diff options
Diffstat (limited to 'src/include/mb/pg_wchar.h')
| -rw-r--r-- | src/include/mb/pg_wchar.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/include/mb/pg_wchar.h b/src/include/mb/pg_wchar.h index d57ef017cb4..9227d634f66 100644 --- a/src/include/mb/pg_wchar.h +++ b/src/include/mb/pg_wchar.h @@ -305,6 +305,17 @@ typedef enum pg_enc #define PG_VALID_FE_ENCODING(_enc) PG_VALID_ENCODING(_enc) /* + * When converting strings between different encodings, we assume that space + * for converted result is 4-to-1 growth in the worst case. The rate for + * currently supported encoding pairs are within 3 (SJIS JIS X0201 half width + * kanna -> UTF8 is the worst case). So "4" should be enough for the moment. + * + * Note that this is not the same as the maximum character width in any + * particular encoding. + */ +#define MAX_CONVERSION_GROWTH 4 + +/* * Table for mapping an encoding number to official encoding name and * possibly other subsidiary data. Be careful to check encoding number * before accessing a table entry! |