1 files changed, 334 insertions, 0 deletions

diff --git a/src/jpeg.c b/src/jpeg.c
new file mode 100644
index 00000000..fbf3eeee
--- /dev/null
+++ b/src/jpeg.c
@@ -0,0 +1,334 @@
+/*
+ * File: jpeg.c
+ *
+ * Copyright (C) 1997 Raph Levien <raph@acm.org>
+ * Copyright (C) 2000-2006 Jorge Arellano Cid <jcid@dillo.org>
+ *
+ * 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.
+ */
+
+/*
+ * The jpeg decoder for dillo. It is responsible for decoding JPEG data
+ * and transferring it to the dicache. It uses libjpeg to do the actual
+ * decoding.
+ */
+
+#include <config.h>
+#ifdef ENABLE_JPEG
+
+#include <stdio.h>
+#include <setjmp.h>
+
+/* avoid a redefinition of HAVE_STDLIB_H with old jpeglib.h */
+#ifdef HAVE_STDLIB_H
+#  undef HAVE_STDLIB_H
+#endif
+#include <jpeglib.h>
+#ifdef HAVE_STDLIB_H
+#  undef HAVE_STDLIB_H
+#endif
+
+#include "image.hh"
+#include "web.hh"
+#include "cache.h"
+#include "dicache.h"
+
+#define DEBUG_LEVEL 6
+#include "debug.h"
+
+typedef enum {
+   DILLO_JPEG_INIT,
+   DILLO_JPEG_STARTING,
+   DILLO_JPEG_READING,
+   DILLO_JPEG_DONE,
+   DILLO_JPEG_ERROR
+} DilloJpegState;
+
+/* An implementation of a suspending source manager */
+
+typedef struct {
+   struct jpeg_source_mgr pub;  /* public fields */
+   struct DilloJpeg *jpeg;      /* a pointer back to the jpeg object */
+} my_source_mgr;
+
+struct my_error_mgr {
+   struct jpeg_error_mgr pub;    /* "public" fields */
+   jmp_buf setjmp_buffer;        /* for return to caller */
+};
+typedef struct my_error_mgr * my_error_ptr;
+
+typedef struct DilloJpeg {
+   DilloImage *Image;
+   DilloUrl *url;
+   int version;
+
+   my_source_mgr Src;
+
+   DilloJpegState state;
+   size_t Start_Ofs, Skip, NewStart;
+   char *Data;
+
+   uint_t y;
+
+   struct jpeg_decompress_struct cinfo;
+   struct my_error_mgr jerr;
+} DilloJpeg;
+
+/*
+ * Forward declarations
+ */
+static DilloJpeg *Jpeg_new(DilloImage *Image, DilloUrl *url, int version);
+static void Jpeg_callback(int Op, CacheClient_t *Client);
+static void Jpeg_write(DilloJpeg *jpeg, void *Buf, uint_t BufSize);
+static void Jpeg_close(DilloJpeg *jpeg, CacheClient_t *Client);
+METHODDEF(void) Jpeg_errorexit (j_common_ptr cinfo);
+
+/* exported function */
+void *a_Jpeg_image(const char *Type, void *P, CA_Callback_t *Call,
+                   void **Data);
+
+
+/* this is the routine called by libjpeg when it detects an error. */
+METHODDEF(void) Jpeg_errorexit (j_common_ptr cinfo)
+{
+   /* display message and return to setjmp buffer */
+   my_error_ptr myerr = (my_error_ptr) cinfo->err;
+   (*cinfo->err->output_message) (cinfo);
+   longjmp(myerr->setjmp_buffer, 1);
+}
+
+/*
+ * MIME handler for "image/jpeg" type
+ * (Sets Jpeg_callback or a_Dicache_callback as the cache-client)
+ */
+void *a_Jpeg_image(const char *Type, void *P, CA_Callback_t *Call,
+                   void **Data)
+{
+   DilloWeb *web = P;
+   DICacheEntry *DicEntry;
+
+   if (!web->Image)
+      web->Image = a_Image_new(0, 0, NULL, 0);
+
+   /* Add an extra reference to the Image (for dicache usage) */
+   a_Image_ref(web->Image);
+
+   DicEntry = a_Dicache_get_entry(web->url);
+   if (!DicEntry) {
+      /* Let's create an entry for this image... */
+      DicEntry = a_Dicache_add_entry(web->url);
+
+      /* ... and let the decoder feed it! */
+      *Data = Jpeg_new(web->Image, DicEntry->url, DicEntry->version);
+      *Call = (CA_Callback_t) Jpeg_callback;
+   } else {
+      /* Let's feed our client from the dicache */
+      a_Dicache_ref(DicEntry->url, DicEntry->version);
+      *Data = web->Image;
+      *Call = (CA_Callback_t) a_Dicache_callback;
+   }
+   return (web->Image->dw);
+}
+
+/*
+ * Finish the decoding process
+ */
+static void Jpeg_close(DilloJpeg *jpeg, CacheClient_t *Client)
+{
+   a_Dicache_close(jpeg->url, jpeg->version, Client);
+
+   if (jpeg->state != DILLO_JPEG_DONE) {
+      jpeg_destroy_decompress(&(jpeg->cinfo));
+   }
+   dFree(jpeg);
+}
+
+static void init_source(j_decompress_ptr cinfo)
+{
+}
+
+static boolean fill_input_buffer(j_decompress_ptr cinfo)
+{
+   DilloJpeg *jpeg = ((my_source_mgr *) cinfo->src)->jpeg;
+
+   DEBUG_MSG(5, "fill_input_buffer\n");
+#if 0
+   if (!cinfo->src->bytes_in_buffer) {
+      DEBUG_MSG(5, "fill_input_buffer: %ld bytes in buffer\n",
+                (long)cinfo->src->bytes_in_buffer);
+
+      jpeg->Start_Ofs = (ulong_t) jpeg->cinfo.src->next_input_byte -
+         (ulong_t) jpeg->Data;
+#endif
+      if (jpeg->Skip) {
+         jpeg->Start_Ofs = jpeg->NewStart + jpeg->Skip - 1;
+         jpeg->Skip = 0;
+      } else {
+         jpeg->Start_Ofs = (ulong_t) jpeg->cinfo.src->next_input_byte -
+            (ulong_t) jpeg->Data;
+      }
+      return FALSE;
+#if 0
+   }
+   return TRUE;
+#endif
+}
+
+static void skip_input_data(j_decompress_ptr cinfo, long num_bytes)
+{
+   DilloJpeg *jpeg;
+
+   if (num_bytes < 1)
+      return;
+   jpeg = ((my_source_mgr *) cinfo->src)->jpeg;
+
+   DEBUG_MSG(5, "skip_input_data: Start_Ofs = %lu, num_bytes = %ld,"
+             " %ld bytes in buffer\n",
+             (ulong_t)jpeg->Start_Ofs, num_bytes,
+             (long)cinfo->src->bytes_in_buffer);
+
+   cinfo->src->next_input_byte += num_bytes;
+   if (num_bytes < (long)cinfo->src->bytes_in_buffer) {
+      cinfo->src->bytes_in_buffer -= num_bytes;
+   } else {
+      jpeg->Skip += num_bytes - cinfo->src->bytes_in_buffer + 1;
+      cinfo->src->bytes_in_buffer = 0;
+   }
+}
+
+static void term_source(j_decompress_ptr cinfo)
+{
+}
+
+static DilloJpeg *Jpeg_new(DilloImage *Image, DilloUrl *url, int version)
+{
+   my_source_mgr *src;
+   DilloJpeg *jpeg = dMalloc(sizeof(*jpeg));
+
+   jpeg->Image = Image;
+   jpeg->url = url;
+   jpeg->version = version;
+
+   jpeg->state = DILLO_JPEG_INIT;
+   jpeg->Start_Ofs = 0;
+   jpeg->Skip = 0;
+
+   /* decompression step 1 (see libjpeg.doc) */
+   jpeg->cinfo.err = jpeg_std_error(&(jpeg->jerr.pub));
+   jpeg->jerr.pub.error_exit = Jpeg_errorexit;
+
+   jpeg_create_decompress(&(jpeg->cinfo));
+
+   /* decompression step 2 (see libjpeg.doc) */
+   jpeg->cinfo.src = &jpeg->Src.pub;
+   src = &jpeg->Src;
+   src->pub.init_source = init_source;
+   src->pub.fill_input_buffer = fill_input_buffer;
+   src->pub.skip_input_data = skip_input_data;
+   src->pub.resync_to_restart = jpeg_resync_to_restart;/* use default method */
+   src->pub.term_source = term_source;
+   src->pub.bytes_in_buffer = 0;   /* forces fill_input_buffer on first read */
+   src->pub.next_input_byte = NULL;/* until buffer loaded */
+
+   src->jpeg = jpeg;
+
+   /* decompression steps continue in write method */
+   return jpeg;
+}
+
+static void Jpeg_callback(int Op, CacheClient_t *Client)
+{
+   if (Op)
+      Jpeg_close(Client->CbData, Client);
+   else
+      Jpeg_write(Client->CbData, Client->Buf, Client->BufSize);
+}
+
+/*
+ * Receive and process new chunks of JPEG image data
+ */
+static void Jpeg_write(DilloJpeg *jpeg, void *Buf, uint_t BufSize)
+{
+   DilloImgType type;
+   uchar_t *linebuf;
+   JSAMPLE *array[1];
+   int num_read;
+
+   DEBUG_MSG(5, "Jpeg_write: (%p) Bytes in buff: %ld Ofs: %lu\n", jpeg,
+             (long) BufSize, (ulong_t)jpeg->Start_Ofs);
+
+   /* See if we are supposed to skip ahead. */
+   if (BufSize <= jpeg->Start_Ofs)
+      return;
+
+   /* Concatenate with the partial input, if any. */
+   jpeg->cinfo.src->next_input_byte = (uchar_t *)Buf + jpeg->Start_Ofs;
+   jpeg->cinfo.src->bytes_in_buffer = BufSize - jpeg->Start_Ofs;
+   jpeg->NewStart = BufSize;
+   jpeg->Data = Buf;
+
+   if (setjmp(jpeg->jerr.setjmp_buffer)) {
+      /* If we get here, the JPEG code has signaled an error. */
+      jpeg->state = DILLO_JPEG_ERROR;
+   }
+
+   /* Process the bytes in the input buffer. */
+   if (jpeg->state == DILLO_JPEG_INIT) {
+
+      /* decompression step 3 (see libjpeg.doc) */
+      if (jpeg_read_header(&(jpeg->cinfo), TRUE) != JPEG_SUSPENDED) {
+         type = DILLO_IMG_TYPE_GRAY;
+         if (jpeg->cinfo.num_components == 1)
+            type = DILLO_IMG_TYPE_GRAY;
+         else if (jpeg->cinfo.num_components == 3)
+            type = DILLO_IMG_TYPE_RGB;
+         else
+            DEBUG_MSG(5, "jpeg: can't handle %d component images\n",
+                      jpeg->cinfo.num_components);
+         a_Dicache_set_parms(jpeg->url, jpeg->version, jpeg->Image,
+                             (uint_t)jpeg->cinfo.image_width,
+                             (uint_t)jpeg->cinfo.image_height,
+                             type);
+
+         /* decompression step 4 (see libjpeg.doc) */
+         jpeg->state = DILLO_JPEG_STARTING;
+      }
+   }
+   if (jpeg->state == DILLO_JPEG_STARTING) {
+      /* decompression step 5 (see libjpeg.doc) */
+      if (jpeg_start_decompress(&(jpeg->cinfo))) {
+         jpeg->y = 0;
+         jpeg->state = DILLO_JPEG_READING;
+      }
+   }
+   if (jpeg->state == DILLO_JPEG_READING) {
+      linebuf = dMalloc(jpeg->cinfo.image_width *
+                         jpeg->cinfo.num_components);
+      array[0] = linebuf;
+      while (jpeg->y < jpeg->cinfo.image_height) {
+         num_read = jpeg_read_scanlines(&(jpeg->cinfo), array, 1);
+         if (num_read == 0)
+            break;
+         a_Dicache_write(jpeg->Image, jpeg->url, jpeg->version,
+                         linebuf, 0, jpeg->y);
+
+         jpeg->y++;
+      }
+      if (jpeg->y == jpeg->cinfo.image_height) {
+         DEBUG_MSG(5, "height achieved\n");
+
+         jpeg_destroy_decompress(&(jpeg->cinfo));
+         jpeg->state = DILLO_JPEG_DONE;
+      }
+      dFree(linebuf);
+   }
+   if (jpeg->state == DILLO_JPEG_ERROR) {
+      jpeg_destroy_decompress(&(jpeg->cinfo));
+      jpeg->state = DILLO_JPEG_DONE;
+   }
+}
+
+#endif /* ENABLE_JPEG */