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physfs/archivers/zip.c

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/*
* ZIP support routines for PhysicsFS.
*
* Please see the file LICENSE in the source's root directory.
*
* This file written by Ryan C. Gordon.
*/
/*
* !!! FIXME: overall design bugs.
*
* It'd be nice if we could remove the thread issues: I/O to individual
* files inside an archive are safe, but the searches over the central
* directory and the ZIP_openRead() call are race conditions. Basically,
* we need to hack something like openDir() into unzip.c, so that directory
* reads are separated by handles, and maybe add a openFileByName() call,
* or make unzOpenCurrentFile() take a handle, too.
*
* Make unz_file_info.version into two fields of unsigned char. That's what
* they are in the zipfile; heavens knows why unzip.c casts it...this causes
* a byte ordering headache for me in entry_is_symlink().
*
* Maybe add a seekToStartOfCurrentFile() in unzip.c if complete seek
* semantics are impossible.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include "physfs.h"
#include "unzip.h"
#define __PHYSICSFS_INTERNAL__
#include "physfs_internal.h"
#if (!defined PHYSFS_SUPPORTS_ZIP)
#error PHYSFS_SUPPORTS_ZIP must be defined.
#endif
#define MAXZIPENTRYSIZE 256
typedef struct
{
unzFile handle;
uLong totalEntries;
char *archiveName;
} ZIPinfo;
typedef struct
{
unzFile handle;
} ZIPfileinfo;
extern const DirFunctions __PHYSFS_DirFunctions_ZIP;
static const FileFunctions __PHYSFS_FileFunctions_ZIP;
static int ZIP_read(FileHandle *handle, void *buffer,
unsigned int objSize, unsigned int objCount)
{
unzFile fh = ((ZIPfileinfo *) (handle->opaque))->handle;
int bytes = objSize * objCount;
int rc = unzReadCurrentFile(fh, buffer, bytes);
if (rc < bytes)
__PHYSFS_setError(ERR_PAST_EOF);
else if (rc == UNZ_ERRNO)
__PHYSFS_setError(ERR_IO_ERROR);
else if (rc < 0)
__PHYSFS_setError(ERR_COMPRESSION);
return(rc / objSize);
} /* ZIP_read */
static int ZIP_eof(FileHandle *handle)
{
return(unzeof(((ZIPfileinfo *) (handle->opaque))->handle));
} /* ZIP_eof */
static int ZIP_tell(FileHandle *handle)
{
return(unztell(((ZIPfileinfo *) (handle->opaque))->handle));
} /* ZIP_tell */
static int ZIP_fileLength(FileHandle *handle);
static int ZIP_seek(FileHandle *handle, int offset)
{
/* this blows. */
unzFile fh = ((ZIPfileinfo *) (handle->opaque))->handle;
char *buf;
int bufsize = 4096 * 2;
BAIL_IF_MACRO(unztell(fh) == offset, NULL, 1);
BAIL_IF_MACRO(ZIP_fileLength(handle) <= offset, ERR_PAST_EOF, 0);
/* reset to the start of the zipfile. */
unzCloseCurrentFile(fh);
BAIL_IF_MACRO(unzOpenCurrentFile(fh) != UNZ_OK, ERR_IO_ERROR, 0);
while ((buf == NULL) && (bufsize >= 512))
{
bufsize >>= 1; /* divides by two. */
buf = (char *) malloc(bufsize);
} /* while */
BAIL_IF_MACRO(buf == NULL, ERR_OUT_OF_MEMORY, 0);
while (offset > 0)
{
int chunk = (offset > bufsize) ? bufsize : offset;
int rc = unzReadCurrentFile(fh, buf, chunk);
BAIL_IF_MACRO(rc == 0, ERR_IO_ERROR, 0); /* shouldn't happen. */
BAIL_IF_MACRO(rc == UNZ_ERRNO, ERR_IO_ERROR, 0);
BAIL_IF_MACRO(rc < 0, ERR_COMPRESSION, 0);
offset -= rc;
} /* while */
free(buf);
return(offset == 0);
} /* ZIP_seek */
static int ZIP_fileLength(FileHandle *handle)
{
ZIPfileinfo *finfo = (ZIPfileinfo *) (handle->opaque);
unz_file_info info;
unzGetCurrentFileInfo(finfo->handle, &info, NULL, 0, NULL, 0, NULL, 0);
return(info.uncompressed_size);
} /* ZIP_fileLength */
static int ZIP_fileClose(FileHandle *handle)
{
ZIPfileinfo *finfo = (ZIPfileinfo *) (handle->opaque);
unzClose(finfo->handle);
free(finfo);
free(handle);
return(1);
} /* ZIP_fileClose */
static int ZIP_isArchive(const char *filename, int forWriting)
{
int retval = 0;
unzFile unz = unzOpen(filename);
unz_global_info global;
if (unz != NULL)
{
if (unzGetGlobalInfo(unz, &global) == UNZ_OK)
retval = 1;
unzClose(unz);
} /* if */
return(retval);
} /* ZIP_isArchive */
static DirHandle *ZIP_openArchive(const char *name, int forWriting)
{
unzFile unz = NULL;
DirHandle *retval = NULL;
unz_global_info global;
BAIL_IF_MACRO(forWriting, ERR_ARC_IS_READ_ONLY, NULL);
errno = 0;
BAIL_IF_MACRO(access(name, R_OK) != 0, strerror(errno), NULL);
retval = malloc(sizeof (DirHandle));
BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);
unz = unzOpen(name);
if ((unz == NULL) || (unzGetGlobalInfo(unz, &global) != UNZ_OK))
{
if (unz)
unzClose(unz);
free(retval);
BAIL_IF_MACRO(1, ERR_UNSUPPORTED_ARCHIVE, NULL);
} /* if */
retval->opaque = malloc(sizeof (ZIPinfo));
if (retval->opaque == NULL)
{
free(retval);
unzClose(unz);
BAIL_IF_MACRO(1, ERR_OUT_OF_MEMORY, NULL);
} /* if */
((ZIPinfo *) (retval->opaque))->archiveName = malloc(strlen(name) + 1);
if (((ZIPinfo *) (retval->opaque))->archiveName == NULL)
{
free(retval->opaque);
free(retval);
unzClose(unz);
BAIL_IF_MACRO(1, ERR_OUT_OF_MEMORY, NULL);
} /* if */
((ZIPinfo *) (retval->opaque))->handle = unz;
((ZIPinfo *) (retval->opaque))->totalEntries = global.number_entry;
strcpy(((ZIPinfo *) (retval->opaque))->archiveName, name);
retval->funcs = &__PHYSFS_DirFunctions_ZIP;
return(retval);
} /* ZIP_openArchive */
/* "uLong" is defined by zlib and/or unzip.h ... */
typedef union
{
unsigned char uchar4[4];
uLong ul;
} uchar4_uLong;
static int version_does_symlinks(uLong version)
{
int retval = 0;
unsigned char hosttype;
uchar4_uLong converter;
converter.ul = version;
hosttype = converter.uchar4[1]; /* !!! BYTE ORDERING ALERT! */
/*
* These are the platforms that can build an archive with symlinks,
* according to the Info-ZIP project.
*/
switch (hosttype)
{
case 3: /* Unix */
case 16: /* BeOS */
case 5: /* Atari */
retval = 1;
break;
} /* switch */
return(retval);
} /* version_does_symlinks */
static int entry_is_symlink(unz_file_info *info)
{
return (
(version_does_symlinks(info->version)) &&
(info->uncompressed_size > 0) &&
(info->external_fa & 0x0120000) /* symlink flag. */
);
} /* entry_is_symlink */
static char *ZIP_realpath(unzFile fh, unz_file_info *info)
{
char *retval = NULL;
int size;
if (entry_is_symlink(info))
{
BAIL_IF_MACRO(unzOpenCurrentFile(fh) != UNZ_OK, ERR_IO_ERROR, NULL);
size = info->uncompressed_size;
retval = (char *) malloc(size + 1);
BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);
if (unzReadCurrentFile(fh, retval, size) != size)
{
free(retval);
__PHYSFS_setError(ERR_IO_ERROR);
retval = NULL;
} /* if */
retval[size] = '\0';
unzCloseCurrentFile(fh);
} /* if */
return(retval);
} /* ZIP_realpath */
/* !!! This is seriously ugly. */
static LinkedStringList *ZIP_enumerateFiles(DirHandle *h,
const char *dirname,
int omitSymLinks)
{
ZIPinfo *zi = (ZIPinfo *) (h->opaque);
unzFile fh = zi->handle;
int i;
int dlen;
LinkedStringList *retval = NULL;
LinkedStringList *l = NULL;
LinkedStringList *prev = NULL;
char buf[MAXZIPENTRYSIZE];
char *d;
unz_file_info info;
/* jump to first file entry... */
BAIL_IF_MACRO(unzGoToFirstFile(fh) != UNZ_OK, ERR_IO_ERROR, NULL);
dlen = strlen(dirname);
d = malloc(dlen + 1);
BAIL_IF_MACRO(d == NULL, ERR_OUT_OF_MEMORY, NULL);
strcpy(d, dirname);
if ((dlen > 0) && (d[dlen - 1] == '/')) /* no trailing slash. */
{
dlen--;
d[dlen] = '\0';
} /* if */
for (i = 0; i < zi->totalEntries; i++, unzGoToNextFile(fh))
{
char *ptr;
char *add_file;
int this_dlen;
unzGetCurrentFileInfo(fh, &info, buf, sizeof (buf), NULL, 0, NULL, 0);
if ((omitSymLinks) && (entry_is_symlink(&info)))
continue;
buf[sizeof (buf) - 1] = '\0'; /* safety. */
this_dlen = strlen(buf);
if ((this_dlen > 0) && (buf[this_dlen - 1] == '/')) /* no trailing slash. */
{
this_dlen--;
buf[this_dlen] = '\0';
} /* if */
if (this_dlen <= dlen) /* not in this dir. */
continue;
if (*d == '\0')
add_file = buf;
else
{
if (buf[dlen] != '/') /* can't be in same directory? */
continue;
buf[dlen] = '\0';
if (strcmp(d, buf) != 0) /* not same directory? */
continue;
add_file = buf + dlen + 1;
} /* else */
/* handle subdirectories... */
ptr = strchr(add_file, '/');
if (ptr != NULL)
{
LinkedStringList *j;
*ptr = '\0';
for (j = retval; j != NULL; j = j->next)
{
if (strcmp(j->str, ptr) == 0)
break;
} /* for */
if (j != NULL)
continue;
} /* if */
l = (LinkedStringList *) malloc(sizeof (LinkedStringList));
if (l == NULL)
break;
l->str = (char *) malloc(strlen(add_file) + 1);
if (l->str == NULL)
{
free(l);
break;
} /* if */
strcpy(l->str, add_file);
if (retval == NULL)
retval = l;
else
prev->next = l;
prev = l;
l->next = NULL;
} /* for */
free(d);
return(retval);
} /* ZIP_enumerateFiles */
/* !!! This is seriously ugly. */
static int ZIP_exists_symcheck(DirHandle *h, const char *name, int follow)
{
char buf[MAXZIPENTRYSIZE];
ZIPinfo *zi = (ZIPinfo *) (h->opaque);
unzFile fh = zi->handle;
int dlen;
char *d;
int i;
unz_file_info info;
BAIL_IF_MACRO(unzGoToFirstFile(fh) != UNZ_OK, ERR_IO_ERROR, 0);
dlen = strlen(name);
d = malloc(dlen + 1);
BAIL_IF_MACRO(d == NULL, ERR_OUT_OF_MEMORY, 0);
strcpy(d, name);
if ((dlen > 0) && (d[dlen - 1] == '/')) /* no trailing slash. */
{
dlen--;
d[dlen] = '\0';
} /* if */
for (i = 0; i < zi->totalEntries; i++, unzGoToNextFile(fh))
{
int this_dlen;
unzGetCurrentFileInfo(fh, &info, buf, sizeof (buf), NULL, 0, NULL, 0);
buf[sizeof (buf) - 1] = '\0'; /* safety. */
this_dlen = strlen(buf);
if ((this_dlen > 0) && (buf[this_dlen - 1] == '/')) /* no trailing slash. */
{
this_dlen--;
buf[this_dlen] = '\0';
} /* if */
if ( ((buf[dlen] == '/') || (buf[dlen] == '\0')) &&
(strncmp(d, buf, dlen) == 0) )
{
int retval = 1;
free(d);
if (follow) /* follow symlinks? */
{
char *real = ZIP_realpath(fh, &info);
if (real != NULL)
{
retval = ZIP_exists_symcheck(h, real, follow - 1);
free(real);
} /* if */
} /* if */
return(retval);
} /* if */
} /* for */
free(d);
return(0);
} /* ZIP_exists_symcheck */
static int ZIP_exists_nofollow(DirHandle *h, const char *name)
{
return(ZIP_exists_symcheck(h, name, 0));
} /* ZIP_exists_nofollow */
static int ZIP_exists(DirHandle *h, const char *name)
{
/* follow at most 20 links to prevent recursion... */
int retval = ZIP_exists_symcheck(h, name, 20);
unz_file_info info;
unzFile fh = ((ZIPinfo *) (h->opaque))->handle;
if (retval)
{
/* current zip entry will be the file in question. */
unzGetCurrentFileInfo(fh, &info, NULL, 0, NULL, 0, NULL, 0);
/* if it's a symlink, then we ran into a possible symlink loop. */
BAIL_IF_MACRO(entry_is_symlink(&info), ERR_TOO_MANY_SYMLINKS, 0);
} /* if */
return(retval);
} /* ZIP_exists */
static int ZIP_isDirectory(DirHandle *h, const char *name)
{
char buf[MAXZIPENTRYSIZE];
unzFile fh = ((ZIPinfo *) (h->opaque))->handle;
int retval = ZIP_exists(h, name);
int dlen = strlen(name);
if (retval)
{
/* current zip entry will be the file in question. */
unzGetCurrentFileInfo(fh, NULL, buf, sizeof (buf), NULL, 0, NULL, 0);
retval = (buf[dlen] == '/'); /* !!! yikes. */
} /* if */
return(retval);
} /* ZIP_isDirectory */
static int ZIP_isSymLink(DirHandle *h, const char *name)
{
unzFile fh = ((ZIPinfo *) (h->opaque))->handle;
int retval = ZIP_exists_nofollow(h, name);
unz_file_info info;
if (retval)
{
/* current zip entry will be the file in question. */
unzGetCurrentFileInfo(fh, &info, NULL, 0, NULL, 0, NULL, 0);
retval = entry_is_symlink(&info);
} /* if */
return(retval);
} /* ZIP_isSymLink */
static FileHandle *ZIP_openRead(DirHandle *h, const char *filename)
{
FileHandle *retval = NULL;
ZIPfileinfo *finfo = NULL;
char *name = ((ZIPinfo *) (h->opaque))->archiveName;
unzFile f;
BAIL_IF_MACRO(!ZIP_exists(h, filename), ERR_NO_SUCH_FILE, NULL);
f = unzOpen(name);
BAIL_IF_MACRO(f == NULL, ERR_IO_ERROR, NULL);
if ( (unzLocateFile(f, filename, 1) != UNZ_OK) ||
( (finfo = (ZIPfileinfo *) malloc(sizeof (ZIPfileinfo))) == NULL ) ||
(unzOpenCurrentFile(f) != UNZ_OK) )
{
unzClose(f);
BAIL_IF_MACRO(1, ERR_IO_ERROR, NULL);
} /* if */
finfo->handle = f;
retval->opaque = (void *) finfo;
retval->funcs = &__PHYSFS_FileFunctions_ZIP;
retval->dirHandle = h;
return(retval);
} /* ZIP_openRead */
static void ZIP_dirClose(DirHandle *h)
{
unzClose(((ZIPinfo *) (h->opaque))->handle);
free(h->opaque);
free(h);
} /* ZIP_dirClose */
static const FileFunctions __PHYSFS_FileFunctions_ZIP =
{
ZIP_read, /* read() method */
NULL, /* write() method */
ZIP_eof, /* eof() method */
ZIP_tell, /* tell() method */
ZIP_seek, /* seek() method */
ZIP_fileLength, /* fileLength() method */
ZIP_fileClose /* fileClose() method */
};
const DirFunctions __PHYSFS_DirFunctions_ZIP =
{
ZIP_isArchive, /* isArchive() method */
ZIP_openArchive, /* openArchive() method */
ZIP_enumerateFiles, /* enumerateFiles() method */
ZIP_exists, /* exists() method */
ZIP_isDirectory, /* isDirectory() method */
ZIP_isSymLink, /* isSymLink() method */
ZIP_openRead, /* openRead() method */
NULL, /* openWrite() method */
NULL, /* openAppend() method */
NULL, /* remove() method */
NULL, /* mkdir() method */
ZIP_dirClose /* dirClose() method */
};
const PHYSFS_ArchiveInfo __PHYSFS_ArchiveInfo_ZIP =
{
"ZIP",
"PkZip/WinZip/Info-Zip compatible",
"Ryan C. Gordon (icculus@linuxgames.com)",
"http://www.icculus.org/~icculus/",
};
/* end of zip.c ... */
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