Helper: create tar.gz with a single file */
| 66 | |
| 67 | /* Helper: create tar.gz with a single file */ |
| 68 | static unsigned char *create_test_targz(const char *filename, const unsigned char *content, |
| 69 | int content_len, int *out_len) { |
| 70 | /* Build tar data: 512-byte header + content padded to 512-byte boundary + 2x512 zero blocks */ |
| 71 | int data_blocks = (content_len + 511) / 512; |
| 72 | int tar_size = 512 + data_blocks * 512 + 1024; /* header + data + end-of-archive */ |
| 73 | unsigned char *tar = calloc(1, (size_t)tar_size); |
| 74 | if (!tar) |
| 75 | return NULL; |
| 76 | |
| 77 | /* Filename (bytes 0-99) */ |
| 78 | strncpy((char *)tar, filename, 99); |
| 79 | |
| 80 | /* Mode (bytes 100-107): octal 0700 */ |
| 81 | memcpy(tar + 100, "0000700\0", 8); |
| 82 | |
| 83 | /* UID/GID (bytes 108-123): 0 */ |
| 84 | memcpy(tar + 108, "0000000\0", 8); |
| 85 | memcpy(tar + 116, "0000000\0", 8); |
| 86 | |
| 87 | /* Size (bytes 124-135): octal */ |
| 88 | char size_str[12]; |
| 89 | snprintf(size_str, sizeof(size_str), "%011o", content_len); |
| 90 | memcpy(tar + 124, size_str, 11); |
| 91 | |
| 92 | /* Mtime (bytes 136-147): 0 */ |
| 93 | memcpy(tar + 136, "00000000000\0", 12); |
| 94 | |
| 95 | /* Type flag (byte 156): '0' = regular file */ |
| 96 | tar[156] = '0'; |
| 97 | |
| 98 | /* Checksum (bytes 148-155): compute over header with checksum field as spaces */ |
| 99 | memset(tar + 148, ' ', 8); |
| 100 | unsigned int checksum = 0; |
| 101 | for (int i = 0; i < 512; i++) |
| 102 | checksum += tar[i]; |
| 103 | snprintf((char *)tar + 148, 7, "%06o", checksum); |
| 104 | tar[154] = '\0'; |
| 105 | |
| 106 | /* File content */ |
| 107 | memcpy(tar + 512, content, (size_t)content_len); |
| 108 | |
| 109 | /* Compress with gzip */ |
| 110 | z_stream strm = {0}; |
| 111 | if (deflateInit2(&strm, Z_DEFAULT_COMPRESSION, Z_DEFLATED, 16 + MAX_WBITS, 8, |
| 112 | Z_DEFAULT_STRATEGY) != Z_OK) { |
| 113 | free(tar); |
| 114 | return NULL; |
| 115 | } |
| 116 | |
| 117 | size_t gz_cap = (size_t)tar_size + 256; |
| 118 | unsigned char *gz = malloc(gz_cap); |
| 119 | if (!gz) { |
| 120 | deflateEnd(&strm); |
| 121 | free(tar); |
| 122 | return NULL; |
| 123 | } |
| 124 | |
| 125 | strm.next_in = tar; |