90 lines
2.5 KiB
C
90 lines
2.5 KiB
C
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#define _POSIX_C_SOURCE 200809L
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdnoreturn.h>
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#include <stdarg.h>
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#include <string.h>
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#include "minitar.h"
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#include "tar.h"
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noreturn void minitar_panic(const char* message)
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{
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fprintf(stderr, "minitar: %s\n", message);
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abort();
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}
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void minitar_parse_tar_header(struct tar_header* hdr, struct minitar_entry_metadata* metadata)
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{
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if(!strlen(hdr->prefix))
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{
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strncpy(metadata->name, hdr->name, 100);
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metadata->name[100] = '\0';
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} else {
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strcpy(metadata->name, hdr->prefix);
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strcat(metadata->name, "/");
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strncat(metadata->name, hdr->name, 100);
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metadata->name[256] = '\0';
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}
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metadata->mode = (mode_t)strtol(hdr->mode, NULL, 8);
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metadata->uid = (uid_t)strtoul(hdr->uid, NULL, 8);
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metadata->gid = (gid_t)strtoul(hdr->gid, NULL, 8);
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char* sizeptr = strndup(hdr->size, 12);
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if(!sizeptr) minitar_panic("Failed to allocate memory to duplicate a tar header's size field");
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metadata->size = (size_t)strtoull(sizeptr, NULL, 8);
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free(sizeptr);
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char* timeptr = strndup(hdr->mtime, 12);
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if(!timeptr) minitar_panic("Failed to allocate memory to duplicate a tar header's mtime field");
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metadata->mtime = (time_t)strtol(timeptr, NULL, 8);
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free(timeptr);
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switch(hdr->typeflag)
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{
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case '\0':
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case '0':
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metadata->type = MTAR_REGULAR;
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break;
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case '1':
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minitar_panic("Links to other files within a tar archive are unsupported");
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case '2':
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minitar_panic("Symbolic links are unsupported");
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case '3':
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metadata->type = MTAR_CHRDEV;
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break;
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case '4':
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metadata->type = MTAR_BLKDEV;
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break;
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case '5':
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metadata->type = MTAR_DIRECTORY;
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break;
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case '6':
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minitar_panic("FIFOs are unsupported");
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default:
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minitar_panic("Unknown entry type in tar header");
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}
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strcpy(metadata->uname, hdr->uname);
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strcpy(metadata->gname, hdr->gname);
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}
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int minitar_validate_header(struct tar_header* hdr)
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{
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return !strncmp(hdr->magic, "ustar", 5);
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}
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int minitar_read_header(struct minitar* mp, struct tar_header* hdr)
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{
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size_t rc = fread(hdr, sizeof *hdr, 1, mp->stream);
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if(rc == 0 && feof(mp->stream)) return 0;
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return 1;
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}
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struct minitar_entry* minitar_dup_entry(struct minitar_entry* original)
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{
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struct minitar_entry* new = malloc(sizeof *original);
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if(!new) return NULL;
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memcpy(new, original, sizeof *new);
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return new;
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}
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