mirror of
https://github.com/google/brotli.git
synced 2024-11-08 13:20:05 +00:00
353 lines
12 KiB
C++
353 lines
12 KiB
C++
#include <climits>
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#include <cstddef>
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#include <cstdio>
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#include <cstring>
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#include <fstream>
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#if !defined(_MSC_VER)
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#include <glob.h>
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#endif
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#include <vector>
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#include "deorummolae.h"
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#include "durchschlag.h"
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#include "sieve.h"
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/* This isn't a definitive list of "--foo" arguments, only those that take an
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* additional "=#" integer parameter, like "--foo=20" or "--foo=32K".
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*/
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#define LONG_ARG_BLOCK_LEN "--block_len="
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#define LONG_ARG_SLICE_LEN "--slice_len="
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#define LONG_ARG_TARGET_DICT_LEN "--target_dict_len="
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#define LONG_ARG_MIN_SLICE_POP "--min_slice_pop="
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#define LONG_ARG_CHUNK_LEN "--chunk_len="
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#define LONG_ARG_OVERLAP_LEN "--overlap_len="
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#define METHOD_DM 0
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#define METHOD_SIEVE 1
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#define METHOD_DURCHSCHLAG 2
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#define METHOD_DISTILL 3
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#define METHOD_PURIFY 4
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static size_t readInt(const char* str) {
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size_t result = 0;
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if (str[0] == 0 || str[0] == '0') {
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return 0;
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}
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for (size_t i = 0; i < 13; ++i) {
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if (str[i] == 0) {
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return result;
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}
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if (str[i] == 'k' || str[i] == 'K') {
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if ((str[i + 1] == 0) && ((result << 10) > result)) {
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return result << 10;
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}
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return 0;
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}
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if (str[i] == 'm' || str[i] == 'M') {
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if ((str[i + 1] == 0) && ((result << 20) > result)) {
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return result << 20;
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}
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return 0;
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}
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if (str[i] < '0' || str[i] > '9') {
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return 0;
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}
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size_t next = (10 * result) + (str[i] - '0');
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if (next <= result) {
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return 0;
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}
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result = next;
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}
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return 0;
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}
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static std::string readFile(const std::string& path) {
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std::ifstream file(path);
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std::string content(
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(std::istreambuf_iterator<char>(file)), std::istreambuf_iterator<char>());
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return content;
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}
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static void writeFile(const char* file, const std::string& content) {
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std::ofstream outfile(file, std::ofstream::binary);
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outfile.write(content.c_str(), static_cast<std::streamsize>(content.size()));
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outfile.close();
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}
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static void writeSamples(const std::vector<std::string>& paths,
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const std::vector<size_t>& sizes, const uint8_t* data) {
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size_t offset = 0;
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for (size_t i = 0; i < paths.size(); ++i) {
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const char* path = paths[i].c_str();
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size_t sampleSize = sizes[i];
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std::ofstream outfile(path, std::ofstream::binary);
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outfile.write(reinterpret_cast<const char*>(data + offset),
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static_cast<std::streamsize>(sampleSize));
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outfile.close();
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offset += sampleSize;
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}
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}
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/* Returns "base file name" or its tail, if it contains '/' or '\'. */
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static const char* fileName(const char* path) {
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const char* separator_position = strrchr(path, '/');
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if (separator_position) path = separator_position + 1;
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separator_position = strrchr(path, '\\');
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if (separator_position) path = separator_position + 1;
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return path;
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}
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static void printHelp(const char* name) {
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fprintf(stderr, "Usage: %s [OPTION]... DICTIONARY [SAMPLE]...\n", name);
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fprintf(stderr,
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"Options:\n"
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" --dm use 'deorummolae' engine\n"
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" --distill rewrite samples; unique text parts are removed\n"
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" --dsh use 'durchschlag' engine (default)\n"
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" --purify rewrite samples; unique text parts are zeroed out\n"
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" --sieve use 'sieve' engine\n"
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" -b#, --block_len=#\n"
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" set block length for 'durchschlag'; default: 1024\n"
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" -s#, --slice_len=#\n"
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" set slice length for 'distill', 'durchschlag', 'purify'\n"
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" and 'sieve'; default: 16\n"
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" -t#, --target_dict_len=#\n"
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" set target dictionary length (limit); default: 16K\n"
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" -u#, --min_slice_pop=#\n"
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" set minimum slice population (for rewrites); default: 2\n"
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" -c#, --chunk_len=#\n"
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" if positive, samples are cut into chunks of this length;\n"
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" default: 0; cannot mix with 'rewrite samples'\n"
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" -o#, --overlap_len=#\n"
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" set chunk overlap length; default 0\n"
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"# is a decimal number with optional k/K/m/M suffix.\n"
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"WARNING: 'distill' and 'purify' will overwrite original samples!\n"
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" Completely unique samples might become empty files.\n\n");
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}
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int main(int argc, char const* argv[]) {
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int dictionaryArg = -1;
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int method = METHOD_DURCHSCHLAG;
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size_t sliceLen = 16;
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size_t targetSize = 16 << 10;
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size_t blockSize = 1024;
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size_t minimumPopulation = 2;
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size_t chunkLen = 0;
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size_t overlapLen = 0;
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std::vector<uint8_t> data;
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std::vector<size_t> sizes;
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std::vector<std::string> paths;
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size_t total = 0;
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for (int i = 1; i < argc; ++i) {
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if (argv[i] == nullptr) {
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continue;
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}
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if (argv[i][0] == '-') {
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char arg1 = argv[i][1];
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const char* arg2 = arg1 ? &argv[i][2] : nullptr;
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if (arg1 == '-') {
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if (dictionaryArg != -1) {
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fprintf(stderr,
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"Method should be specified before dictionary / sample '%s'\n",
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argv[i]);
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exit(1);
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}
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/* Look for "--long_arg" via exact match. */
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if (std::strcmp(argv[i], "--sieve") == 0) {
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method = METHOD_SIEVE;
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continue;
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}
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if (std::strcmp(argv[i], "--dm") == 0) {
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method = METHOD_DM;
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continue;
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}
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if (std::strcmp(argv[i], "--dsh") == 0) {
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method = METHOD_DURCHSCHLAG;
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continue;
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}
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if (std::strcmp(argv[i], "--distill") == 0) {
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method = METHOD_DISTILL;
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continue;
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}
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if (std::strcmp(argv[i], "--purify") == 0) {
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method = METHOD_PURIFY;
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continue;
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}
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/* Look for "--long_arg=#" via prefix match. */
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if (std::strncmp(argv[i], LONG_ARG_BLOCK_LEN,
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std::strlen(LONG_ARG_BLOCK_LEN)) == 0) {
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arg1 = 'b';
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arg2 = &argv[i][std::strlen(LONG_ARG_BLOCK_LEN)];
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} else if (std::strncmp(argv[i], LONG_ARG_SLICE_LEN,
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std::strlen(LONG_ARG_SLICE_LEN)) == 0) {
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arg1 = 's';
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arg2 = &argv[i][std::strlen(LONG_ARG_SLICE_LEN)];
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} else if (std::strncmp(argv[i], LONG_ARG_TARGET_DICT_LEN,
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std::strlen(LONG_ARG_TARGET_DICT_LEN)) == 0) {
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arg1 = 't';
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arg2 = &argv[i][std::strlen(LONG_ARG_TARGET_DICT_LEN)];
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} else if (std::strncmp(argv[i], LONG_ARG_MIN_SLICE_POP,
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std::strlen(LONG_ARG_MIN_SLICE_POP)) == 0) {
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arg1 = 'u';
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arg2 = &argv[i][std::strlen(LONG_ARG_MIN_SLICE_POP)];
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} else if (std::strncmp(argv[i], LONG_ARG_CHUNK_LEN,
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std::strlen(LONG_ARG_CHUNK_LEN)) == 0) {
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arg1 = 'c';
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arg2 = &argv[i][std::strlen(LONG_ARG_CHUNK_LEN)];
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} else if (std::strncmp(argv[i], LONG_ARG_OVERLAP_LEN,
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std::strlen(LONG_ARG_OVERLAP_LEN)) == 0) {
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arg1 = 'o';
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arg2 = &argv[i][std::strlen(LONG_ARG_OVERLAP_LEN)];
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} else {
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printHelp(fileName(argv[0]));
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fprintf(stderr, "Invalid option '%s'\n", argv[i]);
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exit(1);
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}
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}
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/* Look for "-f" short args or "--foo=#" long args. */
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if (arg1 == 'b') {
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blockSize = readInt(arg2);
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if (blockSize < 16 || blockSize > 65536) {
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printHelp(fileName(argv[0]));
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fprintf(stderr, "Invalid option '%s'\n", argv[i]);
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exit(1);
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}
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} else if (arg1 == 's') {
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sliceLen = readInt(arg2);
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// TODO(eustas): investigate why sliceLen == 4..5 greatly slows down
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// durschlag engine, but only from command line;
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// durschlag_runner seems to work fine with those.
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if (sliceLen < 4 || sliceLen > 256) {
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printHelp(fileName(argv[0]));
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fprintf(stderr, "Invalid option '%s'\n", argv[i]);
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exit(1);
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}
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} else if (arg1 == 't') {
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targetSize = readInt(arg2);
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if (targetSize < 256 || targetSize > (1 << 25)) {
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printHelp(fileName(argv[0]));
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fprintf(stderr, "Invalid option '%s'\n", argv[i]);
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exit(1);
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}
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} else if (arg1 == 'u') {
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minimumPopulation = readInt(arg2);
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if (minimumPopulation < 256 || minimumPopulation > 65536) {
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printHelp(fileName(argv[0]));
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fprintf(stderr, "Invalid option '%s'\n", argv[i]);
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exit(1);
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}
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} else if (arg1 == 'c') {
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chunkLen = readInt(arg2);
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if (chunkLen < 0 || chunkLen > INT_MAX) {
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printHelp(fileName(argv[0]));
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fprintf(stderr, "Invalid option '%s'\n", argv[i]);
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exit(1);
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}
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} else if (arg1 == 'o') {
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overlapLen = readInt(arg2);
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if (overlapLen < 0 || overlapLen > INT_MAX) {
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printHelp(fileName(argv[0]));
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fprintf(stderr, "Invalid option '%s'\n", argv[i]);
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exit(1);
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}
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} else {
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printHelp(fileName(argv[0]));
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fprintf(stderr, "Unrecognized option '%s'\n", argv[i]);
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exit(1);
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}
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continue;
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}
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if (dictionaryArg == -1) {
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if (method != METHOD_DISTILL && method != METHOD_PURIFY) {
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dictionaryArg = i;
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continue;
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}
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}
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bool ok = true;
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#if defined(_MSC_VER)
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const char* resolved_path = argv[i];
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#else
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glob_t resolved_paths;
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memset(&resolved_paths, 0, sizeof(resolved_paths));
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if (glob(argv[i], GLOB_TILDE, NULL, &resolved_paths) == 0) {
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for(size_t j = 0; j < resolved_paths.gl_pathc; ++j) {
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const char* resolved_path = resolved_paths.gl_pathv[j];
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#endif
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std::string content = readFile(resolved_path);
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if (chunkLen == 0) {
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paths.emplace_back(resolved_path);
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data.insert(data.end(), content.begin(), content.end());
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total += content.size();
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sizes.push_back(content.size());
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continue;
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} else if (chunkLen <= overlapLen) {
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printHelp(fileName(argv[0]));
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fprintf(stderr, "Invalid chunkLen - overlapLen combination\n");
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exit(1);
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}
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for (size_t chunkStart = 0;
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chunkStart < content.size();
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chunkStart += chunkLen - overlapLen) {
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std::string chunk = content.substr(chunkStart, chunkLen);
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data.insert(data.end(), chunk.begin(), chunk.end());
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total += chunk.size();
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sizes.push_back(chunk.size());
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}
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#if !defined(_MSC_VER)
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}
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} else {
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ok = false;
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}
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globfree(&resolved_paths);
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#endif
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if (!ok) exit(1);
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}
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fprintf(stderr, "Number of chunks: %zu; total size: %zu\n", sizes.size(),
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total);
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bool wantDictionary = (dictionaryArg == -1);
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if (method == METHOD_DISTILL || method == METHOD_PURIFY) {
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wantDictionary = false;
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if (chunkLen != 0) {
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printHelp(fileName(argv[0]));
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fprintf(stderr, "Cannot mix 'rewrite samples' with positive chunk_len\n");
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exit(1);
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}
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}
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if (wantDictionary || total == 0) {
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printHelp(fileName(argv[0]));
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fprintf(stderr, "Not enough arguments\n");
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exit(1);
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}
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if (method == METHOD_SIEVE) {
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writeFile(argv[dictionaryArg], sieve_generate(
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targetSize, sliceLen, sizes, data.data()));
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} else if (method == METHOD_DM) {
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writeFile(argv[dictionaryArg], DM_generate(
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targetSize, sizes, data.data()));
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} else if (method == METHOD_DURCHSCHLAG) {
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writeFile(argv[dictionaryArg], durchschlag_generate(
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targetSize, sliceLen, blockSize, sizes, data.data()));
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} else if (method == METHOD_DISTILL) {
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durchschlag_distill(sliceLen, minimumPopulation, &sizes, data.data());
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writeSamples(paths, sizes, data.data());
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} else if (method == METHOD_PURIFY) {
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durchschlag_purify(sliceLen, minimumPopulation, sizes, data.data());
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writeSamples(paths, sizes, data.data());
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} else {
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printHelp(fileName(argv[0]));
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fprintf(stderr, "Unknown generator\n");
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exit(1);
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}
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return 0;
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}
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