nsgif__parse_header()

static nsgif_error fl::third_party::nsgif__parse_header ( struct nsgif * gif, const fl::u8 ** pos, bool strict )

static

Read GIF header.

6-byte GIF file header is:

+0 3CHARS Signature ('GIF') +3 3CHARS Version ('87a' or '89a')

Parameters

[in]	gif	The GIF object we're decoding.
[in,out]	pos	The current buffer position, updated on success.
[in]	strict	Whether to require a known GIF version.

Returns

NSGIF_OK on success, appropriate error otherwise.

Definition at line 1544 of file gif.cpp.hpp.

{
    const fl::u8 *data = *pos;
    fl::size len = gif->buf + gif->buf_len - data;
 
    if (len < 6) {
        return NSGIF_ERR_END_OF_DATA;
    }
 
    if (strncmp((const char *) data, "GIF", 3) != 0) {
        return NSGIF_ERR_DATA;
    }
    data += 3;
 
    if (strict == true) {
        if ((strncmp((const char *) data, "87a", 3) != 0) &&
            (strncmp((const char *) data, "89a", 3) != 0)) {
            return NSGIF_ERR_DATA;
        }
    }
    data += 3;
 
    *pos = data;
    return NSGIF_OK;
}

References FL_NOEXCEPT, NSGIF_ERR_DATA, NSGIF_ERR_END_OF_DATA, NSGIF_OK, pos, and fl::strncmp().

Referenced by nsgif_data_scan().

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