kolibrios/contrib/media/updf/xps/xps_doc.c

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C
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#include "fitz.h"
#include "muxps.h"
/*
* The FixedDocumentSequence and FixedDocument parts determine
* which parts correspond to actual pages, and the page order.
*/
void
xps_debug_page_list(xps_context *ctx)
{
xps_document *fixdoc = ctx->first_fixdoc;
xps_page *page = ctx->first_page;
if (ctx->start_part)
printf("start part %s\n", ctx->start_part);
while (fixdoc)
{
printf("fixdoc %s\n", fixdoc->name);
fixdoc = fixdoc->next;
}
while (page)
{
printf("page %s w=%d h=%d\n", page->name, page->width, page->height);
page = page->next;
}
}
static void
xps_add_fixed_document(xps_context *ctx, char *name)
{
xps_document *fixdoc;
/* Check for duplicates first */
for (fixdoc = ctx->first_fixdoc; fixdoc; fixdoc = fixdoc->next)
if (!strcmp(fixdoc->name, name))
return;
fixdoc = fz_malloc(sizeof(xps_document));
fixdoc->name = fz_strdup(name);
fixdoc->next = NULL;
if (!ctx->first_fixdoc)
{
ctx->first_fixdoc = fixdoc;
ctx->last_fixdoc = fixdoc;
}
else
{
ctx->last_fixdoc->next = fixdoc;
ctx->last_fixdoc = fixdoc;
}
}
static void
xps_add_fixed_page(xps_context *ctx, char *name, int width, int height)
{
xps_page *page;
/* Check for duplicates first */
for (page = ctx->first_page; page; page = page->next)
if (!strcmp(page->name, name))
return;
page = fz_malloc(sizeof(xps_page));
page->name = fz_strdup(name);
page->width = width;
page->height = height;
page->root = NULL;
page->next = NULL;
if (!ctx->first_page)
{
ctx->first_page = page;
ctx->last_page = page;
}
else
{
ctx->last_page->next = page;
ctx->last_page = page;
}
}
static void
xps_free_fixed_pages(xps_context *ctx)
{
xps_page *page = ctx->first_page;
while (page)
{
xps_page *next = page->next;
xps_free_page(ctx, page);
fz_free(page->name);
fz_free(page);
page = next;
}
ctx->first_page = NULL;
ctx->last_page = NULL;
}
static void
xps_free_fixed_documents(xps_context *ctx)
{
xps_document *doc = ctx->first_fixdoc;
while (doc)
{
xps_document *next = doc->next;
fz_free(doc->name);
fz_free(doc);
doc = next;
}
ctx->first_fixdoc = NULL;
ctx->last_fixdoc = NULL;
}
void
xps_free_page_list(xps_context *ctx)
{
xps_free_fixed_documents(ctx);
xps_free_fixed_pages(ctx);
}
/*
* Parse the fixed document sequence structure and _rels/.rels to find the start part.
*/
static void
xps_parse_metadata_imp(xps_context *ctx, xml_element *item)
{
while (item)
{
xps_parse_metadata_imp(ctx, xml_down(item));
if (!strcmp(xml_tag(item), "Relationship"))
{
char *target = xml_att(item, "Target");
char *type = xml_att(item, "Type");
if (target && type)
{
char tgtbuf[1024];
xps_absolute_path(tgtbuf, ctx->base_uri, target, sizeof tgtbuf);
if (!strcmp(type, REL_START_PART))
ctx->start_part = fz_strdup(tgtbuf);
}
}
if (!strcmp(xml_tag(item), "DocumentReference"))
{
char *source = xml_att(item, "Source");
if (source)
{
char srcbuf[1024];
xps_absolute_path(srcbuf, ctx->base_uri, source, sizeof srcbuf);
xps_add_fixed_document(ctx, srcbuf);
}
}
if (!strcmp(xml_tag(item), "PageContent"))
{
char *source = xml_att(item, "Source");
char *width_att = xml_att(item, "Width");
char *height_att = xml_att(item, "Height");
int width = width_att ? atoi(width_att) : 0;
int height = height_att ? atoi(height_att) : 0;
if (source)
{
char srcbuf[1024];
xps_absolute_path(srcbuf, ctx->base_uri, source, sizeof srcbuf);
xps_add_fixed_page(ctx, srcbuf, width, height);
}
}
item = xml_next(item);
}
}
static int
xps_parse_metadata(xps_context *ctx, xps_part *part)
{
xml_element *root;
char buf[1024];
char *s;
/* Save directory name part */
fz_strlcpy(buf, part->name, sizeof buf);
s = strrchr(buf, '/');
if (s)
s[0] = 0;
/* _rels parts are voodoo: their URI references are from
* the part they are associated with, not the actual _rels
* part being parsed.
*/
s = strstr(buf, "/_rels");
if (s)
*s = 0;
ctx->base_uri = buf;
ctx->part_uri = part->name;
root = xml_parse_document(part->data, part->size);
if (!root)
return fz_rethrow(-1, "cannot parse metadata part '%s'", part->name);
xps_parse_metadata_imp(ctx, root);
xml_free_element(root);
ctx->base_uri = NULL;
ctx->part_uri = NULL;
return fz_okay;
}
static int
xps_read_and_process_metadata_part(xps_context *ctx, char *name)
{
xps_part *part;
int code;
part = xps_read_part(ctx, name);
if (!part)
return fz_rethrow(-1, "cannot read zip part '%s'", name);
code = xps_parse_metadata(ctx, part);
if (code)
return fz_rethrow(code, "cannot process metadata part '%s'", name);
xps_free_part(ctx, part);
return fz_okay;
}
int
xps_read_page_list(xps_context *ctx)
{
xps_document *doc;
int code;
code = xps_read_and_process_metadata_part(ctx, "/_rels/.rels");
if (code)
return fz_rethrow(code, "cannot process root relationship part");
if (!ctx->start_part)
return fz_throw("cannot find fixed document sequence start part");
code = xps_read_and_process_metadata_part(ctx, ctx->start_part);
if (code)
return fz_rethrow(code, "cannot process FixedDocumentSequence part");
for (doc = ctx->first_fixdoc; doc; doc = doc->next)
{
code = xps_read_and_process_metadata_part(ctx, doc->name);
if (code)
return fz_rethrow(code, "cannot process FixedDocument part");
}
return fz_okay;
}
int
xps_count_pages(xps_context *ctx)
{
xps_page *page;
int n = 0;
for (page = ctx->first_page; page; page = page->next)
n ++;
return n;
}
static int
xps_load_fixed_page(xps_context *ctx, xps_page *page)
{
xps_part *part;
xml_element *root;
char *width_att;
char *height_att;
part = xps_read_part(ctx, page->name);
if (!part)
return fz_rethrow(-1, "cannot read zip part '%s'", page->name);
root = xml_parse_document(part->data, part->size);
if (!root)
return fz_rethrow(-1, "cannot parse xml part '%s'", page->name);
xps_free_part(ctx, part);
if (strcmp(xml_tag(root), "FixedPage"))
return fz_throw("expected FixedPage element (found %s)", xml_tag(root));
width_att = xml_att(root, "Width");
if (!width_att)
return fz_throw("FixedPage missing required attribute: Width");
height_att = xml_att(root, "Height");
if (!height_att)
return fz_throw("FixedPage missing required attribute: Height");
page->width = atoi(width_att);
page->height = atoi(height_att);
page->root = root;
return 0;
}
int
xps_load_page(xps_page **pagep, xps_context *ctx, int number)
{
xps_page *page;
int code;
int n = 0;
for (page = ctx->first_page; page; page = page->next)
{
if (n == number)
{
if (!page->root)
{
code = xps_load_fixed_page(ctx, page);
if (code)
return fz_rethrow(code, "cannot load page %d", number + 1);
}
*pagep = page;
return fz_okay;
}
n ++;
}
return fz_throw("cannot find page %d", number + 1);
}
void
xps_free_page(xps_context *ctx, xps_page *page)
{
/* only free the XML contents */
if (page->root)
xml_free_element(page->root);
page->root = NULL;
}