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liblzma: Add internal constant INDEX_RECORDS_MAX

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It's the theoretical maximum number of Records that fit in a .xz file.
This can be used to reject obviously wrong values.
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Lasse Collin 2026-06-03 00:05:48 +03:00
parent 25a53ed6d1
commit 9ff4dadca9
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src/liblzma/common/index.h
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@ -26,6 +26,12 @@
/// Maximum Unpadded Size
#define UNPADDED_SIZE_MAX (LZMA_VLI_MAX & ~LZMA_VLI_C(3))
/// Maximum number of Records if all sizes fit in one byte:
/// Index Indicator (1) + Number of Records (5) + List of Records + CRC32 (4)
/// Larger value isn't possible because then the Index would grow larger than
/// what Backward Size in Stream Footer can encode (2^34 bytes).
#define INDEX_RECORDS_MAX ((LZMA_BACKWARD_SIZE_MAX - 1 - 5 - 4) / 2)
/// Index Indicator based on xz specification
#define INDEX_INDICATOR 0