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| 1 | +/****************************************************************************** |
| 2 | + * |
| 3 | + * Project: MapCache |
| 4 | + * Purpose: Extract raw value of a single key from a LMDB database |
| 5 | + * Author: Maris Nartiss |
| 6 | + * |
| 7 | + ****************************************************************************** |
| 8 | + * Copyright (c) 2025 Regents of the University of Minnesota. |
| 9 | + * |
| 10 | + * Permission is hereby granted, free of charge, to any person obtaining a |
| 11 | + * copy of this software and associated documentation files (the "Software"), |
| 12 | + * to deal in the Software without restriction, including without limitation |
| 13 | + * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| 14 | + * and/or sell copies of the Software, and to permit persons to whom the |
| 15 | + * Software is furnished to do so, subject to the following conditions: |
| 16 | + * |
| 17 | + * The above copyright notice and this permission notice shall be included in |
| 18 | + * all copies of this Software or works derived from this Software. |
| 19 | + * |
| 20 | + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| 21 | + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 22 | + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 23 | + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 24 | + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| 25 | + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
| 26 | + * DEALINGS IN THE SOFTWARE. |
| 27 | + ****************************************************************************/ |
| 28 | + |
| 29 | +#include <stdio.h> |
| 30 | +#include <stdlib.h> |
| 31 | +#include <string.h> |
| 32 | +#include <apr_time.h> |
| 33 | +#include <apr_getopt.h> |
| 34 | +#include <apr_pools.h> |
| 35 | +#include <apr_date.h> |
| 36 | +#include "lmdb.h" |
| 37 | + |
| 38 | +void fail(const char *msg, int rc) { |
| 39 | + fprintf(stderr, "%s: %s\n", msg, mdb_strerror(rc)); |
| 40 | + exit(EXIT_FAILURE); |
| 41 | +} |
| 42 | + |
| 43 | +static const apr_getopt_option_t options[] = { |
| 44 | + { "dbpath", 'd', TRUE, "Path to the LMDB database directory" }, |
| 45 | + { "key", 'k', TRUE, "Key to retrieve" }, |
| 46 | + { "output", 'o', TRUE, "Output file (default: output.bin)" }, |
| 47 | + { "help", 'h', FALSE, "Show help" }, |
| 48 | + { NULL, 0, 0, NULL } |
| 49 | +}; |
| 50 | + |
| 51 | +void usage(const char *progname) { |
| 52 | + int i = 0; |
| 53 | + printf("usage: %s options\n", progname); |
| 54 | + while (options[i].name) { |
| 55 | + if (options[i].optch < 256) { |
| 56 | + if (options[i].has_arg == TRUE) { |
| 57 | + printf("-%c|--%s [value]: %s\n", options[i].optch, options[i].name, options[i].description); |
| 58 | + } else { |
| 59 | + printf("-%c|--%s: %s\n", options[i].optch, options[i].name, options[i].description); |
| 60 | + } |
| 61 | + } else { |
| 62 | + if (options[i].has_arg == TRUE) { |
| 63 | + printf(" --%s [value]: %s\n", options[i].name, options[i].description); |
| 64 | + } else { |
| 65 | + printf(" --%s: %s\n", options[i].name, options[i].description); |
| 66 | + } |
| 67 | + } |
| 68 | + i++; |
| 69 | + } |
| 70 | + exit(EXIT_FAILURE); |
| 71 | +} |
| 72 | + |
| 73 | +int main(int argc, const char * const *argv) { |
| 74 | + const char *db_path = NULL; |
| 75 | + const char *key_str = NULL; |
| 76 | + const char *out_filename = "output.bin"; |
| 77 | + int rc; |
| 78 | + MDB_env *env; |
| 79 | + MDB_txn *txn; |
| 80 | + MDB_dbi dbi; |
| 81 | + MDB_val key, data; |
| 82 | + apr_pool_t *pool = NULL; |
| 83 | + apr_getopt_t *opt; |
| 84 | + int optch; |
| 85 | + const char *optarg; |
| 86 | + |
| 87 | + apr_initialize(); |
| 88 | + apr_pool_create(&pool, NULL); |
| 89 | + apr_getopt_init(&opt, pool, argc, argv); |
| 90 | + |
| 91 | + while ((rc = apr_getopt_long(opt, options, &optch, &optarg)) == APR_SUCCESS) { |
| 92 | + switch (optch) { |
| 93 | + case 'h': |
| 94 | + usage(argv[0]); |
| 95 | + break; |
| 96 | + case 'd': |
| 97 | + db_path = optarg; |
| 98 | + break; |
| 99 | + case 'k': |
| 100 | + key_str = optarg; |
| 101 | + break; |
| 102 | + case 'o': |
| 103 | + out_filename = optarg; |
| 104 | + break; |
| 105 | + } |
| 106 | + } |
| 107 | + |
| 108 | + if (rc != APR_EOF) { |
| 109 | + fprintf(stderr, "Error: Invalid option.\n"); |
| 110 | + usage(argv[0]); |
| 111 | + } |
| 112 | + |
| 113 | + if (!db_path || !key_str) { |
| 114 | + fprintf(stderr, "Error: --dbpath and --key are required.\n"); |
| 115 | + usage(argv[0]); |
| 116 | + } |
| 117 | + |
| 118 | + // Create and open the environment |
| 119 | + rc = mdb_env_create(&env); |
| 120 | + if (rc) fail("mdb_env_create", rc); |
| 121 | + |
| 122 | + rc = mdb_env_open(env, db_path, MDB_RDONLY, 0664); |
| 123 | + if (rc) { |
| 124 | + mdb_env_close(env); |
| 125 | + fail("mdb_env_open", rc); |
| 126 | + } |
| 127 | + |
| 128 | + // Begin a read-only transaction |
| 129 | + rc = mdb_txn_begin(env, NULL, MDB_RDONLY, &txn); |
| 130 | + if (rc) { |
| 131 | + mdb_env_close(env); |
| 132 | + fail("mdb_txn_begin", rc); |
| 133 | + } |
| 134 | + |
| 135 | + // Open the database |
| 136 | + rc = mdb_dbi_open(txn, NULL, 0, &dbi); |
| 137 | + if (rc) { |
| 138 | + mdb_txn_abort(txn); |
| 139 | + mdb_env_close(env); |
| 140 | + fail("mdb_dbi_open", rc); |
| 141 | + } |
| 142 | + |
| 143 | + // Prepare the key, which is a null-terminated string in the DB |
| 144 | + key.mv_size = strlen(key_str) + 1; |
| 145 | + key.mv_data = (void *)key_str; |
| 146 | + |
| 147 | + // Retrieve the data |
| 148 | + rc = mdb_get(txn, dbi, &key, &data); |
| 149 | + |
| 150 | + if (rc == MDB_SUCCESS) { |
| 151 | + apr_time_t timestamp; |
| 152 | + char time_str[APR_RFC822_DATE_LEN]; |
| 153 | + FILE *fp; |
| 154 | + fp = fopen(out_filename, "wb"); |
| 155 | + if (!fp) { |
| 156 | + mdb_txn_abort(txn); |
| 157 | + mdb_env_close(env); |
| 158 | + perror("Unable to open output file"); |
| 159 | + return EXIT_FAILURE; |
| 160 | + } else { |
| 161 | + // Check for special blank tile encoding ('#' marker) |
| 162 | + if (data.mv_size > 1 && ((char *)data.mv_data)[0] == '#') { |
| 163 | + if (data.mv_size == 5 + sizeof(apr_time_t)) { |
| 164 | + const unsigned char *color = (unsigned char *)data.mv_data + 1; |
| 165 | + printf("Key found. Blank tile, color #%02x%02x%02x%02x. " |
| 166 | + "Writing description to \"%s\"\n", |
| 167 | + color[0], color[1], color[2], color[3], out_filename); |
| 168 | + fprintf(fp, "Blank tile, RGBA: #%02x%02x%02x%02x\n", |
| 169 | + color[0], color[1], color[2], color[3]); |
| 170 | + } else { |
| 171 | + printf("Key found. Blank tile marker found, but data " |
| 172 | + "size is unexpected (%zu bytes). Writing as is.\n", |
| 173 | + data.mv_size); |
| 174 | + fwrite(data.mv_data, 1, data.mv_size, fp); |
| 175 | + } |
| 176 | + |
| 177 | + // Extract timestamp from the end of the data |
| 178 | + memcpy(×tamp, (char *)data.mv_data + 5, sizeof(apr_time_t)); |
| 179 | + |
| 180 | + // Convert to human-readable format |
| 181 | + apr_rfc822_date(time_str, timestamp); |
| 182 | + |
| 183 | + printf("Timestamp: %s\n", time_str); |
| 184 | + } else if (data.mv_size >= sizeof(apr_time_t)) { |
| 185 | + // Regular tile data, strip the trailing timestamp |
| 186 | + size_t image_size = data.mv_size - sizeof(apr_time_t); |
| 187 | + |
| 188 | + // Extract timestamp from the end of the data |
| 189 | + memcpy(×tamp, (char *)data.mv_data + image_size, sizeof(apr_time_t)); |
| 190 | + |
| 191 | + // Convert to human-readable format |
| 192 | + apr_rfc822_date(time_str, timestamp); |
| 193 | + |
| 194 | + printf("Key found. Writing %zu image bytes to \"%s\"\n", |
| 195 | + image_size, out_filename); |
| 196 | + printf("Timestamp: %s\n", time_str); |
| 197 | + fwrite(data.mv_data, 1, image_size, fp); |
| 198 | + } else { |
| 199 | + // Data is smaller than a timestamp, write as is |
| 200 | + printf("Key found. Data size (%zu) is smaller than a " |
| 201 | + "timestamp, writing as is to \"%s\"\n", |
| 202 | + data.mv_size, out_filename); |
| 203 | + fwrite(data.mv_data, 1, data.mv_size, fp); |
| 204 | + } |
| 205 | + fclose(fp); |
| 206 | + } |
| 207 | + } else if (rc == MDB_NOTFOUND) { |
| 208 | + fprintf(stderr, "Key '%s' not found.\n", key_str); |
| 209 | + } else { |
| 210 | + fail("mdb_get", rc); |
| 211 | + } |
| 212 | + |
| 213 | + // Clean up |
| 214 | + mdb_txn_abort(txn); |
| 215 | + mdb_env_close(env); |
| 216 | + |
| 217 | + apr_pool_destroy(pool); |
| 218 | + apr_terminate(); |
| 219 | + |
| 220 | + return (rc == MDB_SUCCESS) ? EXIT_SUCCESS : EXIT_FAILURE; |
| 221 | +} |
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