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Bangle.js - fix corruption in images with a certain sequence of chars

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This commit is contained in:
Gordon Williams 2022-06-15 10:20:53 +01:00
parent ae3fc3ed48
commit 4c27f43fea
1 changed files with 19 additions and 4 deletions
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23
app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/banglejs/BangleJSDeviceSupport.java
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@ -283,19 +283,34 @@ public class BangleJSDeviceSupport extends AbstractBTLEDeviceSupport {
/* Convert a string, escaping chars we can't send over out UART connection */
String s = (String)v;
String json = "\"";
//String rawString = "";
for (int i=0;i<s.length();i++) {
int ch = (int)s.charAt(i);
if (ch<8) json += "\\"+ch;
else if (ch==8) json += "\\b";
int ch = (int)s.charAt(i); // 0..255
int nextCh = (int)(i+1<s.length() ? s.charAt(i+1) : 0); // 0..255
//rawString = rawString+ch+",";
if (ch<8) {
// if the next character is a digit, it'd be interpreted
// as a 2 digit octal character, so we can't use `\0` to escape it
if (nextCh>='0' && nextCh<='7') json += "\\x0" + ch;
else json += "\\" + ch;
} else if (ch==8) json += "\\b";
else if (ch==9) json += "\\t";
else if (ch==10) json += "\\n";
else if (ch==11) json += "\\v";
else if (ch==12) json += "\\f";
else if (ch==34) json += "\\\""; // quote
else if (ch==92) json += "\\\\"; // slash
else if (ch<32 || ch==26 || ch==27 || ch==127 || ch==173) json += "\\x"+Integer.toHexString((ch&255)|256).substring(1);
else if (ch<32 || ch==127 || ch==173)
json += "\\x"+Integer.toHexString((ch&255)|256).substring(1);
else json += s.charAt(i);
}
// if it was less characters to send base64, do that!
if (json.length() > 5+(s.length()*4/3)) {
byte[] bytes = s.getBytes(StandardCharsets.ISO_8859_1);
return "atob(\""+Base64.encodeToString(bytes, Base64.DEFAULT).replaceAll("\n","")+"\")";
}
// for debugging...
//addReceiveHistory("\n---------------------\n"+rawString+"\n---------------------\n");
return json + "\"";
} else if (v instanceof JSONArray) {
JSONArray a = (JSONArray)v;