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authorWaqas Hussain <waqas20@gmail.com>2013-04-23 15:55:49 -0400
committerWaqas Hussain <waqas20@gmail.com>2013-04-23 15:55:49 -0400
commit0cba3cd26003a0b17465353ebb7a159d02ad7056 (patch)
tree5c8b0adb745010c2b6860fca22f7e91ed8851830 /util/json.lua
parent8cf79c1fbe0cafeb495e7a404b75a043bc4cfc9e (diff)
downloadprosody-0cba3cd26003a0b17465353ebb7a159d02ad7056.tar.gz
prosody-0cba3cd26003a0b17465353ebb7a159d02ad7056.zip
util.json: New, improved, fixed codepoint to UTF-8 conversion.
Diffstat (limited to 'util/json.lua')
-rw-r--r--util/json.lua37
1 files changed, 11 insertions, 26 deletions
diff --git a/util/json.lua b/util/json.lua
index e8de4d2d..9c2dd2c6 100644
--- a/util/json.lua
+++ b/util/json.lua
@@ -2,8 +2,6 @@
-- Copyright (C) 2008-2010 Matthew Wild
-- Copyright (C) 2008-2010 Waqas Hussain
--
--- utf8char copyright (C) 2007 Rici Lake
---
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
@@ -41,32 +39,19 @@ for i=0,31 do
if not escapes[ch] then escapes[ch] = ("\\u%.4X"):format(i); end
end
-local function utf8char(i)
- if i >= 0 then
- i = i - i%1
- if i < 128 then
- return s_char(i)
- else
- local c1 = i % 64
- i = (i - c1) / 64
- if i < 32 then
- return s_char(0xC0+i, 0x80+c1)
- else
- local c2 = i % 64
- i = (i - c2) / 64
- if i < 16 and (i ~= 13 or c2 < 32) then
- return s_char(0xE0+i, 0x80+c2, 0x80+c1)
- elseif i >= 16 and i < 0x110 then
- local c3 = i % 64
- i = (i - c3) / 64
- return s_char(0xF0+i, 0x80+c3, 0x80+c2, 0x80+c1)
- end
- end
- end
+local function codepoint_to_utf8(code)
+ if code < 0x80 then return s_char(code); end
+ local bits0_6 = code % 64;
+ if code < 0x800 then
+ local bits6_5 = (code - bits0_6) / 64;
+ return s_char(0x80 + 0x40 + bits6_5, 0x80 + bits0_6);
end
+ local bits0_12 = code % 4096;
+ local bits6_6 = (bits0_12 - bits0_6) / 64;
+ local bits12_4 = (code - bits0_12) / 4096;
+ return s_char(0x80 + 0x40 + 0x20 + bits12_4, 0x80 + bits6_6, 0x80 + bits0_6);
end
-
local valid_types = {
number = true,
string = true,
@@ -292,7 +277,7 @@ function json.decode(json)
if not ch:match("[0-9a-fA-F]") then error("invalid unicode escape sequence in string"); end
seq = seq..ch;
end
- s = s..utf8char(tonumber(seq, 16));
+ s = s..codepoint_to_utf8(tonumber(seq, 16));
next();
else error("invalid escape sequence in string"); end
end