diff options
Diffstat (limited to 'src/H5Fint.c')
| -rw-r--r-- | src/H5Fint.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/src/H5Fint.c b/src/H5Fint.c index 31f4176..3600476 100644 --- a/src/H5Fint.c +++ b/src/H5Fint.c @@ -1644,6 +1644,9 @@ done: * then increments the pointer to the first byte after the * address. An undefined value is stored as all 1's. * + * Note this function is almost identical to H5F_size_encode. + * Changes should be made in both places. + * * Return: void * * Programmer: Robb Matzke @@ -1716,6 +1719,9 @@ H5F_addr_encode(const H5F_t *f, uint8_t **pp/*in,out*/, haddr_t addr) * If the value read is all 1's then the address is returned * with an undefined value. * + * Note this function is almost identical to H5F_size_decode. + * Changes should be made in both places. + * * Return: void * * Programmer: Robb Matzke @@ -1806,6 +1812,127 @@ H5F_addr_decode(const H5F_t *f, const uint8_t **pp/*in,out*/, haddr_t *addr_p/*o /*------------------------------------------------------------------------- + * Function: H5F_size_encode + * + * Purpose: Encodes a size into the buffer pointed to by *PP and then + * increments the pointer to the first byte after the size. + * An undefined value is stored as all 1's. If size cannot + * be HSIZE_UNDEF, then you can use H5F_ENCODE_LENGTH + * instead. + * + * Note this function is almost identical to H5F_addr_encode + * and H5F_addr_encode_len. Changes should be made in both + * places. + * + * Return: void + * + * Programmer: Neil Fortner + * Friday, April 10, 2015 + * + *------------------------------------------------------------------------- + */ +void +H5F_size_encode(const H5F_t *f, uint8_t **pp/*in,out*/, hsize_t size) +{ + unsigned u; /* Local index variable */ + + /* Use FUNC_ENTER_NOAPI_NOINIT_NOERR here to avoid performance issues */ + FUNC_ENTER_NOAPI_NOINIT_NOERR + + HDassert(f); + HDassert(pp && *pp); + + if(size != HSIZE_UNDEF) { + for(u = 0; u < H5F_SIZEOF_SIZE(f); u++) { + *(*pp)++ = (uint8_t)(size & 0xff); + size >>= 8; + } /* end for */ + HDassert("overflow" && 0 == size); + } /* end if */ + else { + for(u = 0; u < H5F_SIZEOF_SIZE(f); u++) + *(*pp)++ = 0xff; + } /* end else */ + + FUNC_LEAVE_NOAPI_VOID +} /* end H5F_size_encode() */ + + +/*------------------------------------------------------------------------- + * Function: H5F_size_decode + * + * Purpose: Decodes a size from the buffer pointed to by *PP and + * updates the pointer to point to the next byte after the + * size. + * + * If the value read is all 1's then the size is returned + * with an undefined value. If size cannot be HSIZE_UNDEF, + * then you can use H5F_DECODE_LENGTH instead. + * + * Note this function is almost identical to H5F_addr_decode + * and H5F_addr_decode_len. Changes should be made in both + * places. + * + * Return: void + * + * Programmer: Neil Fortner + * Friday, April 10, 2015 + * + *------------------------------------------------------------------------- + */ +void +H5F_size_decode(const H5F_t *f, const uint8_t **pp/*in,out*/, + hsize_t *size_p/*out*/) +{ + hbool_t all_zero = TRUE; /* True if address was all zeroes */ + unsigned u; /* Local index variable */ + + /* Use FUNC_ENTER_NOAPI_NOINIT_NOERR here to avoid performance issues */ + FUNC_ENTER_NOAPI_NOINIT_NOERR + + HDassert(f); + HDassert(pp && *pp); + HDassert(size_p); + + /* Reset value in destination */ + *size_p = 0; + + /* Decode bytes from size */ + for(u = 0; u < H5F_SIZEOF_SIZE(f); u++) { + uint8_t c; /* Local decoded byte */ + + /* Get decoded byte (and advance pointer) */ + c = *(*pp)++; + + /* Check for non-undefined size byte value */ + if(c != 0xff) + all_zero = FALSE; + + if(u < sizeof(*size_p)) { + haddr_t tmp = c; /* Local copy of size, for casting */ + + /* Shift decoded byte to correct position */ + tmp <<= (u * 8); /*use tmp to get casting right */ + + /* Merge into already decoded bytes */ + *size_p |= tmp; + } /* end if */ + else + if(!all_zero) + HDassert(0 == **pp); /*overflow */ + } /* end for */ + + /* If 'all_zero' is still TRUE, the size_p was entirely composed of '0xff' + * bytes, which is the encoded form of 'HSIZE_UNDEF', so set the destination + * to that value */ + if(all_zero) + *size_p = HSIZE_UNDEF; + + FUNC_LEAVE_NOAPI_VOID +} /* end H5F_size_decode() */ + + +/*------------------------------------------------------------------------- * Function: H5F_set_grp_btree_shared * * Purpose: Set the grp_btree_shared field with a valid ref-count pointer. |