From 188365cc3ae4cf5e3b0b2001a3558555727e50da Mon Sep 17 00:00:00 2001
From: Joey Zheng <joey@jzheng.org>
Date: Fri, 31 Aug 2012 15:30:15 +0800
Subject: add Chinese Language support.

---
 junklib.c | 33 +++++++++++++++++++++++++++++++--
 1 file changed, 31 insertions(+), 2 deletions(-)

(limited to 'junklib.c')

diff --git a/junklib.c b/junklib.c
index d31a9435..0d142337 100644
--- a/junklib.c
+++ b/junklib.c
@@ -669,6 +669,24 @@ can_be_russian (const signed char *str) {
     return 0;
 }
 
+static int
+can_be_chinese (const signed char *str) {
+    for (; *str; str++) {
+        if (((unsigned char) *str >= 0x81 && (unsigned char) *str <= 0xFE )
+           && ((unsigned char) *(str+1) >= 0x30 && (unsigned char) *(str+1) <= 0x39)
+           && ((unsigned char) *(str+2) >= 0x81 && (unsigned char) *(str+2) <= 0xFE)
+           && ((unsigned char) *(str+3) >= 0x30 && (unsigned char) *(str+3) <= 0x39)) {
+           return 1;
+        } 
+        if (((unsigned char) *str >= 0x81 && (unsigned char) *str <= 0xFE )
+           && (((unsigned char) *(str+1) >= 0x40 && (unsigned char) *(str+1) <= 0x7E)
+           || ((unsigned char) *(str+1) >= 0x80 && (unsigned char) *(str+1) <= 0xFE))) {
+           return 1;
+        } 
+    }
+    return 0;
+}
+
 static char *
 convstr_id3v2 (int version, uint8_t encoding, const unsigned char* str, int sz) {
     char out[2048] = "";
@@ -682,8 +700,11 @@ convstr_id3v2 (int version, uint8_t encoding, const unsigned char* str, int sz)
         enc = UTF8_STR;
     }
     else if (encoding == 0) {
+        if (can_be_chinese (str)) {
+        // hack to add cp936 support
+            enc = "cp936";
+	} else if (can_be_russian (str)) {
         // hack to add limited cp1251 recoding support
-        if (can_be_russian (str)) {
             enc = "cp1251";
         }
         else {
@@ -766,7 +787,11 @@ convstr_id3v1 (const char* str, int sz) {
         return str;
     }
     const char *enc = "iso8859-1";
-    if (can_be_russian (str)) {
+    if (can_be_chinese (str)) {
+        // hack to add cp936 support
+        enc = "cp936";
+    } else if (can_be_russian (str)) {
+        // hack to add limited cp1251 recoding support
         enc = "cp1251";
     }
 
@@ -3410,6 +3435,10 @@ junk_detect_charset (const char *s) {
     if (u8_valid (s, strlen (s), NULL)) {
         return NULL; // means no recoding required
     }
+    // hack to add cp936 support
+    if (can_be_chinese (s)) {
+       return "cp936";
+    }
     // check if that could be non-latin1 (too many nonascii chars)
     if (can_be_russian (s)) {
         return "cp1251";
-- 
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