us some troubles later.
*/
tmpPathDup = strdup(tmpPathname);
BailNil(tmpPathDup);
err = Nu_OpenTempFile(tmpPathDup, &tmpFp);
if (err != kNuErrNone) {
Nu_ReportError(NU_BLOB, err, "Failed opening temp file '%s'",
tmpPathname);
goto bail;
}
err = Nu_NuArchiveNew(ppArchive);
if (err != kNuErrNone)
goto bail;
pArchive = *ppArchive;
pArchive->openMode = kNuOpenRW;
pArchive->newlyCreated = newlyCreated;
pArchive->archivePathname = strdup(archivePathname);
pArchive->archiveFp = fp;
fp = nil;
pArchive->tmpFp = tmpFp;
tmpFp = nil;
pArchive->tmpPathname = tmpPathDup;
tmpPathDup = nil;
if (archiveExists && !newlyCreated) {
err = Nu_ReadMasterHeader(pArchive);
BailError(err);
} else {
Nu_InitNewArchive(pArchive);
}
bail:
if (err != kNuErrNone) {
if (pArchive != nil) {
(void) Nu_CloseAndFree(pArchive);
*ppArchive = nil;
}
if (fp != nil)
fclose(fp);
if (tmpFp != nil)
fclose(tmpFp);
if (tmpPathDup != nil)
Nu_Free(pArchive, tmpPathDup);
}
return err;
}
/*
* ===========================================================================
* Update an archive
* ===========================================================================
*/
/*
* Write the NuFX master header at the current offset.
*/
NuError
Nu_WriteMasterHeader(NuArchive* pArchive, FILE* fp,
NuMasterHeader* pHeader)
{
NuError err;
long crcOffset;
ushort crc;
Assert(pArchive != nil);
Assert(fp != nil);
Assert(pHeader != nil);
Assert(pHeader->isValid);
Assert(pHeader->mhMasterVersion == kNuOurMHVersion);
crc = 0;
Nu_WriteBytes(pArchive, fp, pHeader->mhNufileID, kNufileIDLen);
err = Nu_FTell(fp, &crcOffset);
BailError(err);
Nu_WriteTwo(pArchive, fp, 0);
Nu_WriteFourC(pArchive, fp, pHeader->mhTotalRecords, &crc);
Nu_WriteDateTimeC(pArchive, fp, pHeader->mhArchiveCreateWhen, &crc);
Nu_WriteDateTimeC(pArchive, fp, pHeader->mhArchiveModWhen, &crc);
Nu_WriteTwoC(pArchive, fp, pHeader->mhMasterVersion, &crc);
Nu_WriteBytesC(pArchive, fp, pHeader->mhReserved1,
kNufileMasterReserved1Len, &crc);
Nu_WriteFourC(pArchive, fp, pHeader->mhMasterEOF, &crc);
Nu_WriteBytesC(pArchive, fp, pHeader->mhReserved2,
kNufileMasterReserved2Len, &crc);
/* go back and write the CRC (sadly, the seek will flush the stdio buf) */
pHeader->mhMasterCRC = crc;
err = Nu_FSeek(fp, crcOffset, SEEK_SET);
BailError(err);
Nu_WriteTwo(pArchive, fp, pHeader->mhMasterCRC);
/* check for errors in any of the above writes */
if ((err = Nu_HeaderIOFailed(pArchive, fp)) != kNuErrNone) {
Nu_ReportError(NU_BLOB, err, "Failed writing master header");
goto bail;
}
DBUG(("--- Master header written successfully at %ld (crc=0x%04x)\n",
crcOffset - kNufileIDLen, crc));
bail:
return err;
}
/*
* ===========================================================================
* Close an archive
* ===========================================================================
*/
/*
* Close all open files, and free the memory associated with the structure.
*
* If it's a brand-new archive, and we didn't add anything to it, then we
* want to remove the stub archive file.
*/
static void
Nu_CloseAndFree(NuArchive* pArchive)
{
if (pArchive->archiveFp != nil) {
DBUG(("--- Closing archive\n"));
fclose(pArchive->archiveFp);
pArchive->archiveFp = nil;
}
if (pArchive->tmpFp != nil) {
DBUG(("--- Closing and removing temp file\n"));
fclose(pArchive->tmpFp);
pArchive->tmpFp = nil;
Assert(pArchive->tmpPathname != nil);
if (remove(pArchive->tmpPathname) != 0) {
Nu_ReportError(NU_BLOB, errno, "Unable to remove temp file '%s'",
pArchive->tmpPathname);
/* keep going */
}
}
if (pArchive->newlyCreated && Nu_RecordSet_IsEmpty(&pArchive->origRecordSet))
{
DBUG(("--- Newly-created archive unmodified; removing it\n"));
if (remove(pArchive->archivePathname) != 0) {
Nu_ReportError(NU_BLOB, errno, "Unable to remove archive file '%s'",
pArchive->archivePathname);
}
}
Nu_NuArchiveFree(pArchive);
}
/*
* Flush pending changes to the archive, then close it.
*/
NuError
Nu_Close(NuArchive* pArchive)
{
NuError err = kNuErrNone;
long flushStatus;
Assert(pArchive != nil);
if (!Nu_IsReadOnly(pArchive))
err = Nu_Flush(pArchive, &flushStatus);
if (err == kNuErrNone)
Nu_CloseAndFree(pArchive);
else {
DBUG(("--- Close NuFlush status was 0x%4lx\n", flushStatus));
}
if (err != kNuErrNone) {
DBUG(("--- Nu_Close returning error %d\n", err));
}
return err;
}
/*
* ===========================================================================
* Delete and replace an archive
* ===========================================================================
*/
/*
* Delete the archive file, which should already have been closed.
*/
NuError
Nu_DeleteArchiveFile(NuArchive* pArchive)
{
Assert(pArchive != nil);
Assert(pArchive->archiveFp == nil);
Assert(pArchive->archivePathname != nil);
return Nu_DeleteFile(pArchive->archivePathname);
}
/*
* Rename the temp file on top of the original archive. The temp file
* should be closed, and the archive file should be deleted.
*/
NuError
Nu_RenameTempToArchive(NuArchive* pArchive)
{
Assert(pArchive != nil);
Assert(pArchive->archiveFp == nil);
Assert(pArchive->tmpFp == nil);
Assert(pArchive->archivePathname != nil);
Assert(pArchive->tmpPathname != nil);
return Nu_RenameFile(pArchive->tmpPathname, pArchive->archivePathname);
}
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