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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,174 @@ | ||
| /* | ||
| * Written by Tim Kientzle, March 2009. | ||
| * | ||
| * Released into the public domain. | ||
| */ | ||
|
|
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| #include <stdio.h> | ||
|
|
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| static int parseoct(const char *p, size_t n){ | ||
| int i = 0; | ||
|
|
||
| while (*p < '0' || *p > '7') { | ||
| ++p; | ||
| --n; | ||
| } | ||
| while (*p >= '0' && *p <= '7' && n > 0) { | ||
| i *= 8; | ||
| i += *p - '0'; | ||
| ++p; | ||
| --n; | ||
| } | ||
| return (i); | ||
| } | ||
|
|
||
| /* Returns true if this is 512 zero bytes. */ | ||
| static int is_end_of_archive(const char *p){ | ||
| int n; | ||
| for (n = 511; n >= 0; --n) | ||
| if (p[n] != '\0') | ||
| return (0); | ||
| return (1); | ||
| } | ||
|
|
||
| /* Create a directory, including parent directories as necessary. */ | ||
| static void create_dir(char *pathname, int mode){ | ||
| char *p; | ||
| int r; | ||
|
|
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| /* Strip trailing '/' */ | ||
| if (pathname[strlen(pathname) - 1] == '/') | ||
| pathname[strlen(pathname) - 1] = '\0'; | ||
|
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| /* Try creating the directory. */ | ||
| r = mkdir(pathname, mode); | ||
|
|
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| if (r != 0) { | ||
| /* On failure, try creating parent directory. */ | ||
| p = strrchr(pathname, '/'); | ||
| if (p != NULL) { | ||
| *p = '\0'; | ||
| create_dir(pathname, 0755); | ||
| *p = '/'; | ||
| r = mkdir(pathname, mode); | ||
| } | ||
| } | ||
| if (r != 0) | ||
| fprintf(stderr, "Could not create directory %s\n", pathname); | ||
| } | ||
|
|
||
| /* Create a file, including parent directory as necessary. */ | ||
| static FILE* create_file(char *pathname, int mode){ | ||
| FILE *f; | ||
| f = fopen(pathname, "w+"); | ||
| if (f == NULL) { | ||
| /* Try creating parent dir and then creating file. */ | ||
| char *p = strrchr(pathname, '/'); | ||
| if (p != NULL) { | ||
| *p = '\0'; | ||
| create_dir(pathname, 0755); | ||
| *p = '/'; | ||
| f = fopen(pathname, "w+"); | ||
| } | ||
| } | ||
| return (f); | ||
| } | ||
|
|
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| /* Verify the tar checksum. */ | ||
| static int verify_checksum(const char *p){ | ||
| int n, u = 0; | ||
| for (n = 0; n < 512; ++n) { | ||
| if (n < 148 || n > 155) | ||
| /* Standard tar checksum adds unsigned bytes. */ | ||
| u += ((unsigned char *)p)[n]; | ||
| else | ||
| u += 0x20; | ||
|
|
||
| } | ||
| return (u == parseoct(p + 148, 8)); | ||
| } | ||
|
|
||
| /* Extract a tar archive. */ | ||
| int untar(const char* tar_path, const char* dst_path){ | ||
| char buffer[512]; | ||
| FILE* file_tmp = NULL; | ||
| FILE* tar_file = fopen(tar_path, "r");; | ||
| size_t bytes_read; | ||
| int file_size; | ||
| int dst_path_len = strlen(dst_path); | ||
|
|
||
| printf("Extracting from %s\n", tar_path); | ||
| for (;;) { | ||
| bytes_read = fread(buffer, 1, 512, tar_file); | ||
| if (bytes_read < 512) { | ||
| fprintf(stderr, "Short read on %s: expected 512, got %d\n", tar_path, bytes_read); | ||
| return -1; | ||
| } | ||
| if (is_end_of_archive(buffer)) { | ||
| printf("End of %s\n", tar_path); | ||
| return -1; | ||
| } | ||
| if (!verify_checksum(buffer)) { | ||
| fprintf(stderr, "Checksum failure\n"); | ||
| return -1; | ||
| } | ||
| file_size = parseoct(buffer + 124, 12); | ||
| switch (buffer[156]) { | ||
| case '1': | ||
| printf(" Ignoring hardlink %s\n", buffer); | ||
| break; | ||
| case '2': | ||
| printf(" Ignoring symlink %s\n", buffer); | ||
| break; | ||
| case '3': | ||
| printf(" Ignoring character device %s\n", buffer); | ||
| break; | ||
| case '4': | ||
| printf(" Ignoring block device %s\n", buffer); | ||
| break; | ||
| case '5': | ||
| char* path_dir = malloc(dst_path_len + strlen(buffer) + 1); | ||
| strcpy(path_dir, dst_path); | ||
| strcat(path_dir, buffer); | ||
| printf(" Extracting dir %s to %s\n", buffer, path_dir); | ||
| create_dir(path_dir, parseoct(buffer + 100, 8)); | ||
| file_size = 0; | ||
| break; | ||
| case '6': | ||
| printf(" Ignoring FIFO %s\n", buffer); | ||
| break; | ||
| default: | ||
| char* path_file = malloc(dst_path_len + strlen(buffer) + 1); | ||
| strcpy(path_file, dst_path); | ||
| strcat(path_file, buffer); | ||
| printf(" Extracting file %s to %s\n", buffer, path_file); | ||
| file_tmp = create_file(path_file, parseoct(buffer + 100, 8)); | ||
| break; | ||
| } | ||
| while (file_size > 0) { | ||
| bytes_read = fread(buffer, 1, 512, tar_file); | ||
| if (bytes_read < 512) { | ||
| fprintf(stderr, "Short read on %s: Expected 512, got %d\n", dst_path, bytes_read); | ||
| return -1; | ||
| } | ||
| if (file_size < 512) | ||
| bytes_read = file_size; | ||
| if(file_tmp != NULL){ | ||
| if (fwrite(buffer, 1, bytes_read, file_tmp) != bytes_read){ | ||
| fprintf(stderr, "Failed write\n"); | ||
| fclose(file_tmp); | ||
| file_tmp = NULL; | ||
| } | ||
| } | ||
| file_size -= bytes_read; | ||
| } | ||
| if(file_tmp != NULL){ | ||
| fclose(file_tmp); | ||
| file_tmp = NULL; | ||
| } | ||
| } | ||
|
|
||
| fclose(tar_file); | ||
|
|
||
| return 0; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,8 @@ | ||
| #ifndef UNTAR_H | ||
| #define UNTAR_H | ||
|
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| #include <stddef.h> | ||
|
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| int untar(const char* tar_path, const char* dst_path); | ||
|
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| #endif // UNTAR_H |