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/*
   Copyright (C) 2009 Red Hat, Inc.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/

#include <string.h>
#include <stdint.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>
#include <spice/macros.h>

#define TAB "    "

#define ERROR(str) printf("%s: error: %s\n", prog_name, str); exit(-1);

static char *prog_name = NULL;

static size_t read_input(const char *file_name, uint8_t** out_buf)
{
    int fd = open(file_name, O_RDONLY);
    if (fd == -1) {
        ERROR("open source file failed");
        return 0;
    }
    struct stat file_stat;
    if (fstat(fd, &file_stat) == -1) {
        ERROR("fstat on source file failed");
        return 0;
    }

    uint8_t *buf = malloc(file_stat.st_size);

    if (!buf) {
        close(fd);
        ERROR("alloc mem failed");
        return 0;
    }

    size_t to_read = file_stat.st_size;
    uint8_t *buf_pos = buf;
    while (to_read) {
        int n = read(fd, buf_pos, to_read);
        if (n <= 0) {
            ERROR("read from source file failed");
            close(fd);
            free(buf);
            return 0;
        }
        to_read -= n;
        buf_pos += n;
    }
    close(fd);
    *out_buf = buf;
    return file_stat.st_size;
}

typedef struct __attribute__ ((__packed__)) BitmpaHeader {
    uint32_t header_size;
    uint32_t width;
    uint32_t height;
    uint16_t plans;
    uint16_t bpp;
    uint32_t compression;
    uint32_t image_size;
    uint32_t horizontal_resolution;
    uint32_t vertical_resolution;
    uint32_t num_colors;
    uint32_t important_colors;
} BitmpaHeader;


typedef struct __attribute__ ((__packed__)) ICOHeader {
    uint8_t width;
    uint8_t height;
    uint8_t colors_count;
    uint8_t reserved;
    uint16_t plans;
    uint16_t bpp;
    uint32_t bitmap_size;
    uint32_t bitmap_offset;
} ICOHeader;

typedef struct __attribute__ ((__packed__)) ICOFileHeader {
    uint16_t reserved;
    uint16_t type;
    uint16_t image_count;
    ICOHeader directory[0];
} ICOFileHeader;


typedef struct Icon {
    int width;
    int height;
    uint8_t* pixmap;
    uint8_t* mask;
} Icon;


static Icon *init_icon(uint8_t *buf, size_t buf_size)
{
    ICOFileHeader *file_header;
    int i;

    uint8_t *buf_end = buf + buf_size;

    if (buf_size < sizeof(ICOFileHeader)) {
        ERROR("invalid source file");
        return NULL;
    }

    file_header = (ICOFileHeader *)buf;

    if (file_header->reserved != 0 || file_header->type != 1) {
        ERROR("invalid icon");
        return NULL;
    }

    if (sizeof(ICOFileHeader) + file_header->image_count * sizeof(ICOHeader) > buf_size) {
        ERROR("invalid source file");
    }

    for (i = 0; i < file_header->image_count; i++) {
        int j;

        ICOHeader *ico = &file_header->directory[i];
        printf("%ux%ux%u size %u\n", (unsigned)ico->width, (unsigned)ico->height,
               (unsigned)ico->bpp, ico->bitmap_size);

        if (ico->bitmap_offset + ico->bitmap_size > buf_size) {
            ERROR("invalid source file");
        }
        BitmpaHeader *bitmap = (BitmpaHeader *)(buf + ico->bitmap_offset);
        if (bitmap->header_size != 40) {
            ERROR("invalid bitmap header");
        }

        if (ico->plans == 0) { // 0 and 1 are equivalent
            ico->plans = 1;
        }

        if (bitmap->width != ico->width || bitmap->height != ico->height * 2 ||
            bitmap->plans != ico->plans || bitmap->bpp != ico->bpp) {
            ERROR("invalid bitmap header");
        }

        if (!bitmap->image_size) {
            bitmap->image_size = SPICE_ALIGN(bitmap->bpp * bitmap->width, 32) / 8 * bitmap->height;
        }

        if (bitmap->compression || bitmap->horizontal_resolution || bitmap->vertical_resolution ||
                                                   bitmap->num_colors || bitmap->important_colors) {
            ERROR("invalid bitmap header");
        }

        if (ico->width != 32 || ico->height != 32 || ico->bpp != 32) {
            continue;
        }

        int pixmap_size = bitmap->width * sizeof(uint32_t) * ico->height;
        int mask_size = SPICE_ALIGN(bitmap->width, 8) / 8 * ico->height;
        Icon* icon = malloc(sizeof(*icon) + pixmap_size + mask_size);
        icon->width = ico->width;
        icon->height = ico->height;
        icon->pixmap = (uint8_t *)(icon + 1);
        icon->mask = icon->pixmap + pixmap_size;

        if ((uint8_t *)(bitmap + 1) + pixmap_size + mask_size > buf_end) {
            ERROR("invalid source file");
        }
        memcpy(icon->pixmap, bitmap + 1, pixmap_size);
        memcpy(icon->mask, (uint8_t *)(bitmap + 1) + pixmap_size, mask_size);
        for (j = 0; j < mask_size; j++) {
            icon->mask[j] = ~icon->mask[j];
        }
        return icon;
    }
    printf("%s: missing 32x32x32\n", prog_name);
    return NULL;
}

static inline void put_char(FILE* f, uint8_t val)
{
    fprintf(f, "0x%.2x,", val);
}

static int icon_to_c_struct(const Icon *icon, const char *dest_file, const char *image_name)
{
    int i, j;
    int fd;
    FILE *f;

    if ((fd = open(dest_file, O_WRONLY | O_CREAT | O_TRUNC, 0644)) == -1) {
        ERROR("open dest file failed");
        return -1;
    }

    if (!(f = fdopen(fd, "w"))) {
        ERROR("fdopen failed");
        close(fd);
        return -1;
    }
    uint32_t pixmap_stride = icon->width * sizeof(uint32_t);
    uint32_t pixmap_size = pixmap_stride * icon->height;
    uint32_t mask_stride = SPICE_ALIGN(icon->width, 8) / 8;
    uint32_t mask_size = mask_stride * icon->height;
    fprintf(f, "static const struct {\n"
               TAB "uint32_t width;\n"
               TAB "uint32_t height;\n"
               TAB "uint8_t pixmap[%u];\n"


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