+++ /dev/null
-/*
- * This file is part of the sigrok project.
- *
- * Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
- * Copyright (C) 2010-2012 Uwe Hermann <uwe@hermann-uwe.de>
- * Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-#include <string.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <unistd.h>
-#ifdef _WIN32
-#include <windows.h>
-#else
-#include <glob.h>
-#include <termios.h>
-#include <sys/ioctl.h>
-#endif
-#include <stdlib.h>
-#include <errno.h>
-#include <glib.h>
-#include "libsigrok.h"
-#include "libsigrok-internal.h"
-
-/* Message logging helpers with driver-specific prefix string. */
-#define DRIVER_LOG_DOMAIN "serial: "
-#define sr_log(l, s, args...) sr_log(l, DRIVER_LOG_DOMAIN s, ## args)
-#define sr_spew(s, args...) sr_spew(DRIVER_LOG_DOMAIN s, ## args)
-#define sr_dbg(s, args...) sr_dbg(DRIVER_LOG_DOMAIN s, ## args)
-#define sr_info(s, args...) sr_info(DRIVER_LOG_DOMAIN s, ## args)
-#define sr_warn(s, args...) sr_warn(DRIVER_LOG_DOMAIN s, ## args)
-#define sr_err(s, args...) sr_err(DRIVER_LOG_DOMAIN s, ## args)
-
-// FIXME: Must be moved, or rather passed as function argument.
-#ifdef _WIN32
-static HANDLE hdl;
-#endif
-
-/**
- * Open the specified serial port.
- *
- * @param serial Previously initialized serial port structure.
- * @param flags Flags to use when opening the serial port. Possible flags
- * include SERIAL_RDWR, SERIAL_RDONLY, SERIAL_NONBLOCK.
- *
- * If the serial structure contains a serialcomm string, it will be
- * passed to serial_set_paramstr() after the port is opened.
- *
- * @return SR_OK on success, SR_ERR on failure.
- */
-SR_PRIV int serial_open(struct sr_serial_dev_inst *serial, int flags)
-{
- int flags_local = 0;
-#ifdef _WIN32
- DWORD desired_access = 0, flags_and_attributes = 0;
-#endif
-
- if (!serial) {
- sr_dbg("Invalid serial port.");
- return SR_ERR;
- }
-
- sr_spew("Opening serial port '%s' (flags %d).", serial->port, flags);
-
-#ifdef _WIN32
- /* Map 'flags' to the OS-specific settings. */
- desired_access |= GENERIC_READ;
- flags_and_attributes = FILE_ATTRIBUTE_NORMAL;
- if (flags & SERIAL_RDWR)
- desired_access |= GENERIC_WRITE;
- if (flags & SERIAL_NONBLOCK)
- flags_and_attributes |= FILE_FLAG_OVERLAPPED;
-
- hdl = CreateFile(serial->port, desired_access, 0, 0,
- OPEN_EXISTING, flags_and_attributes, 0);
- if (hdl == INVALID_HANDLE_VALUE) {
- sr_err("Error opening serial port '%s'.", serial->port);
- return SR_ERR;
- }
-#else
- /* Map 'flags' to the OS-specific settings. */
- if (flags & SERIAL_RDWR)
- flags_local |= O_RDWR;
- if (flags & SERIAL_RDONLY)
- flags_local |= O_RDONLY;
- if (flags & SERIAL_NONBLOCK)
- flags_local |= O_NONBLOCK;
-
- if ((serial->fd = open(serial->port, flags_local)) < 0) {
- sr_err("Error opening serial port '%s': %s.", serial->port,
- strerror(errno));
- return SR_ERR;
- }
-
- sr_spew("Opened serial port '%s' (fd %d).", serial->port, serial->fd);
-#endif
-
- if (serial->serialcomm)
- return serial_set_paramstr(serial, serial->serialcomm);
- else
- return SR_OK;
-}
-
-/**
- * Close the specified serial port.
- *
- * @param serial Previously initialized serial port structure.
- *
- * @return SR_OK on success, SR_ERR on failure.
- */
-SR_PRIV int serial_close(struct sr_serial_dev_inst *serial)
-{
- int ret;
-
- if (!serial) {
- sr_dbg("Invalid serial port.");
- return SR_ERR;
- }
-
- if (serial->fd == -1) {
- sr_dbg("Cannot close unopened serial port %s (fd %d).",
- serial->port, serial->fd);
- return SR_ERR;
- }
-
- sr_spew("Closing serial port %s (fd %d).", serial->port, serial->fd);
- ret = SR_OK;
-
-#ifdef _WIN32
- /* Returns non-zero upon success, 0 upon failure. */
- if (CloseHandle(hdl) == 0)
- ret = SR_ERR;
-#else
- /* Returns 0 upon success, -1 upon failure. */
- if (close(serial->fd) < 0) {
- sr_err("Error closing serial port: %s (fd %d).", strerror(errno),
- serial->fd);
- ret = SR_ERR;
- }
-#endif
-
- serial->fd = -1;
-
- return ret;
-}
-
-/**
- * Flush serial port buffers.
- *
- * @param serial Previously initialized serial port structure.
- *
- * @return SR_OK on success, SR_ERR on failure.
- */
-SR_PRIV int serial_flush(struct sr_serial_dev_inst *serial)
-{
- int ret;
-
- if (!serial) {
- sr_dbg("Invalid serial port.");
- return SR_ERR;
- }
-
- if (serial->fd == -1) {
- sr_dbg("Cannot flush unopened serial port %s (fd %d).",
- serial->port, serial->fd);
- return SR_ERR;
- }
-
- sr_spew("Flushing serial port %s (fd %d).", serial->port, serial->fd);
- ret = SR_OK;
-
-#ifdef _WIN32
- /* Returns non-zero upon success, 0 upon failure. */
- if (PurgeComm(hdl, PURGE_RXCLEAR | PURGE_TXCLEAR) == 0) {
- sr_err("Error flushing serial port: %s.", strerror(errno));
- ret = SR_ERR;
- }
-#else
- /* Returns 0 upon success, -1 upon failure. */
- if (tcflush(serial->fd, TCIOFLUSH) < 0) {
- sr_err("Error flushing serial port: %s.", strerror(errno));
- ret = SR_ERR;
- }
-
- return ret;
-#endif
-}
-
-/**
- * Write a number of bytes to the specified serial port.
- *
- * @param serial Previously initialized serial port structure.
- * @param buf Buffer containing the bytes to write.
- * @param count Number of bytes to write.
- *
- * @return The number of bytes written, or -1 upon failure.
- */
-SR_PRIV int serial_write(struct sr_serial_dev_inst *serial,
- const void *buf, size_t count)
-{
- ssize_t ret;
-
- if (!serial) {
- sr_dbg("Invalid serial port.");
- return -1;
- }
-
- if (serial->fd == -1) {
- sr_dbg("Cannot use unopened serial port %s (fd %d).",
- serial->port, serial->fd);
- return -1;
- }
-
-#ifdef _WIN32
- DWORD tmp = 0;
-
- /* FIXME */
- /* Returns non-zero upon success, 0 upon failure. */
- WriteFile(hdl, buf, count, &tmp, NULL);
-#else
- /* Returns the number of bytes written, or -1 upon failure. */
- ret = write(serial->fd, buf, count);
- if (ret < 0)
- sr_err("Write error: %s.", strerror(errno));
- else
- sr_spew("Wrote %d/%d bytes (fd %d).", ret, count, serial->fd);
-#endif
-
- return ret;
-}
-
-/**
- * Read a number of bytes from the specified serial port.
- *
- * @param serial Previously initialized serial port structure.
- * @param buf Buffer where to store the bytes that are read.
- * @param count The number of bytes to read.
- *
- * @return The number of bytes read, or -1 upon failure.
- */
-SR_PRIV int serial_read(struct sr_serial_dev_inst *serial, void *buf,
- size_t count)
-{
- ssize_t ret;
-
- if (!serial) {
- sr_dbg("Invalid serial port.");
- return -1;
- }
-
- if (serial->fd == -1) {
- sr_dbg("Cannot use unopened serial port %s (fd %d).",
- serial->port, serial->fd);
- return -1;
- }
-
-#ifdef _WIN32
- DWORD tmp = 0;
-
- /* FIXME */
- /* Returns non-zero upon success, 0 upon failure. */
- return ReadFile(hdl, buf, count, &tmp, NULL);
-#else
- /* Returns the number of bytes read, or -1 upon failure. */
- ret = read(serial->fd, buf, count);
- if (ret < 0)
- /*
- * Should be sr_err(), but that would yield lots of
- * "Resource temporarily unavailable" messages.
- */
- sr_spew("Read error: %s (fd %d).", strerror(errno), serial->fd);
- else
- sr_spew("Read %d/%d bytes (fd %d).", ret, count, serial->fd);
-#endif
-
- return ret;
-}
-
-/**
- * Set serial parameters for the specified serial port.
- *
- * @param serial Previously initialized serial port structure.
- * @param baudrate The baudrate to set.
- * @param bits The number of data bits to use.
- * @param parity The parity setting to use (0 = none, 1 = even, 2 = odd).
- * @param stopbits The number of stop bits to use (1 or 2).
- * @param flowcontrol The flow control settings to use (0 = none, 1 = RTS/CTS,
- * 2 = XON/XOFF).
- *
- * @return SR_OK upon success, SR_ERR upon failure.
- */
-SR_PRIV int serial_set_params(struct sr_serial_dev_inst *serial, int baudrate,
- int bits, int parity, int stopbits,
- int flowcontrol, int rts, int dtr)
-{
- if (!serial) {
- sr_dbg("Invalid serial port.");
- return SR_ERR;
- }
-
- if (serial->fd == -1) {
- sr_dbg("Cannot configure unopened serial port %s (fd %d).",
- serial->port, serial->fd);
- return SR_ERR;
- }
-
- sr_spew("Setting serial parameters on port %s (fd %d).", serial->port,
- serial->fd);
-
-#ifdef _WIN32
- DCB dcb;
-
- if (!GetCommState(hdl, &dcb))
- return SR_ERR;
-
- switch (baudrate) {
- case 115200:
- dcb.BaudRate = CBR_115200;
- break;
- case 57600:
- dcb.BaudRate = CBR_57600;
- break;
- case 38400:
- dcb.BaudRate = CBR_38400;
- break;
- case 19200:
- dcb.BaudRate = CBR_19200;
- break;
- case 9600:
- dcb.BaudRate = CBR_9600;
- break;
- case 4800:
- dcb.BaudRate = CBR_4800;
- break;
- case 2400:
- dcb.BaudRate = CBR_2400;
- break;
- default:
- sr_err("Unsupported baudrate %d.", baudrate);
- return SR_ERR;
- }
- dcb.ByteSize = bits;
- dcb.Parity = NOPARITY; /* TODO: Don't hardcode. */
- dcb.StopBits = ONESTOPBIT; /* TODO: Don't hardcode. */
-
- if (rts != -1) {
- sr_spew("Setting RTS %s.", rts ? "high" : "low");
- if (rts)
- dcb.fRtsControl = RTS_CONTROL_ENABLE;
- else
- dcb.fRtsControl = RTS_CONTROL_DISABLE;
- }
-
- if (dtr != -1) {
- sr_spew("Setting DTR %s.", dtr ? "high" : "low");
- if (rts)
- dcb.fDtrControl = DTR_CONTROL_ENABLE;
- else
- dcb.fDtrControl = DTR_CONTROL_DISABLE;
- }
-
- if (!SetCommState(hdl, &dcb))
- return SR_ERR;
-#else
- struct termios term;
- speed_t baud;
- int ret, controlbits;
-
- if (tcgetattr(serial->fd, &term) < 0) {
- sr_err("tcgetattr() error on port %s (fd %d): %s.",
- serial->port, serial->fd, strerror(errno));
- return SR_ERR;
- }
-
- switch (baudrate) {
- case 50:
- baud = B50;
- break;
- case 75:
- baud = B75;
- break;
- case 110:
- baud = B110;
- break;
- case 134:
- baud = B134;
- break;
- case 150:
- baud = B150;
- break;
- case 200:
- baud = B200;
- break;
- case 300:
- baud = B300;
- break;
- case 600:
- baud = B600;
- break;
- case 1200:
- baud = B1200;
- break;
- case 1800:
- baud = B1800;
- break;
- case 2400:
- baud = B2400;
- break;
- case 4800:
- baud = B4800;
- break;
- case 9600:
- baud = B9600;
- break;
- case 19200:
- baud = B19200;
- break;
- case 38400:
- baud = B38400;
- break;
- case 57600:
- baud = B57600;
- break;
- case 115200:
- baud = B115200;
- break;
- case 230400:
- baud = B230400;
- break;
-#ifndef __APPLE__
- case 460800:
- baud = B460800;
- break;
-#endif
- default:
- sr_err("Unsupported baudrate %d.", baudrate);
- return SR_ERR;
- }
-
- sr_spew("Configuring output baudrate to %d (%d).", baudrate, baud);
- if (cfsetospeed(&term, baud) < 0) {
- sr_err("cfsetospeed() error: %s.", strerror(errno));
- return SR_ERR;
- }
-
- sr_spew("Configuring input baudrate to %d (%d).", baudrate, baud);
- if (cfsetispeed(&term, baud) < 0) {
- sr_err("cfsetispeed() error: %s.", strerror(errno));
- return SR_ERR;
- }
-
- sr_spew("Configuring %d data bits.", bits);
- term.c_cflag &= ~CSIZE;
- switch (bits) {
- case 8:
- term.c_cflag |= CS8;
- break;
- case 7:
- term.c_cflag |= CS7;
- break;
- default:
- sr_err("Unsupported data bits number %d.", bits);
- return SR_ERR;
- }
-
- sr_spew("Configuring %d stop bits.", stopbits);
- term.c_cflag &= ~CSTOPB;
- switch (stopbits) {
- case 1:
- term.c_cflag &= ~CSTOPB;
- break;
- case 2:
- term.c_cflag |= CSTOPB;
- break;
- default:
- sr_err("Unsupported stopbits number %d.", stopbits);
- return SR_ERR;
- }
-
- term.c_iflag &= ~(IXON | IXOFF);
- term.c_cflag &= ~CRTSCTS;
- switch (flowcontrol) {
- case 0:
- /* No flow control. */
- sr_spew("Configuring no flow control.");
- break;
- case 1:
- sr_spew("Configuring RTS/CTS flow control.");
- term.c_cflag |= CRTSCTS;
- break;
- case 2:
- sr_spew("Configuring XON/XOFF flow control.");
- term.c_iflag |= IXON | IXOFF;
- break;
- default:
- sr_err("Unsupported flow control setting %d.", flowcontrol);
- return SR_ERR;
- }
-
- term.c_iflag &= ~IGNPAR;
- term.c_cflag &= ~(PARODD | PARENB);
- switch (parity) {
- case SERIAL_PARITY_NONE:
- sr_spew("Configuring no parity.");
- term.c_iflag |= IGNPAR;
- break;
- case SERIAL_PARITY_EVEN:
- sr_spew("Configuring even parity.");
- term.c_cflag |= PARENB;
- break;
- case SERIAL_PARITY_ODD:
- sr_spew("Configuring odd parity.");
- term.c_cflag |= PARENB | PARODD;
- break;
- default:
- sr_err("Unsupported parity setting %d.", parity);
- return SR_ERR;
- }
-
- /* Do not translate carriage return to newline on input. */
- term.c_iflag &= ~(ICRNL);
-
- /* Disable canonical mode, and don't echo input characters. */
- term.c_lflag &= ~(ICANON | ECHO);
-
- /* Write the configured settings. */
- if (tcsetattr(serial->fd, TCSADRAIN, &term) < 0) {
- sr_err("tcsetattr() error: %s.", strerror(errno));
- return SR_ERR;
- }
-
- if (rts != -1) {
- sr_spew("Setting RTS %s.", rts ? "high" : "low");
- controlbits = TIOCM_RTS;
- if ((ret = ioctl(serial->fd, rts ? TIOCMBIS : TIOCMBIC,
- &controlbits)) < 0) {
- sr_err("Error setting RTS: %s.", strerror(errno));
- return SR_ERR;
- }
- }
-
- if (dtr != -1) {
- sr_spew("Setting DTR %s.", dtr ? "high" : "low");
- controlbits = TIOCM_DTR;
- if ((ret = ioctl(serial->fd, dtr ? TIOCMBIS : TIOCMBIC,
- &controlbits)) < 0) {
- sr_err("Error setting DTR: %s.", strerror(errno));
- return SR_ERR;
- }
- }
-
-#endif
-
- return SR_OK;
-}
-
-/**
- * Set serial parameters for the specified serial port.
- *
- * @param serial Previously initialized serial port structure.
- * @param paramstr A serial communication parameters string, in the form
- * of <speed>/<data bits><parity><stopbits>, for example "9600/8n1" or
- * "600/7o2".
- *
- * @return SR_OK upon success, SR_ERR upon failure.
- */
-#define SERIAL_COMM_SPEC "^(\\d+)/([78])([neo])([12])(.*)$"
-SR_PRIV int serial_set_paramstr(struct sr_serial_dev_inst *serial,
- const char *paramstr)
-{
- GRegex *reg;
- GMatchInfo *match;
- int speed, databits, parity, stopbits, rts, dtr, i;
- char *mstr, **opts, **kv;
-
- speed = databits = parity = stopbits = 0;
- rts = dtr = -1;
- reg = g_regex_new(SERIAL_COMM_SPEC, 0, 0, NULL);
- if (g_regex_match(reg, paramstr, 0, &match)) {
- if ((mstr = g_match_info_fetch(match, 1)))
- speed = strtoul(mstr, NULL, 10);
- g_free(mstr);
- if ((mstr = g_match_info_fetch(match, 2)))
- databits = strtoul(mstr, NULL, 10);
- g_free(mstr);
- if ((mstr = g_match_info_fetch(match, 3))) {
- switch (mstr[0]) {
- case 'n':
- parity = SERIAL_PARITY_NONE;
- break;
- case 'e':
- parity = SERIAL_PARITY_EVEN;
- break;
- case 'o':
- parity = SERIAL_PARITY_ODD;
- break;
- }
- }
- g_free(mstr);
- if ((mstr = g_match_info_fetch(match, 4)))
- stopbits = strtoul(mstr, NULL, 10);
- g_free(mstr);
- if ((mstr = g_match_info_fetch(match, 5)) && mstr[0] != '\0') {
- if (mstr[0] != '/') {
- sr_dbg("missing separator before extra options");
- speed = 0;
- } else {
- /* A set of "key=value" options separated by / */
- opts = g_strsplit(mstr + 1, "/", 0);
- for (i = 0; opts[i]; i++) {
- kv = g_strsplit(opts[i], "=", 2);
- if (!strncmp(kv[0], "rts", 3)) {
- if (kv[1][0] == '1')
- rts = 1;
- else if (kv[1][0] == '0')
- rts = 0;
- else {
- sr_dbg("invalid value for rts: %c", kv[1][0]);
- speed = 0;
- }
- } else if (!strncmp(kv[0], "dtr", 3)) {
- if (kv[1][0] == '1')
- dtr = 1;
- else if (kv[1][0] == '0')
- dtr = 0;
- else {
- sr_dbg("invalid value for dtr: %c", kv[1][0]);
- speed = 0;
- }
- }
- g_strfreev(kv);
- }
- g_strfreev(opts);
- }
- }
- g_free(mstr);
- }
- g_match_info_unref(match);
- g_regex_unref(reg);
-
- if (speed)
- return serial_set_params(serial, speed, databits, parity, stopbits,
- 0, rts, dtr);
- else
- return SR_ERR_ARG;
-}
-
-/**
- * Read a line from the specified serial port.
- *
- * @param serial Previously initialized serial port structure.
- * @param buf Buffer where to store the bytes that are read.
- * @param buflen Size of the buffer.
- * @param timeout_ms How long to wait for a line to come in.
- *
- * Reading stops when CR of LR is found, which is stripped from the buffer.
- *
- * @return SR_OK on success, SR_ERR on failure.
- */
-SR_PRIV int serial_readline(struct sr_serial_dev_inst *serial, char **buf,
- int *buflen, gint64 timeout_ms)
-{
- gint64 start;
- int maxlen, len;
-
- if (!serial || serial->fd == -1) {
- sr_dbg("Invalid serial port.");
- return SR_ERR;
- }
-
- if (serial->fd == -1) {
- sr_dbg("Cannot use unopened serial port %s (fd %d).",
- serial->port, serial->fd);
- return -1;
- }
-
- timeout_ms *= 1000;
- start = g_get_monotonic_time();
-
- maxlen = *buflen;
- *buflen = len = 0;
- while(1) {
- len = maxlen - *buflen - 1;
- if (len < 1)
- break;
- len = serial_read(serial, *buf + *buflen, 1);
- if (len > 0) {
- *buflen += len;
- *(*buf + *buflen) = '\0';
- if (*buflen > 0 && (*(*buf + *buflen - 1) == '\r'
- || *(*buf + *buflen - 1) == '\n')) {
- /* Strip CR/LF and terminate. */
- *(*buf + --*buflen) = '\0';
- break;
- }
- }
- if (g_get_monotonic_time() - start > timeout_ms)
- /* Timeout */
- break;
- g_usleep(2000);
- }
- if (*buflen)
- sr_dbg("Received %d: '%s'.", *buflen, *buf);
-
- return SR_OK;
-}
-
-/**
- * Try to find a valid packet in a serial data stream.
- *
- * @param serial Previously initialized serial port structure.
- * @param buf Buffer containing the bytes to write.
- * @param count Size of the buffer.
- * @param packet_size Size, in bytes, of a valid packet.
- * @param is_valid Callback that assesses whether the packet is valid or not.
- * @param timeout_ms The timeout after which, if no packet is detected, to
- * abort scanning.
- * @param baudrate The baudrate of the serial port. This parameter is not
- * critical, but it helps fine tune the serial port polling
- * delay.
- *
- * @return SR_OK if a valid packet is found within the given timeout,
- * SR_ERR upon failure.
- */
-SR_PRIV int serial_stream_detect(struct sr_serial_dev_inst *serial,
- uint8_t *buf, size_t *buflen,
- size_t packet_size, packet_valid_t is_valid,
- uint64_t timeout_ms, int baudrate)
-{
- uint64_t start, time, byte_delay_us;
- size_t ibuf, i, maxlen;
- int len;
-
- maxlen = *buflen;
-
- sr_dbg("Detecting packets on FD %d (timeout = %" PRIu64
- "ms, baudrate = %d).", serial->fd, timeout_ms, baudrate);
-
- if (maxlen < (packet_size / 2) ) {
- sr_err("Buffer size must be at least twice the packet size.");
- return SR_ERR;
- }
-
- /* Assume 8n1 transmission. That is 10 bits for every byte. */
- byte_delay_us = 10 * (1000000 / baudrate);
- start = g_get_monotonic_time();
-
- i = ibuf = len = 0;
- while (ibuf < maxlen) {
- len = serial_read(serial, &buf[ibuf], 1);
- if (len > 0) {
- ibuf += len;
- } else if (len == 0) {
- sr_spew("Error: Only read 0 bytes.");
- } else {
- /* Error reading byte, but continuing anyway. */
- }
-
- time = g_get_monotonic_time() - start;
- time /= 1000;
-
- if ((ibuf - i) >= packet_size) {
- /* We have at least a packet's worth of data. */
- if (is_valid(&buf[i])) {
- sr_spew("Found valid %d-byte packet after "
- "%" PRIu64 "ms.", (ibuf - i), time);
- *buflen = ibuf;
- return SR_OK;
- } else {
- sr_spew("Got %d bytes, but not a valid "
- "packet.", (ibuf - i));
- }
- /* Not a valid packet. Continue searching. */
- i++;
- }
- if (time >= timeout_ms) {
- /* Timeout */
- sr_dbg("Detection timed out after %dms.", time);
- break;
- }
- g_usleep(byte_delay_us);
- }
-
- *buflen = ibuf;
-
- sr_err("Didn't find a valid packet (read %d bytes).", *buflen);
-
- return SR_ERR;
-}
projects / libsigrok.git / blobdiff