114 lines
3.6 KiB
C
114 lines
3.6 KiB
C
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// Copyright (c) Cesanta Software Limited
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// All rights reserved.
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// This program is used to pack arbitrary data into a C binary. It takes
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// a list of files as an input, and produces a .c data file that contains
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// contents of all these files as a collection of byte arrays.
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//
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// Usage:
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// 1. Compile this file:
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// cc -o pack pack.c
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//
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// 2. Convert list of files into single .c:
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// ./pack file1.data file2.data > fs.c
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//
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// 3. In your application code, you can access files using this function:
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// const char *mg_unpack(const char *file_name, size_t *size);
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//
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// 4. Build your app with fs.c:
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// cc -o my_app my_app.c fs.c
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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static const char *code =
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"static int scmp(const char *a, const char *b) {\n"
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" while (*a && (*a == *b)) a++, b++;\n"
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" return *(const unsigned char *) a - *(const unsigned char *) b;\n"
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"}\n"
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"const char *mg_unlist(size_t no);\n"
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"const char *mg_unlist(size_t no) {\n"
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" return packed_files[no].name;\n"
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"}\n"
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"const char *mg_unpack(const char *path, size_t *size, time_t *mtime);\n"
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"const char *mg_unpack(const char *name, size_t *size, time_t *mtime) {\n"
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" const struct packed_file *p;\n"
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" for (p = packed_files; p->name != NULL; p++) {\n"
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" if (scmp(p->name, name) != 0) continue;\n"
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" if (size != NULL) *size = p->size - 1;\n"
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" if (mtime != NULL) *mtime = p->mtime;\n"
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" return (const char *) p->data;\n"
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" }\n"
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" return NULL;\n"
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"}\n";
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int main(int argc, char *argv[]) {
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int i, j, ch;
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const char *strip_prefix = "";
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printf("%s", "#include <stddef.h>\n");
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printf("%s", "#include <string.h>\n");
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printf("%s", "#include <time.h>\n");
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printf("%s", "\n");
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for (i = 1; i < argc; i++) {
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if (strcmp(argv[i], "-s") == 0) {
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strip_prefix = argv[++i];
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} else if (strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "--help") == 0) {
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fprintf(stderr, "Usage: %s[-s STRIP_PREFIX] files...\n", argv[0]);
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exit(EXIT_FAILURE);
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} else {
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char ascii[12];
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FILE *fp = fopen(argv[i], "rb");
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if (fp == NULL) {
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fprintf(stderr, "Cannot open [%s]: %s\n", argv[i], strerror(errno));
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exit(EXIT_FAILURE);
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}
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printf("static const unsigned char v%d[] = {\n", i);
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for (j = 0; (ch = fgetc(fp)) != EOF; j++) {
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if (j == (int) sizeof(ascii)) {
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printf(" // %.*s\n", j, ascii);
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j = 0;
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}
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ascii[j] = (char) ((ch >= ' ' && ch <= '~' && ch != '\\') ? ch : '.');
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printf(" %3u,", ch);
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}
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// Append zero byte at the end, to make text files appear in memory
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// as nul-terminated strings.
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// printf(" 0 // %.*s\n", (int) sizeof(ascii), ascii);
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printf(" 0 // %.*s\n};\n", j, ascii);
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fclose(fp);
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}
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}
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printf("%s", "\nstatic const struct packed_file {\n");
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printf("%s", " const char *name;\n");
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printf("%s", " const unsigned char *data;\n");
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printf("%s", " size_t size;\n");
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printf("%s", " time_t mtime;\n");
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printf("%s", "} packed_files[] = {\n");
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for (i = 1; i < argc; i++) {
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struct stat st;
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const char *name = argv[i];
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size_t n = strlen(strip_prefix);
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if (strcmp(argv[i], "-s") == 0) {
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i++;
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continue;
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}
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stat(argv[i], &st);
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if (strncmp(name, strip_prefix, n) == 0) name += n;
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printf(" {\"/%s\", v%d, sizeof(v%d), %lu},\n", name, i, i,
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(unsigned long) st.st_mtime);
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}
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printf("%s", " {NULL, NULL, 0, 0}\n");
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printf("%s", "};\n\n");
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printf("%s", code);
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return EXIT_SUCCESS;
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}
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