A lightweight tar library written in ANSI C
The library consists of microtar.c and microtar.h. These two files can be dropped into an existing project and compiled along with it.
mtar_t tar;
mtar_header_t h;
char *p;
/* Open archive for reading */
mtar_open(&tar, "test.tar", "r");
/* Print all file names and sizes */
while ( (mtar_read_header(&tar, &h)) != MTAR_ENULLRECORD ) {
printf("%s (%d bytes)\n", h.name, h.size);
mtar_next(&tar);
}
/* Load and print contents of file "test.txt" */
mtar_find(&tar, "test.txt", &h);
p = calloc(1, h.size + 1);
mtar_read_data(&tar, p, h.size);
printf("%s", p);
free(p);
/* Close archive */
mtar_close(&tar);
mtar_t tar; const char *str1 = "Hello world"; const char *str2 = "Goodbye world"; /* Open archive for writing */ mtar_open(&tar, "test.tar", "w"); /* Write strings to files `test1.txt` and `test2.txt` */ mtar_write_file_header(&tar, "test1.txt", strlen(str1)); mtar_write_data(&tar, str1, strlen(str1)); mtar_write_file_header(&tar, "test2.txt", strlen(str2)); mtar_write_data(&tar, str2, strlen(str2)); /* Finalize -- this needs to be the last thing done before closing */ mtar_finalize(&tar); /* Close archive */ mtar_close(&tar);
All functions which return an int will return MTAR_ESUCCESS if the operation is successful. If an error occurs an error value less-than-zero will be returned; this value can be passed to the function mtar_strerror() to get its corresponding error string.
If you want to read or write from something other than a file, the mtar_t struct can be manually initialized with your own callback functions and a stream pointer.
All callback functions are passed a pointer to the mtar_t struct as their first argument. They should return MTAR_ESUCCESS if the operation succeeds without an error, or an integer below zero if an error occurs.
After the stream field has been set, all required callbacks have been set and all unused fields have been zeroset the mtar_t struct can be safely used with the microtar functions. mtar_open should not be called if the mtar_t struct was initialized manually.
The following callbacks should be set for reading an archive from a stream:
Name Arguments Descriptionread mtar_t *tar, void *data, unsigned size Read data from the stream seek mtar_t *tar, unsigned pos Set the position indicator close mtar_t *tar Close the stream
The following callbacks should be set for writing an archive to a stream:
Name Arguments Descriptionwrite mtar_t *tar, const void *data, unsigned size Write data to the stream
This library is free software; you can redistribute it and/or modify it under the terms of the MIT license. See LICENSE for details.
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