Function Zip_ReadLocalFileHeader

src/Deflate.c:1164–1222

};

static cc_result Zip_ReadLocalFileHeader(struct ZipState* state, struct ZipEntry* entry) {
	struct Stream* stream = state->source;
	cc_uint8 header[26];
	cc_string path; char pathBuffer[ZIP_MAXNAMELEN];
	cc_uint32 compressedSize, uncompressedSize;
	int method, pathLen, extraLen;
	struct Stream portion, compStream;
#if CC_BUILD_MAXSTACK <= (64 * 1024)
	struct InflateState* inflate;
#else
	struct InflateState inflate;
#endif
	cc_result res;

	if ((res = Stream_Read(stream, header, sizeof(header)))) return res;
	pathLen  = Stream_GetU16_LE(&header[22]);
	if (pathLen > ZIP_MAXNAMELEN) return ZIP_ERR_FILENAME_LEN;

	/* NOTE: ZIP spec says path uses code page 437 for encoding */
	path = String_Init(pathBuffer, pathLen, pathLen);	
	if ((res = Stream_Read(stream, (cc_uint8*)pathBuffer, pathLen))) return res;
	if (!state->SelectEntry(&path)) return 0;

	extraLen = Stream_GetU16_LE(&header[24]);
	/* local file may have extra data before actual data (e.g. ZIP64) */
	if ((res = stream->Skip(stream, extraLen))) return res;

	method           = Stream_GetU16_LE(&header[4]);
	compressedSize   = Stream_GetU32_LE(&header[14]);
	uncompressedSize = Stream_GetU32_LE(&header[18]);

	/* Some .zip files don't set these in local file header */
	if (!compressedSize)   compressedSize   = entry->CompressedSize;
	if (!uncompressedSize) uncompressedSize = entry->UncompressedSize;

	if (method == 0) {
		Stream_ReadonlyPortion(&portion, stream, uncompressedSize);
		res = state->ProcessEntry(&path, &portion, entry);
	} else if (method == 8) {
		Stream_ReadonlyPortion(&portion, stream, compressedSize);

#if CC_BUILD_MAXSTACK <= (64 * 1024)
		inflate = (struct InflateState*)Mem_TryAlloc(1, sizeof(struct InflateState));
		if (!inflate) return ERR_OUT_OF_MEMORY;

		Inflate_MakeStream2(&compStream, inflate, &portion);
		res = state->ProcessEntry(&path, &compStream, entry);
		Mem_Free(inflate);
#else
		Inflate_MakeStream2(&compStream, &inflate, &portion);
		res = state->ProcessEntry(&path, &compStream, entry);	
#endif
	} else {
		Platform_Log1("Unsupported.zip entry compression method: %i", &method);
		/* TODO: Should this be an error */
		res = 0;
	}
	return res;