+inline STATUS http_verify_gzencode_buffer(const char *data, size_t data_len, const char **encoded, size_t *encoded_len, int error_level TSRMLS_DC)
+{
+ size_t offset = sizeof(http_encoding_gzip_header);
+
+ if (data_len < offset) {
+ goto really_bad_gzip_header;
+ }
+
+ if (data[0] != (const char) 0x1F || data[1] != (const char) 0x8B) {
+ http_error_ex(error_level TSRMLS_CC, HTTP_E_ENCODING, "Unrecognized GZIP header start: 0x%02X 0x%02X", (int) data[0], (int) (data[1] & 0xFF));
+ return FAILURE;
+ }
+
+ if (data[2] != (const char) Z_DEFLATED) {
+ http_error_ex(error_level TSRMLS_CC, HTTP_E_ENCODING, "Unrecognized compression format (%d)", (int) (data[2] & 0xFF));
+ /* still try to decode */
+ }
+ if ((data[3] & 0x4) == 0x4) {
+ if (data_len < offset + 2) {
+ goto really_bad_gzip_header;
+ }
+ /* there are extra fields, the length follows the common header as 2 bytes LSB */
+ offset += (unsigned) ((data[offset] & 0xFF));
+ offset += 1;
+ offset += (unsigned) ((data[offset] & 0xFF) << 8);
+ offset += 1;
+ }
+ if ((data[3] & 0x8) == 0x8) {
+ if (data_len <= offset) {
+ goto really_bad_gzip_header;
+ }
+ /* there's a file name */
+ offset += strlen(&data[offset]) + 1 /*NUL*/;
+ }
+ if ((data[3] & 0x10) == 0x10) {
+ if (data_len <= offset) {
+ goto really_bad_gzip_header;
+ }
+ /* there's a comment */
+ offset += strlen(&data[offset]) + 1 /* NUL */;
+ }
+ if ((data[3] & 0x2) == 0x2) {
+ /* there's a CRC16 of the header */
+ offset += 2;
+ if (data_len <= offset) {
+ goto really_bad_gzip_header;
+ } else {
+ unsigned long crc, cmp;
+
+ cmp = (unsigned) ((data[offset-2] & 0xFF));
+ cmp += (unsigned) ((data[offset-1] & 0xFF) << 8);
+
+ crc = crc32(0L, Z_NULL, 0);
+ crc = crc32(crc, data, sizeof(http_encoding_gzip_header));
+
+ if (cmp != (crc & 0xFFFF)) {
+ http_error_ex(error_level TSRMLS_CC, HTTP_E_ENCODING, "GZIP headers CRC checksums so not match (%lu, %lu)", cmp, crc & 0xFFFF);
+ return FAILURE;
+ }
+ }
+ }
+
+ if (data_len < offset + 8) {
+ http_error(error_level TSRMLS_CC, HTTP_E_ENCODING, "Missing or truncated GZIP footer");
+ return FAILURE;
+ }
+
+ if (encoded) {
+ *encoded = data + offset;
+ }
+ if (encoded_len) {
+ *encoded_len = data_len - offset - 8 /* size of the assumed GZIP footer */;
+ }
+
+ return SUCCESS;
+
+really_bad_gzip_header:
+ http_error(error_level TSRMLS_CC, HTTP_E_ENCODING, "Missing or truncated GZIP header");
+ return FAILURE;
+}
+
+inline STATUS http_verify_gzdecode_buffer(const char *data, size_t data_len, const char *decoded, size_t decoded_len, int error_level TSRMLS_DC)
+{
+ STATUS status = SUCCESS;
+ unsigned long len, cmp, crc;
+
+ crc = crc32(0L, Z_NULL, 0);
+ crc = crc32(crc, (const Bytef *) decoded, decoded_len);
+
+ cmp = (unsigned) ((data[data_len-8] & 0xFF));
+ cmp += (unsigned) ((data[data_len-7] & 0xFF) << 8);
+ cmp += (unsigned) ((data[data_len-6] & 0xFF) << 16);
+ cmp += (unsigned) ((data[data_len-5] & 0xFF) << 24);
+ len = (unsigned) ((data[data_len-4] & 0xFF));
+ len += (unsigned) ((data[data_len-3] & 0xFF) << 8);
+ len += (unsigned) ((data[data_len-2] & 0xFF) << 16);
+ len += (unsigned) ((data[data_len-1] & 0xFF) << 24);
+
+ if (cmp != crc) {
+ http_error_ex(error_level TSRMLS_CC, HTTP_E_ENCODING, "Could not verify data integrity: CRC checksums do not match (%lu, %lu)", cmp, crc);
+ status = FAILURE;
+ }
+ if (len != decoded_len) {
+ http_error_ex(error_level TSRMLS_CC, HTTP_E_ENCODING, "Could not verify data integrity: data sizes do not match (%lu, %lu)", len, decoded_len);
+ status = FAILURE;
+ }
+ return status;
+}
+
+PHP_HTTP_API STATUS _http_encode(http_encoding_type type, int level, const char *data, size_t data_len, char **encoded, size_t *encoded_len TSRMLS_DC)
+{
+ STATUS status = SUCCESS;
+
+ switch (type)
+ {
+ case HTTP_ENCODING_ANY:
+ case HTTP_ENCODING_GZIP:
+ status = http_encoding_gzencode(level, data, data_len, encoded, encoded_len);
+ break;
+
+ case HTTP_ENCODING_DEFLATE:
+ status = http_encoding_deflate(level, data, data_len, encoded, encoded_len);
+ break;
+
+ case HTTP_ENCODING_COMPRESS:
+ status = http_encoding_compress(level, data, data_len, encoded, encoded_len);
+ break;
+
+ case HTTP_ENCODING_NONE:
+ default:
+ *encoded = estrndup(data, data_len);
+ *encoded_len = data_len;
+ break;
+ }
+
+ return status;
+}
+
+PHP_HTTP_API STATUS _http_decode(http_encoding_type type, const char *data, size_t data_len, char **decoded, size_t *decoded_len TSRMLS_DC)
+{
+ STATUS status = SUCCESS;
+
+ switch (type)
+ {
+ case HTTP_ENCODING_ANY:
+ if ( SUCCESS != http_encoding_gzdecode(data, data_len, decoded, decoded_len) &&
+ SUCCESS != http_encoding_inflate(data, data_len, decoded, decoded_len) &&
+ SUCCESS != http_encoding_uncompress(data, data_len, decoded, decoded_len)) {
+ status = FAILURE;
+ }
+ break;
+
+ case HTTP_ENCODING_GZIP:
+ status = http_encoding_gzdecode(data, data_len, decoded, decoded_len);
+ break;
+
+ case HTTP_ENCODING_DEFLATE:
+ status = http_encoding_inflate(data, data_len, decoded, decoded_len);
+ break;
+
+ case HTTP_ENCODING_COMPRESS:
+ status = http_encoding_uncompress(data, data_len, decoded, decoded_len);
+ break;
+
+ case HTTP_ENCODING_NONE:
+ default:
+ *decoded = estrndup(data, data_len);
+ *decoded_len = data_len;
+ break;
+ }
+
+ return status;
+}