<?php
declare(strict_types=1);
/**
* Shared ?peel everything lossless, then normalize streams/rasters? path used by:
* - literal-bundle transform selection (FZB modes)
* - zip_folder per-member input (so fractal_zip sees the same unwrapped bytes as the bundle would)
*
* Order matches choose_best_literal_bundle_transform: semantic ZIP/7z/MPQ (while no pending gzip stack),
* consecutive gzip peels, then image_pac and stream multipass; repeated up to peel-stabilize rounds.
*
* @return array{0: string, 1: list<array{0: string, 1: string}>, 2: list<array{len: int, sha1: string}>}
*/
function fractal_zip_literal_deep_unwrap_with_layers(string $relPath, string $rawBytes): array {
$rawBytes = (string) $rawBytes;
$rel = str_replace('\\', '/', (string) $relPath);
$rel = trim($rel, '/');
if ($rel === '' || $rawBytes === '') {
return [$rawBytes, [], []];
}
$pathRaster = $rel;
$work = $rawBytes;
$gzipStack = [];
$semanticLayers = [];
$maxRound = fractal_zip_literal_peel_stabilize_max_rounds();
$maxSem = fractal_zip_literal_semantic_peel_max_total();
for ($r = 0; $r < $maxRound; $r++) {
$snap = $work;
$innerProgress = true;
while ($innerProgress) {
$innerProgress = false;
$w0 = $work;
while ($gzipStack === [] && count($semanticLayers) < $maxSem && fractal_zip_literal_semantic_zip_enabled()) {
$zp = fractal_zip_literal_pac_peel_zip_single_semantic($work);
if ($zp === null) {
break;
}
$semanticLayers[] = ['zip', $zp[1]];
$work = $zp[0];
$pathRaster = fractal_zip_literal_path_for_raster_pac_after_zip_strip($pathRaster);
$innerProgress = true;
}
while ($gzipStack === [] && count($semanticLayers) < $maxSem && fractal_zip_literal_semantic_7z_enabled()) {
$sp = fractal_zip_literal_pac_peel_seven_single_semantic($work);
if ($sp === null) {
break;
}
$semanticLayers[] = ['7z', $sp[1]];
$work = $sp[0];
$pathRaster = fractal_zip_literal_path_for_raster_pac_after_7z_strip($pathRaster);
$innerProgress = true;
}
while ($gzipStack === [] && count($semanticLayers) < $maxSem && fractal_zip_literal_semantic_mpq_enabled()) {
if (substr($work, 0, 3) !== 'MPQ' || !fractal_zip_literal_path_looks_mpq_semantic($pathRaster)) {
break;
}
$mp = fractal_zip_literal_pac_peel_mpq_semantic($work);
if ($mp === null) {
break;
}
$innerCandidate = $mp[0];
$alwaysPeelMpq = getenv('FRACTAL_ZIP_LITERAL_SEMANTIC_MPQ_ALWAYS') === '1';
if (!$alwaysPeelMpq) {
$pb = gzdeflate($work, 1);
$pa = gzdeflate($innerCandidate, 1);
if ($pb === false || $pa === false || strlen($pa) >= strlen($pb)) {
break;
}
}
$semanticLayers[] = ['mpq', $mp[1]];
$work = $innerCandidate;
$pathRaster = fractal_zip_literal_path_for_raster_pac_after_mpq_strip($pathRaster);
$innerProgress = true;
}
list($work, $pathRaster, $gzipStack) = fractal_zip_literal_append_consecutive_gzip_peels($pathRaster, $work, $gzipStack);
if ($work !== $w0) {
$innerProgress = true;
}
}
if ($gzipStack === []) {
$work = fractal_zip_image_pac_preprocess_literal_for_bundle($pathRaster, $work);
if (fractal_zip_literal_pac_stream_enabled()) {
$maxC = fractal_zip_literal_pac_max_compressed_bytes();
if ($maxC <= 0 || strlen($work) <= $maxC) {
$work = fractal_zip_literal_pac_preprocess_streams_multipass($pathRaster, $work);
}
}
}
if ($work === $snap) {
break;
}
}
return [$work, $semanticLayers, $gzipStack];
}
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