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py: Add typecode to buffer protocol.

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When querying an object that supports the buffer protocol, that object
must now return a typecode (as per binary.[ch]).  This does not have to
be honoured by the caller, but can be useful for determining element
size.
This commit is contained in:
Damien George
2014-04-18 22:29:21 +01:00
parent 3fd2d7fad2
commit 57a4b4f178
7 changed files with 24 additions and 25 deletions
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24
py/obj.h
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@@ -189,32 +189,28 @@ typedef struct _mp_method_t {
} mp_method_t;
// Buffer protocol
typedef struct _buffer_info_t {
typedef struct _mp_buffer_info_t {
// if we'd bother to support various versions of structure
// (with different number of fields), we can distinguish
// them with ver = sizeof(struct). Cons: overkill for *micro*?
//int ver; // ?
void *buf;
machine_int_t len;
// Rationale: have array.array and have SIMD operations on them
// Cons: users can pass item size to processing functions themselves,
// though that's not "plug&play"
// int itemsize;
machine_int_t len; // in bytes
int typecode; // as per binary.h
// Rationale: to load arbitrary-sized sprites directly to LCD
// Cons: a bit adhoc usecase
// int stride;
} buffer_info_t;
#define BUFFER_READ (1)
#define BUFFER_WRITE (2)
#define BUFFER_RW (BUFFER_READ | BUFFER_WRITE)
} mp_buffer_info_t;
#define MP_BUFFER_READ (1)
#define MP_BUFFER_WRITE (2)
#define MP_BUFFER_RW (MP_BUFFER_READ | MP_BUFFER_WRITE)
typedef struct _mp_buffer_p_t {
machine_int_t (*get_buffer)(mp_obj_t obj, buffer_info_t *bufinfo, int flags);
machine_int_t (*get_buffer)(mp_obj_t obj, mp_buffer_info_t *bufinfo, int flags);
} mp_buffer_p_t;
bool mp_get_buffer(mp_obj_t obj, buffer_info_t *bufinfo);
void mp_get_buffer_raise(mp_obj_t obj, buffer_info_t *bufinfo);
bool mp_get_buffer(mp_obj_t obj, mp_buffer_info_t *bufinfo);
void mp_get_buffer_raise(mp_obj_t obj, mp_buffer_info_t *bufinfo);
// Stream protocol
typedef struct _mp_stream_p_t {