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initial changes to support size prefixed buffers in Java

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This commit is contained in:
Robert Schmidtke
2017-10-02 09:29:46 +02:00
parent 7a6b2bf521
commit 9b8bb2e8a3
2 changed files with 94 additions and 21 deletions
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65
java/com/google/flatbuffers/FlatBufferBuilder.java
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@@ -816,14 +816,55 @@ public class FlatBufferBuilder {
* Finalize a buffer, pointing to the given `root_table`.
*
* @param root_table An offset to be added to the buffer.
* @param size_prefix Whether to prefix the size to the buffer.
*/
public void finish(int root_table) {
prep(minalign, SIZEOF_INT);
protected void finish(int root_table, boolean size_prefix) {
prep(minalign, SIZEOF_INT + (size_prefix ? SIZEOF_INT : 0));
addOffset(root_table);
if (size_prefix) {
addInt(bb.capacity() - space);
}
bb.position(space);
finished = true;
}
/**
* Finalize a buffer, pointing to the given `root_table`.
*
* @param root_table An offset to be added to the buffer.
*/
public void finish(int root_table) {
finish(root_table, false);
}
/**
* Finalize a buffer, pointing to the given `root_table`.+, with the size prefixed.
*
* @param root_table An offset to be added to the buffer.
*/
public void finishSizePrefixed(int root_table) {
finish(root_table, true);
}
/**
* Finalize a buffer, pointing to the given `root_table`.
*
* @param root_table An offset to be added to the buffer.
* @param file_identifier A FlatBuffer file identifier to be added to the buffer before
* `root_table`.
* @param size_prefix Whether to prefix the size to the buffer.
*/
protected void finish(int root_table, String file_identifier, boolean size_prefix) {
prep(minalign, SIZEOF_INT + FILE_IDENTIFIER_LENGTH + (size_prefix ? SIZEOF_INT : 0));
if (file_identifier.length() != FILE_IDENTIFIER_LENGTH)
throw new AssertionError("FlatBuffers: file identifier must be length " +
FILE_IDENTIFIER_LENGTH);
for (int i = FILE_IDENTIFIER_LENGTH - 1; i >= 0; i--) {
addByte((byte)file_identifier.charAt(i));
}
finish(root_table, size_prefix);
}
/**
* Finalize a buffer, pointing to the given `root_table`.
*
@@ -832,14 +873,18 @@ public class FlatBufferBuilder {
* `root_table`.
*/
public void finish(int root_table, String file_identifier) {
prep(minalign, SIZEOF_INT + FILE_IDENTIFIER_LENGTH);
if (file_identifier.length() != FILE_IDENTIFIER_LENGTH)
throw new AssertionError("FlatBuffers: file identifier must be length " +
FILE_IDENTIFIER_LENGTH);
for (int i = FILE_IDENTIFIER_LENGTH - 1; i >= 0; i--) {
addByte((byte)file_identifier.charAt(i));
}
finish(root_table);
finish(root_table, file_identifier, false);
}
/**
* Finalize a buffer, pointing to the given `root_table`, with the size prefixed.
*
* @param root_table An offset to be added to the buffer.
* @param file_identifier A FlatBuffer file identifier to be added to the buffer before
* `root_table`.
*/
public void finishSizePrefixed(int root_table, String file_identifier) {
finish(root_table, file_identifier, true);
}
/**