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-rw-r--r--src/lzma/options.c346
1 files changed, 346 insertions, 0 deletions
diff --git a/src/lzma/options.c b/src/lzma/options.c
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+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file options.c
+/// \brief Parser for filter-specific options
+//
+// Copyright (C) 2007 Lasse Collin
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; either
+// version 2.1 of the License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+// Lesser General Public License for more details.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "private.h"
+
+
+///////////////////
+// Generic stuff //
+///////////////////
+
+typedef struct {
+ const char *name;
+ uint64_t id;
+} name_id_map;
+
+
+typedef struct {
+ const char *name;
+ const name_id_map *map;
+ uint64_t min;
+ uint64_t max;
+} option_map;
+
+
+/// Parses option=value pairs that are separated with colons, semicolons,
+/// or commas: opt=val:opt=val;opt=val,opt=val
+///
+/// Each option is a string, that is converted to an integer using the
+/// index where the option string is in the array.
+///
+/// Value can be either a number with minimum and maximum value limit, or
+/// a string-id map mapping a list of possible string values to integers.
+///
+/// When parsing both option and value succeed, a filter-specific function
+/// is called, which should update the given value to filter-specific
+/// options structure.
+///
+/// \param str String containing the options from the command line
+/// \param opts Filter-specific option map
+/// \param set Filter-specific function to update filter_options
+/// \param filter_options Pointer to filter-specific options structure
+///
+/// \return Returns only if no errors occur.
+///
+static void
+parse_options(const char *str, const option_map *opts,
+ void (*set)(void *filter_options,
+ uint32_t key, uint64_t value),
+ void *filter_options)
+{
+ if (str == NULL || str[0] == '\0')
+ return;
+
+ char *s = xstrdup(str);
+ char *name = s;
+
+ while (true) {
+ char *split = strchr(name, ',');
+ if (split != NULL)
+ *split = '\0';
+
+ char *value = strchr(name, '=');
+ if (value != NULL)
+ *value++ = '\0';
+
+ if (value == NULL || value[0] == '\0') {
+ errmsg(V_ERROR, _("%s: Options must be `name=value' "
+ "pairs separated with commas"),
+ str);
+ my_exit(ERROR);
+ }
+
+ // Look for the option name from the option map.
+ bool found = false;
+ for (size_t i = 0; opts[i].name != NULL; ++i) {
+ if (strcmp(name, opts[i].name) != 0)
+ continue;
+
+ if (opts[i].map == NULL) {
+ // value is an integer.
+ const uint64_t v = str_to_uint64(name, value,
+ opts[i].min, opts[i].max);
+ set(filter_options, i, v);
+ } else {
+ // value is a string which we should map
+ // to an integer.
+ size_t j;
+ for (j = 0; opts[i].map[j].name != NULL; ++j) {
+ if (strcmp(opts[i].map[j].name, value)
+ == 0)
+ break;
+ }
+
+ if (opts[i].map[j].name == NULL) {
+ errmsg(V_ERROR, _("%s: Invalid option "
+ "value"), value);
+ my_exit(ERROR);
+ }
+
+ set(filter_options, i, j);
+ }
+
+ found = true;
+ break;
+ }
+
+ if (!found) {
+ errmsg(V_ERROR, _("%s: Invalid option name"), name);
+ my_exit(ERROR);
+ }
+
+ if (split == NULL)
+ break;
+
+ name = split + 1;
+ }
+
+ free(s);
+ return;
+}
+
+
+//////////////
+// Subblock //
+//////////////
+
+enum {
+ OPT_SIZE,
+ OPT_RLE,
+ OPT_ALIGN,
+};
+
+
+static void
+set_subblock(void *options, uint32_t key, uint64_t value)
+{
+ lzma_options_subblock *opt = options;
+
+ switch (key) {
+ case OPT_SIZE:
+ opt->subblock_data_size = value;
+ break;
+
+ case OPT_RLE:
+ opt->rle = value;
+ break;
+
+ case OPT_ALIGN:
+ opt->alignment = value;
+ break;
+ }
+}
+
+
+extern lzma_options_subblock *
+parse_options_subblock(const char *str)
+{
+ static const option_map opts[] = {
+ { "size", NULL, LZMA_SUBBLOCK_DATA_SIZE_MIN,
+ LZMA_SUBBLOCK_DATA_SIZE_MAX },
+ { "rle", NULL, LZMA_SUBBLOCK_RLE_OFF,
+ LZMA_SUBBLOCK_RLE_MAX },
+ { "align",NULL, LZMA_SUBBLOCK_ALIGNMENT_MIN,
+ LZMA_SUBBLOCK_ALIGNMENT_MAX },
+ { NULL, NULL, 0, 0 }
+ };
+
+ lzma_options_subblock *options
+ = xmalloc(sizeof(lzma_options_subblock));
+ *options = (lzma_options_subblock){
+ .allow_subfilters = false,
+ .alignment = LZMA_SUBBLOCK_ALIGNMENT_DEFAULT,
+ .subblock_data_size = LZMA_SUBBLOCK_DATA_SIZE_DEFAULT,
+ .rle = LZMA_SUBBLOCK_RLE_OFF,
+ };
+
+ parse_options(str, opts, &set_subblock, options);
+
+ return options;
+}
+
+
+///////////
+// Delta //
+///////////
+
+enum {
+ OPT_DISTANCE,
+};
+
+
+static void
+set_delta(void *options, uint32_t key, uint64_t value)
+{
+ lzma_options_delta *opt = options;
+ switch (key) {
+ case OPT_DISTANCE:
+ opt->distance = value;
+ break;
+ }
+}
+
+
+extern lzma_options_delta *
+parse_options_delta(const char *str)
+{
+ static const option_map opts[] = {
+ { "distance", NULL, LZMA_DELTA_DISTANCE_MIN,
+ LZMA_DELTA_DISTANCE_MAX },
+ { NULL, NULL, 0, 0 }
+ };
+
+ lzma_options_delta *options = xmalloc(sizeof(lzma_options_subblock));
+ *options = (lzma_options_delta){
+ // It's hard to give a useful default for this.
+ .distance = LZMA_DELTA_DISTANCE_MIN,
+ };
+
+ parse_options(str, opts, &set_delta, options);
+
+ return options;
+}
+
+
+//////////
+// LZMA //
+//////////
+
+enum {
+ OPT_DICT,
+ OPT_LC,
+ OPT_LP,
+ OPT_PB,
+ OPT_MODE,
+ OPT_FB,
+ OPT_MF,
+ OPT_MC
+};
+
+
+static void
+set_lzma(void *options, uint32_t key, uint64_t value)
+{
+ lzma_options_lzma *opt = options;
+
+ switch (key) {
+ case OPT_DICT:
+ opt->dictionary_size = value;
+ break;
+
+ case OPT_LC:
+ opt->literal_context_bits = value;
+ break;
+
+ case OPT_LP:
+ opt->literal_pos_bits = value;
+ break;
+
+ case OPT_PB:
+ opt->pos_bits = value;
+ break;
+
+ case OPT_MODE:
+ opt->mode = value;
+ break;
+
+ case OPT_FB:
+ opt->fast_bytes = value;
+ break;
+
+ case OPT_MF:
+ opt->match_finder = value;
+ break;
+
+ case OPT_MC:
+ opt->match_finder_cycles = value;
+ break;
+ }
+}
+
+
+extern lzma_options_lzma *
+parse_options_lzma(const char *str)
+{
+ static const name_id_map modes[] = {
+ { "fast", LZMA_MODE_FAST },
+ { "best", LZMA_MODE_BEST },
+ { NULL, 0 }
+ };
+
+ static const name_id_map mfs[] = {
+ { "hc3", LZMA_MF_HC3 },
+ { "hc4", LZMA_MF_HC4 },
+ { "bt2", LZMA_MF_BT2 },
+ { "bt3", LZMA_MF_BT3 },
+ { "bt4", LZMA_MF_BT4 },
+ { NULL, 0 }
+ };
+
+ static const option_map opts[] = {
+ { "dict", NULL, LZMA_DICTIONARY_SIZE_MIN,
+ LZMA_DICTIONARY_SIZE_MAX },
+ { "lc", NULL, LZMA_LITERAL_CONTEXT_BITS_MIN,
+ LZMA_LITERAL_CONTEXT_BITS_MAX },
+ { "lp", NULL, LZMA_LITERAL_POS_BITS_MIN,
+ LZMA_LITERAL_POS_BITS_MAX },
+ { "pb", NULL, LZMA_POS_BITS_MIN, LZMA_POS_BITS_MAX },
+ { "mode", modes, 0, 0 },
+ { "fb", NULL, LZMA_FAST_BYTES_MIN, LZMA_FAST_BYTES_MAX },
+ { "mf", mfs, 0, 0 },
+ { "mc", NULL, 0, UINT32_MAX },
+ { NULL, NULL, 0, 0 }
+ };
+
+ lzma_options_lzma *options = xmalloc(sizeof(lzma_options_lzma));
+ *options = (lzma_options_lzma){
+ .dictionary_size = LZMA_DICTIONARY_SIZE_DEFAULT,
+ .literal_context_bits = LZMA_LITERAL_CONTEXT_BITS_DEFAULT,
+ .literal_pos_bits = LZMA_LITERAL_POS_BITS_DEFAULT,
+ .pos_bits = LZMA_POS_BITS_DEFAULT,
+ .mode = LZMA_MODE_BEST,
+ .fast_bytes = LZMA_FAST_BYTES_DEFAULT,
+ .match_finder = LZMA_MF_BT4,
+ .match_finder_cycles = 0,
+ };
+
+ parse_options(str, opts, &set_lzma, options);
+
+ return options;
+}
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