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Don't convert pointers for already uploaded LFS files
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,126 @@ | ||
| package git.lfs.migrate; | ||
|
|
||
| import org.jetbrains.annotations.NotNull; | ||
| import org.jetbrains.annotations.Nullable; | ||
|
|
||
| import java.nio.ByteBuffer; | ||
| import java.nio.charset.CharacterCodingException; | ||
| import java.nio.charset.CharsetDecoder; | ||
| import java.nio.charset.StandardCharsets; | ||
| import java.util.Map; | ||
| import java.util.TreeMap; | ||
|
|
||
| /** | ||
| * Class for read/writer pointer blobs. | ||
| * https://github.com/github/git-lfs/blob/master/docs/spec.md | ||
| * | ||
| * @author Artem V. Navrotskiy <bozaro@users.noreply.github.com> | ||
| */ | ||
| public class LfsPointer { | ||
| public static final int POINTER_MAX_SIZE = 1024; | ||
| @NotNull | ||
| public static final String OID = "oid"; | ||
| @NotNull | ||
| public static final String SIZE = "size"; | ||
|
|
||
| @NotNull | ||
| private static final String[] REQUIRED = { | ||
| OID, | ||
| SIZE, | ||
| }; | ||
| @NotNull | ||
| private static final byte[] PREFIX = "version ".getBytes(StandardCharsets.UTF_8); | ||
|
|
||
| /** | ||
| * Read pointer data. | ||
| * | ||
| * @param blob Blob data. | ||
| * @return Return pointer info or null if blob is not a pointer data. | ||
| */ | ||
| @Nullable | ||
| public static Map<String, String> parsePointer(@NotNull byte[] blob) { | ||
| return parsePointer(blob, 0, blob.length); | ||
| } | ||
|
|
||
| /** | ||
| * Read pointer data. | ||
| * | ||
| * @param blob Blob data. | ||
| * @return Return pointer info or null if blob is not a pointer data. | ||
| */ | ||
| @Nullable | ||
| public static Map<String, String> parsePointer(@NotNull byte[] blob, final int offset, final int length) { | ||
| // Check prefix | ||
| if (length < PREFIX.length) return null; | ||
| for (int i = 0; i < PREFIX.length; ++i) { | ||
| if (blob[i] != PREFIX[i]) return null; | ||
| } | ||
| // Reading key value pairs | ||
| final TreeMap<String, String> result = new TreeMap<>(); | ||
| final CharsetDecoder decoder = StandardCharsets.UTF_8.newDecoder(); | ||
| String lastKey = null; | ||
| int keyOffset = offset; | ||
| int required = 0; | ||
| while (true) { | ||
| if (keyOffset >= length) { | ||
| break; | ||
| } | ||
| int valueOffset = keyOffset; | ||
| // Key | ||
| while (true) { | ||
| valueOffset++; | ||
| if (valueOffset < length) { | ||
| final byte c = blob[valueOffset]; | ||
| if (c == ' ') break; | ||
| // Keys MUST only use the characters [a-z] [0-9] . -. | ||
| if (c >= 'a' && c <= 'z') continue; | ||
| if (c >= '0' && c <= '9') continue; | ||
| if (c == '.' || c == '-') continue; | ||
| } | ||
| // Found invalid character. | ||
| return null; | ||
| } | ||
| int endOffset = valueOffset; | ||
| // Value | ||
| while (true) { | ||
| endOffset++; | ||
| if (endOffset >= length) return null; | ||
| // Values MUST NOT contain return or newline characters. | ||
| if (blob[endOffset] == '\n') break; | ||
| } | ||
| final String key = new String(blob, keyOffset, valueOffset - keyOffset, StandardCharsets.UTF_8); | ||
|
|
||
| final String value; | ||
| try { | ||
| value = decoder.decode(ByteBuffer.wrap(blob, valueOffset + 1, endOffset - valueOffset - 1)).toString(); | ||
| } catch (CharacterCodingException e) { | ||
| return null; | ||
| } | ||
| if (required < REQUIRED.length && REQUIRED[required].equals(key)) { | ||
| required++; | ||
| } | ||
| if (keyOffset > offset) { | ||
| if (lastKey != null && key.compareTo(lastKey) <= 0) { | ||
| return null; | ||
| } | ||
| lastKey = key; | ||
| } | ||
| if (result.put(key, value) != null) { | ||
| return null; | ||
| } | ||
| keyOffset = endOffset + 1; | ||
| } | ||
| // Not found all required fields. | ||
| if (required < REQUIRED.length) { | ||
| return null; | ||
| } | ||
| try { | ||
| if (Long.parseLong(result.get(SIZE)) < 0) { | ||
| return null; | ||
| } | ||
| } catch (NumberFormatException ignored) { | ||
| return null; | ||
| } | ||
| return result; | ||
| } | ||
| } |