lzw__block_advance()

static lzw_result fl::third_party::lzw__block_advance ( struct lzw_read_ctx * ctx )

static

Advance the context to the next sub-block in the input data.

Parameters

[in]

ctx

LZW reading context, updated on success.

Returns

LZW_OK or LZW_OK_EOD on success, appropriate error otherwise.

Definition at line 127 of file lzw.cpp.hpp.

{
    fl::size block_size;
    fl::size next_block_pos = ctx->data_sb_next;
    const fl::u8 *data_next = ctx->data + next_block_pos;
 
    if (next_block_pos >= ctx->data_len) {
        return LZW_NO_DATA;
    }
 
    block_size = *data_next;
 
    if ((next_block_pos + block_size) >= ctx->data_len) {
        return LZW_NO_DATA;
    }
 
    ctx->sb_bit = 0;
    ctx->sb_bit_count = block_size * 8;
 
    if (block_size == 0) {
        ctx->data_sb_next += 1;
        return LZW_OK_EOD;
    }
 
    ctx->sb_data = data_next + 1;
    ctx->data_sb_next += block_size + 1;
 
    return LZW_OK;
}

References FL_NOEXCEPT, LZW_NO_DATA, LZW_OK, and LZW_OK_EOD.

Referenced by lzw__read_code().

Here is the caller graph for this function: