From b39a63d4d49819bc4e94e82515539e53369f4196 Mon Sep 17 00:00:00 2001
From: XANTRONIX Development
Date: Sun, 2 Jan 2022 16:35:52 -0500
Subject: Initial commit of src/riff.c

---
 include/xas/riff.h |  47 +++++++++++++++++++++
 src/riff.c         | 121 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 168 insertions(+)
 create mode 100644 include/xas/riff.h
 create mode 100644 src/riff.c

diff --git a/include/xas/riff.h b/include/xas/riff.h
new file mode 100644
index 0000000..6dc2d8d
--- /dev/null
+++ b/include/xas/riff.h
@@ -0,0 +1,47 @@
+#ifndef _XAS_RIFF_H
+#define _XAS_RIFF_H
+
+#include <stdint.h>
+#include <sys/types.h>
+
+typedef struct _xas_riff_chunk {
+    char id[4];
+    uint32_t size;
+} xas_riff_chunk;
+
+typedef struct _xas_riff_main_chunk {
+    xas_riff_chunk header;
+    char type[4];
+} xas_riff_main_chunk;
+
+typedef struct _xas_riff_wave_format_chunk {
+    xas_riff_chunk header;
+
+    uint16_t type,
+             channels;
+
+    uint32_t sample_rate,
+             byte_rate;
+
+    uint16_t sample_size,
+             sample_size_bits;
+} xas_riff_wave_chunk;
+
+typedef struct _xas_riff_wave_header {
+    xas_riff_main_chunk riff;
+    xas_riff_wave_chunk wave;
+    xas_riff_chunk data;
+} xas_riff_wave_header;
+
+typedef struct _xas_riff {
+    int fd;
+    size_t size;
+} xas_riff;
+
+xas_riff *xas_riff_open_file(const char *path, int flags);
+
+int xas_riff_close(xas_riff *riff);
+
+ssize_t xas_riff_write(xas_riff *riff, void *data, size_t len);
+
+#endif /* _XAS_RIFF_H */
diff --git a/src/riff.c b/src/riff.c
new file mode 100644
index 0000000..1cf2f85
--- /dev/null
+++ b/src/riff.c
@@ -0,0 +1,121 @@
+#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include <xas/riff.h>
+
+static int header_write(xas_riff *riff) {
+    xas_riff_wave_header header = {
+        .riff = {
+            {
+                .id    = "RIFF",
+                .size = sizeof(xas_riff_wave_chunk)
+                      + sizeof(xas_riff_chunk)
+                      + riff->size
+            },
+
+            .type = "WAVE"
+        },
+
+        .wave = {
+            {
+                .id   = "fmt ",
+                .size = 16
+            },
+
+            .type             = 1,
+            .channels         = 1,
+            .sample_rate      = 44100,
+            .byte_rate        = 176400 / 2,
+            .sample_size      = 2,
+            .sample_size_bits = 16
+        },
+
+        {
+            .id   = "data",
+            .size = riff->size
+        }
+    };
+
+    if (lseek(riff->fd, 0, SEEK_SET) < 0) {
+        goto error_io;
+    }
+
+    if (write(riff->fd, &header, sizeof(header)) < 0) {
+        goto error_io;
+    }
+
+    if (lseek(riff->fd, 0, SEEK_END) < 0) {
+        goto error_io;
+    }
+
+    return 0;
+
+error_io:
+    return -1;
+}
+
+xas_riff *xas_riff_open_file(const char *path, int flags) {
+    xas_riff *riff;
+
+    if ((riff = malloc(sizeof(*riff))) == NULL) {
+        goto error_malloc_riff;
+    }
+
+    riff->fd = (flags & O_CREAT)? open(path, flags, 0644):
+                                  open(path, flags);
+
+    if (riff->fd < 0) {
+        goto error_open;
+    }
+
+    riff->size = 0;
+
+    if (header_write(riff) < 0) {
+        goto error_header_write;
+    }
+
+    return riff;
+
+error_header_write:
+    (void)close(riff->fd);
+
+error_open:
+    free(riff);
+
+error_malloc_riff:
+    return NULL;
+}
+
+int xas_riff_close(xas_riff *riff) {
+    if (lseek(riff->fd, 0, SEEK_SET) < 0) {
+        goto error_io;
+    }
+
+    if (header_write(riff) < 0) {
+        goto error_header_write;
+    }
+
+    (void)close(riff->fd);
+
+    return 0;
+
+error_header_write:
+error_io:
+    return -1;
+}
+
+ssize_t xas_riff_write(xas_riff *riff, void *data, size_t len) {
+    ssize_t wrlen;
+
+    if ((wrlen = write(riff->fd, data, len)) < 0) {
+        goto error_write;
+    }
+
+    riff->size += wrlen;
+
+    return wrlen;
+
+error_write:
+    return -1;
+}
-- 
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