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Commit7d3aece

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tglsfdcpull[bot]
authored andcommitted
Fix small overestimation of base64 encoding output length.
pg_base64_enc_len() and its clones overestimated the outputlength by up to 2 bytes, as a result of sloppy thinking aboutwhere to divide. No callers require a precise estimate, sothis has no consequences worse than palloc'ing a byte or twomore than necessary. We might as well get it right though.This bug is very ancient, dating to commit79d78bb whichadded encode.c. (The other instances were presumably copiedfrom there.) Still, it doesn't quite seem worth back-patching.Oleg TselebrovskiyDiscussion:https://postgr.es/m/f94da55286a63022150bc266afdab754@postgrespro.ru
1 parent3eb92a3 commit7d3aece

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3 files changed

+3
-3
lines changed

3 files changed

+3
-3
lines changed

‎contrib/pgcrypto/pgp-armor.c

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -165,7 +165,7 @@ pg_base64_enc_len(unsigned srclen)
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/*
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* 3 bytes will be converted to 4, linefeed after 76 chars
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*/
168-
return (srclen+2)*4/3+srclen / (76*3 /4);
168+
return (srclen+2) /3*4+srclen / (76*3 /4);
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}
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staticunsigned

‎src/backend/utils/adt/encode.c

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -385,7 +385,7 @@ static uint64
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pg_base64_enc_len(constchar*src,size_tsrclen)
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{
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/* 3 bytes will be converted to 4, linefeed after 76 chars */
388-
return ((uint64)srclen+2)*4/3+ (uint64)srclen / (76*3 /4);
388+
return ((uint64)srclen+2) /3*4+ (uint64)srclen / (76*3 /4);
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}
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staticuint64

‎src/common/base64.c

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -224,7 +224,7 @@ int
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pg_b64_enc_len(intsrclen)
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{
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/* 3 bytes will be converted to 4 */
227-
return (srclen+2)*4/3;
227+
return (srclen+2) /3*4;
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}
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/*

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