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Make loadPNG() able to read files from OPK packages.

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The filename passed to it should contain the filename of the squashfs
image, the character '#', and the filename of the .png file contained
inside the package.

E.g.:
/tmp/package.opk#icon.png
This commit is contained in:
Paul Cercueil 2012-10-07 20:04:30 +02:00
parent 45be8af9f0
commit 0cbb5ee09a
1 changed files with 59 additions and 5 deletions
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56
src/imageio.cpp
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@ -12,6 +12,32 @@
#include <png.h>
#include <cassert>
#ifdef HAVE_LIBOPK
#include <opk.h>
struct OpkParams {
std::string *sqfs_file, *icon_file;
unsigned int offset;
char *buf;
};
static void __readFromOpk(png_structp png_ptr, png_bytep ptr, png_size_t length)
{
struct OpkParams *params = (struct OpkParams *) png_get_io_ptr(png_ptr);
if (!params->buf) {
params->buf = unsquashfs_single_file(params->sqfs_file->c_str(),
params->icon_file->c_str());
if (!params->buf) {
png_error(png_ptr, "Unable to open OPK package\n");
return;
}
}
memcpy(ptr, params->buf + params->offset, length);
params->offset += length;
}
#endif
SDL_Surface *loadPNG(const std::string &path) {
// Declare these with function scope and initialize them to NULL,
@ -20,6 +46,10 @@ SDL_Surface *loadPNG(const std::string &path) {
FILE *fp = NULL;
png_structp png = NULL;
png_infop info = NULL;
#ifdef HAVE_LIBOPK
struct OpkParams *params = NULL;
std::string::size_type pos;
#endif
// Create and initialize the top-level libpng struct.
png = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
@ -37,11 +67,28 @@ SDL_Surface *loadPNG(const std::string &path) {
goto cleanup;
}
// Open input file.
#ifdef HAVE_LIBOPK
pos = path.find('#');
if (pos != path.npos) {
DEBUG("Registering specific callback for icon %s\n", path.c_str());
params = (struct OpkParams *) malloc(sizeof(*params));
params->sqfs_file = new std::string(path.substr(0, pos));
params->icon_file = new std::string(path.substr(pos + 1));
params->offset = 0;
params->buf = NULL;
png_set_read_fn(png, params, __readFromOpk);
} else {
#else
if (1) {
#endif /* HAVE_LIBOPK */
fp = fopen(path.c_str(), "rb");
if (!fp) goto cleanup;
// Set up the input control if you are using standard C streams.
png_init_io(png, fp);
}
// The call to png_read_info() gives us all of the information from the
// PNG file before the first IDAT (image data chunk).
@ -117,6 +164,13 @@ cleanup:
// Clean up.
png_destroy_read_struct(&png, &info, NULL);
if (fp) fclose(fp);
#ifdef HAVE_LIBOPK
if (params) {
if (params->buf)
free(params->buf);
free(params);
}
#endif
return surface;
}