this repo has no description
move mapfs chain pointer to decompressedLength field
Previously, END DATA's offset field served dual purpose: 0 for end-of-chain,
or address for next table. Now offset always contains the TOC size (used for
buffer allocation), and chain links are in decompressedLength field.
This eliminates special-case handling for empty archives - both empty and
non-empty archives use the first entry's offset for TOC size.
+7
-4
+7
-4
src/main/java/assets/archive/AssetsArchiveBuilder.kt
+7
-4
src/main/java/assets/archive/AssetsArchiveBuilder.kt
···
9
9
* Binary format:
10
10
* - Header (32 bytes): Magic "MAPFS " + project name (16 bytes) + reserved (10 bytes)
11
11
* - Table of Contents: 76-byte entries (name + offset + compressedSize + decompressedSize)
12
-
* - Sentinel Entry: "END DATA\0" + next-node offset (0 = end of chain)
12
+
* - Sentinel Entry: "END DATA\0" + TOC size + 0 + next-node offset (0 = end of chain)
13
13
* - Asset Data: Compressed (Yay0) or raw binary data
14
+
*
15
+
* Note: The sentinel's offset field contains the TOC size, allowing proper buffer allocation
16
+
* even for empty archives. The chain pointer is in the decompressedLength field.
14
17
*/
15
18
class AssetsArchiveBuilder(private val projectName: String) {
16
19
private val entries = mutableListOf<AssetsArchiveEntry>()
···
115
118
buffer.put(sentinelBytes)
116
119
buffer.put(ByteArray(64 - sentinelBytes.size)) // Null padding
117
120
118
-
// Next-node offset (4 bytes): 0 = end of chain
119
-
buffer.putInt(0)
121
+
// Offset (4 bytes): TOC size (used for allocating buffer)
122
+
buffer.putInt(tocSize)
120
123
121
124
// Compressed size (4 bytes): 0
122
125
buffer.putInt(0)
123
126
124
-
// Decompressed size (4 bytes): 0
127
+
// Decompressed size (4 bytes): next-node offset (0 = end of chain)
125
128
buffer.putInt(0)
126
129
}
127
130