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write decompression logic up to the point of hanelling the buffer.

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Quinn
2025-09-10 12:52:35 +02:00
parent 07f4ea34d2
commit f0d14e76b2
1 changed files with 35 additions and 14 deletions
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49
src/dat/mcx.c
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@@ -26,7 +26,7 @@ enum mcx_compression {
};
/* first 4 bytes is an i32 indicating remaining bytes, the following byte defines the compression scheme */
static void mcx_loadchunk(const u8 *restrict buf, const i32 *restrict table, int idx) {
static int mcx_loadchunk(const u8 *restrict buf, const i32 *restrict table, int idx) {
const u8 *chunk = buf + (be32toh(table[idx]) >> 8) * SECTOR;
i32 len;
@@ -34,20 +34,41 @@ static void mcx_loadchunk(const u8 *restrict buf, const i32 *restrict table, int
len = be32toh(len);
chunk += 4;
if (*chunk != MCX_COMPRESSION_CUSTOM) {
struct archive *archive = archive_read_new();
archive_read_support_format_raw(archive);
switch (*chunk) {
case MCX_COMPRESSION_GZIP: archive_read_support_filter_gzip(archive); break;
case MCX_COMPRESSION_ZLIB: archive_read_support_filter_zlib(archive); break; // BUG: this does not exist, but will have to do for now
case MCX_COMPRESSION_LZ4: archive_read_support_filter_lz4(archive); break;
case MCX_COMPRESSION_CUSTOM: // TODO: implement using filtering any format
default: fatal("compression type of '%ihh' is unsupported!", *chunk);
}
// TODO: implement decompression, somehow.
// https://github.com/libarchive/libarchive/wiki/Examples#user-content-A_Universal_Decompressor
struct archive *archive = archive_read_new();
archive_read_support_format_raw(archive);
switch (*chunk) {
case MCX_COMPRESSION_GZIP: /* fall-through; ZLIB is handled under the GZIP filter */
case MCX_COMPRESSION_ZLIB: archive_read_support_filter_gzip(archive); break;
case MCX_COMPRESSION_NONE: archive_read_support_filter_none(archive); break;
case MCX_COMPRESSION_LZ4: archive_read_support_filter_lz4(archive); break;
case MCX_COMPRESSION_CUSTOM: archive_read_support_filter_all(archive); break;
default: fatal("compression type of '%i' is unsupported!", *chunk);
}
if (archive_read_open_memory(archive, chunk, len) != ARCHIVE_OK) {
error("failed to decompress %i bytes of compression type %i", len, *chunk);
return 1;
}
struct archive_entry *entry;
if (archive_read_next_header(archive, &entry) != ARCHIVE_OK) {
error("failed to decompress %i bytes of compression type %i", len, *chunk);
return 1;
}
ssize_t size = -1;
for (;;) {
// TODO: handle buffer
// size = archive_read_data(archive, , );
if (size < 0) {
error("failed to decompress %i bytes of compression type %i", len, *chunk);
return 1;
}
if (size == 0) break;
// TODO: handle data
}
return 0;
}
/* Moves chunks `src_s` to `src_e` (inclusive) from `src`, back onto `dst`. */