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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 250 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 239 of file blob.hpp.
References Capacity(), data, Length(), and SmartAlloc().
Referenced by Append(), and CBlobT< char >::MakeFreeSpace().
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staticprivate |
1.8.1.2