webview-bundle

Webview Bundle Format (.wvb)

Header

• Magic Number (8 bytes)
  • Big endian format. Value : 0xf09f8c90 / 0xf09f8e81
  • Represents "🌐🎁" as utf8 encoding.
• Version (1 bytes)
  • Version field for this webview bundle format.
  • Available versions:
    • version1: 0x01
• Index Size (4 bytes)
  • 4 bytes unsigned big endian value (u32)
  • Indicates the size of the Index field to be read next.
• Header checksum (4 bytes)
  • Checksum verifies that the full header data has been decoded correctly.
  • The checksum is the result of xxHash-32 algorithm digesting the header data as input.

Index

• Index
  • This field has dynamic bytes size which is determined by the value of the Index Size field, and value is a big endian format.
  • Format of index should be HashMap formatted with binary encoded:
    • Key is a path for this file.
    • Value contains offset, length for reading contents from the data field.
    • Value can contain http headers which will be included in the response.
• Index checksum (4 bytes)
  • Checksum verifies that the full index data has been decoded correctly.
  • The checksum is the result of xxHash-32 algorithm digesting the encoded index data as input.

Data

• Data
  • This field has dynamic bytes size which can be determined each file offset and length from Index.
  • The content of data is compressed with lz4 block format.
  • The last 4 bytes are the checksum which is the result of xxHash-32 algorithm digesting the compressed data as input.