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Only check the file's length once in pdb.Msf.init

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Jonathan S 2021-12-21 13:11:14 -06:00 • committed by Andrew Kelley
parent 2cbeb85a96
commit 24cca2a55e
1 changed files with 3 additions and 2 deletions
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5
lib/std/pdb.zig
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@ -868,7 +868,8 @@ const Msf = struct {
return error.InvalidDebugInfo; return error.InvalidDebugInfo;
if (superblock.FreeBlockMapBlock != 1 and superblock.FreeBlockMapBlock != 2) if (superblock.FreeBlockMapBlock != 1 and superblock.FreeBlockMapBlock != 2)
return error.InvalidDebugInfo; return error.InvalidDebugInfo;
if (superblock.NumBlocks * superblock.BlockSize != try file.getEndPos()) const file_len = try file.getEndPos();
if (superblock.NumBlocks * superblock.BlockSize != file_len)
return error.InvalidDebugInfo; return error.InvalidDebugInfo;
switch (superblock.BlockSize) { switch (superblock.BlockSize) {
// llvm only supports 4096 but we can handle any of these values // llvm only supports 4096 but we can handle any of these values
@ -919,7 +920,7 @@ const Msf = struct {
const block_id = try directory.reader().readIntLittle(u32); const block_id = try directory.reader().readIntLittle(u32);
const n = (block_id % superblock.BlockSize); const n = (block_id % superblock.BlockSize);
// 0 is for SuperBlock, 1 and 2 for FPMs. // 0 is for SuperBlock, 1 and 2 for FPMs.
if (block_id == 0 or n == 1 or n == 2 or block_id * superblock.BlockSize > try file.getEndPos()) if (block_id == 0 or n == 1 or n == 2 or block_id * superblock.BlockSize > file_len)
return error.InvalidBlockIndex; return error.InvalidBlockIndex;
blocks[j] = block_id; blocks[j] = block_id;
} }