src/archiver_dir.c
author Ryan C. Gordon <icculus@icculus.org>
Tue, 20 Mar 2012 15:38:12 -0400
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parent 1226 3ea51c799aba
child 1241 86dd9db48c76
permissions -rw-r--r--
Reworked the error reporting API. Now we use error codes instead of strings. This is based on work originally done by Christoph Nelles.
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/*
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 * Standard directory I/O support routines for PhysicsFS.
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 *
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 * Please see the file LICENSE.txt in the source's root directory.
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 *
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 *  This file written by Ryan C. Gordon.
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 */
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#define __PHYSICSFS_INTERNAL__
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#include "physfs_internal.h"
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/* There's no PHYSFS_Io interface here. Use __PHYSFS_createNativeIo(). */
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static char *cvtToDependent(const char *prepend, const char *path, char *buf)
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{
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    BAIL_IF_MACRO(buf == NULL, PHYSFS_ERR_OUT_OF_MEMORY, NULL);
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    sprintf(buf, "%s%s", prepend ? prepend : "", path);
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    if (__PHYSFS_platformDirSeparator != '/')
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    {
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        char *p;
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        for (p = strchr(buf, '/'); p != NULL; p = strchr(p + 1, '/'))
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            *p = __PHYSFS_platformDirSeparator;
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    } /* if */
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    return buf;
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} /* cvtToDependent */
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#define CVT_TO_DEPENDENT(buf, pre, dir) { \
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    const size_t len = ((pre) ? strlen((char *) pre) : 0) + strlen(dir) + 1; \
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    buf = cvtToDependent((char*)pre,dir,(char*)__PHYSFS_smallAlloc(len)); \
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}
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static void *DIR_openArchive(PHYSFS_Io *io, const char *name, int forWriting)
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{
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    PHYSFS_Stat st;
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    const char dirsep = __PHYSFS_platformDirSeparator;
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    char *retval = NULL;
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    const size_t namelen = strlen(name);
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    const size_t seplen = 1;
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    int exists = 0;
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    assert(io == NULL);  /* shouldn't create an Io for these. */
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    BAIL_IF_MACRO(!__PHYSFS_platformStat(name, &exists, &st), ERRPASS, NULL);
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    /* !!! FIXME: the failed Stat() call will BAIL before we check (exists) */
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    /* !!! FIXME:  ...should we even be checking for existance here...? */
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    BAIL_IF_MACRO(!exists, PHYSFS_ERR_NO_SUCH_PATH, NULL);
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    if (st.filetype != PHYSFS_FILETYPE_DIRECTORY)
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        BAIL_MACRO(PHYSFS_ERR_UNSUPPORTED, NULL);
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    retval = allocator.Malloc(namelen + seplen + 1);
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    BAIL_IF_MACRO(retval == NULL, PHYSFS_ERR_OUT_OF_MEMORY, NULL);
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    strcpy(retval, name);
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    /* make sure there's a dir separator at the end of the string */
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    if (retval[namelen - 1] != dirsep)
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    {
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        retval[namelen] = dirsep;
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        retval[namelen + 1] = '\0';
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    } /* if */
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    return retval;
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} /* DIR_openArchive */
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static void DIR_enumerateFiles(dvoid *opaque, const char *dname,
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                               int omitSymLinks, PHYSFS_EnumFilesCallback cb,
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                               const char *origdir, void *callbackdata)
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{
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    char *d;
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    CVT_TO_DEPENDENT(d, opaque, dname);
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    if (d != NULL)
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    {
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        __PHYSFS_platformEnumerateFiles(d, omitSymLinks, cb,
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                                        origdir, callbackdata);
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        __PHYSFS_smallFree(d);
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    } /* if */
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} /* DIR_enumerateFiles */
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static PHYSFS_Io *doOpen(dvoid *opaque, const char *name,
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                         const int mode, int *fileExists)
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{
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    char *f;
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    PHYSFS_Io *io = NULL;
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    int existtmp = 0;
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    CVT_TO_DEPENDENT(f, opaque, name);
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    BAIL_IF_MACRO(!f, ERRPASS, NULL);
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    if (fileExists == NULL)
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        fileExists = &existtmp;
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    io = __PHYSFS_createNativeIo(f, mode);
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    if (io == NULL)
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    {
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        PHYSFS_Stat statbuf;  /* !!! FIXME: this changes the error message. */
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        __PHYSFS_platformStat(f, fileExists, &statbuf);
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    } /* if */
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    else
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    {
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        *fileExists = 1;
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    } /* else */
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    __PHYSFS_smallFree(f);
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    return io;
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} /* doOpen */
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static PHYSFS_Io *DIR_openRead(dvoid *opaque, const char *fnm, int *exist)
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{
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    return doOpen(opaque, fnm, 'r', exist);
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} /* DIR_openRead */
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static PHYSFS_Io *DIR_openWrite(dvoid *opaque, const char *filename)
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{
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    return doOpen(opaque, filename, 'w', NULL);
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} /* DIR_openWrite */
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static PHYSFS_Io *DIR_openAppend(dvoid *opaque, const char *filename)
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{
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    return doOpen(opaque, filename, 'a', NULL);
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} /* DIR_openAppend */
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static int DIR_remove(dvoid *opaque, const char *name)
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{
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    int retval;
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    char *f;
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    CVT_TO_DEPENDENT(f, opaque, name);
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    BAIL_IF_MACRO(!f, ERRPASS, 0);
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    retval = __PHYSFS_platformDelete(f);
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    __PHYSFS_smallFree(f);
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    return retval;
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} /* DIR_remove */
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static int DIR_mkdir(dvoid *opaque, const char *name)
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{
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    int retval;
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    char *f;
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    CVT_TO_DEPENDENT(f, opaque, name);
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    BAIL_IF_MACRO(!f, ERRPASS, 0);
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    retval = __PHYSFS_platformMkDir(f);
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    __PHYSFS_smallFree(f);
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    return retval;
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} /* DIR_mkdir */
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static void DIR_dirClose(dvoid *opaque)
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{
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    allocator.Free(opaque);
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} /* DIR_dirClose */
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static int DIR_stat(dvoid *opaque, const char *name, int *exists,
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                    PHYSFS_Stat *stat)
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{
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    int retval = 0;
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    char *d;
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    CVT_TO_DEPENDENT(d, opaque, name);
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    BAIL_IF_MACRO(!d, ERRPASS, 0);
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    retval = __PHYSFS_platformStat(d, exists, stat);
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    __PHYSFS_smallFree(d);
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    return retval;
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} /* DIR_stat */
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const PHYSFS_ArchiveInfo __PHYSFS_ArchiveInfo_DIR =
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{
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    "",
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    DIR_ARCHIVE_DESCRIPTION,
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    "Ryan C. Gordon <icculus@icculus.org>",
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    "http://icculus.org/physfs/",
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};
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const PHYSFS_Archiver __PHYSFS_Archiver_DIR =
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{
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    &__PHYSFS_ArchiveInfo_DIR,
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    DIR_openArchive,        /* openArchive() method    */
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    DIR_enumerateFiles,     /* enumerateFiles() method */
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    DIR_openRead,           /* openRead() method       */
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    DIR_openWrite,          /* openWrite() method      */
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    DIR_openAppend,         /* openAppend() method     */
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    DIR_remove,             /* remove() method         */
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    DIR_mkdir,              /* mkdir() method          */
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    DIR_dirClose,           /* dirClose() method       */
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    DIR_stat                /* stat() method           */
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};
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/* end of dir.c ... */
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