<?
	# Care must be taken when editing this file as
	# it may be processed by either "xvfs-create"
	# which uses a full Tcl and Rivet parser
	# or by "xvfs-create-c" which uses a much
	# simpler one that only knows about printable
	# sections and ignores all Tcl sections

	if {[info exists ::xvfs::xvfsCoreH]} {
		::minirivet::_emitOutput $::xvfs::xvfsCoreH
	} else {
?>#include <xvfs-core.h><? } ?>
#include <sys/stat.h>
#include <string.h>
#include <tcl.h>

#define XVFS_NAME_LOOKUP_ERROR (-1)
#define XVFS_FILE_BLOCKSIZE 1024

/*
 * XXX:TODO: Determine this automatically rather than
 *           by heuristics
 */
#define HAVE_STRUCT_STAT_ST_BLKSIZE 1
#define HAVE_STRUCT_STAT_ST_BLOCKS  1
#ifdef WIN32
#  undef HAVE_STRUCT_STAT_ST_BLKSIZE
#  undef HAVE_STRUCT_STAT_ST_BLOCKS
#endif

#ifndef MIN
#define MIN(a, b) (((a) < (b)) ? (a) : (b))
#endif

#ifndef HAVE_DEFINED_XVFS_FILE_TYPE_T
#define HAVE_DEFINED_XVFS_FILE_TYPE_T 1
typedef enum {
	XVFS_FILE_TYPE_REG,
	XVFS_FILE_TYPE_DIR
} xvfs_file_type_t;
#endif

#ifndef HAVE_DEFINED_XVFS_SIZE_T
#define HAVE_DEFINED_XVFS_SIZE_T 1
typedef Tcl_WideInt xvfs_size_t;
#endif

#ifndef HAVE_DEFINED_XVFS_FILE_DATA
#define HAVE_DEFINED_XVFS_FILE_DATA 1
struct xvfs_file_data {
	const char * const        name;
	const xvfs_file_type_t    type;
	const xvfs_size_t         size;
	union {
		const unsigned char * const fileContents;
		const char          **dirChildren;
	} data;
};
#endif

<?
	package require xvfs

	set ::xvfs::fileInfoStruct [xvfs::main $::xvfs::argv]
?><?= $::xvfs::fileInfoStruct ?>
static long xvfs_<?= $::xvfs::fsName ?>_nameToIndex(const char *path) {
<?
	set hashTable [::xvfs::generateHashTable pathIndex path pathLen XVFS_NAME_LOOKUP_ERROR $::xvfs::outputFiles prefix "\t" hashTableSize 30 validate "strcmp(path, xvfs_${::xvfs::fsName}_data\[pathIndex\].name) == 0" onValidated "return(pathIndex);"]
	set hashTableHeader [dict get $hashTable header]
?><?= $hashTableHeader ?>
	long pathIndex;
	size_t pathLen;

	if (path == NULL) {
		return(XVFS_NAME_LOOKUP_ERROR);
	}

	pathLen = strlen(path);

<?= [dict get $hashTable body] ?>

	return(XVFS_NAME_LOOKUP_ERROR);
}

static const char **xvfs_<?= $::xvfs::fsName ?>_getChildren(const char *path, long inode, Tcl_WideInt *count) {
	const struct xvfs_file_data *fileInfo;

	/*
	 * Validate input parameters
	 */
	if (count == NULL) {
		return(NULL);
	}
	
	/*
	 * Use user-supplied inode, or look up the path
	 */
	if (inode == XVFS_INODE_NULL) {
		/*
		 * Get the inode from the lookup function
		 */
		inode = xvfs_<?= $::xvfs::fsName ?>_nameToIndex(path);
		if (inode == XVFS_NAME_LOOKUP_ERROR) {
			*count = XVFS_RV_ERR_ENOENT;
			return(NULL);
		}
	}
	
	fileInfo = &xvfs_<?= $::xvfs::fsName ?>_data[inode];

	/*
	 * Ensure this is a directory
	 */
	if (fileInfo->type != XVFS_FILE_TYPE_DIR) {
		*count = XVFS_RV_ERR_ENOTDIR;
		return(NULL);
	}
	
	*count = fileInfo->size;
	return(fileInfo->data.dirChildren);
}

static const unsigned char *xvfs_<?= $::xvfs::fsName ?>_getData(const char *path, long inode, Tcl_WideInt start, Tcl_WideInt *length) {
	const struct xvfs_file_data *fileInfo;
	Tcl_WideInt resultLength;

	/*
	 * Validate input parameters
	 */
	if (length == NULL) {
		return(NULL);
	}
	
	if (start < 0) {
		*length = XVFS_RV_ERR_EINVAL;
		return(NULL);
	}
	
	if (*length < 0) {
		*length = XVFS_RV_ERR_EINVAL;
		return(NULL);
	}


	/*
	 * Use user-supplied inode, or look up the path
	 */
	if (inode == XVFS_INODE_NULL) {
		/*
		 * Get the inode from the lookup function
		 */
		inode = xvfs_<?= $::xvfs::fsName ?>_nameToIndex(path);
		if (inode == XVFS_NAME_LOOKUP_ERROR) {
			*length = XVFS_RV_ERR_ENOENT;
			return(NULL);
		}
	}
	
	fileInfo = &xvfs_<?= $::xvfs::fsName ?>_data[inode];

	/*
	 * Ensure this is a file that can be read
	 */
	if (fileInfo->type != XVFS_FILE_TYPE_REG) {
		*length = XVFS_RV_ERR_EISDIR;
		return(NULL);
	}

	/*
	 * Validate the length
	 */
	if (start > fileInfo->size) {
		*length = XVFS_RV_ERR_EFAULT;
		return(NULL);
	}

	if (*length == 0) {
		resultLength = fileInfo->size - start;
	} else {
		resultLength = MIN(fileInfo->size - start, *length);
	}
	*length = resultLength;

	/*
	 * Return the data
	 */
	return(fileInfo->data.fileContents + start);
}

static int xvfs_<?= $::xvfs::fsName ?>_getStat(const char *path, long inode, Tcl_StatBuf *statBuf) {
	const struct xvfs_file_data *fileInfo;

	/*
	 * Validate input parameters
	 */
	if (!statBuf) {
		return(XVFS_RV_ERR_EINVAL);
	}
	
	/*
	 * Use user-supplied inode, or look up the path
	 */
	if (inode == XVFS_INODE_NULL) {
		/*
		 * Get the inode from the lookup function
		 */
		inode = xvfs_<?= $::xvfs::fsName ?>_nameToIndex(path);
		if (inode == XVFS_NAME_LOOKUP_ERROR) {
			return(XVFS_RV_ERR_ENOENT);
		}
	}
	
	fileInfo = &xvfs_<?= $::xvfs::fsName ?>_data[inode];
	
	statBuf->st_dev   = <?= [zlib adler32 $::xvfs::fsName 0] ?>;
	statBuf->st_rdev  = <?= [zlib adler32 $::xvfs::fsName 0] ?>;
	statBuf->st_ino   = inode;
	statBuf->st_uid   = 0;
	statBuf->st_gid   = 0;
	statBuf->st_atime = 0;
	statBuf->st_ctime = 0;
	statBuf->st_mtime = 0;
#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
	statBuf->st_blksize = XVFS_FILE_BLOCKSIZE;
#endif
	
	if (fileInfo->type == XVFS_FILE_TYPE_REG) {
		statBuf->st_mode   = 0100444;
		statBuf->st_nlink  = 1;
		statBuf->st_size   = fileInfo->size;
#ifdef HAVE_STRUCT_STAT_ST_BLOCKS
		statBuf->st_blocks = (fileInfo->size + statBuf->st_blksize - 1) / statBuf->st_blksize;
#endif
	} else if (fileInfo->type == XVFS_FILE_TYPE_DIR) {
		statBuf->st_mode   = 040555;
		statBuf->st_nlink  = fileInfo->size;
		statBuf->st_size   = fileInfo->size;
#ifdef HAVE_STRUCT_STAT_ST_BLOCKS
		statBuf->st_blocks = 1;
#endif
	}
	
	return(0);
}

static struct Xvfs_FSInfo xvfs_<?= $::xvfs::fsName ?>_fsInfo = {
	.protocolVersion = XVFS_PROTOCOL_VERSION,
	.name            = "<?= $::xvfs::fsName ?>",
	.getChildrenProc = xvfs_<?= $::xvfs::fsName ?>_getChildren,
	.getDataProc     = xvfs_<?= $::xvfs::fsName ?>_getData,
	.getStatProc     = xvfs_<?= $::xvfs::fsName ?>_getStat
};

#ifdef XVFS_<?= $::xvfs::fsName ?>_INIT_STATIC
static
#endif
int Xvfs_<?= $::xvfs::fsName ?>_Init(Tcl_Interp *interp) {
	int register_ret;

#ifdef USE_TCL_STUBS
	const char *tclInitStubs_ret;
	/* Initialize Stubs */
	tclInitStubs_ret = Tcl_InitStubs(interp, TCL_PATCH_LEVEL, 0);
	if (!tclInitStubs_ret) {
		return(TCL_ERROR);
	}
#endif
	
	register_ret = Xvfs_Register(interp, &xvfs_<?= $::xvfs::fsName ?>_fsInfo);
	if (register_ret != TCL_OK) {
		return(register_ret);
	}
	
	return(TCL_OK);
}
#undef XVFS_NAME_LOOKUP_ERROR
#undef XVFS_FILE_BLOCKSIZE
#undef XVFS_<?= $::xvfs::fsName ?>_INIT_STATIC
