Groundwork for multi codepage support
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Matthew R. Wilson committed
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@@ -8,8 +8,18 @@ import (
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"unicode/utf8"
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)
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// After careful consideration, I have decided that the code page we will
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// support for EBCDIC is IBM CP 1047.
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// Implementations of Charset provide EBCDIC<->UTF-8 translation.
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type Charset interface {
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// Decode converts a slice of EBCDIC bytes into a UTF-8 string.
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Decode(e []byte) string
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// Encode converts a UTF-8 string into a slice of EBCDIC bytes.
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Encode(s string) []byte
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}
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// After careful consideration, I have decided that the default code page we
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// will support for EBCDIC is IBM CP 1047. Other code pages may be globally
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// selected with the SetCodepage() function.
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//
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// In suite3270 (e.g. c3270/x3270), the default code page is what it calls
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// "brackets". This is CP37 with the [, ], Ý, and ¨ characters swapped around.
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@@ -28,54 +38,101 @@ import (
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// In IBM PCOMM, CP37 is the default. For correct mapping of [, ], Ý, ¨, ^,
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// and ¬, you must switch the session parameters from "037 United States" to
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// "1047 United States".
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var currentCodepage Charset = Codepage1047()
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// SetCodepage sets the codepage/character set that go3270 uses. This is a
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// global setting, so if you're expecting clients to be configured to use a
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// character set other than go3270's default, cp1047, you should probably set
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// this during your application initialization and then leave it unchanged
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// after. This is _not_ a per-connection setting.
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func SetCodepage(cs Charset) {
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currentCodepage = cs
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}
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// Internal implementation of the Charset interface we'll use for the codepage
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// support we provide.
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type charset struct {
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// EBCDIC byte to Unicode code point for bytes 0x00-0xFF
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e2u []rune
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// Unicode code point to EBCDIC byte for codepoints 0x00-0xFF
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u2e []byte
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// Map of Unicode code points to EBCDIC bytes for codepoints >0xFF
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highu2e map[rune]byte
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// The EBCDIC substitute character to use if there is no EBCDIC character
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// for the requested Unicode code point (typically 0x3F).
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esub byte
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// The "graphic escape" EBCDIC byte (is it ever anything other than 0x0E?)
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ge byte
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// Graphic escape codepage EBCDIC byte to Unicode code point for bytes
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// 0x00-0xFF. Use rune '�' for unmapped bytes.
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ge2u []rune
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// Map of Unicode code points to graphic escape EBCDIC bytes.
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u2ge map[rune]byte
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}
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// IBM CP 1047 <-> Unicode mappings from:
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// https://raw.githubusercontent.com/unicode-org/icu-data/refs/heads/main/charset/data/ucm/glibc-IBM1047-2.1.2.ucm
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var cp1047ToUnicode = []rune{
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/* x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF */
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/* 0x */ 0x00, 0x01, 0x02, 0x03, 0x9C, 0x09, 0x86, 0x7F, 0x97, 0x8D, 0x8E, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
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/* 1x */ 0x10, 0x11, 0x12, 0x13, 0x9D, 0x85, 0x08, 0x87, 0x18, 0x19, 0x92, 0x8F, 0x1C, 0x1D, 0x1E, 0x1F,
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/* 2x */ 0x80, 0x81, 0x82, 0x83, 0x84, 0x0A, 0x17, 0x1B, 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x05, 0x06, 0x07,
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/* 3x */ 0x90, 0x91, 0x16, 0x93, 0x94, 0x95, 0x96, 0x04, 0x98, 0x99, 0x9A, 0x9B, 0x14, 0x15, 0x9E, 0x1A,
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/* 4x */ 0x20, 0xA0, 0xE2, 0xE4, 0xE0, 0xE1, 0xE3, 0xE5, 0xE7, 0xF1, 0xA2, 0x2E, 0x3C, 0x28, 0x2B, 0x7C,
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/* 5x */ 0x26, 0xE9, 0xEA, 0xEB, 0xE8, 0xED, 0xEE, 0xEF, 0xEC, 0xDF, 0x21, 0x24, 0x2A, 0x29, 0x3B, 0x5E,
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/* 6x */ 0x2D, 0x2F, 0xC2, 0xC4, 0xC0, 0xC1, 0xC3, 0xC5, 0xC7, 0xD1, 0xA6, 0x2C, 0x25, 0x5F, 0x3E, 0x3F,
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/* 7x */ 0xF8, 0xC9, 0xCA, 0xCB, 0xC8, 0xCD, 0xCE, 0xCF, 0xCC, 0x60, 0x3A, 0x23, 0x40, 0x27, 0x3D, 0x22,
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/* 8x */ 0xD8, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0xAB, 0xBB, 0xF0, 0xFD, 0xFE, 0xB1,
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/* 9x */ 0xB0, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, 0x72, 0xAA, 0xBA, 0xE6, 0xB8, 0xC6, 0xA4,
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/* Ax */ 0xB5, 0x7E, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0xA1, 0xBF, 0xD0, 0x5B, 0xDE, 0xAE,
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/* Bx */ 0xAC, 0xA3, 0xA5, 0xB7, 0xA9, 0xA7, 0xB6, 0xBC, 0xBD, 0xBE, 0xDD, 0xA8, 0xAF, 0x5D, 0xB4, 0xD7,
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/* Cx */ 0x7B, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0xAD, 0xF4, 0xF6, 0xF2, 0xF3, 0xF5,
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/* Dx */ 0x7D, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50, 0x51, 0x52, 0xB9, 0xFB, 0xFC, 0xF9, 0xFA, 0xFF,
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/* Ex */ 0x5C, 0xF7, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0xB2, 0xD4, 0xD6, 0xD2, 0xD3, 0xD5,
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/* Fx */ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0xB3, 0xDB, 0xDC, 0xD9, 0xDA, 0x9F,
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func Codepage1047() Charset {
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return &charset{
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e2u: []rune{
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/* x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF */
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/* 0x */ 0x00, 0x01, 0x02, 0x03, 0x9C, 0x09, 0x86, 0x7F, 0x97, 0x8D, 0x8E, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
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/* 1x */ 0x10, 0x11, 0x12, 0x13, 0x9D, 0x85, 0x08, 0x87, 0x18, 0x19, 0x92, 0x8F, 0x1C, 0x1D, 0x1E, 0x1F,
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/* 2x */ 0x80, 0x81, 0x82, 0x83, 0x84, 0x0A, 0x17, 0x1B, 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x05, 0x06, 0x07,
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/* 3x */ 0x90, 0x91, 0x16, 0x93, 0x94, 0x95, 0x96, 0x04, 0x98, 0x99, 0x9A, 0x9B, 0x14, 0x15, 0x9E, 0x1A,
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/* 4x */ 0x20, 0xA0, 0xE2, 0xE4, 0xE0, 0xE1, 0xE3, 0xE5, 0xE7, 0xF1, 0xA2, 0x2E, 0x3C, 0x28, 0x2B, 0x7C,
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/* 5x */ 0x26, 0xE9, 0xEA, 0xEB, 0xE8, 0xED, 0xEE, 0xEF, 0xEC, 0xDF, 0x21, 0x24, 0x2A, 0x29, 0x3B, 0x5E,
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/* 6x */ 0x2D, 0x2F, 0xC2, 0xC4, 0xC0, 0xC1, 0xC3, 0xC5, 0xC7, 0xD1, 0xA6, 0x2C, 0x25, 0x5F, 0x3E, 0x3F,
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/* 7x */ 0xF8, 0xC9, 0xCA, 0xCB, 0xC8, 0xCD, 0xCE, 0xCF, 0xCC, 0x60, 0x3A, 0x23, 0x40, 0x27, 0x3D, 0x22,
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/* 8x */ 0xD8, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0xAB, 0xBB, 0xF0, 0xFD, 0xFE, 0xB1,
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/* 9x */ 0xB0, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, 0x72, 0xAA, 0xBA, 0xE6, 0xB8, 0xC6, 0xA4,
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/* Ax */ 0xB5, 0x7E, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0xA1, 0xBF, 0xD0, 0x5B, 0xDE, 0xAE,
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/* Bx */ 0xAC, 0xA3, 0xA5, 0xB7, 0xA9, 0xA7, 0xB6, 0xBC, 0xBD, 0xBE, 0xDD, 0xA8, 0xAF, 0x5D, 0xB4, 0xD7,
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/* Cx */ 0x7B, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0xAD, 0xF4, 0xF6, 0xF2, 0xF3, 0xF5,
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/* Dx */ 0x7D, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50, 0x51, 0x52, 0xB9, 0xFB, 0xFC, 0xF9, 0xFA, 0xFF,
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/* Ex */ 0x5C, 0xF7, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0xB2, 0xD4, 0xD6, 0xD2, 0xD3, 0xD5,
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/* Fx */ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0xB3, 0xDB, 0xDC, 0xD9, 0xDA, 0x9F,
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},
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u2e: []byte{
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/* x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF */
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/* 0x */ 0x00, 0x01, 0x02, 0x03, 0x37, 0x2D, 0x2E, 0x2F, 0x16, 0x05, 0x25, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
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/* 1x */ 0x10, 0x11, 0x12, 0x13, 0x3C, 0x3D, 0x32, 0x26, 0x18, 0x19, 0x3F, 0x27, 0x1C, 0x1D, 0x1E, 0x1F,
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/* 2x */ 0x40, 0x5A, 0x7F, 0x7B, 0x5B, 0x6C, 0x50, 0x7D, 0x4D, 0x5D, 0x5C, 0x4E, 0x6B, 0x60, 0x4B, 0x61,
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/* 3x */ 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0x7A, 0x5E, 0x4C, 0x7E, 0x6E, 0x6F,
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/* 4x */ 0x7C, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6,
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/* 5x */ 0xD7, 0xD8, 0xD9, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xAD, 0xE0, 0xBD, 0x5F, 0x6D,
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/* 6x */ 0x79, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96,
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/* 7x */ 0x97, 0x98, 0x99, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, 0xA9, 0xC0, 0x4F, 0xD0, 0xA1, 0x07,
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/* 8x */ 0x20, 0x21, 0x22, 0x23, 0x24, 0x15, 0x06, 0x17, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x09, 0x0A, 0x1B,
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/* 9x */ 0x30, 0x31, 0x1A, 0x33, 0x34, 0x35, 0x36, 0x08, 0x38, 0x39, 0x3A, 0x3B, 0x04, 0x14, 0x3E, 0xFF,
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/* Ax */ 0x41, 0xAA, 0x4A, 0xB1, 0x9F, 0xB2, 0x6A, 0xB5, 0xBB, 0xB4, 0x9A, 0x8A, 0xB0, 0xCA, 0xAF, 0xBC,
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/* Bx */ 0x90, 0x8F, 0xEA, 0xFA, 0xBE, 0xA0, 0xB6, 0xB3, 0x9D, 0xDA, 0x9B, 0x8B, 0xB7, 0xB8, 0xB9, 0xAB,
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/* Cx */ 0x64, 0x65, 0x62, 0x66, 0x63, 0x67, 0x9E, 0x68, 0x74, 0x71, 0x72, 0x73, 0x78, 0x75, 0x76, 0x77,
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/* Dx */ 0xAC, 0x69, 0xED, 0xEE, 0xEB, 0xEF, 0xEC, 0xBF, 0x80, 0xFD, 0xFE, 0xFB, 0xFC, 0xBA, 0xAE, 0x59,
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/* Ex */ 0x44, 0x45, 0x42, 0x46, 0x43, 0x47, 0x9C, 0x48, 0x54, 0x51, 0x52, 0x53, 0x58, 0x55, 0x56, 0x57,
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/* Fx */ 0x8C, 0x49, 0xCD, 0xCE, 0xCB, 0xCF, 0xCC, 0xE1, 0x70, 0xDD, 0xDE, 0xDB, 0xDC, 0x8D, 0x8E, 0xDF,
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},
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highu2e: map[rune]byte{},
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esub: 0x3f,
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ge: 0x08,
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ge2u: cp310ToUnicode,
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u2ge: unicodeToCP310,
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}
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}
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var unicodeToCP1047 = []byte{
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/* x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF */
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/* 0x */ 0x00, 0x01, 0x02, 0x03, 0x37, 0x2D, 0x2E, 0x2F, 0x16, 0x05, 0x25, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
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/* 1x */ 0x10, 0x11, 0x12, 0x13, 0x3C, 0x3D, 0x32, 0x26, 0x18, 0x19, 0x3F, 0x27, 0x1C, 0x1D, 0x1E, 0x1F,
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/* 2x */ 0x40, 0x5A, 0x7F, 0x7B, 0x5B, 0x6C, 0x50, 0x7D, 0x4D, 0x5D, 0x5C, 0x4E, 0x6B, 0x60, 0x4B, 0x61,
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/* 3x */ 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0x7A, 0x5E, 0x4C, 0x7E, 0x6E, 0x6F,
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/* 4x */ 0x7C, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6,
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/* 5x */ 0xD7, 0xD8, 0xD9, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xAD, 0xE0, 0xBD, 0x5F, 0x6D,
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/* 6x */ 0x79, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96,
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/* 7x */ 0x97, 0x98, 0x99, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, 0xA9, 0xC0, 0x4F, 0xD0, 0xA1, 0x07,
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/* 8x */ 0x20, 0x21, 0x22, 0x23, 0x24, 0x15, 0x06, 0x17, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x09, 0x0A, 0x1B,
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/* 9x */ 0x30, 0x31, 0x1A, 0x33, 0x34, 0x35, 0x36, 0x08, 0x38, 0x39, 0x3A, 0x3B, 0x04, 0x14, 0x3E, 0xFF,
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/* Ax */ 0x41, 0xAA, 0x4A, 0xB1, 0x9F, 0xB2, 0x6A, 0xB5, 0xBB, 0xB4, 0x9A, 0x8A, 0xB0, 0xCA, 0xAF, 0xBC,
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/* Bx */ 0x90, 0x8F, 0xEA, 0xFA, 0xBE, 0xA0, 0xB6, 0xB3, 0x9D, 0xDA, 0x9B, 0x8B, 0xB7, 0xB8, 0xB9, 0xAB,
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/* Cx */ 0x64, 0x65, 0x62, 0x66, 0x63, 0x67, 0x9E, 0x68, 0x74, 0x71, 0x72, 0x73, 0x78, 0x75, 0x76, 0x77,
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/* Dx */ 0xAC, 0x69, 0xED, 0xEE, 0xEB, 0xEF, 0xEC, 0xBF, 0x80, 0xFD, 0xFE, 0xFB, 0xFC, 0xBA, 0xAE, 0x59,
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/* Ex */ 0x44, 0x45, 0x42, 0x46, 0x43, 0x47, 0x9C, 0x48, 0x54, 0x51, 0x52, 0x53, 0x58, 0x55, 0x56, 0x57,
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/* Fx */ 0x8C, 0x49, 0xCD, 0xCE, 0xCB, 0xCF, 0xCC, 0xE1, 0x70, 0xDD, 0xDE, 0xDB, 0xDC, 0x8D, 0x8E, 0xDF,
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}
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// Furthermore, certain characters are supported in the "graphic escape"
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// CP310. These are arbitrary Unicode code points, so we will look them up via
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// a map. For simplicity of our mapping implementation, we will not support the
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// italic underlined A-Z characters that require combining characters.
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// Certain characters are supported in the "graphic escape" CP310. These are
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// arbitrary Unicode code points, so we will look them up via a map. For
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// simplicity of our mapping implementation, we will not support the italic
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// underlined A-Z characters that require combining characters.
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//
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// We will share this map among all of the codepages that we provide
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// implementations for.
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//
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// https://public.dhe.ibm.com/software/globalization/gcoc/attachments/CP00310.pdf
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var unicodeToCP310 = map[rune]byte{
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@@ -127,25 +184,25 @@ var cp310ToUnicode = []rune{
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// decode will convert a CP1047 byte array into a UTF-8 Go string, handling
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// graphic escape to CP310.
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func decode(b []byte) string {
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func (cp *charset) Decode(b []byte) string {
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runes := make([]rune, 0, len(b))
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var escape bool
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for i := range b {
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if escape {
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escape = false
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if cp310ToUnicode[b[i]] != '�' {
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runes = append(runes, cp310ToUnicode[b[i]])
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if cp.ge2u[b[i]] != '�' {
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runes = append(runes, cp.ge2u[b[i]])
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} else {
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runes = append(runes, 0x1A) // Unicode substitute
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}
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} else {
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// Enter graphic escape mode if necessary.
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if b[i] == 0x08 {
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if b[i] == cp.ge {
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escape = true
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continue
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}
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// Otherwise perform the mapping.
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runes = append(runes, cp1047ToUnicode[b[i]])
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runes = append(runes, cp.e2u[b[i]])
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}
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}
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@@ -153,7 +210,7 @@ func decode(b []byte) string {
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}
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// encode will convert a UTF-8 Go string into a CP1047 byte array.
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func encode(s string) []byte {
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func (cp *charset) Encode(s string) []byte {
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out := make([]byte, 0, len(s))
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for len(s) > 0 {
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@@ -163,14 +220,14 @@ func encode(s string) []byte {
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break
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}
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if int(r) < len(unicodeToCP1047) {
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out = append(out, unicodeToCP1047[r])
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} else if v, ok := unicodeToCP310[r]; ok {
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if int(r) < len(cp.u2e) {
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out = append(out, cp.u2e[r])
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} else if v, ok := cp.u2ge[r]; ok {
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// include graphic escape character to switch to CP310
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out = append(out, 0x08, v)
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out = append(out, cp.ge, v)
|
||||
} else {
|
||||
// replacement/substitute character
|
||||
out = append(out, 0x3f)
|
||||
out = append(out, cp.esub)
|
||||
}
|
||||
s = s[size:]
|
||||
}
|
||||
|
||||
+2
-2
@@ -160,7 +160,7 @@ func readFields(c net.Conn, fm fieldmap, cols int) (map[string]string, error) {
|
||||
if eor {
|
||||
// Finish the current field
|
||||
if infield {
|
||||
value := decode(fieldval.Bytes())
|
||||
value := currentCodepage.Decode(fieldval.Bytes())
|
||||
debugf("Field %d: %s\n", fieldpos, value)
|
||||
handleField(fieldpos, value, fm, values)
|
||||
}
|
||||
@@ -172,7 +172,7 @@ func readFields(c net.Conn, fm fieldmap, cols int) (map[string]string, error) {
|
||||
if b == 0x11 {
|
||||
// Finish the previous field, if necessary
|
||||
if infield {
|
||||
value := decode(fieldval.Bytes())
|
||||
value := currentCodepage.Decode(fieldval.Bytes())
|
||||
debugf("Field %d: %s\n", fieldpos, value)
|
||||
handleField(fieldpos, value, fm, values)
|
||||
}
|
||||
|
||||
Reference in new issue
Block a user