return compressed_size;
}
-static bool
-lzx_params_valid(const struct wimlib_lzx_compressor_params *params)
-{
- /* Validate parameters. */
- if (params->hdr.size != sizeof(struct wimlib_lzx_compressor_params)) {
- LZX_DEBUG("Invalid parameter structure size!");
- return false;
- }
-
- if (params->algorithm != WIMLIB_LZX_ALGORITHM_SLOW &&
- params->algorithm != WIMLIB_LZX_ALGORITHM_FAST)
- {
- LZX_DEBUG("Invalid algorithm.");
- return false;
- }
-
- if (params->algorithm == WIMLIB_LZX_ALGORITHM_SLOW) {
- if (params->alg_params.slow.num_optim_passes < 1)
- {
- LZX_DEBUG("Invalid number of optimization passes!");
- return false;
- }
-
- if (params->alg_params.slow.main_nostat_cost < 1 ||
- params->alg_params.slow.main_nostat_cost > 16)
- {
- LZX_DEBUG("Invalid main_nostat_cost!");
- return false;
- }
-
- if (params->alg_params.slow.len_nostat_cost < 1 ||
- params->alg_params.slow.len_nostat_cost > 16)
- {
- LZX_DEBUG("Invalid len_nostat_cost!");
- return false;
- }
-
- if (params->alg_params.slow.aligned_nostat_cost < 1 ||
- params->alg_params.slow.aligned_nostat_cost > 8)
- {
- LZX_DEBUG("Invalid aligned_nostat_cost!");
- return false;
- }
- }
- return true;
-}
-
static void
lzx_free_compressor(void *_ctx)
{
}
}
+static const struct wimlib_lzx_compressor_params lzx_fast_default = {
+ .hdr = {
+ .size = sizeof(struct wimlib_lzx_compressor_params),
+ },
+ .algorithm = WIMLIB_LZX_ALGORITHM_FAST,
+ .use_defaults = 0,
+ .alg_params = {
+ .fast = {
+ },
+ },
+};
+static const struct wimlib_lzx_compressor_params lzx_slow_default = {
+ .hdr = {
+ .size = sizeof(struct wimlib_lzx_compressor_params),
+ },
+ .algorithm = WIMLIB_LZX_ALGORITHM_SLOW,
+ .use_defaults = 0,
+ .alg_params = {
+ .slow = {
+ .use_len2_matches = 1,
+ .nice_match_length = 32,
+ .num_optim_passes = 2,
+ .max_search_depth = 50,
+ .max_matches_per_pos = 3,
+ .main_nostat_cost = 15,
+ .len_nostat_cost = 15,
+ .aligned_nostat_cost = 7,
+ },
+ },
+};
+
+static const struct wimlib_lzx_compressor_params *
+lzx_get_params(const struct wimlib_compressor_params_header *_params)
+{
+ const struct wimlib_lzx_compressor_params *params =
+ (const struct wimlib_lzx_compressor_params*)_params;
+
+ if (params == NULL) {
+ LZX_DEBUG("Using default algorithm and parameters.");
+ params = &lzx_slow_default;
+ } else {
+ if (params->use_defaults) {
+ if (params->algorithm == WIMLIB_LZX_ALGORITHM_SLOW)
+ params = &lzx_slow_default;
+ else
+ params = &lzx_fast_default;
+ }
+ }
+ return params;
+}
+
static int
lzx_create_compressor(size_t window_size,
const struct wimlib_compressor_params_header *_params,
void **ctx_ret)
{
- const struct wimlib_lzx_compressor_params *params =
- (const struct wimlib_lzx_compressor_params*)_params;
+ const struct wimlib_lzx_compressor_params *params = lzx_get_params(_params);
struct lzx_compressor *ctx;
LZX_DEBUG("Allocating LZX context...");
if (!lzx_window_size_valid(window_size))
return WIMLIB_ERR_INVALID_PARAM;
- static const struct wimlib_lzx_compressor_params fast_default = {
- .hdr = {
- .size = sizeof(struct wimlib_lzx_compressor_params),
- },
- .algorithm = WIMLIB_LZX_ALGORITHM_FAST,
- .use_defaults = 0,
- .alg_params = {
- .fast = {
- },
- },
- };
- static const struct wimlib_lzx_compressor_params slow_default = {
- .hdr = {
- .size = sizeof(struct wimlib_lzx_compressor_params),
- },
- .algorithm = WIMLIB_LZX_ALGORITHM_SLOW,
- .use_defaults = 0,
- .alg_params = {
- .slow = {
- .use_len2_matches = 1,
- .nice_match_length = 32,
- .num_optim_passes = 2,
- .max_search_depth = 50,
- .max_matches_per_pos = 3,
- .main_nostat_cost = 15,
- .len_nostat_cost = 15,
- .aligned_nostat_cost = 7,
- },
- },
- };
-
- if (params) {
- if (!lzx_params_valid(params))
- return WIMLIB_ERR_INVALID_PARAM;
- } else {
- LZX_DEBUG("Using default algorithm and parameters.");
- params = &slow_default;
- }
-
- if (params->use_defaults) {
- if (params->algorithm == WIMLIB_LZX_ALGORITHM_SLOW)
- params = &slow_default;
- else
- params = &fast_default;
- }
-
LZX_DEBUG("Allocating memory.");
ctx = CALLOC(1, sizeof(struct lzx_compressor));
return WIMLIB_ERR_NOMEM;
}
+static u64
+lzx_get_needed_memory(size_t max_block_size,
+ const struct wimlib_compressor_params_header *_params)
+{
+ const struct wimlib_lzx_compressor_params *params = lzx_get_params(_params);
+
+ u64 size = 0;
+
+ size += sizeof(struct lzx_compressor);
+
+ size += max_block_size + 12;
+
+ size += DIV_ROUND_UP(max_block_size, LZX_DIV_BLOCK_SIZE) *
+ sizeof(((struct lzx_compressor*)0)->block_specs[0]);
+
+ if (params->algorithm == WIMLIB_LZX_ALGORITHM_SLOW) {
+ size += max_block_size * sizeof(((struct lzx_compressor*)0)->chosen_matches[0]);
+ size += lz_sarray_get_needed_memory(max_block_size);
+ size += lz_match_chooser_get_needed_memory(LZX_OPTIM_ARRAY_SIZE,
+ params->alg_params.slow.nice_match_length,
+ LZX_MAX_MATCH_LEN);
+ u32 cache_per_pos;
+
+ cache_per_pos = params->alg_params.slow.max_matches_per_pos;
+ if (cache_per_pos > LZX_MAX_CACHE_PER_POS)
+ cache_per_pos = LZX_MAX_CACHE_PER_POS;
+
+ size += max_block_size * (cache_per_pos + 1) *
+ sizeof(((struct lzx_compressor*)0)->cached_matches[0]);
+ } else {
+ size += max_block_size * sizeof(((struct lzx_compressor*)0)->prev_tab[0]);
+ }
+ return size;
+}
+
+static bool
+lzx_params_valid(const struct wimlib_compressor_params_header *_params)
+{
+ const struct wimlib_lzx_compressor_params *params =
+ (const struct wimlib_lzx_compressor_params*)_params;
+
+ if (params->hdr.size != sizeof(struct wimlib_lzx_compressor_params)) {
+ LZX_DEBUG("Invalid parameter structure size!");
+ return false;
+ }
+
+ if (params->algorithm != WIMLIB_LZX_ALGORITHM_SLOW &&
+ params->algorithm != WIMLIB_LZX_ALGORITHM_FAST)
+ {
+ LZX_DEBUG("Invalid algorithm.");
+ return false;
+ }
+
+ if (params->algorithm == WIMLIB_LZX_ALGORITHM_SLOW &&
+ !params->use_defaults)
+ {
+ if (params->alg_params.slow.num_optim_passes < 1)
+ {
+ LZX_DEBUG("Invalid number of optimization passes!");
+ return false;
+ }
+
+ if (params->alg_params.slow.main_nostat_cost < 1 ||
+ params->alg_params.slow.main_nostat_cost > 16)
+ {
+ LZX_DEBUG("Invalid main_nostat_cost!");
+ return false;
+ }
+
+ if (params->alg_params.slow.len_nostat_cost < 1 ||
+ params->alg_params.slow.len_nostat_cost > 16)
+ {
+ LZX_DEBUG("Invalid len_nostat_cost!");
+ return false;
+ }
+
+ if (params->alg_params.slow.aligned_nostat_cost < 1 ||
+ params->alg_params.slow.aligned_nostat_cost > 8)
+ {
+ LZX_DEBUG("Invalid aligned_nostat_cost!");
+ return false;
+ }
+ }
+ return true;
+}
+
+
const struct compressor_ops lzx_compressor_ops = {
+ .params_valid = lzx_params_valid,
+ .get_needed_memory = lzx_get_needed_memory,
.create_compressor = lzx_create_compressor,
.compress = lzx_compress,
.free_compressor = lzx_free_compressor,
git://wimlib.net / wimlib / blobdiff