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PackedByteArray¶
A packed array of bytes.
描述¶
An array specifically designed to hold bytes. Packs data tightly, so it saves memory for large array sizes.
PackedByteArray also provides methods to encode/decode various types to/from bytes. The way values are encoded is an implementation detail and shouldn't be relied upon when interacting with external apps.
备注
There are notable differences when using this API with C#. See C# API 与 GDScript 的差异 for more information.
构造函数¶
PackedByteArray ( ) |
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PackedByteArray ( PackedByteArray from ) |
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PackedByteArray ( Array from ) |
Methods¶
void |
append_array ( PackedByteArray array ) |
void |
clear ( ) |
decode_double ( int byte_offset ) const |
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decode_float ( int byte_offset ) const |
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decode_half ( int byte_offset ) const |
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decode_s16 ( int byte_offset ) const |
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decode_s32 ( int byte_offset ) const |
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decode_s64 ( int byte_offset ) const |
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decode_u16 ( int byte_offset ) const |
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decode_u32 ( int byte_offset ) const |
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decode_u64 ( int byte_offset ) const |
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decode_var ( int byte_offset, bool allow_objects=false ) const |
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decode_var_size ( int byte_offset, bool allow_objects=false ) const |
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decompress ( int buffer_size, int compression_mode=0 ) const |
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decompress_dynamic ( int max_output_size, int compression_mode=0 ) const |
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duplicate ( ) |
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void |
encode_double ( int byte_offset, float value ) |
void |
encode_float ( int byte_offset, float value ) |
void |
encode_half ( int byte_offset, float value ) |
void |
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void |
encode_s16 ( int byte_offset, int value ) |
void |
encode_s32 ( int byte_offset, int value ) |
void |
encode_s64 ( int byte_offset, int value ) |
void |
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void |
encode_u16 ( int byte_offset, int value ) |
void |
encode_u32 ( int byte_offset, int value ) |
void |
encode_u64 ( int byte_offset, int value ) |
encode_var ( int byte_offset, Variant value, bool allow_objects=false ) |
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void |
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get_string_from_ascii ( ) const |
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get_string_from_utf8 ( ) const |
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get_string_from_utf16 ( ) const |
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get_string_from_utf32 ( ) const |
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get_string_from_wchar ( ) const |
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has_encoded_var ( int byte_offset, bool allow_objects=false ) const |
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hex_encode ( ) const |
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is_empty ( ) const |
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void |
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void |
reverse ( ) |
void |
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size ( ) const |
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void |
sort ( ) |
to_float32_array ( ) const |
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to_float64_array ( ) const |
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to_int32_array ( ) const |
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to_int64_array ( ) const |
运算符¶
operator != ( PackedByteArray right ) |
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operator + ( PackedByteArray right ) |
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operator == ( PackedByteArray right ) |
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operator [] ( int index ) |
Constructor Descriptions¶
PackedByteArray PackedByteArray ( )
Constructs an empty PackedByteArray.
PackedByteArray PackedByteArray ( PackedByteArray from )
Constructs a PackedByteArray as a copy of the given PackedByteArray.
PackedByteArray PackedByteArray ( Array from )
Constructs a new PackedByteArray. Optionally, you can pass in a generic Array that will be converted.
Method Descriptions¶
Appends an element at the end of the array (alias of push_back).
void append_array ( PackedByteArray array )
Appends a PackedByteArray at the end of this array.
int bsearch ( int value, bool before=true )
Finds the index of an existing value (or the insertion index that maintains sorting order, if the value is not yet present in the array) using binary search. Optionally, a before specifier can be passed. If false, the returned index comes after all existing entries of the value in the array.
Note: Calling bsearch on an unsorted array results in unexpected behavior.
void clear ( )
Clears the array. This is equivalent to using resize with a size of 0.
PackedByteArray compress ( int compression_mode=0 ) const
Returns a new PackedByteArray with the data compressed. Set the compression mode using one of CompressionMode's constants.
Returns the number of times an element is in the array.
float decode_double ( int byte_offset ) const
Decodes a 64-bit floating point number from the bytes starting at byte_offset. Fails if the byte count is insufficient. Returns 0.0 if a valid number can't be decoded.
float decode_float ( int byte_offset ) const
Decodes a 32-bit floating point number from the bytes starting at byte_offset. Fails if the byte count is insufficient. Returns 0.0 if a valid number can't be decoded.
float decode_half ( int byte_offset ) const
Decodes a 16-bit floating point number from the bytes starting at byte_offset. Fails if the byte count is insufficient. Returns 0.0 if a valid number can't be decoded.
int decode_s8 ( int byte_offset ) const
Decodes a 8-bit signed integer number from the bytes starting at byte_offset. Fails if the byte count is insufficient. Returns 0 if a valid number can't be decoded.
int decode_s16 ( int byte_offset ) const
Decodes a 16-bit signed integer number from the bytes starting at byte_offset. Fails if the byte count is insufficient. Returns 0 if a valid number can't be decoded.
int decode_s32 ( int byte_offset ) const
Decodes a 32-bit signed integer number from the bytes starting at byte_offset. Fails if the byte count is insufficient. Returns 0 if a valid number can't be decoded.
int decode_s64 ( int byte_offset ) const
Decodes a 64-bit signed integer number from the bytes starting at byte_offset. Fails if the byte count is insufficient. Returns 0 if a valid number can't be decoded.
int decode_u8 ( int byte_offset ) const
Decodes a 8-bit unsigned integer number from the bytes starting at byte_offset. Fails if the byte count is insufficient. Returns 0 if a valid number can't be decoded.
int decode_u16 ( int byte_offset ) const
Decodes a 16-bit unsigned integer number from the bytes starting at byte_offset. Fails if the byte count is insufficient. Returns 0 if a valid number can't be decoded.
int decode_u32 ( int byte_offset ) const
Decodes a 32-bit unsigned integer number from the bytes starting at byte_offset. Fails if the byte count is insufficient. Returns 0 if a valid number can't be decoded.
int decode_u64 ( int byte_offset ) const
Decodes a 64-bit unsigned integer number from the bytes starting at byte_offset. Fails if the byte count is insufficient. Returns 0 if a valid number can't be decoded.
Variant decode_var ( int byte_offset, bool allow_objects=false ) const
Decodes a Variant from the bytes starting at byte_offset. Returns null if a valid variant can't be decoded or the value is Object-derived and allow_objects is false.
int decode_var_size ( int byte_offset, bool allow_objects=false ) const
Decodes a size of a Variant from the bytes starting at byte_offset. Requires at least 4 bytes of data starting at the offset, otherwise fails.
PackedByteArray decompress ( int buffer_size, int compression_mode=0 ) const
Returns a new PackedByteArray with the data decompressed. Set buffer_size to the size of the uncompressed data. Set the compression mode using one of CompressionMode's constants.
PackedByteArray decompress_dynamic ( int max_output_size, int compression_mode=0 ) const
Returns a new PackedByteArray with the data decompressed. Set the compression mode using one of CompressionMode's constants. This method only accepts brotli, gzip, and deflate compression modes.
This method is potentially slower than decompress, as it may have to re-allocate its output buffer multiple times while decompressing, whereas decompress knows it's output buffer size from the beginning.
GZIP has a maximal compression ratio of 1032:1, meaning it's very possible for a small compressed payload to decompress to a potentially very large output. To guard against this, you may provide a maximum size this function is allowed to allocate in bytes via max_output_size. Passing -1 will allow for unbounded output. If any positive value is passed, and the decompression exceeds that amount in bytes, then an error will be returned.
PackedByteArray duplicate ( )
Creates a copy of the array, and returns it.
void encode_double ( int byte_offset, float value )
Encodes a 64-bit floating point number as bytes at the index of byte_offset bytes. The array must have at least 8 bytes of allocated space, starting at the offset.
void encode_float ( int byte_offset, float value )
Encodes a 32-bit floating point number as bytes at the index of byte_offset bytes. The array must have at least 4 bytes of space, starting at the offset.
void encode_half ( int byte_offset, float value )
Encodes a 16-bit floating point number as bytes at the index of byte_offset bytes. The array must have at least 2 bytes of space, starting at the offset.
void encode_s8 ( int byte_offset, int value )
Encodes a 8-bit signed integer number (signed byte) at the index of byte_offset bytes. The array must have at least 1 byte of space, starting at the offset.
void encode_s16 ( int byte_offset, int value )
Encodes a 16-bit signed integer number as bytes at the index of byte_offset bytes. The array must have at least 2 bytes of space, starting at the offset.
void encode_s32 ( int byte_offset, int value )
Encodes a 32-bit signed integer number as bytes at the index of byte_offset bytes. The array must have at least 4 bytes of space, starting at the offset.
void encode_s64 ( int byte_offset, int value )
Encodes a 64-bit signed integer number as bytes at the index of byte_offset bytes. The array must have at least 8 bytes of space, starting at the offset.
void encode_u8 ( int byte_offset, int value )
Encodes a 8-bit unsigned integer number (byte) at the index of byte_offset bytes. The array must have at least 1 byte of space, starting at the offset.
void encode_u16 ( int byte_offset, int value )
Encodes a 16-bit unsigned integer number as bytes at the index of byte_offset bytes. The array must have at least 2 bytes of space, starting at the offset.
void encode_u32 ( int byte_offset, int value )
Encodes a 32-bit unsigned integer number as bytes at the index of byte_offset bytes. The array must have at least 4 bytes of space, starting at the offset.
void encode_u64 ( int byte_offset, int value )
Encodes a 64-bit unsigned integer number as bytes at the index of byte_offset bytes. The array must have at least 8 bytes of space, starting at the offset.
int encode_var ( int byte_offset, Variant value, bool allow_objects=false )
Encodes a Variant at the index of byte_offset bytes. A sufficient space must be allocated, depending on the encoded variant's size. If allow_objects is false, Object-derived values are not permitted and will instead be serialized as ID-only.
void fill ( int value )
Assigns the given value to all elements in the array. This can typically be used together with resize to create an array with a given size and initialized elements.
int find ( int value, int from=0 ) const
Searches the array for a value and returns its index or -1 if not found. Optionally, the initial search index can be passed.
String get_string_from_ascii ( ) const
Converts ASCII/Latin-1 encoded array to String. Fast alternative to get_string_from_utf8 if the content is ASCII/Latin-1 only. Unlike the UTF-8 function this function maps every byte to a character in the array. Multibyte sequences will not be interpreted correctly. For parsing user input always use get_string_from_utf8.
String get_string_from_utf8 ( ) const
Converts UTF-8 encoded array to String. Slower than get_string_from_ascii but supports UTF-8 encoded data. Use this function if you are unsure about the source of the data. For user input this function should always be preferred. Returns empty string if source array is not valid UTF-8 string.
String get_string_from_utf16 ( ) const
Converts UTF-16 encoded array to String. If the BOM is missing, system endianness is assumed. Returns empty string if source array is not valid UTF-16 string.
String get_string_from_utf32 ( ) const
Converts UTF-32 encoded array to String. System endianness is assumed. Returns empty string if source array is not valid UTF-32 string.
String get_string_from_wchar ( ) const
Converts wide character (wchar_t, UTF-16 on Windows, UTF-32 on other platforms) encoded array to String. Returns empty string if source array is not valid wide string.
Returns true if the array contains value.
bool has_encoded_var ( int byte_offset, bool allow_objects=false ) const
Returns true if a valid Variant value can be decoded at the byte_offset. Returns false otherwise or when the value is Object-derived and allow_objects is false.
String hex_encode ( ) const
Returns a hexadecimal representation of this array as a String.
var array = PackedByteArray([11, 46, 255])
print(array.hex_encode()) # Prints: 0b2eff
var array = new byte[] {11, 46, 255};
GD.Print(array.HexEncode()); // Prints: 0b2eff
int insert ( int at_index, int value )
Inserts a new element at a given position in the array. The position must be valid, or at the end of the array (idx == size()).
bool is_empty ( ) const
Returns true if the array is empty.
Appends an element at the end of the array.
void remove_at ( int index )
Removes an element from the array by index.
Sets the size of the array. If the array is grown, reserves elements at the end of the array. If the array is shrunk, truncates the array to the new size.
void reverse ( )
Reverses the order of the elements in the array.
int rfind ( int value, int from=-1 ) const
Searches the array in reverse order. Optionally, a start search index can be passed. If negative, the start index is considered relative to the end of the array.
void set ( int index, int value )
Changes the byte at the given index.
int size ( ) const
Returns the number of elements in the array.
PackedByteArray slice ( int begin, int end=2147483647 ) const
Returns the slice of the PackedByteArray, from begin (inclusive) to end (exclusive), as a new PackedByteArray.
The absolute value of begin and end will be clamped to the array size, so the default value for end makes it slice to the size of the array by default (i.e. arr.slice(1) is a shorthand for arr.slice(1, arr.size())).
If either begin or end are negative, they will be relative to the end of the array (i.e. arr.slice(0, -2) is a shorthand for arr.slice(0, arr.size() - 2)).
void sort ( )
Sorts the elements of the array in ascending order.
PackedFloat32Array to_float32_array ( ) const
Returns a copy of the data converted to a PackedFloat32Array, where each block of 4 bytes has been converted to a 32-bit float (C++ float).
The size of the input array must be a multiple of 4 (size of 32-bit float). The size of the new array will be byte_array.size() / 4.
If the original data can't be converted to 32-bit floats, the resulting data is undefined.
PackedFloat64Array to_float64_array ( ) const
Returns a copy of the data converted to a PackedFloat64Array, where each block of 8 bytes has been converted to a 64-bit float (C++ double, Godot float).
The size of the input array must be a multiple of 8 (size of 64-bit double). The size of the new array will be byte_array.size() / 8.
If the original data can't be converted to 64-bit floats, the resulting data is undefined.
PackedInt32Array to_int32_array ( ) const
Returns a copy of the data converted to a PackedInt32Array, where each block of 4 bytes has been converted to a signed 32-bit integer (C++ int32_t).
The size of the input array must be a multiple of 4 (size of 32-bit integer). The size of the new array will be byte_array.size() / 4.
If the original data can't be converted to signed 32-bit integers, the resulting data is undefined.
PackedInt64Array to_int64_array ( ) const
Returns a copy of the data converted to a PackedInt64Array, where each block of 8 bytes has been converted to a signed 64-bit integer (C++ int64_t, Godot int).
The size of the input array must be a multiple of 8 (size of 64-bit integer). The size of the new array will be byte_array.size() / 8.
If the original data can't be converted to signed 64-bit integers, the resulting data is undefined.
Operator Descriptions¶
bool operator != ( PackedByteArray right )
Returns true if contents of the arrays differ.
PackedByteArray operator + ( PackedByteArray right )
Returns a new PackedByteArray with contents of right added at the end of this array. For better performance, consider using append_array instead.
bool operator == ( PackedByteArray right )
Returns true if contents of both arrays are the same, i.e. they have all equal bytes at the corresponding indices.
Returns the byte at index index. Negative indices can be used to access the elements starting from the end. Using index out of array's bounds will result in an error.
Note that the byte is returned as a 64-bit int.