libmisc/xz: Add xz decompression.

Add support to untar XZ compressed files.

1 files changed, 109 insertions, 0 deletions

diff --git a/cpukit/libmisc/untar/untar_txz.c b/cpukit/libmisc/untar/untar_txz.c
new file mode 100644
index 0000000000..89c7a06e85
--- /dev/null
+++ b/cpukit/libmisc/untar/untar_txz.c
@@ -0,0 +1,109 @@
+/*
+ * Copyright (c) 2016 Chris Johns <chrisj.rtems.org>.  All rights reserved.
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.org/license/LICENSE.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <rtems/untar.h>
+
+int Untar_XzChunkContext_Init(
+  Untar_XzChunkContext *ctx,
+  enum xz_mode mode,
+  uint32_t dict_max,
+  void *inflateBuffer,
+  size_t inflateBufferSize
+)
+{
+  int status = UNTAR_SUCCESSFUL;
+
+  xz_crc32_init();
+
+  Untar_ChunkContext_Init(&ctx->base);
+  ctx->inflateBuffer = inflateBuffer;
+  ctx->inflateBufferSize = inflateBufferSize;
+  ctx->strm = xz_dec_init(mode, dict_max);
+  if (ctx->strm == NULL) {
+    status = UNTAR_FAIL;
+  }
+
+  return status;
+}
+
+int Untar_FromXzChunk_Print(
+  Untar_XzChunkContext *ctx,
+  void *chunk,
+  size_t chunk_size,
+  const rtems_printer *printer
+)
+{
+  int untar_status = UNTAR_SUCCESSFUL;
+  enum xz_ret status = XZ_OK;
+
+  if (ctx->strm == NULL)
+    return UNTAR_FAIL;
+
+  ctx->buf.in = (const uint8_t*) chunk;
+  ctx->buf.in_pos = 0;
+  ctx->buf.in_size = chunk_size;
+  ctx->buf.out = (uint8_t *) ctx->inflateBuffer;
+
+  /* Inflate until output buffer is not full */
+  do {
+    ctx->buf.out_pos = 0;
+    ctx->buf.out_size = ctx->inflateBufferSize;
+    status = xz_dec_run(ctx->strm, &ctx->buf);
+    if (status == XZ_OPTIONS_ERROR)
+      status = XZ_OK;
+    if (status == XZ_OK && ctx->buf.out_pos != 0) {
+      untar_status = Untar_FromChunk_Print(&ctx->base,
+                                           ctx->inflateBuffer,
+                                           ctx->buf.out_pos,
+                                           NULL);
+      if (untar_status != UNTAR_SUCCESSFUL) {
+        break;
+      }
+    }
+  } while (ctx->buf.in_pos != ctx->buf.in_size && status == XZ_OK);
+
+  if (status != XZ_OK) {
+    xz_dec_end(ctx->strm);
+    ctx->strm = NULL;
+    if (untar_status == UNTAR_SUCCESSFUL) {
+      switch (status) {
+      case XZ_OK:
+      case XZ_STREAM_END:
+        break;
+      case XZ_UNSUPPORTED_CHECK:
+        rtems_printf(printer, "XZ unsupported check\n");
+        break;
+      case XZ_MEM_ERROR:
+        rtems_printf(printer, "XZ memory allocation error\n");
+        break;
+      case XZ_MEMLIMIT_ERROR:
+        rtems_printf(printer, "XZ memory usage limit reached\n");
+        break;
+      case XZ_FORMAT_ERROR:
+        rtems_printf(printer, "Not a XZ file\n");
+        break;
+      case XZ_OPTIONS_ERROR:
+        rtems_printf(printer, "Unsupported options in XZ header\n");
+        break;
+      case XZ_DATA_ERROR:
+        rtems_printf(printer, "XZ file is corrupt (data)\n");
+        break;
+      case XZ_BUF_ERROR:
+        rtems_printf(printer, "XZ file is corrupt (buffer)\n");
+        break;
+      }
+      untar_status = UNTAR_FAIL;
+    }
+  }
+
+  return untar_status;
+}