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ciderpress/nufxlib/FileIO.c
Andy McFadden 6bcf388c3e Update NufxLib with recent 3.1.0 changes
2015-12-26 16:50:42 -08:00

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/*
* 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.
*
* Operations on output (i.e. non-archive) files, largely system-specific.
* Portions taken from NuLib, including some code that Devin Reade worked on.
*
* It could be argued that "create file" should be a callback function,
* since it is so heavily system-specific, and most of the other
* system dependencies are handled by the application rather than the
* NuFX library. It would also provide a cleaner solution for renaming
* extracted files. However, the goal of the library is to do the work
* for the application, not the other way around; and while it might be
* nice to offload all direct file handling on the application, it
* complicates rather than simplifies the interface.
*/
#include "NufxLibPriv.h"
#ifdef MAC_LIKE
# include <sys/xattr.h>
#endif
/*
* For systems (e.g. Visual C++ 6.0) that don't have these standard values.
*/
#ifndef S_IRUSR
# define S_IRUSR 0400
# define S_IWUSR 0200
# define S_IXUSR 0100
# define S_IRWXU (S_IRUSR|S_IWUSR|S_IXUSR)
# define S_IRGRP (S_IRUSR >> 3)
# define S_IWGRP (S_IWUSR >> 3)
# define S_IXGRP (S_IXUSR >> 3)
# define S_IRWXG (S_IRWXU >> 3)
# define S_IROTH (S_IRGRP >> 3)
# define S_IWOTH (S_IWGRP >> 3)
# define S_IXOTH (S_IXGRP >> 3)
# define S_IRWXO (S_IRWXG >> 3)
#endif
#ifndef S_ISREG
# define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
# define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
#endif
/*
* ===========================================================================
* DateTime conversions
* ===========================================================================
*/
/*
* Dates and times in a NuFX archive are always considered to be in the
* local time zone. The use of GMT time stamps would have been more
* appropriate for an archive, but local time works well enough.
*
* Regarding Y2K on the Apple II:
*
* Dave says P8 drivers should return year values in the range 0..99, where
* 40..99 = 1940..1999, and 0..39 = 2000..2039. Year values 100..127 should
* never be used. For ProDOS 8, the year 2000 is "00".
*
* The IIgs ReadTimeHex call uses "year minus 1900". For GS/OS, the year
* 2000 is "100".
*
* The NuFX file type note says the archive format should work like
* The IIgs ReadTimeHex call, which uses "year minus 1900" as its
* format. GS/ShrinkIt v1.1 uses the IIgs date calls, and so stores the
* year 2000 as "100". P8 ShrinkIt v3.4 uses the P8 mapping, and stores
* it as "0". Neither really quite understands what the other is doing.
*
* For our purposes, we will follow the NuFX standard and emit "100"
* for the year 2000, but will accept and understand "0" as well.
*/
#if defined(UNIX_LIKE) || defined(WINDOWS_LIKE)
/*
* Convert from local time in a NuDateTime struct to GMT seconds since 1970.
*
* If the conversion is invalid, "*pWhen" is set to zero.
*/
static void Nu_DateTimeToGMTSeconds(const NuDateTime* pDateTime, time_t* pWhen)
{
struct tm tmbuf;
time_t when;
Assert(pDateTime != NULL);
Assert(pWhen != NULL);
tmbuf.tm_sec = pDateTime->second;
tmbuf.tm_min = pDateTime->minute;
tmbuf.tm_hour = pDateTime->hour;
tmbuf.tm_mday = pDateTime->day +1;
tmbuf.tm_mon = pDateTime->month;
tmbuf.tm_year = pDateTime->year;
if (pDateTime->year < 40)
tmbuf.tm_year += 100; /* P8 uses 0-39 for 2000-2039 */
tmbuf.tm_wday = 0;
tmbuf.tm_yday = 0;
tmbuf.tm_isdst = -1; /* let it figure DST and time zone */
#if defined(HAVE_MKTIME)
when = mktime(&tmbuf);
#elif defined(HAVE_TIMELOCAL)
when = timelocal(&tmbuf);
#else
# error "need time converter"
#endif
if (when == (time_t) -1)
*pWhen = 0;
else
*pWhen = when;
}
/*
* Convert from GMT seconds since 1970 to local time in a NuDateTime struct.
*/
static void Nu_GMTSecondsToDateTime(const time_t* pWhen, NuDateTime *pDateTime)
{
struct tm* ptm;
Assert(pWhen != NULL);
Assert(pDateTime != NULL);
#if defined(HAVE_LOCALTIME_R) && defined(USE_REENTRANT_CALLS)
struct tm res;
ptm = localtime_r(pWhen, &res);
#else
/* NOTE: not thread-safe */
ptm = localtime(pWhen);
#endif
pDateTime->second = ptm->tm_sec;
pDateTime->minute = ptm->tm_min;
pDateTime->hour = ptm->tm_hour;
pDateTime->day = ptm->tm_mday -1;
pDateTime->month = ptm->tm_mon;
pDateTime->year = ptm->tm_year;
pDateTime->extra = 0;
pDateTime->weekDay = ptm->tm_wday +1;
}
#endif
/*
* Fill in the current time.
*/
void Nu_SetCurrentDateTime(NuDateTime* pDateTime)
{
Assert(pDateTime != NULL);
#if defined(UNIX_LIKE) || defined(WINDOWS_LIKE)
{
time_t now = time(NULL);
Nu_GMTSecondsToDateTime(&now, pDateTime);
}
#else
#error "Port this"
#endif
}
/*
* Returns "true" if "pWhen1" is older than "pWhen2". Returns false if
* "pWhen1" is the same age or newer than "pWhen2".
*
* On systems with mktime, it would be straightforward to convert the dates
* to time in seconds, and compare them that way. However, I don't want
* to rely on that function too heavily, so we just compare fields.
*/
Boolean Nu_IsOlder(const NuDateTime* pWhen1, const NuDateTime* pWhen2)
{
long result, year1, year2;
/* adjust for P8 ShrinkIt Y2K problem */
year1 = pWhen1->year;
if (year1 < 40)
year1 += 100;
year2 = pWhen2->year;
if (year2 < 40)
year2 += 100;
result = year1 - year2;
if (!result)
result = pWhen1->month - pWhen2->month;
if (!result)
result = pWhen1->day - pWhen2->day;
if (!result)
result = pWhen1->hour - pWhen2->hour;
if (!result)
result = pWhen1->minute - pWhen2->minute;
if (!result)
result = pWhen1->second - pWhen2->second;
if (result < 0)
return true;
return false;
}
/*
* ===========================================================================
* Get/set file info
* ===========================================================================
*/
/*
* System-independent (mostly) file info struct.
*/
typedef struct NuFileInfo {
Boolean isValid; /* init to "false", set "true" after we get data */
Boolean isRegularFile; /* is this a regular file? */
Boolean isDirectory; /* is this a directory? */
Boolean isForked; /* does file have a non-empty resource fork? */
uint32_t dataEof;
NuDateTime modWhen;
mode_t unixMode; /* UNIX-style permissions */
} NuFileInfo;
#define kDefaultFileType 0 /* "NON" */
#define kDefaultAuxType 0 /* $0000 */
/*
* Determine whether the record has both data and resource forks.
*
* TODO: if we're not using "mask dataless", scanning threads may not
* get the right answer, because GSHK omits theads for zero-length forks.
* We could check pRecord->recStorageType, though we have to be careful
* because that's overloaded for disk images. In any event, the result
* from this method isn't relevant unless we're trying to use forked
* files on the native filesystem.
*/
static Boolean Nu_IsForkedFile(NuArchive* pArchive, const NuRecord* pRecord)
{
const NuThread* pThread;
NuThreadID threadID;
Boolean gotData, gotRsrc;
int i;
gotData = gotRsrc = false;
for (i = 0; i < (int)pRecord->recTotalThreads; i++) {
pThread = Nu_GetThread(pRecord, i);
Assert(pThread != NULL);
threadID = NuMakeThreadID(pThread->thThreadClass,pThread->thThreadKind);
if (threadID == kNuThreadIDDataFork)
gotData = true;
else if (threadID == kNuThreadIDRsrcFork)
gotRsrc = true;
}
if (gotData && gotRsrc)
return true;
else
return false;
}
#if defined(MAC_LIKE)
# if defined(HAS_RESOURCE_FORKS)
/*
* String to append to the filename to access the resource fork.
*
* This appears to be the correct way to access the resource fork, since
* at least OS X 10.1. Up until 10.7 ("Lion", July 2011), you could also
* access the fork with "/rsrc".
*/
static const char kMacRsrcPath[] = "/..namedfork/rsrc";
/*
* Generates the resource fork pathname from the file path.
*
* The caller must free the string returned.
*/
static UNICHAR* GetResourcePath(const UNICHAR* pathnameUNI)
{
Assert(pathnameUNI != NULL);
// sizeof(kMacRsrcPath) includes the string and the terminating null byte
const size_t bufLen =
strlen(pathnameUNI) * sizeof(UNICHAR) + sizeof(kMacRsrcPath);
char* buf;
buf = (char*) malloc(bufLen);
snprintf(buf, bufLen, "%s%s", pathnameUNI, kMacRsrcPath);
return buf;
}
# endif /*HAS_RESOURCE_FORKS*/
/*
* Due to historical reasons, the XATTR_FINDERINFO_NAME (defined to be
* ``com.apple.FinderInfo'') extended attribute must be 32 bytes; see the
* ATTR_CMN_FNDRINFO section in getattrlist(2).
*
* The FinderInfo block is the concatenation of a FileInfo structure
* and an ExtendedFileInfo (or ExtendedFolderInfo) structure -- see
* ATTR_CMN_FNDRINFO in getattrlist(2).
*
* All we're really interested in is the file type and creator code,
* which are stored big-endian in the first 8 bytes.
*/
static const int kFinderInfoSize = 32;
/*
* Set the file type and creator type.
*/
static NuError Nu_SetFinderInfo(NuArchive* pArchive, const NuRecord* pRecord,
const UNICHAR* pathnameUNI)
{
uint8_t fiBuf[kFinderInfoSize];
size_t actual = getxattr(pathnameUNI, XATTR_FINDERINFO_NAME,
fiBuf, sizeof(fiBuf), 0, 0);
if (actual == (size_t) -1 && errno == ENOATTR) {
// doesn't yet have Finder info
memset(fiBuf, 0, sizeof(fiBuf));
} else if (actual != kFinderInfoSize) {
Nu_ReportError(NU_BLOB, errno,
"Finder info on '%s' returned %d", pathnameUNI, (int) actual);
return kNuErrFile;
}
uint8_t proType = (uint8_t) pRecord->recFileType;
uint16_t proAux = (uint16_t) pRecord->recExtraType;
/*
* Attempt to use one of the convenience types. If nothing matches,
* use the generic pdos/pXYZ approach. Note that PSYS/PS16 will
* lose the file's aux type.
*
* I'm told this is from page 336 of _Programmer's Reference for
* System 6.0_.
*/
uint8_t* fileTypeBuf = fiBuf;
uint8_t* creatorBuf = fiBuf + 4;
memcpy(creatorBuf, "pdos", 4);
if (proType == 0x00 && proAux == 0x0000) {
memcpy(fileTypeBuf, "BINA", 4);
} else if (proType == 0x04 && proAux == 0x0000) {
memcpy(fileTypeBuf, "TEXT", 4);
} else if (proType == 0xff) {
memcpy(fileTypeBuf, "PSYS", 4);
} else if (proType == 0xb3 && (proAux & 0xff00) != 0xdb00) {
memcpy(fileTypeBuf, "PS16", 4);
} else if (proType == 0xd7 && proAux == 0x0000) {
memcpy(fileTypeBuf, "MIDI", 4);
} else if (proType == 0xd8 && proAux == 0x0000) {
memcpy(fileTypeBuf, "AIFF", 4);
} else if (proType == 0xd8 && proAux == 0x0001) {
memcpy(fileTypeBuf, "AIFC", 4);
} else if (proType == 0xe0 && proAux == 0x0005) {
memcpy(creatorBuf, "dCpy", 4);
memcpy(fileTypeBuf, "dImg", 4);
} else {
fileTypeBuf[0] = 'p';
fileTypeBuf[1] = proType;
fileTypeBuf[2] = (uint8_t) (proAux >> 8);
fileTypeBuf[3] = (uint8_t) proAux;
}
if (setxattr(pathnameUNI, XATTR_FINDERINFO_NAME, fiBuf, sizeof(fiBuf),
0, 0) != 0)
{
Nu_ReportError(NU_BLOB, errno,
"Unable to set Finder info on '%s'", pathnameUNI);
return kNuErrFile;
}
return kNuErrNone;
}
#endif /*MAC_LIKE*/
/*
* Get the file info into a NuFileInfo struct. Fields which are
* inappropriate for the current system are set to default values.
*/
static NuError Nu_GetFileInfo(NuArchive* pArchive, const UNICHAR* pathnameUNI,
NuFileInfo* pFileInfo)
{
NuError err = kNuErrNone;
Assert(pArchive != NULL);
Assert(pathnameUNI != NULL);
Assert(pFileInfo != NULL);
pFileInfo->isValid = false;
#if defined(UNIX_LIKE) || defined(WINDOWS_LIKE)
{
struct stat sbuf;
int cc;
cc = stat(pathnameUNI, &sbuf);
if (cc) {
if (errno == ENOENT)
err = kNuErrFileNotFound;
else
err = kNuErrFileStat;
goto bail;
}
pFileInfo->isRegularFile = false;
if (S_ISREG(sbuf.st_mode))
pFileInfo->isRegularFile = true;
pFileInfo->isDirectory = false;
if (S_ISDIR(sbuf.st_mode))
pFileInfo->isDirectory = true;
/* BUG: should check for 32-bit overflow from 64-bit off_t */
pFileInfo->dataEof = sbuf.st_size;
pFileInfo->isForked = false;
# if defined(MAC_LIKE) && defined(HAS_RESOURCE_FORKS)
if (!pFileInfo->isDirectory) {
/*
* Check for the presence of a resource fork. You can check
* these from a terminal with "ls -l@" -- look for the
* "com.apple.ResourceFork" attribute.
*
* We can either use getxattr() and check for the presence of
* the attribute, or get the file length with stat(). I
* don't know if xattr has always worked with resource forks,
* so we'll stick with stat for now.
*/
UNICHAR* rsrcPath = GetResourcePath(pathnameUNI);
struct stat res_sbuf;
if (stat(rsrcPath, &res_sbuf) == 0) {
pFileInfo->isForked = (res_sbuf.st_size != 0);
}
free(rsrcPath);
}
# endif
Nu_GMTSecondsToDateTime(&sbuf.st_mtime, &pFileInfo->modWhen);
pFileInfo->unixMode = sbuf.st_mode;
pFileInfo->isValid = true;
}
#else
#error "Port this"
#endif
bail:
return err;
}
/*
* Determine whether a specific fork in the file exists.
*
* On systems that don't support forked files, the "checkRsrcFork" argument
* is ignored. If forked files are supported, and we are extracting a
* file with data and resource forks, we only claim it exists if it has
* nonzero length.
*/
static NuError Nu_FileForkExists(NuArchive* pArchive,
const UNICHAR* pathnameUNI, Boolean isForkedFile, Boolean checkRsrcFork,
Boolean* pExists, NuFileInfo* pFileInfo)
{
NuError err = kNuErrNone;
Assert(pArchive != NULL);
Assert(pathnameUNI != NULL);
Assert(checkRsrcFork == true || checkRsrcFork == false);
Assert(pExists != NULL);
Assert(pFileInfo != NULL);
#if defined(UNIX_LIKE) || defined(WINDOWS_LIKE)
# if !defined(MAC_LIKE)
/*
* On Unix and Windows we ignore "isForkedFile" and "checkRsrcFork".
* The file must not exist at all.
*/
Assert(pArchive->lastFileCreatedUNI == NULL);
# endif
*pExists = true;
err = Nu_GetFileInfo(pArchive, pathnameUNI, pFileInfo);
if (err == kNuErrFileNotFound) {
err = kNuErrNone;
*pExists = false;
}
# if defined(MAC_LIKE)
/*
* On Mac OS X, we'll use the resource fork, but we may not want to
* overwrite existing data.
*/
if (*pExists && checkRsrcFork) {
*pExists = pFileInfo->isForked;
}
# endif
#elif defined(__ORCAC__)
/*
* If the file doesn't exist, great. If it does, and "lastFileCreated"
* matches up with this one, then we know that it exists because we
* created it.
*
* This is great unless the record has two data forks or something
* equally dopey, so we check to be sure that the fork we want to
* put the data into is currently empty.
*
* It is possible, though asinine, for a Mac OS or GS/OS extraction
* program to put the data and resource forks of a record into
* separate files, so we can't just assume that because we wrote
* the data fork to file A it is okay for file B to exist. That's
* why we compare the pathname instead of just remembering that
* we already created a file for this record.
*/
#error "Finish me"
#else
#error "Port this"
#endif
return err;
}
/*
* Set the dates on a file according to what's in the record.
*/
static NuError Nu_SetFileDates(NuArchive* pArchive, const NuRecord* pRecord,
const UNICHAR* pathnameUNI)
{
NuError err = kNuErrNone;
Assert(pArchive != NULL);
Assert(pRecord != NULL);
Assert(pathnameUNI != NULL);
#if defined(UNIX_LIKE) || defined(WINDOWS_LIKE)
{
struct utimbuf utbuf;
/* ignore create time, and set access time equal to mod time */
Nu_DateTimeToGMTSeconds(&pRecord->recModWhen, &utbuf.modtime);
utbuf.actime = utbuf.modtime;
/* only do it if the NuDateTime was valid */
if (utbuf.modtime) {
if (utime(pathnameUNI, &utbuf) < 0) {
Nu_ReportError(NU_BLOB, errno,
"Unable to set time stamp on '%s'", pathnameUNI);
err = kNuErrFileSetDate;
goto bail;
}
}
}
#else
#error "Port this"
#endif
bail:
return err;
}
/*
* Returns "true" if the record is locked (in the ProDOS sense).
*
* Bits 31-8 reserved, must be zero
* Bit 7 (D) 1 = destroy enabled
* Bit 6 (R) 1 = rename enabled
* Bit 5 (B) 1 = file needs to be backed up
* Bits 4-3 reserved, must be zero
* Bit 2 (I) 1 = file is invisible
* Bit 1 (W) 1 = write enabled
* Bit 0 (R) 1 = read enabled
*
* A "locked" file would be 00?00001, "unlocked" 11?00011, with many
* possible variations. For our purposes, we treat all files as unlocked
* unless they match the classic "locked" bit pattern.
*/
static Boolean Nu_IsRecordLocked(const NuRecord* pRecord)
{
if (pRecord->recAccess == 0x21L || pRecord->recAccess == 0x01L)
return true;
else
return false;
}
/*
* Set the file access permissions based on what's in the record.
*
* This assumes that the file is currently writable, so we only need
* to do something if the original file was "locked".
*/
static NuError Nu_SetFileAccess(NuArchive* pArchive, const NuRecord* pRecord,
const UNICHAR* pathnameUNI)
{
NuError err = kNuErrNone;
Assert(pArchive != NULL);
Assert(pRecord != NULL);
Assert(pathnameUNI != NULL);
#if defined(UNIX_LIKE) || defined(WINDOWS_LIKE)
/* only need to do something if the file was "locked" */
if (Nu_IsRecordLocked(pRecord)) {
mode_t mask;
/* set it to 444, modified by umask */
mask = umask(0);
umask(mask);
//DBUG(("+++ chmod '%s' %03o (mask=%03o)\n", pathname,
// (S_IRUSR | S_IRGRP | S_IROTH) & ~mask, mask));
if (chmod(pathnameUNI, (S_IRUSR | S_IRGRP | S_IROTH) & ~mask) < 0) {
Nu_ReportError(NU_BLOB, errno,
"unable to set access for '%s' to %03o", pathnameUNI,
(int) mask);
err = kNuErrFileSetAccess;
goto bail;
}
}
#else
#error "Port this"
#endif
bail:
return err;
}
/*
* ===========================================================================
* Create/open an output file
* ===========================================================================
*/
/*
* Prepare an existing file for writing.
*
* Generally this just involves ensuring that the file is writable. If
* this is a convenient place to truncate it, we should do that too.
*
* 20150103: we don't seem to be doing the truncation here, so prepRsrc
* is unused.
*/
static NuError Nu_PrepareForWriting(NuArchive* pArchive,
const UNICHAR* pathnameUNI, Boolean prepRsrc, NuFileInfo* pFileInfo)
{
NuError err = kNuErrNone;
Assert(pArchive != NULL);
Assert(pathnameUNI != NULL);
Assert(prepRsrc == true || prepRsrc == false);
Assert(pFileInfo != NULL);
Assert(pFileInfo->isValid == true);
/* don't go playing with directories, pipes, etc */
if (pFileInfo->isRegularFile != true)
return kNuErrNotRegularFile;
#if defined(UNIX_LIKE) || defined(WINDOWS_LIKE)
if (!(pFileInfo->unixMode & S_IWUSR)) {
/* make it writable by owner, plus whatever it was before */
if (chmod(pathnameUNI, S_IWUSR | pFileInfo->unixMode) < 0) {
Nu_ReportError(NU_BLOB, errno,
"unable to set access for '%s'", pathnameUNI);
err = kNuErrFileSetAccess;
goto bail;
}
}
return kNuErrNone;
#else
#error "Port this"
#endif
bail:
return err;
}
/*
* Invoke the system-dependent directory creation function.
*/
static NuError Nu_Mkdir(NuArchive* pArchive, const char* dir)
{
NuError err = kNuErrNone;
Assert(pArchive != NULL);
Assert(dir != NULL);
#if defined(UNIX_LIKE)
if (mkdir(dir, S_IRWXU | S_IRGRP|S_IXGRP | S_IROTH|S_IXOTH) < 0) {
err = errno ? errno : kNuErrDirCreate;
Nu_ReportError(NU_BLOB, err, "Unable to create dir '%s'", dir);
goto bail;
}
#elif defined(WINDOWS_LIKE)
if (mkdir(dir) < 0) {
err = errno ? errno : kNuErrDirCreate;
Nu_ReportError(NU_BLOB, err, "Unable to create dir '%s'", dir);
goto bail;
}
#else
#error "Port this"
#endif
bail:
return err;
}
/*
* Create a single subdirectory if it doesn't exist. If the next-highest
* subdirectory level doesn't exist either, cut down the pathname and
* recurse.
*/
static NuError Nu_CreateSubdirIFN(NuArchive* pArchive,
const UNICHAR* pathStartUNI, const char* pathEnd, char fssep)
{
NuError err = kNuErrNone;
NuFileInfo fileInfo;
char* tmpBuf = NULL;
Assert(pArchive != NULL);
Assert(pathStartUNI != NULL);
Assert(pathEnd != NULL);
Assert(fssep != '\0');
/* pathStart might have whole path, but we only want up to "pathEnd" */
tmpBuf = strdup(pathStartUNI);
tmpBuf[pathEnd - pathStartUNI +1] = '\0';
err = Nu_GetFileInfo(pArchive, tmpBuf, &fileInfo);
if (err == kNuErrFileNotFound) {
/* dir doesn't exist; move up a level and check parent */
pathEnd = strrchr(tmpBuf, fssep);
if (pathEnd != NULL) {
pathEnd--;
Assert(pathEnd >= tmpBuf);
err = Nu_CreateSubdirIFN(pArchive, tmpBuf, pathEnd, fssep);
BailError(err);
}
/* parent is taken care of; create this one */
err = Nu_Mkdir(pArchive, tmpBuf);
BailError(err);
} else if (err != kNuErrNone) {
goto bail;
} else {
/* file does exist, make sure it's a directory */
Assert(fileInfo.isValid == true);
if (!fileInfo.isDirectory) {
err = kNuErrNotDir;
Nu_ReportError(NU_BLOB, err, "Unable to create path '%s'", tmpBuf);
goto bail;
}
}
bail:
Nu_Free(pArchive, tmpBuf);
return err;
}
/*
* Create subdirectories, if needed. The paths leading up to the filename
* in "pathname" will be created.
*
* If "pathname" is just a filename, or the set of directories matches
* the last directory we created, we don't do anything.
*/
static NuError Nu_CreatePathIFN(NuArchive* pArchive, const UNICHAR* pathnameUNI,
UNICHAR fssep)
{
NuError err = kNuErrNone;
const char* pathStart;
const char* pathEnd;
Assert(pArchive != NULL);
Assert(pathnameUNI != NULL);
Assert(fssep != '\0');
pathStart = pathnameUNI;
#if !defined(MAC_LIKE) /* On the Mac, if it's a full path, treat it like one */
// 20150103: not sure what use case this is for
if (pathnameUNI[0] == fssep)
pathStart++;
#endif
/* NOTE: not expecting names like "foo/bar/ack/", with terminating fssep */
pathEnd = strrchr(pathStart, fssep);
if (pathEnd == NULL) {
/* no subdirectory components found */
goto bail;
}
pathEnd--;
Assert(pathEnd >= pathStart);
if (pathEnd - pathStart < 0)
goto bail;
/*
* On some filesystems, strncasecmp would be appropriate here. However,
* this is meant solely as an optimization to avoid extra stat() calls,
* so we want to use the most restrictive case.
*/
if (pArchive->lastDirCreatedUNI &&
strncmp(pathStart, pArchive->lastDirCreatedUNI,
pathEnd - pathStart +1) == 0)
{
/* we created this one recently, don't do it again */
goto bail;
}
/*
* Test to determine which directories exist. The most likely case
* is that some or all of the components have already been created,
* so we start with the last one and work backward.
*/
err = Nu_CreateSubdirIFN(pArchive, pathStart, pathEnd, fssep);
BailError(err);
bail:
return err;
}
/*
* Open the file for writing, possibly truncating it.
*/
static NuError Nu_OpenFileForWrite(NuArchive* pArchive,
const UNICHAR* pathnameUNI, Boolean openRsrc, FILE** pFp)
{
#if defined(MAC_LIKE) && defined(HAS_RESOURCE_FORKS)
if (openRsrc) {
UNICHAR* rsrcPath = GetResourcePath(pathnameUNI);
*pFp = fopen(rsrcPath, kNuFileOpenWriteTrunc);
free(rsrcPath);
} else {
*pFp = fopen(pathnameUNI, kNuFileOpenWriteTrunc);
}
#else
*pFp = fopen(pathnameUNI, kNuFileOpenWriteTrunc);
#endif
if (*pFp == NULL)
return errno ? errno : -1;
return kNuErrNone;
}
/*
* Open an output file and prepare it for writing.
*
* There are a number of things to take into consideration, including
* deal with "file exists" conditions, handling Mac/IIgs file types,
* coping with resource forks on extended files, and handling the
* "freshen" option that requires us to only update files that are
* older than what we have.
*/
NuError Nu_OpenOutputFile(NuArchive* pArchive, const NuRecord* pRecord,
const NuThread* pThread, const UNICHAR* newPathnameUNI, UNICHAR newFssep,
FILE** pFp)
{
NuError err = kNuErrNone;
Boolean exists, isForkedFile, extractingRsrc = false;
NuFileInfo fileInfo;
NuErrorStatus errorStatus;
NuResult result;
Assert(pArchive != NULL);
Assert(pRecord != NULL);
Assert(pThread != NULL);
Assert(newPathnameUNI != NULL);
Assert(pFp != NULL);
/* set up some defaults, in case something goes wrong */
errorStatus.operation = kNuOpExtract;
errorStatus.err = kNuErrInternal;
errorStatus.sysErr = 0;
errorStatus.message = NULL;
errorStatus.pRecord = pRecord;
errorStatus.pathnameUNI = newPathnameUNI;
errorStatus.origPathname = NULL;
errorStatus.filenameSeparator = newFssep;
/*errorStatus.origArchiveTouched = false;*/
errorStatus.canAbort = true;
errorStatus.canRetry = true;
errorStatus.canIgnore = false;
errorStatus.canSkip = true;
errorStatus.canRename = true;
errorStatus.canOverwrite = true;
/* decide if this is a forked file (i.e. has *both* forks) */
isForkedFile = Nu_IsForkedFile(pArchive, pRecord);
/* decide if we're extracting a resource fork */
if (NuMakeThreadID(pThread->thThreadClass, pThread->thThreadKind) ==
kNuThreadIDRsrcFork)
{
extractingRsrc = true;
}
/*
* Determine whether the file and fork already exists. If the file
* is one we just created, and the fork we want to write to is
* empty, this will *not* set "exists".
*/
fileInfo.isValid = false;
err = Nu_FileForkExists(pArchive, newPathnameUNI, isForkedFile,
extractingRsrc, &exists, &fileInfo);
BailError(err);
if (exists) {
Assert(fileInfo.isValid == true);
/*
* The file exists when it shouldn't. Decide what to do, based
* on the options configured by the application.
*/
/*
* Start by checking to see if we're willing to overwrite older files.
* If not, see if the application wants to rename the file, or force
* the overwrite. Most likely they'll just want to skip it.
*/
if ((pArchive->valOnlyUpdateOlder) &&
!Nu_IsOlder(&fileInfo.modWhen, &pRecord->recModWhen))
{
if (pArchive->errorHandlerFunc != NULL) {
errorStatus.err = kNuErrNotNewer;
result = (*pArchive->errorHandlerFunc)(pArchive, &errorStatus);
switch (result) {
case kNuAbort:
err = kNuErrAborted;
goto bail;
case kNuRetry:
case kNuRename:
err = kNuErrRename;
goto bail;
case kNuSkip:
err = kNuErrSkipped;
goto bail;
case kNuOverwrite:
break; /* fall back into main code */
case kNuIgnore:
default:
err = kNuErrSyntax;
Nu_ReportError(NU_BLOB, err,
"Wasn't expecting result %d here", result);
goto bail;
}
} else {
err = kNuErrNotNewer;
goto bail;
}
}
/* If they "might" allow overwrites, and they have an error-handling
* callback defined, call that to find out what they want to do
* here. Options include skipping the file, overwriting the file,
* and extracting to a different file.
*/
if (pArchive->valHandleExisting == kNuMaybeOverwrite) {
if (pArchive->errorHandlerFunc != NULL) {
errorStatus.err = kNuErrFileExists;
result = (*pArchive->errorHandlerFunc)(pArchive, &errorStatus);
switch (result) {
case kNuAbort:
err = kNuErrAborted;
goto bail;
case kNuRetry:
case kNuRename:
err = kNuErrRename;
goto bail;
case kNuSkip:
err = kNuErrSkipped;
goto bail;
case kNuOverwrite:
break; /* fall back into main code */
case kNuIgnore:
default:
err = kNuErrSyntax;
Nu_ReportError(NU_BLOB, err,
"Wasn't expecting result %d here", result);
goto bail;
}
} else {
/* no error handler, return an error to the caller */
err = kNuErrFileExists;
goto bail;
}
} else if (pArchive->valHandleExisting == kNuNeverOverwrite) {
err = kNuErrSkipped;
goto bail;
}
} else {
/*
* The file doesn't exist. If we're doing a "freshen" from the
* archive, we don't want to create a new file, so we return an
* error to the user instead. However, we give the application
* a chance to straighten things out. Most likely they'll just
* return kNuSkip.
*/
if (pArchive->valHandleExisting == kNuMustOverwrite) {
DBUG(("+++ can't freshen nonexistent file '%s'\n", newPathnameUNI));
if (pArchive->errorHandlerFunc != NULL) {
errorStatus.err = kNuErrDuplicateNotFound;
/* give them a chance to rename */
result = (*pArchive->errorHandlerFunc)(pArchive, &errorStatus);
switch (result) {
case kNuAbort:
err = kNuErrAborted;
goto bail;
case kNuRetry:
case kNuRename:
err = kNuErrRename;
goto bail;
case kNuSkip:
err = kNuErrSkipped;
goto bail;
case kNuOverwrite:
break; /* fall back into main code */
case kNuIgnore:
default:
err = kNuErrSyntax;
Nu_ReportError(NU_BLOB, err,
"Wasn't expecting result %d here", result);
goto bail;
}
} else {
/* no error handler, return an error to the caller */
err = kNuErrDuplicateNotFound;
goto bail;
}
}
}
Assert(err == kNuErrNone);
/*
* After the above, if the file exists then we need to prepare it for
* writing. On some systems -- notably those with forked files -- it
* may be easiest to delete the entire file and start over. On
* simpler systems, an (optional) chmod followed by an open that
* truncates the file should be sufficient.
*
* If the file didn't exist, we need to be sure that the path leading
* up to its eventual location exists. This might require creating
* several directories. We distinguish the case of "file isn't there"
* from "file is there but fork isn't" by seeing if we were able to
* get valid file info.
*/
if (exists) {
Assert(fileInfo.isValid == true);
err = Nu_PrepareForWriting(pArchive, newPathnameUNI, extractingRsrc,
&fileInfo);
BailError(err);
} else if (!fileInfo.isValid) {
err = Nu_CreatePathIFN(pArchive, newPathnameUNI, newFssep);
BailError(err);
}
/*
* Open sesame.
*/
err = Nu_OpenFileForWrite(pArchive, newPathnameUNI, extractingRsrc, pFp);
BailError(err);
#if defined(HAS_RESOURCE_FORKS)
pArchive->lastFileCreatedUNI = newPathnameUNI;
#endif
bail:
if (err != kNuErrNone) {
if (err != kNuErrSkipped && err != kNuErrRename &&
err != kNuErrFileExists)
{
Nu_ReportError(NU_BLOB, err, "Unable to open '%s'%s",
newPathnameUNI, extractingRsrc ? " (rsrc fork)" : "");
}
}
return err;
}
/*
* Close the output file, adjusting the modification date and access
* permissions as needed.
*
* On GS/OS and Mac OS, we may need to set the file type here, depending on
* how much we managed to do when the file was first created. IIRC,
* the GS/OS Open call should allow setting the file type.
*
* BUG: on GS/OS, if we set the file access after writing the data fork,
* we may not be able to open the same file for writing the rsrc fork.
* We can't suppress setting the access permissions, because we don't know
* if the application will want to write both forks to the same file, or
* for that matter will want to write the resource fork at all. Looks
* like we will have to be smart enough to reset the access permissions
* when writing a rsrc fork to a file with just a data fork. This isn't
* quite right, but it's close enough.
*/
NuError Nu_CloseOutputFile(NuArchive* pArchive, const NuRecord* pRecord,
FILE* fp, const UNICHAR* pathnameUNI)
{
NuError err;
Assert(pArchive != NULL);
Assert(pRecord != NULL);
Assert(fp != NULL);
fclose(fp);
err = Nu_SetFileDates(pArchive, pRecord, pathnameUNI);
BailError(err);
#if defined(MAC_LIKE)
/* could also do this earlier and pass the fd for fsetxattr */
/* NOTE: must do this before Nu_SetFileAccess */
err = Nu_SetFinderInfo(pArchive, pRecord, pathnameUNI);
BailError(err);
#endif
err = Nu_SetFileAccess(pArchive, pRecord, pathnameUNI);
BailError(err);
bail:
return kNuErrNone;
}
/*
* ===========================================================================
* Open an input file
* ===========================================================================
*/
/*
* Open the file for reading, in "binary" mode when necessary.
*/
static NuError Nu_OpenFileForRead(NuArchive* pArchive,
const UNICHAR* pathnameUNI, Boolean openRsrc, FILE** pFp)
{
*pFp = fopen(pathnameUNI, kNuFileOpenReadOnly);
if (*pFp == NULL)
return errno ? errno : -1;
return kNuErrNone;
}
/*
* Open an input file and prepare it for reading.
*
* If the file can't be found, we give the application an opportunity to
* skip the absent file, retry, or abort the whole thing.
*/
NuError Nu_OpenInputFile(NuArchive* pArchive, const UNICHAR* pathnameUNI,
Boolean openRsrc, FILE** pFp)
{
NuError err = kNuErrNone;
NuError openErr = kNuErrNone;
NuErrorStatus errorStatus;
NuResult result;
Assert(pArchive != NULL);
Assert(pathnameUNI != NULL);
Assert(pFp != NULL);
#if defined(MAC_LIKE) && defined(HAS_RESOURCE_FORKS)
UNICHAR* rsrcPath = NULL;
if (openRsrc) {
rsrcPath = GetResourcePath(pathnameUNI);
pathnameUNI = rsrcPath;
}
#endif
retry:
/*
* Open sesame.
*/
err = Nu_OpenFileForRead(pArchive, pathnameUNI, openRsrc, pFp);
if (err == kNuErrNone) /* success! */
goto bail;
if (err == ENOENT)
openErr = kNuErrFileNotFound;
if (pArchive->errorHandlerFunc != NULL) {
errorStatus.operation = kNuOpAdd;
errorStatus.err = openErr;
errorStatus.sysErr = 0;
errorStatus.message = NULL;
errorStatus.pRecord = NULL;
errorStatus.pathnameUNI = pathnameUNI;
errorStatus.origPathname = NULL;
errorStatus.filenameSeparator = '\0';
/*errorStatus.origArchiveTouched = false;*/
errorStatus.canAbort = true;
errorStatus.canRetry = true;
errorStatus.canIgnore = false;
errorStatus.canSkip = true;
errorStatus.canRename = false;
errorStatus.canOverwrite = false;
DBUG(("--- invoking error handler function\n"));
result = (*pArchive->errorHandlerFunc)(pArchive, &errorStatus);
switch (result) {
case kNuAbort:
err = kNuErrAborted;
goto bail;
case kNuRetry:
goto retry;
case kNuSkip:
err = kNuErrSkipped;
goto bail;
case kNuRename:
case kNuOverwrite:
case kNuIgnore:
default:
err = kNuErrSyntax;
Nu_ReportError(NU_BLOB, err,
"Wasn't expecting result %d here", result);
goto bail;
}
} else {
DBUG(("+++ no error callback in OpenInputFile\n"));
}
bail:
if (err == kNuErrNone) {
Assert(*pFp != NULL);
} else {
if (err != kNuErrSkipped && err != kNuErrRename &&
err != kNuErrFileExists)
{
Nu_ReportError(NU_BLOB, err, "Unable to open '%s'%s",
pathnameUNI, openRsrc ? " (rsrc fork)" : "");
}
}
#if defined(MAC_LIKE) && defined(HAS_RESOURCE_FORKS)
free(rsrcPath);
#endif
return err;
}
/*
* ===========================================================================
* Delete and rename files
* ===========================================================================
*/
/*
* Delete a file.
*/
NuError Nu_DeleteFile(const UNICHAR* pathnameUNI)
{
#if defined(UNIX_LIKE) || defined(WINDOWS_LIKE)
int cc;
DBUG(("--- Deleting '%s'\n", pathnameUNI));
cc = unlink(pathnameUNI);
if (cc < 0)
return errno ? errno : -1;
else
return kNuErrNone;
#else
#error "Port this"
#endif
}
/*
* Rename a file from "fromPath" to "toPath".
*/
NuError Nu_RenameFile(const UNICHAR* fromPathUNI, const UNICHAR* toPathUNI)
{
#if defined(UNIX_LIKE) || defined(WINDOWS_LIKE)
int cc;
DBUG(("--- Renaming '%s' to '%s'\n", fromPathUNI, toPathUNI));
cc = rename(fromPathUNI, toPathUNI);
if (cc < 0)
return errno ? errno : -1;
else
return kNuErrNone;
#else
#error "Port this"
#endif
}
/*
* ===========================================================================
* NuError wrappers for std functions
* ===========================================================================
*/
/*
* Wrapper for ftell().
*/
NuError Nu_FTell(FILE* fp, long* pOffset)
{
Assert(fp != NULL);
Assert(pOffset != NULL);
errno = 0;
*pOffset = ftell(fp);
if (*pOffset < 0) {
Nu_ReportError(NU_NILBLOB, errno, "file ftell failed");
return errno ? errno : kNuErrFileSeek;
}
return kNuErrNone;
}
/*
* Wrapper for fseek().
*/
NuError Nu_FSeek(FILE* fp, long offset, int ptrname)
{
Assert(fp != NULL);
Assert(ptrname == SEEK_SET || ptrname == SEEK_CUR || ptrname == SEEK_END);
errno = 0;
if (fseek(fp, offset, ptrname) < 0) {
Nu_ReportError(NU_NILBLOB, errno,
"file fseek(%ld, %d) failed", offset, ptrname);
return errno ? errno : kNuErrFileSeek;
}
return kNuErrNone;
}
/*
* Wrapper for fread(). Note the arguments resemble read(2) rather than the
* slightly silly ones used by fread(3S).
*/
NuError Nu_FRead(FILE* fp, void* buf, size_t nbyte)
{
size_t result;
errno = 0;
result = fread(buf, nbyte, 1, fp);
if (result != 1)
return errno ? errno : kNuErrFileRead;
return kNuErrNone;
}
/*
* Wrapper for fwrite(). Note the arguments resemble write(2) rather than the
* slightly silly ones used by fwrite(3S).
*/
NuError Nu_FWrite(FILE* fp, const void* buf, size_t nbyte)
{
size_t result;
errno = 0;
result = fwrite(buf, nbyte, 1, fp);
if (result != 1)
return errno ? errno : kNuErrFileWrite;
return kNuErrNone;
}
/*
* ===========================================================================
* Misc functions
* ===========================================================================
*/
/*
* Copy a section from one file to another.
*/
NuError Nu_CopyFileSection(NuArchive* pArchive, FILE* dstFp, FILE* srcFp,
long length)
{
NuError err;
long readLen;
Assert(pArchive != NULL);
Assert(dstFp != NULL);
Assert(srcFp != NULL);
Assert(length >= 0); /* can be == 0, e.g. empty data fork from HFS */
/* nice big buffer, for speed... could use getc/putc for simplicity */
err = Nu_AllocCompressionBufferIFN(pArchive);
BailError(err);
DBUG(("+++ Copying %ld bytes\n", length));
while (length) {
readLen = length > kNuGenCompBufSize ? kNuGenCompBufSize : length;
err = Nu_FRead(srcFp, pArchive->compBuf, readLen);
if (err != kNuErrNone) {
Nu_ReportError(NU_BLOB, err,
"Nu_FRead failed while copying file section "
"(fp=0x%08lx, readLen=%ld, length=%ld, err=%d)\n",
(long) srcFp, readLen, length, err);
goto bail;
}
err = Nu_FWrite(dstFp, pArchive->compBuf, readLen);
BailError(err);
length -= readLen;
}
bail:
return err;
}
/*
* Find the length of an open file.
*
* On UNIX it would be easier to just call fstat(), but fseek is portable.
*
* Only useful for files < 2GB in size.
*
* (pArchive is only used for BailError message reporting, so it's okay
* to call here with a NULL pointer if the archive isn't open yet.)
*/
NuError Nu_GetFileLength(NuArchive* pArchive, FILE* fp, long* pLength)
{
NuError err;
long oldpos;
Assert(fp != NULL);
Assert(pLength != NULL);
err = Nu_FTell(fp, &oldpos);
BailError(err);
err = Nu_FSeek(fp, 0, SEEK_END);
BailError(err);
err = Nu_FTell(fp, pLength);
BailError(err);
err = Nu_FSeek(fp, oldpos, SEEK_SET);
BailError(err);
bail:
return err;
}
/*
* Truncate an open file. This differs from ftruncate() in that it takes
* a FILE* instead of an fd, and the length is a long instead of off_t.
*/
NuError Nu_TruncateOpenFile(FILE* fp, long length)
{
#if defined(HAVE_FTRUNCATE)
if (ftruncate(fileno(fp), length) < 0)
return errno ? errno : -1;
return kNuErrNone;
#elif defined(HAVE_CHSIZE)
if (chsize(fileno(fp), length) < 0)
return errno ? errno : -1;
return kNuErrNone;
#else
/* not fatal; return this to indicate that it's an unsupported operation */
return kNuErrInternal;
#endif
}
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