filelog: don't crash on invalid copy metadata (issue5748) "copy" and "copyrev" are both supposed to appear next to each other. However, a user report demonstrated a crash that indicates that something in the wild is producing "copy" without "copyrev" (probably `hg convert`). While we should definitely fix the source of the bad metadata, the bad code causing the crash is already in the wild and who knows how many repositories are impacted. So let's be more defensive when accessing the file revision metadata.

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#ifndef _HG_BDIFF_H_

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#define _HG_BDIFF_H_

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#include "compat.h"

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struct bdiff_line {

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	int hash, n, e;

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	ssize_t len;

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	const char *l;

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};

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struct bdiff_hunk;

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struct bdiff_hunk {

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	int a1, a2, b1, b2;

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	struct bdiff_hunk *next;

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};

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int bdiff_splitlines(const char *a, ssize_t len, struct bdiff_line **lr);

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int bdiff_diff(struct bdiff_line *a, int an, struct bdiff_line *b, int bn,

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               struct bdiff_hunk *base);

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void bdiff_freehunks(struct bdiff_hunk *l);

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#endif