hcie-rust-v3.05/hcie-psd/examples/find_grfl.rs

#![allow(dead_code, unused_imports, unused_variables, unused_macros, unreachable_patterns, unused_assignments, clippy::cfg)]
fn main() {
    let path = "/home/hc/Pictures/Forest Text Effect/Forest-Text-mini.psd";
    let bytes = std::fs::read(path).unwrap();

    let mut pos = 26;
    let color_mode_len = u32::from_be_bytes([bytes[pos], bytes[pos+1], bytes[pos+2], bytes[pos+3]]) as usize;
    pos += 4 + color_mode_len;
    let img_res_len = u32::from_be_bytes([bytes[pos], bytes[pos+1], bytes[pos+2], bytes[pos+3]]) as usize;
    pos += 4 + img_res_len;
    let _layer_mask_len = u32::from_be_bytes([bytes[pos], bytes[pos+1], bytes[pos+2], bytes[pos+3]]) as usize;
    pos += 4;
    let _layer_info_len = u32::from_be_bytes([bytes[pos], bytes[pos+1], bytes[pos+2], bytes[pos+3]]) as usize;
    pos += 4;
    let layer_count = i16::from_be_bytes([bytes[pos], bytes[pos+1]]).abs() as usize;
    pos += 2;

    for _ in 0..layer_count {
        pos += 16; // bounds
        let channel_count = u16::from_be_bytes([bytes[pos], bytes[pos+1]]) as usize;
        pos += 2 + channel_count * 6;
        pos += 4; // blend sig
        pos += 4; // blend key
        pos += 1; // opacity
        pos += 1; // clipping
        pos += 1; // flags
        pos += 1; // filler
        let extra_len = u32::from_be_bytes([bytes[pos], bytes[pos+1], bytes[pos+2], bytes[pos+3]]) as usize;
        pos += 4;
        let extra_start = pos;
        let mask_len = u32::from_be_bytes([bytes[pos], bytes[pos+1], bytes[pos+2], bytes[pos+3]]) as usize;
        pos += 4 + mask_len;
        let blend_range_len = u32::from_be_bytes([bytes[pos], bytes[pos+1], bytes[pos+2], bytes[pos+3]]) as usize;
        pos += 4 + blend_range_len;
        let name_len = bytes[pos] as usize;
        pos += 1 + name_len;
        let pad = (4 - ((name_len + 1) % 4)) % 4;
        pos += pad;

        let mut layer_name = String::new();
        let mut has_lfx2 = false;
        let mut has_lrfx = false;
        let mut lfx2_offset = 0usize;
        let mut lfx2_len = 0usize;

        while pos < extra_start + extra_len {
            let sig = &bytes[pos..pos+4];
            if sig != b"8BIM" && sig != b"8B64" { break; }
            pos += 4;
            let key = &bytes[pos..pos+4];
            pos += 4;
            let block_len = u32::from_be_bytes([bytes[pos], bytes[pos+1], bytes[pos+2], bytes[pos+3]]) as usize;
            pos += 4;
            let block_start = pos;
            let block_data = &bytes[pos..pos+block_len];
            pos += block_len;
            if block_len % 2 != 0 { pos += 1; }

            let key_str = String::from_utf8_lossy(key);
            if key_str == "lfx2" {
                has_lfx2 = true;
                lfx2_offset = block_start;
                lfx2_len = block_len;
            } else if key_str == "lrFX" {
                has_lrfx = true;
            } else if key_str == "TySh" || key_str == "luni" {
                // unicode name
                if block_data.len() >= 4 {
                    let char_count = u32::from_be_bytes([block_data[0], block_data[1], block_data[2], block_data[3]]) as usize;
                    if block_data.len() >= 4 + char_count * 2 {
                        let mut s = String::new();
                        for i in 0..char_count {
                            let c = u16::from_be_bytes([block_data[4 + i*2], block_data[5 + i*2]]);
                            if let Some(ch) = std::char::from_u32(c as u32) {
                                s.push(ch);
                            }
                        }
                        layer_name = s;
                    }
                }
            }
        }

        if has_lfx2 && (layer_name == "text" || layer_name.contains("text")) {
            // Search for GrFl in the lfx2 block
            let lfx2_data = &bytes[lfx2_offset..lfx2_offset+lfx2_len];
            println!("\n=== Layer '{}' lfx2 block (len={}) ===", layer_name, lfx2_len);
            let keys = [b"DrSh", b"IrSh", b"OrGl", b"IrGl", b"ebbl", b"lagl", b"SoFi", b"GrFl", b"PtFl", b"FrFX", b"ChFX"];
            for key in &keys {
                let mut found = false;
                let mut offsets = Vec::new();
                for i in 0..lfx2_data.len().saturating_sub(3) {
                    if &lfx2_data[i..i+4] == *key {
                        found = true;
                        offsets.push(i);
                        if offsets.len() > 5 { break; }
                    }
                }
                if found {
                    println!("  {}: found at offsets {:?}", std::str::from_utf8(*key).unwrap(), offsets);
                }
            }
        }

        // Skip channel data (can't easily without dims, break)
        break;
    }
}