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physfs/archivers/qpak.c

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/*
* QPAK support routines for PhysicsFS.
*
* This archiver handles the archive format utilized by Quake 1 and 2.
* Quake3-based games use the PkZip/Info-Zip format (which our zip.c
* archiver handles).
*
* ========================================================================
*
* This format info (in more detail) comes from:
* http://debian.fmi.uni-sofia.bg/~sergei/cgsr/docs/pak.txt
*
* Quake PAK Format
*
* Header
* (4 bytes) signature = 'PACK'
* (4 bytes) directory offset
* (4 bytes) directory length
*
* Directory
* (56 bytes) file name
* (4 bytes) file position
* (4 bytes) file length
*
* ========================================================================
*
* Please see the file LICENSE in the source's root directory.
*
* This file written by Ryan C. Gordon.
*/
#if HAVE_CONFIG_H
# include <config.h>
#endif
#if (defined PHYSFS_SUPPORTS_QPAK)
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "physfs.h"
#define __PHYSICSFS_INTERNAL__
#include "physfs_internal.h"
typedef struct
{
char name[56];
PHYSFS_uint32 startPos;
PHYSFS_uint32 size;
} QPAKentry;
typedef struct
{
char *filename;
PHYSFS_sint64 last_mod_time;
PHYSFS_uint32 entryCount;
QPAKentry *entries;
} QPAKinfo;
typedef struct
{
void *handle;
QPAKentry *entry;
PHYSFS_uint32 curPos;
} QPAKfileinfo;
/* Magic numbers... */
#define QPAK_SIGNATURE 0x4b434150 /* "PACK" in ASCII. */
static void QPAK_dirClose(DirHandle *h);
static PHYSFS_sint64 QPAK_read(FileHandle *handle, void *buffer,
PHYSFS_uint32 objSize, PHYSFS_uint32 objCount);
static PHYSFS_sint64 QPAK_write(FileHandle *handle, const void *buffer,
PHYSFS_uint32 objSize, PHYSFS_uint32 objCount);
static int QPAK_eof(FileHandle *handle);
static PHYSFS_sint64 QPAK_tell(FileHandle *handle);
static int QPAK_seek(FileHandle *handle, PHYSFS_uint64 offset);
static PHYSFS_sint64 QPAK_fileLength(FileHandle *handle);
static int QPAK_fileClose(FileHandle *handle);
static int QPAK_isArchive(const char *filename, int forWriting);
static DirHandle *QPAK_openArchive(const char *name, int forWriting);
static LinkedStringList *QPAK_enumerateFiles(DirHandle *h,
const char *dirname,
int omitSymLinks);
static int QPAK_exists(DirHandle *h, const char *name);
static int QPAK_isDirectory(DirHandle *h, const char *name, int *fileExists);
static int QPAK_isSymLink(DirHandle *h, const char *name, int *fileExists);
static PHYSFS_sint64 QPAK_getLastModTime(DirHandle *h, const char *n, int *e);
static FileHandle *QPAK_openRead(DirHandle *h, const char *name, int *exist);
static FileHandle *QPAK_openWrite(DirHandle *h, const char *name);
static FileHandle *QPAK_openAppend(DirHandle *h, const char *name);
static int QPAK_remove(DirHandle *h, const char *name);
static int QPAK_mkdir(DirHandle *h, const char *name);
const PHYSFS_ArchiveInfo __PHYSFS_ArchiveInfo_QPAK =
{
"PAK",
QPAK_ARCHIVE_DESCRIPTION,
"Ryan C. Gordon <icculus@clutteredmind.org>",
"http://icculus.org/physfs/",
};
static const FileFunctions __PHYSFS_FileFunctions_QPAK =
{
QPAK_read, /* read() method */
QPAK_write, /* write() method */
QPAK_eof, /* eof() method */
QPAK_tell, /* tell() method */
QPAK_seek, /* seek() method */
QPAK_fileLength, /* fileLength() method */
QPAK_fileClose /* fileClose() method */
};
const DirFunctions __PHYSFS_DirFunctions_QPAK =
{
&__PHYSFS_ArchiveInfo_QPAK,
QPAK_isArchive, /* isArchive() method */
QPAK_openArchive, /* openArchive() method */
QPAK_enumerateFiles, /* enumerateFiles() method */
QPAK_exists, /* exists() method */
QPAK_isDirectory, /* isDirectory() method */
QPAK_isSymLink, /* isSymLink() method */
QPAK_getLastModTime, /* getLastModTime() method */
QPAK_openRead, /* openRead() method */
QPAK_openWrite, /* openWrite() method */
QPAK_openAppend, /* openAppend() method */
QPAK_remove, /* remove() method */
QPAK_mkdir, /* mkdir() method */
QPAK_dirClose /* dirClose() method */
};
static void QPAK_dirClose(DirHandle *h)
{
QPAKinfo *info = ((QPAKinfo *) h->opaque);
free(info->filename);
free(info->entries);
free(info);
free(h);
} /* QPAK_dirClose */
static PHYSFS_sint64 QPAK_read(FileHandle *handle, void *buffer,
PHYSFS_uint32 objSize, PHYSFS_uint32 objCount)
{
QPAKfileinfo *finfo = (QPAKfileinfo *) (handle->opaque);
QPAKentry *entry = finfo->entry;
PHYSFS_uint32 bytesLeft = entry->size - finfo->curPos;
PHYSFS_uint32 objsLeft = (bytesLeft / objSize);
PHYSFS_sint64 rc;
if (objsLeft < objCount)
objCount = objsLeft;
rc = __PHYSFS_platformRead(finfo->handle, buffer, objSize, objCount);
if (rc > 0)
finfo->curPos += (PHYSFS_uint32) (rc * objSize);
return(rc);
} /* QPAK_read */
static PHYSFS_sint64 QPAK_write(FileHandle *handle, const void *buffer,
PHYSFS_uint32 objSize, PHYSFS_uint32 objCount)
{
BAIL_MACRO(ERR_NOT_SUPPORTED, -1);
} /* QPAK_write */
static int QPAK_eof(FileHandle *handle)
{
QPAKfileinfo *finfo = (QPAKfileinfo *) (handle->opaque);
QPAKentry *entry = finfo->entry;
return(finfo->curPos >= entry->size);
} /* QPAK_eof */
static PHYSFS_sint64 QPAK_tell(FileHandle *handle)
{
return(((QPAKfileinfo *) (handle->opaque))->curPos);
} /* QPAK_tell */
static int QPAK_seek(FileHandle *handle, PHYSFS_uint64 offset)
{
QPAKfileinfo *finfo = (QPAKfileinfo *) (handle->opaque);
QPAKentry *entry = finfo->entry;
int rc;
BAIL_IF_MACRO(offset < 0, ERR_INVALID_ARGUMENT, 0);
BAIL_IF_MACRO(offset >= entry->size, ERR_PAST_EOF, 0);
rc = __PHYSFS_platformSeek(finfo->handle, entry->startPos + offset);
if (rc)
finfo->curPos = (PHYSFS_uint32) offset;
return(rc);
} /* QPAK_seek */
static PHYSFS_sint64 QPAK_fileLength(FileHandle *handle)
{
QPAKfileinfo *finfo = ((QPAKfileinfo *) handle->opaque);
return((PHYSFS_sint64) finfo->entry->size);
} /* QPAK_fileLength */
static int QPAK_fileClose(FileHandle *handle)
{
QPAKfileinfo *finfo = ((QPAKfileinfo *) handle->opaque);
BAIL_IF_MACRO(!__PHYSFS_platformClose(finfo->handle), NULL, 0);
free(finfo);
free(handle);
return(1);
} /* QPAK_fileClose */
static int qpak_open(const char *filename, int forWriting,
void **fh, PHYSFS_uint32 *count)
{
PHYSFS_uint32 buf;
*fh = NULL;
BAIL_IF_MACRO(forWriting, ERR_ARC_IS_READ_ONLY, 0);
*fh = __PHYSFS_platformOpenRead(filename);
BAIL_IF_MACRO(*fh == NULL, NULL, 0);
if (__PHYSFS_platformRead(*fh, &buf, sizeof (PHYSFS_uint32), 1) != 1)
goto openQpak_failed;
buf = PHYSFS_swapULE32(buf);
if (buf != QPAK_SIGNATURE)
{
__PHYSFS_setError(ERR_UNSUPPORTED_ARCHIVE);
goto openQpak_failed;
} /* if */
if (__PHYSFS_platformRead(*fh, &buf, sizeof (PHYSFS_uint32), 1) != 1)
goto openQpak_failed;
buf = PHYSFS_swapULE32(buf); /* directory table offset. */
if (__PHYSFS_platformRead(*fh, count, sizeof (PHYSFS_uint32), 1) != 1)
goto openQpak_failed;
*count = PHYSFS_swapULE32(*count);
if ((*count % 64) != 0) /* corrupted archive? */
{
__PHYSFS_setError(ERR_CORRUPTED);
goto openQpak_failed;
} /* if */
if (!__PHYSFS_platformSeek(*fh, buf))
goto openQpak_failed;
*count /= 64;
return(1);
openQpak_failed:
if (*fh != NULL)
__PHYSFS_platformClose(*fh);
*count = -1;
*fh = NULL;
return(0);
} /* qpak_open */
static int QPAK_isArchive(const char *filename, int forWriting)
{
void *fh;
PHYSFS_uint32 fileCount;
int retval = qpak_open(filename, forWriting, &fh, &fileCount);
if (fh != NULL)
__PHYSFS_platformClose(fh);
return(retval);
} /* QPAK_isArchive */
static int qpak_entry_cmp(void *_a, PHYSFS_uint32 one, PHYSFS_uint32 two)
{
QPAKentry *a = (QPAKentry *) _a;
return(strcmp(a[one].name, a[two].name));
} /* qpak_entry_cmp */
static void qpak_entry_swap(void *_a, PHYSFS_uint32 one, PHYSFS_uint32 two)
{
QPAKentry tmp;
QPAKentry *first = &(((QPAKentry *) _a)[one]);
QPAKentry *second = &(((QPAKentry *) _a)[two]);
memcpy(&tmp, first, sizeof (QPAKentry));
memcpy(first, second, sizeof (QPAKentry));
memcpy(second, &tmp, sizeof (QPAKentry));
} /* qpak_entry_swap */
static int qpak_load_entries(const char *name, int forWriting, QPAKinfo *info)
{
void *fh = NULL;
PHYSFS_uint32 fileCount;
QPAKentry *entry;
char *ptr;
BAIL_IF_MACRO(!qpak_open(name, forWriting, &fh, &fileCount), NULL, 0);
info->entryCount = fileCount;
info->entries = (QPAKentry *) malloc(sizeof (QPAKentry) * fileCount);
if (info->entries == NULL)
{
__PHYSFS_platformClose(fh);
BAIL_MACRO(ERR_OUT_OF_MEMORY, 0);
} /* if */
for (entry = info->entries; fileCount > 0; fileCount--, entry++)
{
PHYSFS_uint32 loc;
if (__PHYSFS_platformRead(fh,&entry->name,sizeof(entry->name),1) != 1)
{
__PHYSFS_platformClose(fh);
return(0);
} /* if */
if (__PHYSFS_platformRead(fh,&loc,sizeof(loc),1) != 1)
{
__PHYSFS_platformClose(fh);
return(0);
} /* if */
if (__PHYSFS_platformRead(fh,&entry->size,sizeof(entry->size),1) != 1)
{
__PHYSFS_platformClose(fh);
return(0);
} /* if */
entry->size = PHYSFS_swapULE32(entry->size);
entry->startPos = PHYSFS_swapULE32(loc);
} /* for */
__PHYSFS_platformClose(fh);
__PHYSFS_sort(info->entries, info->entryCount,
qpak_entry_cmp, qpak_entry_swap);
return(1);
} /* qpak_load_entries */
static DirHandle *QPAK_openArchive(const char *name, int forWriting)
{
QPAKinfo *info;
DirHandle *retval = malloc(sizeof (DirHandle));
PHYSFS_sint64 modtime = __PHYSFS_platformGetLastModTime(name);
BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);
info = retval->opaque = malloc(sizeof (QPAKinfo));
if (info == NULL)
{
__PHYSFS_setError(ERR_OUT_OF_MEMORY);
goto QPAK_openArchive_failed;
} /* if */
memset(info, '\0', sizeof (QPAKinfo));
info->filename = (char *) malloc(strlen(name) + 1);
if (info->filename == NULL)
{
__PHYSFS_setError(ERR_OUT_OF_MEMORY);
goto QPAK_openArchive_failed;
} /* if */
if (!qpak_load_entries(name, forWriting, info))
goto QPAK_openArchive_failed;
strcpy(info->filename, name);
info->last_mod_time = modtime;
retval->funcs = &__PHYSFS_DirFunctions_QPAK;
return(retval);
QPAK_openArchive_failed:
if (retval != NULL)
{
if (retval->opaque != NULL)
{
if (info->filename != NULL)
free(info->filename);
if (info->entries != NULL)
free(info->entries);
free(info);
} /* if */
free(retval);
} /* if */
return(NULL);
} /* QPAK_openArchive */
static PHYSFS_sint32 qpak_find_start_of_dir(QPAKinfo *info, const char *path,
int stop_on_first_find)
{
PHYSFS_sint32 lo = 0;
PHYSFS_sint32 hi = (PHYSFS_sint32) (info->entryCount - 1);
PHYSFS_sint32 middle;
PHYSFS_uint32 dlen = strlen(path);
PHYSFS_sint32 retval = -1;
const char *name;
int rc;
if (*path == '\0') /* root dir? */
return(0);
if ((dlen > 0) && (path[dlen - 1] == '/')) /* ignore trailing slash. */
dlen--;
while (lo <= hi)
{
middle = lo + ((hi - lo) / 2);
name = info->entries[middle].name;
rc = strncmp(path, name, dlen);
if (rc == 0)
{
char ch = name[dlen];
if (ch < '/') /* make sure this isn't just a substr match. */
rc = -1;
else if (ch > '/')
rc = 1;
else
{
if (stop_on_first_find) /* Just checking dir's existance? */
return(middle);
if (name[dlen + 1] == '\0') /* Skip initial dir entry. */
return(middle + 1);
/* there might be more entries earlier in the list. */
retval = middle;
hi = middle - 1;
} /* else */
} /* if */
if (rc > 0)
lo = middle + 1;
else
hi = middle - 1;
} /* while */
return(retval);
} /* qpak_find_start_of_dir */
static LinkedStringList *QPAK_enumerateFiles(DirHandle *h,
const char *dirname,
int omitSymLinks)
{
QPAKinfo *info = ((QPAKinfo *) h->opaque);
LinkedStringList *retval = NULL, *p = NULL;
PHYSFS_sint32 dlen, dlen_inc, max, i;
i = qpak_find_start_of_dir(info, dirname, 0);
BAIL_IF_MACRO(i == -1, ERR_NO_SUCH_FILE, NULL);
dlen = strlen(dirname);
if ((dlen > 0) && (dirname[dlen - 1] == '/')) /* ignore trailing slash. */
dlen--;
dlen_inc = ((dlen > 0) ? 1 : 0) + dlen;
max = (PHYSFS_sint32) info->entryCount;
while (i < max)
{
char *add;
char *ptr;
PHYSFS_sint32 ln;
char *e = info->entries[i].name;
if ((dlen) && ((strncmp(e, dirname, dlen) != 0) || (e[dlen] != '/')))
break; /* past end of this dir; we're done. */
add = e + dlen_inc;
ptr = strchr(add, '/');
ln = (PHYSFS_sint32) ((ptr) ? ptr-add : strlen(add));
retval = __PHYSFS_addToLinkedStringList(retval, &p, add, ln);
ln += dlen_inc; /* point past entry to children... */
/* increment counter and skip children of subdirs... */
while ((++i < max) && (ptr != NULL))
{
char *e_new = info->entries[i].name;
if ((strncmp(e, e_new, ln) != 0) || (e_new[ln] != '/'))
break;
} /* while */
} /* while */
return(retval);
} /* QPAK_enumerateFiles */
/*
* This will find the QPAKentry associated with a path in platform-independent
* notation. Directories don't have QPAKentries associated with them, but
* (*isDir) will be set to non-zero if a dir was hit.
*/
static QPAKentry *qpak_find_entry(QPAKinfo *info, const char *path, int *isDir)
{
QPAKentry *a = info->entries;
PHYSFS_sint32 pathlen = strlen(path);
PHYSFS_sint32 lo = 0;
PHYSFS_sint32 hi = (PHYSFS_sint32) (info->entryCount - 1);
PHYSFS_sint32 middle;
const char *thispath = NULL;
int rc;
while (lo <= hi)
{
middle = lo + ((hi - lo) / 2);
thispath = a[middle].name;
rc = strncmp(path, thispath, pathlen);
if (rc > 0)
lo = middle + 1;
else if (rc < 0)
hi = middle - 1;
else /* substring match...might be dir or entry or nothing. */
{
if (isDir != NULL)
{
*isDir = (thispath[pathlen] == '/');
if (*isDir)
return(NULL);
} /* if */
if (thispath[pathlen] == '\0') /* found entry? */
return(&a[middle]);
else
hi = middle - 1; /* adjust search params, try again. */
} /* if */
} /* while */
if (isDir != NULL)
*isDir = 0;
BAIL_MACRO(ERR_NO_SUCH_FILE, NULL);
} /* qpak_find_entry */
static int QPAK_exists(DirHandle *h, const char *name)
{
int isDir;
QPAKinfo *info = (QPAKinfo *) h->opaque;
QPAKentry *entry = qpak_find_entry(info, name, &isDir);
return((entry != NULL) || (isDir));
} /* QPAK_exists */
static int QPAK_isDirectory(DirHandle *h, const char *name, int *fileExists)
{
QPAKinfo *info = (QPAKinfo *) h->opaque;
int isDir;
QPAKentry *entry = qpak_find_entry(info, name, &isDir);
*fileExists = ((isDir) || (entry != NULL));
if (isDir)
return(1); /* definitely a dir. */
BAIL_MACRO(ERR_NO_SUCH_FILE, 0);
} /* QPAK_isDirectory */
static int QPAK_isSymLink(DirHandle *h, const char *name, int *fileExists)
{
*fileExists = QPAK_exists(h, name);
return(0); /* never symlinks in a quake pak. */
} /* QPAK_isSymLink */
static PHYSFS_sint64 QPAK_getLastModTime(DirHandle *h,
const char *name,
int *fileExists)
{
int isDir;
QPAKinfo *info = ((QPAKinfo *) h->opaque);
PHYSFS_sint64 retval = -1;
QPAKentry *entry = qpak_find_entry(info, name, &isDir);
*fileExists = ((isDir) || (entry != NULL));
if (*fileExists) /* use time of QPAK itself in the physical filesystem. */
retval = info->last_mod_time;
return(retval);
} /* QPAK_getLastModTime */
static FileHandle *QPAK_openRead(DirHandle *h, const char *fnm, int *fileExists)
{
QPAKinfo *info = ((QPAKinfo *) h->opaque);
FileHandle *retval;
QPAKfileinfo *finfo;
QPAKentry *entry;
int isDir;
entry = qpak_find_entry(info, fnm, &isDir);
*fileExists = ((entry != NULL) || (isDir));
BAIL_IF_MACRO(isDir, ERR_NOT_A_FILE, NULL);
BAIL_IF_MACRO(entry == NULL, ERR_NO_SUCH_FILE, NULL);
retval = (FileHandle *) malloc(sizeof (FileHandle));
BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);
finfo = (QPAKfileinfo *) malloc(sizeof (QPAKfileinfo));
if (finfo == NULL)
{
free(retval);
BAIL_MACRO(ERR_OUT_OF_MEMORY, NULL);
} /* if */
finfo->handle = __PHYSFS_platformOpenRead(info->filename);
if ( (finfo->handle == NULL) ||
(!__PHYSFS_platformSeek(finfo->handle, entry->startPos)) )
{
free(finfo);
free(retval);
return(NULL);
} /* if */
finfo->curPos = 0;
finfo->entry = entry;
retval->opaque = (void *) finfo;
retval->funcs = &__PHYSFS_FileFunctions_QPAK;
retval->dirHandle = h;
return(retval);
} /* QPAK_openRead */
static FileHandle *QPAK_openWrite(DirHandle *h, const char *name)
{
BAIL_MACRO(ERR_NOT_SUPPORTED, NULL);
} /* QPAK_openWrite */
static FileHandle *QPAK_openAppend(DirHandle *h, const char *name)
{
BAIL_MACRO(ERR_NOT_SUPPORTED, NULL);
} /* QPAK_openAppend */
static int QPAK_remove(DirHandle *h, const char *name)
{
BAIL_MACRO(ERR_NOT_SUPPORTED, 0);
} /* QPAK_remove */
static int QPAK_mkdir(DirHandle *h, const char *name)
{
BAIL_MACRO(ERR_NOT_SUPPORTED, 0);
} /* QPAK_mkdir */
#endif /* defined PHYSFS_SUPPORTS_QPAK */
/* end of qpak.c ... */
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