38 lines
1.3 KiB
Diff
38 lines
1.3 KiB
Diff
--- a/net/minecraft/nbt/NBTSizeTracker.java
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+++ b/net/minecraft/nbt/NBTSizeTracker.java
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@@ -18,4 +18,34 @@
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throw new RuntimeException("Tried to read NBT tag that was too big; tried to allocate: " + this.field_152453_c + "bytes where max allowed: " + this.field_152452_b);
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}
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}
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+
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+ /*
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+ * UTF8 is not a simple encoding system, each character can be either
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+ * 1, 2, or 3 bytes. Depending on where it's numerical value falls.
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+ * We have to count up each character individually to see the true
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+ * length of the data.
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+ *
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+ * Basic concept is that it uses the MSB of each byte as a 'read more' signal.
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+ * So it has to shift each 7-bit segment.
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+ *
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+ * This will accurately count the correct byte length to encode this string, plus the 2 bytes for it's length prefix.
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+ */
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+ public String readUTF(String data) {
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+ func_152450_a(16); //Header length
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+ if (data == null)
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+ return data;
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+
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+ int len = data.length();
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+ int utflen = 0;
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+
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+ for (int i = 0; i < len; i++) {
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+ int c = data.charAt(i);
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+ if ((c >= 0x0001) && (c <= 0x007F)) utflen += 1;
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+ else if (c > 0x07FF) utflen += 3;
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+ else utflen += 2;
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+ }
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+ func_152450_a(8 * utflen);
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+
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+ return data;
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+ }
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}
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