2001-07-09 02:49:41 +02:00
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/*
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* GRP support routines for PhysicsFS.
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*
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* This driver handles BUILD engine archives ("groupfiles"). This format
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* (but not this driver) was put together by Ken Silverman.
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*
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* The format is simple enough. In Ken's words:
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*
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* What's the .GRP file format?
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*
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* The ".grp" file format is just a collection of a lot of files stored
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* into 1 big one. I tried to make the format as simple as possible: The
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* first 12 bytes contains my name, "KenSilverman". The next 4 bytes is
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* the number of files that were compacted into the group file. Then for
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* each file, there is a 16 byte structure, where the first 12 bytes are
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* the filename, and the last 4 bytes are the file's size. The rest of
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* the group file is just the raw data packed one after the other in the
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* same order as the list of files.
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*
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* (That info is from http://www.advsys.net/ken/build.htm ...)
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*
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* As it was never a concern in the DOS-based Duke Nukem days, I treat these
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* archives as CASE-INSENSITIVE. Opening "myfile.txt" and "MYFILE.TXT" both
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* work, and get the same file.
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*
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* Please see the file LICENSE 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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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <assert.h>
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#include "physfs.h"
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#define __PHYSICSFS_INTERNAL__
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#include "physfs_internal.h"
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#if (!defined PHYSFS_SUPPORTS_GRP)
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#error PHYSFS_SUPPORTS_GRP must be defined.
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#endif
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typedef struct
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{
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FILE *handle;
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int totalEntries;
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} GRPinfo;
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typedef struct
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{
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int startPos;
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int curPos;
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int size;
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} GRPfileinfo;
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extern const DirFunctions __PHYSFS_DirFunctions_GRP;
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static const FileFunctions __PHYSFS_FileFunctions_GRP;
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static int GRP_read(FileHandle *handle, void *buffer,
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unsigned int objSize, unsigned int objCount)
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{
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GRPfileinfo *finfo = (GRPfileinfo *) (handle->opaque);
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FILE *fh = (FILE *) (((GRPinfo *) (handle->dirHandle->opaque))->handle);
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int bytesLeft = (finfo->startPos + finfo->size) - finfo->curPos;
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int objsLeft = bytesLeft / objSize;
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int retval = 0;
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if (objsLeft < objCount)
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objCount = objsLeft;
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errno = 0;
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BAIL_IF_MACRO(fseek(fh,finfo->curPos,SEEK_SET) == -1,strerror(errno),-1);
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errno = 0;
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retval = fread(buffer, objSize, objCount, fh);
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2001-07-09 03:43:28 +02:00
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finfo->curPos += (retval * objSize);
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2001-07-09 02:49:41 +02:00
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BAIL_IF_MACRO((retval < objCount) && (ferror(fh)),strerror(errno),retval);
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return(retval);
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} /* GRP_read */
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static int GRP_eof(FileHandle *handle)
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{
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GRPfileinfo *finfo = (GRPfileinfo *) (handle->opaque);
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return(finfo->curPos >= finfo->startPos + finfo->size);
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} /* GRP_eof */
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static int GRP_tell(FileHandle *handle)
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{
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GRPfileinfo *finfo = (GRPfileinfo *) (handle->opaque);
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return(finfo->curPos - finfo->startPos);
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} /* GRP_tell */
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static int GRP_seek(FileHandle *handle, int offset)
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{
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GRPfileinfo *finfo = (GRPfileinfo *) (handle->opaque);
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2001-07-09 03:43:28 +02:00
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int newPos = finfo->startPos + offset;
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2001-07-09 02:49:41 +02:00
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BAIL_IF_MACRO(offset < 0, ERR_INVALID_ARGUMENT, 0);
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BAIL_IF_MACRO(newPos > finfo->startPos + finfo->size, ERR_PAST_EOF, 0);
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finfo->curPos = newPos;
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return(1);
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} /* GRP_seek */
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2001-07-09 06:15:35 +02:00
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static int GRP_fileLength(FileHandle *handle)
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{
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GRPfileinfo *finfo = (GRPfileinfo *) (handle->opaque);
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return(finfo->size);
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} /* GRP_fileLength */
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2001-07-09 02:49:41 +02:00
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static int GRP_fileClose(FileHandle *handle)
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{
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free(handle->opaque);
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free(handle);
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return(1);
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} /* GRP_fileClose */
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static int openGrp(const char *filename, int forWriting, FILE **fh, int *count)
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{
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char buf[12];
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assert(sizeof (int) == 4);
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*fh = NULL;
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BAIL_IF_MACRO(forWriting, ERR_ARC_IS_READ_ONLY, 0);
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errno = 0;
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*fh = fopen(filename, "rb");
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BAIL_IF_MACRO(*fh == NULL, strerror(errno), 0);
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errno = 0;
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BAIL_IF_MACRO(fread(buf, 12, 1, *fh) != 1, strerror(errno), 0);
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BAIL_IF_MACRO(strncmp(buf, "KenSilverman", 12) != 0,
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ERR_UNSUPPORTED_ARCHIVE, 0);
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if (fread(count, 4, 1, *fh) != 1)
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*count = 0;
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return(1);
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} /* openGrp */
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static int GRP_isArchive(const char *filename, int forWriting)
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{
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FILE *fh;
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int fileCount;
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int retval = openGrp(filename, forWriting, &fh, &fileCount);
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if (fh != NULL)
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fclose(fh);
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return(retval);
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} /* GRP_isArchive */
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static DirHandle *GRP_openArchive(const char *name, int forWriting)
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{
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FILE *fh;
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int fileCount;
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DirHandle *retval = malloc(sizeof (DirHandle));
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BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);
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retval->opaque = malloc(sizeof (GRPinfo));
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if (retval->opaque == NULL)
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{
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free(retval);
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BAIL_IF_MACRO(1, ERR_OUT_OF_MEMORY, NULL);
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} /* if */
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if (!openGrp(name, forWriting, &fh, &fileCount))
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{
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if (fh != NULL)
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fclose(fh);
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free(retval->opaque);
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free(retval);
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} /* if */
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((GRPinfo *) retval->opaque)->handle = fh;
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((GRPinfo *) retval->opaque)->totalEntries = fileCount;
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retval->funcs = &__PHYSFS_DirFunctions_GRP;
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return(retval);
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} /* GRP_openArchive */
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static LinkedStringList *GRP_enumerateFiles(DirHandle *h, const char *dirname)
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{
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char buf[16];
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GRPinfo *g = (GRPinfo *) (h->opaque);
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FILE *fh = g->handle;
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int i;
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LinkedStringList *retval = NULL;
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LinkedStringList *l = NULL;
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LinkedStringList *prev = NULL;
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2001-07-15 11:28:37 +02:00
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if (*dirname != '\0') /* no directories in GRP files. */
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return(NULL);
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2001-07-09 02:49:41 +02:00
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/* jump to first file entry... */
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errno = 0;
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BAIL_IF_MACRO(fseek(fh, 16, SEEK_SET) == -1, strerror(errno), NULL);
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for (i = 0; i < g->totalEntries; i++)
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{
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errno = 0;
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BAIL_IF_MACRO(fread(buf, 16, 1, fh) != 1, strerror(errno), retval);
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buf[12] = '\0'; /* FILENAME.EXT is all you get. */
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l = (LinkedStringList *) malloc(sizeof (LinkedStringList));
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2001-07-16 16:36:02 +02:00
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if (l == NULL)
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2001-07-09 02:49:41 +02:00
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break;
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l->str = (char *) malloc(strlen(buf) + 1);
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if (l->str == NULL)
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{
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free(l);
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break;
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} /* if */
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2001-07-16 16:36:02 +02:00
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strcpy(l->str, buf);
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2001-07-09 02:49:41 +02:00
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if (retval == NULL)
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retval = l;
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else
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prev->next = l;
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prev = l;
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l->next = NULL;
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} /* for */
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return(retval);
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} /* GRP_enumerateFiles */
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static int getFileEntry(DirHandle *h, const char *name, int *size)
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{
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char buf[16];
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GRPinfo *g = (GRPinfo *) (h->opaque);
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FILE *fh = g->handle;
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int i;
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char *ptr;
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2001-07-09 03:43:28 +02:00
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int retval = (g->totalEntries + 1) * 16; /* offset of raw file data */
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2001-07-09 02:49:41 +02:00
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/* Rule out filenames to avoid unneeded file i/o... */
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if (strchr(name, '/') != NULL) /* no directories in groupfiles. */
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return(-1);
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ptr = strchr(name, '.');
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if ((ptr) && (strlen(ptr) > 4)) /* 3 char extension at most. */
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return(-1);
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if (strlen(name) > 12)
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return(-1);
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/* jump to first file entry... */
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errno = 0;
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BAIL_IF_MACRO(fseek(fh, 16, SEEK_SET) == -1, strerror(errno), -1);
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for (i = 0; i < g->totalEntries; i++)
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{
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int fsize;
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errno = 0;
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BAIL_IF_MACRO(fread(buf, 16, 1, fh) != 1, strerror(errno), -1);
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fsize = *((int *) (buf + 12));
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buf[12] = '\0'; /* FILENAME.EXT is all you get. */
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if (__PHYSFS_platformStricmp(buf, name) == 0)
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{
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if (size != NULL)
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*size = fsize;
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return(retval);
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} /* if */
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retval += fsize;
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} /* for */
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return(-1); /* not found. */
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} /* getFileEntry */
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static int GRP_exists(DirHandle *h, const char *name)
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{
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return(getFileEntry(h, name, NULL) != -1);
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} /* GRP_exists */
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static int GRP_isDirectory(DirHandle *h, const char *name)
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{
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return(0); /* never directories in a groupfile. */
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} /* GRP_isDirectory */
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static int GRP_isSymLink(DirHandle *h, const char *name)
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{
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return(0); /* never symlinks in a groupfile. */
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} /* GRP_isSymLink */
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static FileHandle *GRP_openRead(DirHandle *h, const char *name)
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{
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FileHandle *retval;
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GRPfileinfo *finfo;
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int size, offset;
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offset = getFileEntry(h, name, &size);
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BAIL_IF_MACRO(offset == -1, ERR_NO_SUCH_FILE, NULL);
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retval = (FileHandle *) malloc(sizeof (FileHandle));
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BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);
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finfo = (GRPfileinfo *) malloc(sizeof (GRPfileinfo));
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if (finfo == NULL)
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{
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free(retval);
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BAIL_IF_MACRO(1, ERR_OUT_OF_MEMORY, NULL);
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} /* if */
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finfo->startPos = offset;
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finfo->curPos = offset;
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finfo->size = size;
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retval->opaque = (void *) finfo;
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retval->funcs = &__PHYSFS_FileFunctions_GRP;
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retval->dirHandle = h;
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return(retval);
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} /* GRP_openRead */
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static void GRP_dirClose(DirHandle *h)
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{
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fclose( ((GRPinfo *) h->opaque)->handle );
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free(h->opaque);
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free(h);
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} /* GRP_dirClose */
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static const FileFunctions __PHYSFS_FileFunctions_GRP =
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{
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2001-07-09 06:15:35 +02:00
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GRP_read, /* read() method */
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NULL, /* write() method */
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GRP_eof, /* eof() method */
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GRP_tell, /* tell() method */
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GRP_seek, /* seek() method */
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GRP_fileLength, /* fileLength() method */
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GRP_fileClose /* fileClose() method */
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2001-07-09 02:49:41 +02:00
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};
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const DirFunctions __PHYSFS_DirFunctions_GRP =
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{
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GRP_isArchive, /* isArchive() method */
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GRP_openArchive, /* openArchive() method */
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GRP_enumerateFiles, /* enumerateFiles() method */
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GRP_exists, /* exists() method */
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GRP_isDirectory, /* isDirectory() method */
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GRP_isSymLink, /* isSymLink() method */
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GRP_openRead, /* openRead() method */
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NULL, /* openWrite() method */
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NULL, /* openAppend() method */
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NULL, /* remove() method */
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NULL, /* mkdir() method */
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|
|
|
GRP_dirClose /* dirClose() method */
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|
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|
};
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const PHYSFS_ArchiveInfo __PHYSFS_ArchiveInfo_GRP =
|
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|
{
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|
|
"GRP",
|
2001-07-10 01:33:37 +02:00
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|
|
"Build engine Groupfile format",
|
2001-07-16 12:31:28 +02:00
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|
|
"Ryan C. Gordon (icculus@linuxgames.com)",
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|
|
|
"http://www.icculus.org/~icculus/",
|
2001-07-09 02:49:41 +02:00
|
|
|
};
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|
/* end of grp.c ... */
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