OpenTTD
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Base class for simple binary blobs. More...
#include <blob.hpp>
Data Structures | |
struct | BlobHeader |
header of the allocated memory block More... |
Public Member Functions | |
ByteBlob () | |
default constructor - initializes empty blob | |
ByteBlob (const ByteBlob &src) | |
copy constructor | |
ByteBlob (BlobHeader *const &src) | |
move constructor - take ownership of blob data | |
~ByteBlob () | |
destructor | |
bool | IsEmpty () const |
return true if blob doesn't contain valid data | |
size_t | Length () const |
return the number of valid data bytes in the blob | |
size_t | Capacity () const |
return the current blob capacity in bytes | |
byte * | Begin () |
return pointer to the first byte of data - non-const version | |
const byte * | Begin () const |
return pointer to the first byte of data - const version | |
void | Clear () |
invalidate blob's data - doesn't free buffer | |
void | Free () |
free the blob's memory | |
void | AppendRaw (const void *p, size_t num_bytes) |
append new bytes at the end of existing data bytes - reallocates if necessary | |
void | AppendRaw (const ByteBlob &src) |
append bytes from given source blob to the end of existing data bytes - reallocates if necessary | |
byte * | Prepare (size_t num_bytes) |
Reallocate if there is no free space for num_bytes bytes. | |
byte * | Append (size_t num_bytes) |
Increase Length() by num_bytes. | |
void | SmartAlloc (size_t new_size) |
reallocate blob data if needed | |
void | FixTail () const |
fixing the four bytes at the end of blob data - useful when blob is used to hold string |
Static Public Attributes | |
static const size_t | tail_reserve = 4 |
four extra bytes will be always allocated and zeroed at the end | |
static const size_t | header_size = sizeof(BlobHeader) |
Protected Member Functions | |
void | InitEmpty () |
initialize the empty blob | |
void | Init (BlobHeader *src) |
initialize blob by attaching it to the given header followed by data | |
BlobHeader & | Hdr () |
blob header accessor - use it rather than using the pointer arithmetics directly - non-const version | |
const BlobHeader & | Hdr () const |
blob header accessor - use it rather than using the pointer arithmetics directly - const version | |
size_t & | LengthRef () |
return reference to the actual blob size - used when the size needs to be modified |
Static Protected Member Functions | |
static BlobHeader * | RawAlloc (size_t num_bytes) |
all allocation should happen here | |
static BlobHeader * | Zero () |
Return header pointer to the static BlobHeader with both items and capacity containing zero. | |
static size_t | AllocPolicy (size_t min_alloc) |
simple allocation policy - can be optimized later | |
static void | RawFree (BlobHeader *p) |
all deallocations should happen here |
Protected Attributes | |
union { | |
byte * data | |
ptr to the first byte of data | |
BlobHeader * header | |
ptr just after the BlobHeader holding items and capacity | |
}; | |
type used as class member |
Static Private Attributes | |
static BlobHeader | hdrEmpty [] = {{0, 0}, {0, 0}} |
Just to silence an unsilencable GCC 4.4+ warning Note: This cannot be 'const' as we do a lot of 'hdrEmpty[0]->items += 0;' and 'hdrEmpty[0]->capacity += 0;' after const_casting. |
Base class for simple binary blobs.
Item is byte. The word 'simple' means:
Internal member layout:
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inline |
Increase Length() by num_bytes.
Definition at line 253 of file blob.hpp.
References LengthRef(), and Prepare().
Referenced by AppendRaw(), and CBlobT< char >::GrowSizeNC().
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inline |
Reallocate if there is no free space for num_bytes bytes.
Definition at line 242 of file blob.hpp.
References Capacity(), data, Length(), and SmartAlloc().
Referenced by Append(), and CBlobT< char >::MakeFreeSpace().
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staticprivate |