/* Copyright (C) 2001-2023 Artifex Software, Inc.
   All Rights Reserved.

   This software is provided AS-IS with no warranty, either express or
   implied.

   This software is distributed under license and may not be copied,
   modified or distributed except as expressly authorized under the terms
   of the license contained in the file LICENSE in this distribution.

   Refer to licensing information at http://www.artifex.com or contact
   Artifex Software, Inc.,  39 Mesa Street, Suite 108A, San Francisco,
   CA 94129, USA, for further information.
*/


/* CMap creation operator */
#include "memory_.h"
#include "ghost.h"
#include "oper.h"
#include "gsmatrix.h"		/* for gxfont.h */
#include "gsstruct.h"
#include "gsutil.h"		/* for bytes_compare */
#include "gxfcmap1.h"
#include "gxfont.h"
#include "ialloc.h"
#include "icid.h"
#include "iddict.h"
#include "idparam.h"
#include "ifont.h"		/* for zfont_mark_glyph_name */
#include "iname.h"
#include "store.h"

/* Exported for zfont0.c */
int ztype0_get_cmap(const gs_cmap_t ** ppcmap, const ref * pfdepvector,
                    const ref * op, gs_memory_t *imem);

/*
 * Define whether to check the compatibility of CIDSystemInfo between the
 * CMap and the composite font.  PLRM2 says compatibility is required, but
 * PLRM3 says the interpreter doesn't check it.
 */
/*#define CHECK_CID_SYSTEM_INFO_COMPATIBILITY*/

/* ---------------- Internal procedures ---------------- */

/* Free a code map in case of VMerror. */
static void
free_code_map(gx_code_map_t * pcmap, gs_memory_t * mem)
{
    if (pcmap->lookup) {
        int i;

        for (i = 0; i < pcmap->num_lookup; ++i) {
            gx_cmap_lookup_range_t *pclr = &pcmap->lookup[i];

            if (pclr->value_type == CODE_VALUE_GLYPH)
                gs_free_string(mem, pclr->values.data, pclr->values.size,
                               "free_code_map(values)");
        }
        gs_free_object(mem, pcmap->lookup, "free_code_map(map)");
    }
}

/* Convert code ranges to internal form. */
static int
acquire_code_ranges(gs_cmap_adobe1_t *cmap, const ref *pref, gs_memory_t *mem)
{
    uint num_ranges = 0;
    gx_code_space_range_t *ranges;
    uint i, j, elem_sz;
    ref elem;

    if (!r_is_array(pref))
        return_error(gs_error_rangecheck);
    for (i=0; i < r_size(pref); i++) {
        int code = array_get(mem, pref, i, &elem);
        if (code < 0)
            return code;
        elem_sz = r_size(&elem);
        if (elem_sz & 1)
            return_error(gs_error_rangecheck);
        num_ranges += elem_sz;
    }
    if (num_ranges == 0)
        return_error(gs_error_rangecheck);
    num_ranges >>= 1;

    ranges = (gx_code_space_range_t *)
        gs_alloc_byte_array(mem, num_ranges, sizeof(gx_code_space_range_t),
                            "acquire_code_ranges");
    if (ranges == 0)
        return_error(gs_error_VMerror);
    cmap->code_space.ranges = ranges;
    cmap->code_space.num_ranges = num_ranges;

    for (i = 0; i < r_size(pref); i++) {
        array_get(mem, pref, i, &elem);
        elem_sz = r_size(&elem);
        for (j = 0; j < elem_sz; j += 2) {
        ref rfirst, rlast;
        int size;

            array_get(mem, &elem, j, &rfirst);
            array_get(mem, &elem, j + 1, &rlast);
        if (!r_has_type(&rfirst, t_string) ||
            !r_has_type(&rlast, t_string) ||
            (size = r_size(&rfirst)) == 0 || size > MAX_CMAP_CODE_SIZE ||
            r_size(&rlast) != size ||
            memcmp(rfirst.value.bytes, rlast.value.bytes, size) > 0)
            return_error(gs_error_rangecheck);
        memcpy(ranges->first, rfirst.value.bytes, size);
        memcpy(ranges->last, rlast.value.bytes, size);
        ranges->size = size;
            ++ranges;
        }
    }
    return 0;
}

/* Convert a code map to internal form. */
static int
acquire_code_map(gx_code_map_t *pcmap, const ref *pref, gs_cmap_adobe1_t *root,
                 gs_memory_t *mem)
{
    uint num_lookup = 0;
    gx_cmap_lookup_range_t *pclr;
    long i;
    ref elem;
    uint elem_sz;

    if (!r_is_array(pref))
        return_error(gs_error_rangecheck);
    for (i=0; i < r_size(pref); i++) {
        int code = array_get(mem, pref, i, &elem);
        if (code < 0)
            return code;
        elem_sz = r_size(&elem);
        if (elem_sz % 5 != 0)
        return_error(gs_error_rangecheck);
        num_lookup += elem_sz;
    }
    num_lookup /= 5;
    pclr = gs_alloc_struct_array(mem, num_lookup, gx_cmap_lookup_range_t,
                                 &st_cmap_lookup_range_element,
                                 "acquire_code_map(lookup ranges)");
    if (pclr == 0)
        return_error(gs_error_VMerror);
    memset(pclr, 0, sizeof(*pclr) * num_lookup);
    pcmap->lookup = pclr;
    pcmap->num_lookup = num_lookup;

    for (i = 0; i < r_size(pref); i++) {
        uint j;
        array_get(mem, pref, i, &elem);
        elem_sz = r_size(&elem);
        for (j = 0; j < elem_sz; j += 5) {
        ref rprefix, rmisc, rkeys, rvalues, rfxs;

            array_get(mem, &elem, j, &rprefix);
            array_get(mem, &elem, j + 1, &rmisc);
            array_get(mem, &elem, j + 2, &rkeys);
            array_get(mem, &elem, j + 3, &rvalues);
            array_get(mem, &elem, j + 4, &rfxs);

        if (!r_has_type(&rprefix, t_string) ||
            !r_has_type(&rmisc, t_string) ||
            !r_has_type(&rkeys, t_string) ||
            !(r_has_type(&rvalues, t_string) || r_is_array(&rvalues)) ||
            !r_has_type(&rfxs, t_integer)
            )
            return_error(gs_error_typecheck);
        if (r_size(&rmisc) != 4 ||
            rmisc.value.bytes[0] > MAX_CMAP_CODE_SIZE - r_size(&rprefix) ||
            rmisc.value.bytes[1] > 1 ||
            rmisc.value.bytes[2] > CODE_VALUE_MAX ||
            rmisc.value.bytes[3] == 0)
            return_error(gs_error_rangecheck);
        pclr->cmap = root;
        pclr->key_size = rmisc.value.bytes[0];
        pclr->key_prefix_size = r_size(&rprefix);
        memcpy(pclr->key_prefix, rprefix.value.bytes, pclr->key_prefix_size);
        pclr->key_is_range = rmisc.value.bytes[1];
        if (pclr->key_size == 0) {
            /* This is a single entry consisting only of the prefix. */
            if (r_size(&rkeys) != 0)
                return_error(gs_error_rangecheck);
            pclr->num_entries = 1;
        } else {
            int step = pclr->key_size * (pclr->key_is_range ? 2 : 1);

            if (r_size(&rkeys) % step != 0)
                return_error(gs_error_rangecheck);
            pclr->num_entries = r_size(&rkeys) / step;
        }
        pclr->keys.data = rkeys.value.bytes,
            pclr->keys.size = r_size(&rkeys);
        pclr->value_type = rmisc.value.bytes[2];
        pclr->value_size = rmisc.value.bytes[3];
        if (r_has_type(&rvalues, t_string)) {
            if (pclr->value_type == CODE_VALUE_GLYPH)
                return_error(gs_error_rangecheck);
            if (r_size(&rvalues) % pclr->num_entries != 0 ||
                r_size(&rvalues) / pclr->num_entries != pclr->value_size)
                return_error(gs_error_rangecheck);
            pclr->values.data = rvalues.value.bytes,
                pclr->values.size = r_size(&rvalues);
        } else {
            uint values_size = pclr->num_entries * pclr->value_size;
            long k;
            byte *pvalue;

            if (pclr->value_type != CODE_VALUE_GLYPH ||
                r_size(&rvalues) != pclr->num_entries ||
                pclr->value_size > sizeof(gs_glyph))
                return_error(gs_error_rangecheck);
            pclr->values.data = gs_alloc_string(mem, values_size,
                                                "acquire_code_map(values)");
            if (pclr->values.data == 0)
                return_error(gs_error_VMerror);
            pclr->values.size = values_size;
            pvalue = pclr->values.data;
            for (k = 0; k < pclr->num_entries; ++k) {
                ref rvalue;
                gs_glyph value;
                int i;

                array_get(mem, &rvalues, k, &rvalue);
                if (!r_has_type(&rvalue, t_name))
                    return_error(gs_error_rangecheck);
                value = name_index(mem, &rvalue);
                /*
                 * We need a special check here because some CPUs cannot
                 * shift by the full size of an int or long.
                 */
                if (pclr->value_size < sizeof(value) &&
                    (value >> (pclr->value_size * 8)) != 0
                    )
                    return_error(gs_error_rangecheck);
                for (i = pclr->value_size; --i >= 0; )
                    *pvalue++ = (byte)(value >> (i * 8));
            }
        }
        check_int_leu_only(rfxs, 0xff);
        pclr->font_index = (int)rfxs.value.intval;
            ++pclr;
        }
    }
    return 0;
}

/*
 * Acquire the CIDSystemInfo array from a dictionary.  If missing, fabricate
 * a 0-element array and return 1.
 */
static int
acquire_cid_system_info(ref *psia, const ref *op)
{
    ref *prcidsi;

    if (dict_find_string(op, "CIDSystemInfo", &prcidsi) <= 0) {
        make_empty_array(psia, a_readonly);
        return 1;
    }
    if (r_has_type(prcidsi, t_dictionary)) {
        make_array(psia, a_readonly, 1, prcidsi);
        return 0;
    }
    if (!r_is_array(prcidsi))
        return_error(gs_error_typecheck);
    *psia = *prcidsi;
    return 0;
}

/*
 * Get one element of a CIDSystemInfo array.  If the element is missing or
 * null, return 1.
 */
static int
get_cid_system_info(const gs_memory_t *mem, gs_cid_system_info_t *pcidsi, const ref *psia, uint index)
{
    ref rcidsi;
    int code = array_get(mem, psia, (long)index, &rcidsi);

    if (code < 0 || r_has_type(&rcidsi, t_null)) {
        cid_system_info_set_null(pcidsi);
        return 1;
    }
    return cid_system_info_param(pcidsi, &rcidsi);
}

#ifdef CHECK_CID_SYSTEM_INFO_COMPATIBILITY

/* Check compatibility of CIDSystemInfo. */
static bool
bytes_eq(const gs_const_string *pcs1, const gs_const_string *pcs2)
{
    return !bytes_compare(pcs1->data, pcs1->size,
                          pcs2->data, pcs2->size);
}
static bool
cid_system_info_compatible(const gs_cid_system_info_t * psi1,
                           const gs_cid_system_info_t * psi2)
{
    return bytes_eq(&psi1->Registry, &psi2->Registry) &&
        bytes_eq(&psi1->Ordering, &psi2->Ordering);
}

#endif /* CHECK_CID_SYSTEM_INFO_COMPATIBILITY */

/* ---------------- (Semi-)public procedures ---------------- */

extern_st(st_cmap_tt_16bit_format4);
extern_st(st_cmap_identity);
extern_st(st_cmap_ToUnicode);

/* Get the CodeMap from a Type 0 font, and check the CIDSystemInfo of */
/* its subsidiary fonts. */
int
ztype0_get_cmap(const gs_cmap_t **ppcmap, const ref *pfdepvector,
                const ref *op, gs_memory_t *imem)
{
    ref *prcmap;
    ref *pcodemap;
    const gs_cmap_t *pcmap;
    int code;
    uint num_fonts;
    uint i;

    if (dict_find_string(op, "CMap", &prcmap) <= 0 ||
        !r_has_type(prcmap, t_dictionary) ||
        dict_find_string(prcmap, "CodeMap", &pcodemap) <= 0 ||
        !r_is_struct(pcodemap) || (!r_has_stype(pcodemap, imem, st_cmap_tt_16bit_format4) &&
        !r_has_stype(pcodemap, imem, st_cmap_identity) && !r_has_stype(pcodemap, imem, st_cmap_ToUnicode) &&
        !r_has_stype(pcodemap, imem, st_cmap_adobe1))
        )
        return_error(gs_error_invalidfont);
    pcmap = r_ptr(pcodemap, gs_cmap_t);
    num_fonts = r_size(pfdepvector);
    for (i = 0; i < num_fonts; ++i) {
        ref rfdep, rfsi;

        array_get(imem, pfdepvector, (long)i, &rfdep);
        code = acquire_cid_system_info(&rfsi, &rfdep);
        if (code < 0)
            return code;
        if (code == 0) {
            if (r_size(&rfsi) != 1)
                return_error(gs_error_rangecheck);
#ifdef CHECK_CID_SYSTEM_INFO_COMPATIBILITY
            {
                gs_cid_system_info_t cidsi;

                get_cid_system_info(&cidsi, &rfsi, 0);
                if (!cid_system_info_is_null(&cidsi) &&
                    !cid_system_info_compatible(&cidsi,
                                                pcmap->CIDSystemInfo + i))
                    return_error(gs_error_rangecheck);
            }
#endif
        }
    }
    *ppcmap = pcmap;
    return 0;
}

/* ---------------- Operators ---------------- */

/* <CMap> .buildcmap <CMap> */
/*
 * Create the internal form of a CMap.  The initial CMap must be read-write
 * and have an entry with key = CodeMap and value = null; the result is
 * read-only and has a real CodeMap.
 *
 * This operator reads the CMapType, CMapName, CIDSystemInfo, CMapVersion,
 * UIDOffset, XUID, WMode, and .CodeMapData elements of the CMap dictionary.
 * For details, see lib/gs_cmap.ps and the Adobe documentation.
 */
static int
zfcmap_glyph_name(const gs_memory_t *mem,
                  gs_glyph glyph, gs_const_string *pstr, void *proc_data)
{
    ref nref, nsref;

    name_index_ref(mem, (uint)glyph, &nref);
    name_string_ref(mem, &nref, &nsref);
    pstr->data = nsref.value.const_bytes;
    pstr->size = r_size(&nsref);
    return 0;
}
static int
zbuildcmap(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    int code;
    ref *pcmapname;
    ref *puidoffset;
    ref *pcodemapdata;
    ref *pcodemap;
    ref rname, rcidsi, rcoderanges, rdefs, rnotdefs;
    gs_cmap_adobe1_t *pcmap = 0;
    ref rcmap;
    uint i;

    check_type(*op, t_dictionary);
    check_dict_write(*op);
    if ((code = dict_find_string(op, "CMapName", &pcmapname)) <= 0) {
        code = gs_note_error(gs_error_rangecheck);
        goto fail;
    }
    if (!r_has_type(pcmapname, t_name)) {
        code = gs_note_error(gs_error_typecheck);
        goto fail;
    }
    name_string_ref(imemory, pcmapname, &rname);
    if (dict_find_string(op, ".CodeMapData", &pcodemapdata) <= 0 ||
        !r_has_type(pcodemapdata, t_array) ||
        r_size(pcodemapdata) != 3 ||
        dict_find_string(op, "CodeMap", &pcodemap) <= 0 ||
        !r_has_type(pcodemap, t_null)
        ) {
        code = gs_note_error(gs_error_rangecheck);
        goto fail;
    }
    if ((code = acquire_cid_system_info(&rcidsi, op)) < 0)
        goto fail;
    if ((code = gs_cmap_adobe1_alloc(&pcmap, 0, rname.value.const_bytes,
                                     r_size(&rname), r_size(&rcidsi),
                                     0, 0, 0, 0, 0, imemory)) < 0)
        goto fail;
    if ((code = dict_int_param(op, "CMapType", 0, 1, 0, &pcmap->CMapType)) < 0 ||
        (code = dict_float_param(op, "CMapVersion", 0.0, &pcmap->CMapVersion)) < 0 ||
        (code = dict_uid_param(op, &pcmap->uid, 0, imemory, i_ctx_p)) < 0 ||
        (code = dict_int_param(op, "WMode", 0, 1, 0, &pcmap->WMode)) < 0
        )
        goto fail;
    if (dict_find_string(op, "UIDOffset", &puidoffset) > 0) {
        if (!r_has_type(puidoffset, t_integer)) {
            code = gs_note_error(gs_error_typecheck);
            goto fail;
        }
        pcmap->UIDOffset = puidoffset->value.intval; /* long, not int */
    }
    for (i = 0; i < r_size(&rcidsi); ++i) {
        code = get_cid_system_info(imemory, pcmap->CIDSystemInfo + i, &rcidsi, i);
        if (code < 0)
            goto fail;
    }
    array_get(imemory, pcodemapdata, 0L, &rcoderanges);
    array_get(imemory, pcodemapdata, 1L, &rdefs);
    array_get(imemory, pcodemapdata, 2L, &rnotdefs);
    if ((code = acquire_code_ranges(pcmap, &rcoderanges, imemory)) < 0)
        goto fail;
    if ((code = acquire_code_map(&pcmap->def, &rdefs, pcmap, imemory)) < 0)
        goto fail;
    if ((code = acquire_code_map(&pcmap->notdef, &rnotdefs, pcmap, imemory)) < 0)
        goto fail;
    if (!bytes_compare(pcmap->CIDSystemInfo->Registry.data, pcmap->CIDSystemInfo->Registry.size,
                    (const byte *)"Artifex", 7) &&
        !bytes_compare(pcmap->CIDSystemInfo->Ordering.data, pcmap->CIDSystemInfo->Ordering.size,
                    (const byte *)"Unicode", 7))
        pcmap->from_Unicode = true;
    pcmap->mark_glyph = zfont_mark_glyph_name;
    pcmap->mark_glyph_data = 0;
    pcmap->glyph_name = zfcmap_glyph_name;
    pcmap->glyph_name_data = 0;
    make_istruct_new(&rcmap, a_readonly, pcmap);
    code = idict_put_string(op, "CodeMap", &rcmap);
    if (code < 0)
        goto fail;
    return zreadonly(i_ctx_p);
fail:
    if (pcmap) {
        free_code_map(&pcmap->notdef, imemory);
        free_code_map(&pcmap->def, imemory);
        ifree_object(pcmap->CIDSystemInfo, "zbuildcmap(CIDSystemInfo)");
        ifree_object(pcmap, "zbuildcmap(cmap)");
    }
    return code;
}

/* ------ Initialization procedure ------ */

const op_def zfcmap_op_defs[] =
{
    {"1.buildcmap", zbuildcmap},
    op_def_end(0)
};