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CPLRecode(): make ISO-8859-2 and -15 and CP437/CP1250/CP1251/CP1252 t…
…o UTF-8 always available (but not other direction yet) This will help for common use cases when using a minimal GDAL build lacking iconv support.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,124 @@ | ||
| // SPDX-License-Identifier: MIT | ||
| // Copyright 2024 Even Rouault | ||
|
|
||
| #include <assert.h> | ||
| #include <iconv.h> | ||
| #include <stdio.h> | ||
| #include <stdlib.h> | ||
|
|
||
| #define ENCODING_MAX_LEN 256 | ||
|
|
||
| static void launder_name(const char *srcEncoding, | ||
| char srcEncodingLaundered[ENCODING_MAX_LEN]) | ||
| { | ||
| snprintf(srcEncodingLaundered, ENCODING_MAX_LEN, "%s", srcEncoding); | ||
| for (int i = 0; srcEncodingLaundered[i]; ++i) | ||
| { | ||
| if (srcEncodingLaundered[i] == '-') | ||
| srcEncodingLaundered[i] = '_'; | ||
| } | ||
| } | ||
|
|
||
| static void generate(FILE *c_file, FILE *h_file, const char *srcEncoding, | ||
| const char *comment) | ||
| { | ||
| iconv_t sConv = iconv_open("UTF-8", srcEncoding); | ||
| if (sConv == (iconv_t)(-1)) | ||
| { | ||
| fprintf(stderr, "iconv_open(%s) failed\n", srcEncoding); | ||
| exit(1); | ||
| } | ||
| char srcEncodingLaundered[ENCODING_MAX_LEN]; | ||
| launder_name(srcEncoding, srcEncodingLaundered); | ||
| fprintf(c_file, "/* %s */\n", comment); | ||
| fprintf(c_file, "static const CPLCodePageConvTable CPL_%s_to_UTF8 = {\n", | ||
| srcEncodingLaundered); | ||
| for (int i = 0; i <= 255; ++i) | ||
| { | ||
| unsigned char c = (unsigned char)i; | ||
| size_t size_in = 1; | ||
| unsigned char out[4] = {0, 0, 0, 0}; | ||
| size_t size_out = sizeof(out); | ||
| char *p_in = (char *)&c; | ||
| char *p_out = (char *)out; | ||
| size_t nConverted = iconv(sConv, &p_in, &size_in, &p_out, &size_out); | ||
| if (i <= 127) | ||
| { | ||
| assert(out[0] == i); | ||
| continue; | ||
| } | ||
| if (nConverted != (size_t)-1) | ||
| { | ||
| const size_t needed = sizeof(out) - size_out; | ||
| assert(needed <= 3); | ||
| fprintf(c_file, " {0x%02X, 0x%02X, 0x%02X},\n", out[0], out[1], | ||
| out[2]); | ||
| } | ||
| else | ||
| { | ||
| fprintf(c_file, " {0, 0, 0}, /* invalid */\n"); | ||
| } | ||
| } | ||
| fprintf(c_file, "};\n\n"); | ||
| iconv_close(sConv); | ||
| } | ||
|
|
||
| int main() | ||
| { | ||
| FILE *c_file = fopen("cpl_character_sets.c", "wb"); | ||
| FILE *h_file = fopen("cpl_character_sets.h", "wb"); | ||
| fprintf(c_file, "/* This file has been generated by " | ||
| "generate_character_set_conv_tables.c */\n"); | ||
| fprintf(c_file, "/* DO NOT EDIT !*/\n\n"); | ||
| fprintf(c_file, "/* clang-format off */\n"); | ||
| fprintf(c_file, "#include \"cpl_port.h\"\n"); | ||
| fprintf(c_file, "#include \"cpl_character_sets.h\"\n\n"); | ||
|
|
||
| fprintf(h_file, "/* This file has been generated by " | ||
| "generate_character_set_conv_tables.c */\n"); | ||
| fprintf(h_file, "/* DO NOT EDIT !*/\n\n"); | ||
| fprintf(h_file, "/* clang-format off */\n"); | ||
| fprintf(h_file, "typedef unsigned char CPLCodePageConvTable[128][3];\n"); | ||
|
|
||
| const struct | ||
| { | ||
| const char *name; | ||
| const char *comment; | ||
| } encodings[] = { | ||
| {"CP437", "Character set of original IBM PC"}, | ||
| {"CP1250", "Central and eastern Europe languages"}, | ||
| {"CP1251", "Cyrillic script"}, | ||
| {"CP1252", | ||
| "Legacy Windows single-byte character set used in a lot of countries"}, | ||
| {"ISO-8859-2", "Central Europe languages"}, | ||
| {"ISO-8859-15", "New Western Europe"}, | ||
| {NULL, NULL}}; | ||
|
|
||
| for (int i = 0; encodings[i].name; ++i) | ||
| { | ||
| generate(c_file, h_file, encodings[i].name, encodings[i].comment); | ||
| } | ||
| fprintf(h_file, "\n"); | ||
| fprintf(h_file, "const CPLCodePageConvTable* " | ||
| "CPLGetConversionTableToUTF8(const char* pszEncoding);\n"); | ||
|
|
||
| fprintf(c_file, "\nconst CPLCodePageConvTable* " | ||
| "CPLGetConversionTableToUTF8(const char* pszEncoding)\n"); | ||
| fprintf(c_file, "{\n"); | ||
| for (int i = 0; encodings[i].name; ++i) | ||
| { | ||
| char srcEncodingLaundered[ENCODING_MAX_LEN]; | ||
| launder_name(encodings[i].name, srcEncodingLaundered); | ||
| fprintf(c_file, " if (EQUAL(pszEncoding, \"%s\"))\n", | ||
| encodings[i].name); | ||
| fprintf(c_file, " return &CPL_%s_to_UTF8;\n", | ||
| srcEncodingLaundered); | ||
| } | ||
| fprintf(c_file, " return CPL_NULLPTR;\n"); | ||
| fprintf(c_file, "}\n"); | ||
| fprintf(c_file, "/* clang-format on */\n"); | ||
| fprintf(h_file, "/* clang-format on */\n"); | ||
| fclose(c_file); | ||
| fclose(h_file); | ||
| return 0; | ||
| } |
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