67 lines
1.4 KiB
C++
67 lines
1.4 KiB
C++
#include <cstdio>
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#include <cstdlib>
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#include <cassert>
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#include <string>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <kj/io.h>
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#include <capnp/serialize.h>
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int main(int argc, char** argv) {
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if (argc != 3) {
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printf("usage: %s <log_path> <index_output_path>\n", argv[0]);
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return 1;
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}
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const std::string log_fn = argv[1];
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const std::string index_fn = argv[2];
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int log_fd = open(log_fn.c_str(), O_RDONLY, 0);
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assert(log_fd >= 0);
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off_t log_size = lseek(log_fd, 0, SEEK_END);
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lseek(log_fd, 0, SEEK_SET);
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FILE* index_f = NULL;
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if (index_fn == "-") {
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index_f = stdout;
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} else {
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index_f = fopen(index_fn.c_str(), "wb");
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}
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assert(index_f);
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void* log_data = mmap(NULL, log_size, PROT_READ, MAP_PRIVATE, log_fd, 0);
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assert(log_data);
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auto words = kj::arrayPtr((const capnp::word*)log_data, log_size/sizeof(capnp::word));
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while (words.size() > 0) {
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uint64_t idx = ((uintptr_t)words.begin() - (uintptr_t)log_data);
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// printf("%llu - %ld\n", idx, words.size());
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const char* idx_bytes = (const char*)&idx;
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fwrite(idx_bytes, 8, 1, index_f);
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try {
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capnp::FlatArrayMessageReader reader(words);
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words = kj::arrayPtr(reader.getEnd(), words.end());
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} catch (kj::Exception exc) {
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break;
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}
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}
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munmap(log_data, log_size);
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fclose(index_f);
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close(log_fd);
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return 0;
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}
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