PRStatus _MD_CreateFileMap(PRFileMap *fmap, PRInt64 size)
{
PRFileInfo64 info;
/* assert on PR_PROT_READWRITE which modifies the underlying file */
PR_ASSERT(fmap->prot == PR_PROT_READONLY ||
fmap->prot == PR_PROT_WRITECOPY);
if (fmap->prot != PR_PROT_READONLY &&
fmap->prot != PR_PROT_WRITECOPY) {
PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
return PR_FAILURE;
}
if (PR_GetOpenFileInfo64(fmap->fd, &info) == PR_FAILURE) {
return PR_FAILURE;
}
/* reject zero-byte mappings & zero-byte files */
if (!size || !info.size) {
PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
return PR_FAILURE;
}
/* file size rounded up to the next page boundary */
fmap->md.maxExtent = (info.size + 0xfff) & ~(0xfff);
return PR_SUCCESS;
}
nsresult
FileLocation::Data::GetSize(uint32_t *result)
{
if (mFd) {
PRFileInfo64 fileInfo;
if (PR_SUCCESS != PR_GetOpenFileInfo64(mFd, &fileInfo))
return NS_ErrorAccordingToNSPR();
if (fileInfo.size > int64_t(PR_UINT32_MAX))
return NS_ERROR_FILE_TOO_BIG;
*result = fileInfo.size;
return NS_OK;
} else if (mItem) {
*result = mItem->RealSize();
return NS_OK;
}
return NS_ERROR_NOT_INITIALIZED;
}
extern PRFileMap * _md_ImportFileMapFromString(
const char *fmstring
)
{
PRStatus rc;
PRInt32 osfd;
PRIntn prot; /* really: a PRFileMapProtect */
PRFileDesc *fd;
PRFileMap *fm = NULL; /* default return value */
PRFileInfo64 info;
PR_sscanf( fmstring, "%ld:%d", &osfd, &prot );
/* import the os file descriptor */
fd = PR_ImportFile( osfd );
if ( NULL == fd ) {
PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
("_md_ImportFileMapFromString(): PR_ImportFile() failed"));
goto Finished;
}
rc = PR_GetOpenFileInfo64( fd, &info );
if ( PR_FAILURE == rc ) {
PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
("_md_ImportFileMapFromString(): PR_GetOpenFileInfo64() failed"));
goto Finished;
}
fm = PR_CreateFileMap( fd, info.size, (PRFileMapProtect)prot );
if ( NULL == fm ) {
PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
("_md_ImportFileMapFromString(): PR_CreateFileMap() failed"));
}
Finished:
return(fm);
} /* end _md_ImportFileMapFromString() */