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zlib compression fix

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This commit is contained in:
Phillip Stephens 2025-01-02 03:39:10 -08:00
parent e1cac75d80
commit a681cef0a4
1 changed files with 15 additions and 35 deletions
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50
src/athena/Compression.cpp
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@ -10,8 +10,7 @@
namespace athena::io::Compression {
atInt32 decompressZlib(const atUint8* src, atUint32 srcLen, atUint8* dst, atUint32 dstLen) {
z_stream strm = {};
void zlibInitZStrm(const atUint8* src, atUint32 srcLen, atUint8* dst, atUint32 dstLen, z_stream& strm) {
strm.avail_in = srcLen;
strm.avail_out = dstLen;
strm.next_in = const_cast<Bytef*>(src);
@ -19,53 +18,34 @@ atInt32 decompressZlib(const atUint8* src, atUint32 srcLen, atUint8* dst, atUint
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
atInt32 ret;
// 15 window bits, and the | 16 tells zlib to to detect if using gzip or zlib
ret = inflateInit2(&strm, MAX_WBITS | 16);
}
atInt32 zlibInflate(z_stream& strm, atInt32 bits) {
atInt32 ret = inflateInit2(&strm, bits);
if (ret == Z_OK) {
ret = inflate(&strm, Z_FINISH);
if (ret == Z_STREAM_END) {
ret = strm.total_out;
}
}
inflateEnd(&strm);
return ret;
}
atInt32 compressZlib(const atUint8* src, atUint32 srcLen, atUint8* dst, atUint32 dstLen) {
atInt32 decompressZlib(const atUint8* src, atUint32 srcLen, atUint8* dst, atUint32 dstLen) {
z_stream strm = {};
strm.total_in = strm.avail_in = srcLen;
strm.total_out = strm.avail_out = dstLen;
strm.next_in = (Bytef*)src;
strm.next_out = (Bytef*)dst;
zlibInitZStrm(src, srcLen, dst, dstLen, strm);
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
atInt32 err = -1;
atInt32 ret = -1;
err = deflateInit(&strm, Z_BEST_COMPRESSION);
if (err == Z_OK) {
err = deflate(&strm, Z_FINISH);
if (err == Z_STREAM_END)
// 15 window bits, and the | 16 tells zlib to to detect if using gzip or zlib
atInt32 ret = zlibInflate(strm, MAX_WBITS | 16);
if (ret != Z_STREAM_END) {
// Try again without gzip
zlibInitZStrm(src, srcLen, dst, dstLen, strm);
ret = zlibInflate(strm, MAX_WBITS);
if (ret == Z_STREAM_END) {
ret = strm.total_out;
else {
deflateEnd(&strm);
return err;
}
} else {
deflateEnd(&strm);
return err;
ret = strm.total_out;
}
deflateEnd(&strm);
inflateEnd(&strm);
return ret;
}