fteqw/engine/common/fs_zip.c

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#include "quakedef.h"
#include "fs.h"
#ifdef AVAIL_ZLIB
#ifndef ZEXPORT
#define ZEXPORT VARGS
#endif
#include <zlib.h>
typedef struct {
unsigned char ident1;
unsigned char ident2;
unsigned char cm;
unsigned char flags;
unsigned int mtime;
unsigned char xflags;
unsigned char os;
} gzheader_t;
#define sizeofgzheader_t 10
#define GZ_FTEXT 1
#define GZ_FHCRC 2
#define GZ_FEXTRA 4
#define GZ_FNAME 8
#define GZ_FCOMMENT 16
#define GZ_RESERVED (32|64|128)
#ifdef DYNAMIC_ZLIB
#define ZLIB_LOADED() (zlib_handle!=NULL)
void *zlib_handle;
#define ZSTATIC(n)
#else
#define ZLIB_LOADED() 1
#define ZSTATIC(n) = &n
#ifdef _MSC_VER
# ifdef _WIN64
# pragma comment(lib, MSVCLIBSPATH "zlib64.lib")
# else
# pragma comment(lib, MSVCLIBSPATH "zlib.lib")
# endif
#endif
#endif
//#pragma comment(lib, MSVCLIBSPATH "zlib.lib")
static int (ZEXPORT *qinflateEnd) OF((z_streamp strm)) ZSTATIC(inflateEnd);
static int (ZEXPORT *qinflate) OF((z_streamp strm, int flush)) ZSTATIC(inflate);
static int (ZEXPORT *qinflateInit2_) OF((z_streamp strm, int windowBits,
const char *version, int stream_size)) ZSTATIC(inflateInit2_);
static uLong (ZEXPORT *qcrc32) OF((uLong crc, const Bytef *buf, uInt len)) ZSTATIC(crc32);
#define qinflateInit2(strm, windowBits) \
qinflateInit2_((strm), (windowBits), ZLIB_VERSION, sizeof(z_stream))
qboolean LibZ_Init(void)
{
#ifdef DYNAMIC_ZLIB
static dllfunction_t funcs[] =
{
{(void*)&qinflateEnd, "inflateEnd"},
{(void*)&qinflate, "inflate"},
{(void*)&qinflateInit2_, "inflateInit2_"},
{(void*)&qcrc32, "crc32"},
{NULL, NULL}
};
if (!ZLIB_LOADED())
zlib_handle = Sys_LoadLibrary("zlib1", funcs);
#endif
return ZLIB_LOADED();
}
vfsfile_t *FS_DecompressGZip(vfsfile_t *infile)
{
char inchar;
unsigned short inshort;
vfsfile_t *temp;
gzheader_t header;
if (VFS_READ(infile, &header, sizeofgzheader_t) == sizeofgzheader_t)
{
if (header.ident1 != 0x1f || header.ident2 != 0x8b || header.cm != 8 || header.flags & GZ_RESERVED)
{
VFS_SEEK(infile, 0);
return infile;
}
}
else
{
VFS_SEEK(infile, 0);
return infile;
}
if (header.flags & GZ_FEXTRA)
{
VFS_READ(infile, &inshort, sizeof(inshort));
inshort = LittleShort(inshort);
VFS_SEEK(infile, VFS_TELL(infile) + inshort);
}
if (header.flags & GZ_FNAME)
{
Con_Printf("gzipped file name: ");
do {
if (VFS_READ(infile, &inchar, sizeof(inchar)) != 1)
break;
Con_Printf("%c", inchar);
} while(inchar);
Con_Printf("\n");
}
if (header.flags & GZ_FCOMMENT)
{
Con_Printf("gzipped file comment: ");
do {
if (VFS_READ(infile, &inchar, sizeof(inchar)) != 1)
break;
Con_Printf("%c", inchar);
} while(inchar);
Con_Printf("\n");
}
if (header.flags & GZ_FHCRC)
{
VFS_READ(infile, &inshort, sizeof(inshort));
}
temp = FS_OpenTemp();
if (!temp)
{
VFS_SEEK(infile, 0); //doh
return infile;
}
{
unsigned char inbuffer[16384];
unsigned char outbuffer[16384];
int ret;
z_stream strm = {
inbuffer,
0,
0,
outbuffer,
sizeof(outbuffer),
0,
NULL,
NULL,
NULL,
NULL,
NULL,
Z_UNKNOWN,
0,
0
};
strm.avail_in = VFS_READ(infile, inbuffer, sizeof(inbuffer));
strm.next_in = inbuffer;
qinflateInit2(&strm, -MAX_WBITS);
while ((ret=qinflate(&strm, Z_SYNC_FLUSH)) != Z_STREAM_END)
{
if (strm.avail_in == 0 || strm.avail_out == 0)
{
if (strm.avail_in == 0)
{
strm.avail_in = VFS_READ(infile, inbuffer, sizeof(inbuffer));
strm.next_in = inbuffer;
if (!strm.avail_in)
break;
}
if (strm.avail_out == 0)
{
strm.next_out = outbuffer;
VFS_WRITE(temp, outbuffer, strm.total_out);
strm.total_out = 0;
strm.avail_out = sizeof(outbuffer);
}
continue;
}
//doh, it terminated for no reason
if (ret != Z_STREAM_END)
{
qinflateEnd(&strm);
Con_Printf("Couldn't decompress gz file\n");
VFS_CLOSE(temp);
VFS_CLOSE(infile);
return NULL;
}
}
//we got to the end
VFS_WRITE(temp, outbuffer, strm.total_out);
qinflateEnd(&strm);
VFS_SEEK(temp, 0);
}
VFS_CLOSE(infile);
return temp;
}
#include "unzip.c"
typedef struct
{
char name[MAX_QPATH];
int filepos, filelen;
bucket_t bucket;
} zpackfile_t;
typedef struct zipfile_s
{
char filename[MAX_OSPATH];
unzFile handle;
int numfiles;
zpackfile_t *files;
#ifdef HASH_FILESYSTEM
hashtable_t hash;
#endif
vfsfile_t *raw;
vfsfile_t *currentfile; //our unzip.c can only handle one active file at any one time
//so we have to keep closing and switching.
//slow, but it works. most of the time we'll only have a single file open anyway.
int references; //and a reference count
} zipfile_t;
static void FSZIP_PrintPath(void *handle)
{
zipfile_t *zip = handle;
if (zip->references != 1)
Con_Printf("%s (%i)\n", zip->filename, zip->references-1);
else
Con_Printf("%s\n", zip->filename);
}
static void FSZIP_ClosePath(void *handle)
{
zipfile_t *zip = handle;
if (--zip->references > 0)
return; //not yet time
unzClose(zip->handle);
if (zip->files)
Z_Free(zip->files);
Z_Free(zip);
}
static void FSZIP_BuildHash(void *handle)
{
zipfile_t *zip = handle;
int i;
for (i = 0; i < zip->numfiles; i++)
{
if (!Hash_GetInsensative(&filesystemhash, zip->files[i].name))
{
fs_hash_files++;
Hash_AddInsensative(&filesystemhash, zip->files[i].name, &zip->files[i], &zip->files[i].bucket);
}
else
fs_hash_dups++;
}
}
static qboolean FSZIP_FLocate(void *handle, flocation_t *loc, const char *filename, void *hashedresult)
{
zpackfile_t *pf = hashedresult;
int i, len;
zipfile_t *zip = handle;
// look through all the pak file elements
if (pf)
{ //is this a pointer to a file in this pak?
if (pf < zip->files || pf >= zip->files + zip->numfiles)
return false; //was found in a different path
}
else
{
for (i=0 ; i<zip->numfiles ; i++) //look for the file
{
if (!stricmp (zip->files[i].name, filename))
{
pf = &zip->files[i];
break;
}
}
}
if (pf)
{
len = pf->filelen;
if (loc)
{
loc->index = pf - zip->files;
strcpy(loc->rawname, zip->filename);
loc->offset = pf->filepos;
loc->len = pf->filelen;
unzLocateFileMy (zip->handle, loc->index, zip->files[loc->index].filepos);
loc->offset = unzGetCurrentFileUncompressedPos(zip->handle);
// if (loc->offset<0)
// { //file not found, or is compressed.
// *loc->rawname = '\0';
// loc->offset=0;
// }
}
return true;
}
return false;
}
static void FSZIP_ReadFile(void *handle, flocation_t *loc, char *buffer)
{
zipfile_t *zip = handle;
int err;
unzLocateFileMy (zip->handle, loc->index, zip->files[loc->index].filepos);
unzOpenCurrentFile (zip->handle);
err = unzReadCurrentFile (zip->handle, buffer, zip->files[loc->index].filelen);
unzCloseCurrentFile (zip->handle);
if (err!=zip->files[loc->index].filelen)
{
Con_Printf ("Can't extract file \"%s:%s\" (corrupt)\n", zip->filename, zip->files[loc->index].name);
return;
}
return;
}
static int FSZIP_EnumerateFiles (void *handle, const char *match, int (*func)(const char *, int, void *), void *parm)
{
zipfile_t *zip = handle;
int num;
for (num = 0; num<(int)zip->numfiles; num++)
{
if (wildcmp(match, zip->files[num].name))
{
if (!func(zip->files[num].name, zip->files[num].filelen, parm))
return false;
}
}
return true;
}
/*
=================
COM_LoadZipFile
Takes an explicit (not game tree related) path to a pak file.
Loads the header and directory, adding the files at the beginning
of the list so they override previous pack files.
=================
*/
static void *FSZIP_LoadZipFile (vfsfile_t *packhandle, const char *desc)
{
int i;
int nextfileziphandle;
zipfile_t *zip;
zpackfile_t *newfiles;
unz_global_info globalinf = {0};
unz_file_info file_info;
zip = Z_Malloc(sizeof(zipfile_t));
Q_strncpyz(zip->filename, desc, sizeof(zip->filename));
zip->handle = unzOpen ((zip->raw = packhandle));
if (!zip->handle)
{
Z_Free(zip);
Con_TPrintf (TL_COULDNTOPENZIP, desc);
return NULL;
}
unzGetGlobalInfo (zip->handle, &globalinf);
zip->numfiles = globalinf.number_entry;
zip->files = newfiles = Z_Malloc (zip->numfiles * sizeof(zpackfile_t));
for (i = 0; i < zip->numfiles; i++)
{
if (unzGetCurrentFileInfo (zip->handle, &file_info, newfiles[i].name, sizeof(newfiles[i].name), NULL, 0, NULL, 0) != UNZ_OK)
Con_Printf("Zip Error\n");
Q_strlwr(newfiles[i].name);
if (!*newfiles[i].name || newfiles[i].name[strlen(newfiles[i].name)-1] == '/')
newfiles[i].filelen = -1;
else
newfiles[i].filelen = file_info.uncompressed_size;
newfiles[i].filepos = file_info.c_offset;
nextfileziphandle = unzGoToNextFile (zip->handle);
if (nextfileziphandle == UNZ_END_OF_LIST_OF_FILE)
break;
else if (nextfileziphandle != UNZ_OK)
Con_Printf("Zip Error\n");
}
zip->references = 1;
zip->currentfile = NULL;
Con_TPrintf (TL_ADDEDZIPFILE, desc, zip->numfiles);
return zip;
}
int FSZIP_GeneratePureCRC(void *handle, int seed, int crctype)
{
zipfile_t *zip = handle;
unz_file_info file_info;
int result;
int *filecrcs;
int numcrcs=0;
int i;
filecrcs = BZ_Malloc((zip->numfiles+1)*sizeof(int));
filecrcs[numcrcs++] = seed;
unzGoToFirstFile(zip->handle);
for (i = 0; i < zip->numfiles; i++)
{
if (zip->files[i].filelen>0)
{
unzGetCurrentFileInfo (zip->handle, &file_info, NULL, 0, NULL, 0, NULL, 0);
filecrcs[numcrcs++] = file_info.crc;
}
unzGoToNextFile (zip->handle);
}
if (crctype)
result = Com_BlockChecksum(filecrcs, numcrcs*sizeof(int));
else
result = Com_BlockChecksum(filecrcs+1, (numcrcs-1)*sizeof(int));
BZ_Free(filecrcs);
return result;
}
typedef struct {
vfsfile_t funcs;
vfsfile_t *defer;
//in case we're forced away.
zipfile_t *parent;
qboolean iscompressed;
int pos;
int length; //try and optimise some things
int index;
int startpos;
} vfszip_t;
void VFSZIP_MakeActive(vfszip_t *vfsz)
{
int i;
char buffer[8192]; //must be power of two
if ((vfszip_t*)vfsz->parent->currentfile == vfsz)
return; //already us
if (vfsz->parent->currentfile)
unzCloseCurrentFile(vfsz->parent->handle);
unzLocateFileMy(vfsz->parent->handle, vfsz->index, vfsz->startpos);
unzOpenCurrentFile(vfsz->parent->handle);
if (vfsz->pos > 0)
{
Con_DPrintf("VFSZIP_MakeActive: Shockingly inefficient\n");
//now we need to seek up to where we had previously gotten to.
for (i = 0; i < vfsz->pos-sizeof(buffer); i++)
unzReadCurrentFile(vfsz->parent->handle, buffer, sizeof(buffer));
unzReadCurrentFile(vfsz->parent->handle, buffer, vfsz->pos - i);
}
vfsz->parent->currentfile = (vfsfile_t*)vfsz;
}
int VFSZIP_ReadBytes (struct vfsfile_s *file, void *buffer, int bytestoread)
{
int read;
vfszip_t *vfsz = (vfszip_t*)file;
if (vfsz->defer)
return VFS_READ(vfsz->defer, buffer, bytestoread);
if (vfsz->iscompressed)
{
VFSZIP_MakeActive(vfsz);
read = unzReadCurrentFile(vfsz->parent->handle, buffer, bytestoread);
}
else
{
if (vfsz->parent->currentfile != file)
{
unzCloseCurrentFile(vfsz->parent->handle);
VFS_SEEK(vfsz->parent->raw, vfsz->pos+vfsz->startpos);
vfsz->parent->currentfile = file;
}
read = VFS_READ(vfsz->parent->raw, buffer, bytestoread);
}
vfsz->pos += read;
return read;
}
int VFSZIP_WriteBytes (struct vfsfile_s *file, void *buffer, int bytestoread)
{
Sys_Error("VFSZIP_WriteBytes: Not supported\n");
return 0;
}
qboolean VFSZIP_Seek (struct vfsfile_s *file, unsigned long pos)
{
vfszip_t *vfsz = (vfszip_t*)file;
if (vfsz->defer)
return VFS_SEEK(vfsz->defer, pos);
//This is *really* inefficient
if (vfsz->parent->currentfile == file)
{
if (vfsz->iscompressed)
{ //if they're going to seek on a file in a zip, let's just copy it out
char buffer[8192];
unsigned int chunk;
unsigned int i;
unsigned int length;
vfsz->defer = FS_OpenTemp();
if (vfsz->defer)
{
unzCloseCurrentFile(vfsz->parent->handle);
vfsz->parent->currentfile = NULL; //make it not us
length = vfsz->length;
i = 0;
vfsz->pos = 0;
VFSZIP_MakeActive(vfsz);
while (1)
{
chunk = length - i;
if (chunk > sizeof(buffer))
chunk = sizeof(buffer);
if (chunk == 0)
break;
unzReadCurrentFile(vfsz->parent->handle, buffer, chunk);
VFS_WRITE(vfsz->defer, buffer, chunk);
i += chunk;
}
}
}
unzCloseCurrentFile(vfsz->parent->handle);
vfsz->parent->currentfile = NULL; //make it not us
if (vfsz->defer)
return VFS_SEEK(vfsz->defer, pos);
}
if (pos < 0 || pos > vfsz->length)
return false;
vfsz->pos = pos;
return true;
}
unsigned long VFSZIP_Tell (struct vfsfile_s *file)
{
vfszip_t *vfsz = (vfszip_t*)file;
if (vfsz->defer)
return VFS_TELL(vfsz->defer);
return vfsz->pos;
}
unsigned long VFSZIP_GetLen (struct vfsfile_s *file)
{
vfszip_t *vfsz = (vfszip_t*)file;
return vfsz->length;
}
void VFSZIP_Close (struct vfsfile_s *file)
{
vfszip_t *vfsz = (vfszip_t*)file;
if (vfsz->parent->currentfile == file)
vfsz->parent->currentfile = NULL; //make it not us
if (vfsz->defer)
VFS_CLOSE(vfsz->defer);
FSZIP_ClosePath(vfsz->parent);
Z_Free(vfsz);
}
vfsfile_t *FSZIP_OpenVFS(void *handle, flocation_t *loc, const char *mode)
{
int rawofs;
zipfile_t *zip = handle;
vfszip_t *vfsz;
if (strcmp(mode, "rb"))
return NULL; //urm, unable to write/append
if (loc->len < 0)
return NULL;
vfsz = Z_Malloc(sizeof(vfszip_t));
vfsz->parent = zip;
vfsz->index = loc->index;
vfsz->startpos = zip->files[loc->index].filepos;
vfsz->length = loc->len;
vfsz->funcs.Close = VFSZIP_Close;
vfsz->funcs.GetLen = VFSZIP_GetLen;
vfsz->funcs.ReadBytes = VFSZIP_ReadBytes;
vfsz->funcs.Seek = VFSZIP_Seek;
vfsz->funcs.Tell = VFSZIP_Tell;
vfsz->funcs.WriteBytes = NULL;
vfsz->funcs.seekingisabadplan = true;
unzLocateFileMy(vfsz->parent->handle, vfsz->index, vfsz->startpos);
rawofs = unzGetCurrentFileUncompressedPos(zip->handle);
vfsz->iscompressed = rawofs<0;
if (!vfsz->iscompressed)
{
vfsz->startpos = rawofs;
VFS_SEEK(zip->raw, vfsz->startpos);
vfsz->parent->currentfile = (vfsfile_t*)vfsz;
}
else if (!ZLIB_LOADED())
{
Z_Free(vfsz);
return NULL;
}
zip->references++;
return (vfsfile_t*)vfsz;
}
searchpathfuncs_t zipfilefuncs = {
FSZIP_PrintPath,
FSZIP_ClosePath,
FSZIP_BuildHash,
FSZIP_FLocate,
FSZIP_ReadFile,
FSZIP_EnumerateFiles,
FSZIP_LoadZipFile,
FSZIP_GeneratePureCRC,
FSZIP_OpenVFS
};
#endif