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Issue #25318: Add _PyBytesWriter API

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Add a new private API to optimize Unicode encoders. It uses a small buffer
allocated on the stack and supports overallocation.

Use _PyBytesWriter API for UCS1 (ASCII and Latin1) and UTF-8 encoders. Enable
overallocation for the UTF-8 encoder with error handlers.

unicode_encode_ucs1(): initialize collend to collstart+1 to not check the
current character twice, we already know that it is not ASCII.
This commit is contained in:
Victor Stinner 2015-10-09 00:33:49 +02:00
parent 08ec6d9611
commit fdfbf78114
3 changed files with 269 additions and 133 deletions
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2
Include/unicodeobject.h
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@ -908,7 +908,7 @@ typedef struct {
/* minimum character (default: 127, ASCII) */
Py_UCS4 min_char;
/* If non-zero, overallocate the buffer by 25% (default: 0). */
/* If non-zero, overallocate the buffer (default: 0). */
unsigned char overallocate;
/* If readonly is 1, buffer is a shared string (cannot be modified)