From 6dd486d5f3ac642bc348fdcd89c33b86e8158637 Mon Sep 17 00:00:00 2001
From: XANTRONIX Development <dev@xantronix.com>
Date: Sat, 4 Jun 2016 20:33:10 -0500
Subject: [PATCH] Implement stuff to print like, a thing

---
 include/tabby/printer.h | 49 +++++++++++++++++++++++
 src/printer.c           | 89 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 138 insertions(+)

diff --git a/include/tabby/printer.h b/include/tabby/printer.h
index 12243a2..c108bec 100644
--- a/include/tabby/printer.h
+++ b/include/tabby/printer.h
@@ -3,6 +3,12 @@
 
 #define TABBY_PRINTER_MAX_PACKET_SIZE 640
 
+#define TABBY_PRINTER_BAND_SIZE  640
+#define TABBY_PRINTER_SHEET_BANDS  9
+
+#define TABBY_PRINTER_SHEET_SIZE \
+    (TABBY_PRINTER_SHEET_BANDS * TABBY_PRINTER_BAND_SIZE)
+
 typedef enum {
     TABBY_PRINTER_LOWBAT = (1 << 7),
     TABBY_PRINTER_ER2    = (1 << 6),
@@ -14,6 +20,19 @@ typedef enum {
     TABBY_PRINTER_SUM    = (1 << 0)
 } tabby_printer_status;
 
+typedef enum {
+    TABBY_PRINTER_PACKET_INIT    = 0x01,
+    TABBY_PRINTER_PACKET_JOB     = 0x02,
+    TABBY_PRINTER_PACKET_DATA    = 0x04,
+    TABBY_PRINTER_PACKET_CANCEL  = 0x08,
+    TABBY_PRINTER_PACKET_INQUIRY = 0x0f
+} tabby_printer_packet_type;
+
+typedef enum {
+    TABBY_PRINTER_COMPRESSION_NONE = 0x00,
+    TABBY_PRINTER_COMPRESSION_RLE  = 0x01
+} tabby_printer_compression;
+
 /*
  * Data definitions for packets sent from Game Boy to printer
  */
@@ -31,6 +50,15 @@ typedef struct _tabby_printer_packet {
     };
 } tabby_printer_packet;
 
+typedef struct _tabby_printer_job_packet {
+    tabby_printer_packet header;
+
+    uint8_t sheets,
+            linefeeds,
+            palette,
+            density;
+} tabby_printer_job_packet;
+
 typedef struct _tabby_printer_response {
     uint8_t device;
     uint8_t status;
@@ -53,4 +81,25 @@ int tabby_printer_packet_send(int fd,
                               void *body,
                               tabby_printer_response *response);
 
+int tabby_printer_init(int fd,
+                       tabby_printer_response *response);
+
+int tabby_printer_send_inquiry(int fd,
+                               tabby_printer_response *response);
+
+int tabby_printer_job_start(int fd, uint8_t sheets,
+                                    uint8_t linefeeds,
+                                    uint8_t palette,
+                                    uint8_t density,
+                                    tabby_printer_response *response);
+
+int tabby_printer_job_finish(int fd,
+                             tabby_printer_response *response);
+
+int tabby_printer_job_cancel(int fd,
+                             tabby_printer_response *response);
+
+int tabby_printer_send_sheet(int fd, void *data,
+                                     tabby_printer_response *response);
+
 #endif /* _TABBY_PRINTER_H */
diff --git a/src/printer.c b/src/printer.c
index 550eb93..9395288 100644
--- a/src/printer.c
+++ b/src/printer.c
@@ -136,3 +136,92 @@ int tabby_printer_packet_send(int fd,
 error_io:
     return -1;
 }
+
+static void init_header(tabby_printer_packet *header,
+                        tabby_printer_packet_type type, size_t size) {
+    header->preamble[0] = 0x88;
+    header->preamble[1] = 0x33;
+    header->type        = type;
+    header->compression = TABBY_PRINTER_COMPRESSION_NONE;
+    header->size        = (uint16_t)size;
+}
+
+int tabby_printer_init(int fd,
+                       tabby_printer_response *response) {
+    tabby_printer_packet header;
+
+    init_header(&header, TABBY_PRINTER_PACKET_INIT, 0);
+
+    return tabby_printer_packet_send(fd, &header, NULL, response);
+}
+
+int tabby_printer_send_inquiry(int fd,
+                               tabby_printer_response *response) {
+    tabby_printer_packet header;
+
+    init_header(&header, TABBY_PRINTER_PACKET_INQUIRY, 0);
+
+    return tabby_printer_packet_send(fd, &header, NULL, response);
+}
+
+int tabby_printer_job_start(int fd, uint8_t sheets,
+                                    uint8_t linefeeds,
+                                    uint8_t palette,
+                                    uint8_t density,
+                                    tabby_printer_response *response) {
+    tabby_printer_packet header;
+
+    uint8_t body[4] = {
+        sheets, linefeeds, palette, density
+    };
+
+    init_header(&header, TABBY_PRINTER_PACKET_INQUIRY, sizeof(body));
+
+    return tabby_printer_packet_send(fd, &header, &body, response);
+}
+
+int tabby_printer_job_finish(int fd,
+                             tabby_printer_response *response) {
+    tabby_printer_packet header;
+
+    init_header(&header, TABBY_PRINTER_PACKET_DATA, 0);
+
+    return tabby_printer_packet_send(fd, &header, NULL, response);
+}
+
+int tabby_printer_job_cancel(int fd,
+                             tabby_printer_response *response) {
+    tabby_printer_packet header;
+
+    init_header(&header, TABBY_PRINTER_PACKET_CANCEL, 0);
+
+    return tabby_printer_packet_send(fd, &header, NULL, response);
+}
+
+int tabby_printer_send_sheet(int fd, void *data,
+                                     tabby_printer_response *response) {
+    int i;
+    size_t offset = 0;
+
+    for (i=0; i<TABBY_PRINTER_SHEET_BANDS; i++) {
+        tabby_printer_packet   header;
+        tabby_printer_response current;
+
+        init_header(&header,
+                    TABBY_PRINTER_PACKET_DATA,
+                    TABBY_PRINTER_BAND_SIZE);
+
+        if (tabby_printer_packet_send(fd, &header,
+                                          ((uint8_t *)data) + offset,
+                                          &current) < 0) {
+            goto error_packet_send;
+        }
+
+        offset += TABBY_PRINTER_BAND_SIZE;
+    }
+
+    return 0;
+
+error_packet_send:
+    return -1;
+}